ON PETITION FOR WRIT OF MANDAMUS AND PROHIBITION.
BOEHM, Justice.In 2001, the General Assembly passed two statutes that applied only in Lake County and provided for countywide reassessment of property for tax purposes to be conducted by the Department of Local Government Finance and by private contractors selected by the DLGF. The plaintiffs are a group of taxpayers who brought an action in April 2004 in Lake Superior Court seeking a declaratory judgment that these statutes are unconstitutional. The bills for taxes due in 2008 had not yet been mailed due to delays in the reassessment process and the plaintiffs asked that the taxing authorities in that county be enjoined from mailing bills for the property taxes due in 2008.
The trial court found the statutes to violate five separate provisions of the Indiana Constitution and granted the requested preliminary injunction. The At*1244torney General contended that exclusive jurisdiction over this case lies in the Tax Court and on that ground asked this Court for a writ of mandarous and prohibition. While that writ proceeding was pending, an appeal of the preliminary injunction was also initiated. This Court stayed the trial court's preliminary injunction. As a result the taxing authorities were free to mail the bills for taxes due in 2008. We then ordered the writ proceeding and the appeal to be argued concurrently. This opinion addresses both.
We hold that the Lake Superior Court had no jurisdiction to entertain these claims. We recognize that ordinarily lack of jurisdiction of the trial court would preclude deciding any other issues. However, this case presents a challenge to the entire assessment process in Indiana's second most populous county. For the reasons explained below, we think it is clear that the plaintiffs will ultimately fail in their effort to enjoin the tax bills produced by the 2002 countywide reassessment. It is not in anyone's interest to preserve false hopes by resolving this appeal on jurisdictional grounds alone. In short, there is broad public interest in a prompt resolution of this case, and the parties ask us to address the merits of the plaintiffs' claims without regard to jurisdiction. For these reasons we do so without delaying a final resolution of this matter.
We conclude that the statutes providing for private parties or the DLGF to assess certain assets in Lake County violate one of the provisions of the Indiana Constitution on which the plaintiffs rely, but not the other four. Although the 2001 laws violated Article IV, Section 22 of the Indiana Constitution as special legislation providing for the assessment of taxes, in 2004 the General Assembly passed a statute authorizing the assessment conducted pursuant to the 2001 legislation. This "curative" legislation validated the acts taken under the unconstitutional special legislation. Moreover, plaintiffs waited until reassessment was completed to seek in-junctive relief. In the meantime, other taxpayers and local government units relied on the ongoing reassessment process provided by statute to supply funding for essential day-to-day functions of government. For that reason as well, plaintiffs' claim for injunction was barred by the delay in seeking equitable relief.
Factual and Procedural Background
In broad brush, the amount of property taxes owed for each individual property is set by allocating the total amount of property taxes to be raised in a taxing district among all pieces of property in proportion to their assessed valuations. If the total to be raised increases, of course the sum of all tax bills in the district goes up by that amount. But, the total amount to be raised is unaffected by a reassessment of property valuations. If all assessed valuations go up or down by the same percentage as the result of a reassessment, even if there is a large change in the dollar amount of the assessed valuation on each property, there is no change in the tax burden of any individual property. In simplified terms, if the assessed valuation of every property doubles, it would have no effect on the tax bills of any of them. If, however, some assessed valuations go up or down more than others, as is always the case in the real world, some taxes go up and some go down, but the gains by those whose assessed valuations go down more than the average are offset by losses among those whose assessed valuations increase more than the average. In other words, reassessment is a zero sum game for all property in the affected area.
As explained in more detail below, Lake County has for several years had a history of uneven assessments and generally lower *1245assessed valuations than those in other parts of the state for similar properties. In response to this situation, the two challenged provisions were enacted by the 2001 session of the General Assembly in the same law, H.B.1902. Both by their terms apply only in counties with populations between 400,000 and 700,000, and Lake County is the single county meeting that criterion. The two statutes now appear as Indiana Code section 6-1.1-4-32 (2004), which authorized the DLGF to employ private firms to assess real property in Lake County, and Indiana Code section 6-1.1-8.5-1 et seq., which provided for the DLGF itself to assess industrial properties in Lake County with an estimated assessed value in excess of $25 million.
Indiana property taxes are due in May and November of each year based on assessed valuations as of March 1 of the preceding year. Both of the challenged statutes provide procedures that formed a part of the process of determining the assessed valuation of property in Lake County as of March 1, 2002. The 2002 reassessment was completed, although later than usual, by a private firm selected by the State Board and by the DLGF. In practical terms, the issue here is that the reassessment resulted in proportionally lower assessed valuations of some large industrial properties in Lake County compared to the changes in assessed valuations of some residential properties, notably those owned by the plaintiffs. As a result, the 2008 taxes increased for the owners of properties whose changes in assessments were proportionally higher. For some properties, these new taxes were dramatically higher than their historic levels. The State points out that if the reassessment is accurate, the increase in taxes compared to prior years merely corrects an underpayment these residential properties have enjoyed in the past. The plaintiffs counter that the effect of increased taxes is to lower the market value of their residential properties because most homes are purchased based on the monthly cash payments required for principal and interest on a mortgage plus taxes and insurance. An increase in taxes means a potential purchaser has less available for monthly mortgage payments and therefore produces a reduced market value of the property.
Article IV, Section 22 of the Indiana Constitution prohibits "local or special laws" dealing with a number of subject matters, one of which is "providing for the assessment and collection of taxes...." Article IV, Section 23 provides that even if a law does not address one of the Section 22 items, it nevertheless must be a general law "where a general law can be made applicable." Finally, Article X, Section 1 directs the General Assembly to "provide, by law, for a uniform and equal rate of property assessment and taxation...." Plaintiffs brought this action in Lake Superior Court, contending that these two statutes violate each of these three provisions, and two others as well. For that reason they claim that the collection of the 2003 property taxes in Lake County must be enjoined. The State responds that the trial court lacks jurisdiction over this case. The State also contends that the statutes are constitutional, and in any event the resulting assessed valuations are correct, so there is no point in redoing the assessment by some other agency that would, after some extended time, arrive at the same results, and in the meantime severely interfere with the day-to-day operation of local government in Lake County.
After a hearing in which no testimony was taken, the trial court granted a preliminary injunction. The State first asked this Court, pursuant to Original Action Rule 1(A), for a writ of mandamus and prohibition, contending that the trial court *1246lacked jurisdiction based on the plaintiffs' failure to exhaust administrative remedies. The State also initiated an appeal of the preliminary injunction pursuant to Appellate Rule 14(A)(5). Because the preliminary injunction was based on a holding that a statute was unconstitutional, the appeal also is directly to this Court. App. R. 4(A)(1)(b). We granted the State's request for a stay of the trial court's preliminary injunction, permitting the tax bills to be mailed. We then consolidated the argument on the two proceedings and now address both in this opinion.
The parties do not dispute the underlying facts. The issues relating to the jurisdiction of the trial court and the merits present only questions of law.
I. Jurisdiction of the Trial Court
Plaintiffs brought this suit contending their properties were incorrectly assessed and therefore their soon-to-be mailed tax bills were too high. The statute creating the Tax Court provides that that court has "exclusive jurisdiction over any case that arises under the tax law of this state and that is an initial appeal of a final determination" of the Indiana Board of Tax Review. Ind.Code § 838-3-5-2 (2008).1 Other statutes provide in some detail the procedure for contesting an assessment of property. These include an appeal from county determinations to the Board, and a provision in Indiana Code section 6-1.1-15-5(b) for review of challenges to assessments by the Tax Court "under I.C. 4-21.5-5." This refers to the Judicial Review chapter of the Indiana Administrative Orders and Procedures Act which includes Section 4(a) requiring exhaustion of administrative remedies before judicial review may be initiated. In State v. Sproles, 672 N.E.2d 1353, 1357 (Ind.1996), we held that a taxpayer wishing to contest a tax must first exhaust administrative remedies, and that these statutes collectively deprive the other trial courts of this state of jurisdiction over any case that "principally involves collection of a tax or defenses to that collection." As explained in Lake County Property Tax Assessment Board of Appeals v. BP Amoco Corp., 820 N.E.2d 1231, 2005 WL 67440 (No. 49S10-0309-TA-00400) (Ind. Jan. 13 2005), handed down today, a challenge of the sort plaintiffs bring in this case is properly presented in the first instance to the Indiana Board of Tax Review. According ly, judicial review lies exclusively in the Tax Court. See also State Bd. of Tax Comm'rs v. Mixmill Mfg. Co., 702 N.E.2d 7OL, 702 (Ind.1998); Winski Bros. v. Bayh, 679 N.E.2d 912, 915 (Ind.Ct.App. 1997). In 2001, after these decisions, the statutes discussed above were amended to substitute the Board of Review for the State Tax Board as the agency entertaining property tax appeals from local taxing authorities, but the language conferring exclusive jurisdiction on the Tax Court and requiring exhaustion of administrative remedies was preserved without change. Pub.L. No. 198-2001, § 98, 2001-2 Ind. Acts 12983, 1407. We perceive no legislative dissatisfaction with the construction of that provision we made explicit in Sproles, and find it controlling here. Indiana Board of Tax Review. According ly, judicial review lies exclusively in the Tax Court. See also State Bd. of Tax Comm'rs v. Mixmill Mfg. Co., 702 N.E.2d 701, 702 (Ind.1998); Winski Bros. v. Bayh, 679 N.E.2d 912, 915 (Ind.Ct.App. 1997). In 2001, after these decisions, the statutes discussed above were amended to substitute the Board of Review for the State Tax Board as the agency entertaining property tax appeals from local taxing authorities, but the language conferring exclusive jurisdiction on the Tax Court and requiring exhaustion of administrative remedies was preserved without change. Pub.L. No. 198-2001, § 98, 2001-2 Ind. Acts 1293, 1407. We perceive no legislative dissatisfaction with the construction of that provision we made explicit in Sproles, and find it controlling here.
Plaintiffs contend that the Lake Superi- or Court, as a court of general jurisdiction, has jurisdiction "over the constitutionality of these statutes." Precisely the same claim was advanced and rejected in Sproles, 672 N.E.2d at 1357. That case involved a claim, asserted in a court of general jurisdiction, that a tax could not be collected because the constitution prevent*1247ed its collection. The claim in Sproles was that the constitutional ban on double jeopardy prevented collection of the Controlled Substance Excise Tax where the taxpayer had been convicted of a crime for possession of the same marijuana that was the subject of the tax. We held that such a case "arises under" the tax laws and therefore must be brought in the Tax Court after exhaustion of administrative remedies. /d. at 1861. The sole relief the plaintiffs seek here is an injunction against the collection of property taxes, and their claim is that the assessed valuations of Lake County property are invalid because the assessment was done pursuant to unconstitutional statutes. These constitutional issues are asserted as the basis of defense to the collection of the property taxes. Just as Mr. Sproles did, Plaintiffs here seek to bring their claim in a court of general jurisdiction to enjoin collection of a tax.
The trial court concluded that this case involves assessments, not taxation, and therefore Sproles was inapplicable. As already noted, the statute governing challenges to assessments, I.C. § 6-1.1-15-5 (2004), expressly incorporates the exhaustion requirement as to challenges to assessments. Assessments, just as other challenges to a tax, are routed through the Board of Tax Review, and we see no distinction for these purposes between a challenge to assessments, whether procedural or substantive, and any other basis to contest a tax.
We are equally unpersuaded by Plaintiffs' suggestion that it makes a difference that the tax in Sproles was a "listed tax" regulated by the Department of Revenue, rather than the property tax administered through the Board of Tax Review. The same statutory language imposes jurisdictional restrictions on both types of tax. Both are subject to the same requirement of exhaustion of administrative remedies and both are subject to the exclusive jurisdiction of the Tax Court by the same language in Indiana Code section 83-3-5-2(a) (2008), which applies that language to both listed taxes in subsection (a)(1) and to property taxes in subsection (a)(2).
In summary, the question whether the Tax Court jurisdiction is exclusive is purely a matter of legislative intent. In 1996, we held that the purpose of the 1986 legislation creating the Tax Court was to consolidate tax litigation in one forum, and deprive the courts in various locations around the State of jurisdiction to address these issues. Sproles, 672 N.E.2d at 1357. Despite his claim that resort to his administrative remedy was futile, Sproles was required to exhaust administrative remedies and present his constitutional claims to the Tax Court. Id. at 1361. That result is dictated by the General Assembly, and the same statutes govern the plaintiffs' claim here.
II. The Merits of Plaintiffs' Claims
Failure to exhaust administrative remedies is a defect in subject matter jurisdiction. M-Plan, Inc. v. Ind. Comprehensive Health Ins. Ass'n, 809 N.E.2d 834, 837 (Ind.2004) (citing Austin Lakes Joint Venture v. Avon Utils. Inc., 648 N.E.2d 641, 644 (Ind.1995)). Accordingly, the trial court was without jurisdiction to entertain this claim, and a writ of prohibition is properly requested. State v. Allen Superior Court, 699 N.E.2d 1134, 1135 (Ind. 1998). Plaintiffs request us to address the merits of their contentions, even if the trial court lacked jurisdiction. We agree we should do so. The issues have been fully briefed by the parties and by the interve-nors, and a resolution of the merits of these contentions is in the public interest.
A. Special Legislation Under Article IV of the Indiana Constitution
Both Section 22 and Section 28 of Article IV of the Indiana Constitution prohibit *1248"special" legislation under some circumstances. Plaintiffs contend that the statutes providing for DLGF to assess industrial property and for private contractors to be hired to assess residential property are local or special legislation as that term is used in both sections. We agree that these laws are "special" for purposes of Article IV. The statutes authorizing the 2002 reassessments by their terms applied only in counties of population between 400,000 and 700,000, and Lake County is the only such county. To be sure, some statutes applicable only to areas with specified populations may be justifiable as special legislation, because the parameters rationally relate to the subject matter of the legislation. They may also be viewed as "general legislation" if the subject matter is one that is rationally related to population, such as the basic structure of local government. So, as we observed in City of South Bend v. Kimsey, 781 N.E.2d 683, 694 (Ind.2003), the Unigov statute, which applies only to counties with cities of the first class, and therefore only to counties with cities of certain size, may properly be viewed as a general law even if it applies in practice in only one place. By hooking the defining characteristic (in Unigov a city of the first class) to the justifying characteristic (rational desire for more expansive and encompassing form of metropolitan government), legislation applicable in only one county may over time become applicable in others. Here however, the apparent reasons for limiting the application of the statutes in question are not related to population. Rather, they plainly derive from the troubled history of property taxation in Lake County discussed below. Thus, the rationale for population-based statutes relating to the organization of local government do not apply here, and the law, applicable only in Lake County, is "special" legislation whether it describes Lake County by name, by population parameters, or by some other unique characteristic. Id. at 692.
1. Local laws providing for the assessment and collection of taxes
Article IV, Section 22 provides a list of subjects as to which "local or special laws" are prohibited. Among these are laws "providing for the assessment and collection of taxes...." The State argues that Section 22 does not apply to the statutes in question here because the Section is written in the conjunctive, prohibiting local laws that "provide for the assessment and collection of taxes." Because there is no "collection" aspect to these laws, the State contends Section 22 is inapplicable. We do not agree. The constitutional debates make clear that lack of uniform assessment practices was one of the principal concerns underlying both Article X, Seetion 1, and Article IV, Section 22. Seq, eg., Report of the Debates and Proceedings of the Convention for the Revision of the Constitution of the State of Indiana, Vol. II at 1290 (1850), where Douglass Maguire, a delegate from Marion County, finding "great inequality in the assessment and taxation of property," called for checks upon county assessors through a Board of Equalization to value all real property on an equal basis. Although "and" is normally taken as conjunctive, it may be read as disjunctive if the context makes clear that is the legislative intent. See, e.g., State v. Myers, 146 Ind. 36, 38, 44 N.E. 801, 801-02 (1896); Brook v. State, 448 N.E.2d 1249, 1251 (Ind.Ct.App.1983).
We think the history of Section 22 makes clear that it was addressed to local laws dealing with either assessment of property or collection of taxes, or both. Section 22 had no counterpart in the 1816 Constitution and appeared for the first time in the Indiana Constitution as a result of the 1851 Constitutional Convention. It *1249was the product of widespread dissatisfaction with the large number of laws passed by the legislature in the early days of this State dealing with purely local subjects. Many of these imposed or authorized local taxes for specific projects, typically roads or schools. Others addressed a variety of other special and local interests, even granting divorces.
To "assess" property is to value it. Merriam Webster's Collegiate Dictionary 69 (10th ed.1993). To "assess" a tax is to impose it. Id. Thus, as a matter of syntax, Section 22's reference to laws "providing for the assessment and collection of taxes" may be read to deal only with laws passed for the imposition or collection of taxes, and not the valuation of property for tax purposes. However, in State v. Hoovler, 668 N.E.2d 1229 (Ind.1996), we addressed a claim that Section 22 prohibited a statute raising the maximum local county option income tax rate to 1 .25% in Tippecanoe County from the 0.7% rate applicable statewide. The effect was to permit county authorities to adopt an additional 0.55% local income tax. After a review of the historical roots of Section 22, this Court held that this statute, though a local law, did not violate Section 22 because it did not "authorize any new property valuations or changes in the system of tax gathering." Id. at 1233. The authorization of an increase in the rate of an existing tax was not the "assessment and collection" of a tax. Indeed, we specifically referred to a dictionary of the time, noting that "assessment" includes "valuation of property ... for purpose of taxation." Id. Hoovier thus made clear that local laws dealing with assessment of property for tax purposes were prohibited by Section 22. This is of course consistent with the history of Section 22, as variations in assessment procedures were the most frequently cited reasons for the need for constitutional limits on local legislation. Accordingly, we agree with plaintiffs that these provisions constitute special legislation "providing for the assessment and collection of taxes," and therefore violate Article IV, Section 22 of the Indiana Constitution. For the reasons explained in Parts III and IV, however, the reassessments conducted under these statutes are not invalid by reason of this flaw in the statutes.
2. Special laws under Article IV, Section 23
Plaintiffs contend these laws also violate Article IV, Section 283, which requires that "where a general law can be made applicable, all laws shall be general, and of uniform operation throughout the State." As we held in Kimsey, under Seetion 23, a law limited to a given county is prohibited unless "there are inherent characteristics of the affected locale that justify local legislation." Kimsey, 781 N.E.2d at 692. If the affected county reflects unique cireumstances that rationally justify the legislation, then a general law is not "applicable" elsewhere and Section 23 is not violated. Id.
The State points to the long and tortured history of property taxation in Lake County, described in Matonovich v. State Bd. of Tax Comm'rs, 705 N.E.2d 1093, 1095 (Ind. Tax Ct.1999) as "an endemic problem with the uniformity of assessments within classes of property." As explained above, if some parts of a county significantly underassess properties compared to the assessed valuations placed on similar properties elsewhere, the effect is to shift tax burdens from the underas-sessed properties. Indeed, that was the complaint of the town of St. John, which is in Lake County, that led to the initial holding that the then-prevailing "true tax value" system of assessment did not produce a uniform and equal method of as*1250sessment in violation of Article X, Section 1 of the Indiana Constitution. Boehm v. Town of St. John, 675 N.E.2d 318, 324 (Ind.1996).
Until 2001, the State Tax Board had the functions of both the Board of Tax Review and the DLGF. In 1998, the State Board had concluded, after public hearings, that widespread underassessment in various units of Lake County required ordering a countywide reassessment, and had employed a private contractor to reassess all property in Lake County. Though noting the State Board's finding that there was "a widespread recognition that an assessment problem exists in Lake County," the Tax Court concluded that the Board had no authority to employ a private firm to perform the reassessment. Matonovich, 705 N.E.2d at 1098. In response to that decision, the General Assembly promptly granted the Board the authority the Tax Court found lacking by enacting the statutes Plaintiffs challenge in this case. We thus have administrative findings, judicial findings, and legislative action all pointing to a unique cireumstance created by uneven assessment practices in various parts of Lake County. And, as Plaintiffs point out, a few huge industrial complexes in Lake County constitute significant percentages of all taxable property in some taxing districts, a situation not faced in any other county, and requiring great care in valuing such a dominant asset of unique kind and character for which there is no ready market comparable. to that for residential housing. We are directed to no comparable set of cireum-stances in any other county producing such widespread tax inequities and unusual issues of valuation. These conditions readily justify local legislation to deal with a reassessment problem of a seale and complexity not found elsewhere in the state.
B. Other Constitutional Challenges
Plaintiffs contend without much explanation that these statutes violate Article X, Section 1 of the Indiana Constitution. That section requires a "uniform and equal rate of property assessment and taxation." We have held that the system of property taxation must be based on a system that causes "each taxpayer's property wealth bear its proportion of the overall property tax burden." Town of St. John, 675 N.E.2d at 324. There is no basis to conclude that the statutes in question produce a disproportionate assessment. Different procedures to accomplish a reassessment based on the same substantive rules of valuation do not violate that provision. Indeed, this Court has held that the goal of statewide uniformity and proportionality trumps a local government's authority to value property. Zoercher v. Agler, 202 Ind. 214, 225-26, 172 N.E. 186, 190-91 (1930). The end result-a "uniform and equal rate" of assessment-is required, but there is no requirement of uniform procedures to arrive at that rate. To the contrary, the power of local authorities to implement tax laws is purely statutory in nature. The only constitutional constraint under Article X, Section 1 is upon the State itself, which must provide a uniform and equal rate of assessment, but may provide whatever procedures are appropriate consistent with the other provisions of the Constitution.
For the same reason that these statutes do not violate Article IV, Section 283, they also do not violate Article I, Seetion 28, which requires that legislative classifications be reasonably related to inherent characteristics that define the class. Plaintiffs do not elaborate on these claims and we are left to surmise what the classification may be. Taking the complaint at face value, the class appears to be Lake County taxpayers compared to those in all *1251other counties. As explained above, given the long history of systematic underassessment in parts of Lake County, there is abundant reason to provide for reassessment of property in that county by means different from those applied in other counties. The statutes thus satisfy the first prong of the requirements of Article I, Section 28. The separate treatment of Lake County is "reasonably related" to its "distinguishing characteristics." Collins v. Day, 644 N.E.2d 72, 80 (Ind.1994).
Plaintiffs also advance an argument, not clearly tied to any specific constitutional provision, the substance of which is that local assessors would recognize the adverse effect that lowering valuations of industrial properties would have on some residential properties. This is compounded, plaintiffs say, by the fact that this reassessment was performed by two different agencies, private contractors for residential properties and DLGF for industrial property. They claim a constitutional right to have locally elected officials perform the assessments. There are several things wrong with this claim. First, valuations, whether made by local authorities or by others, are as of March 1 of a given year. Any shift in valuations caused by tax bills in the future is a matter for future reassessments. Second, this argument boils down to a claim that these plaintiffs have a right to preferential treatment under the property tax laws. That is precisely the contention rejected by other taxpayers, including the residents of St. John, who felt disadvantaged by selective underassessments in parts of Lake County and claimed those disparities violated their rights to uniform and equal taxation. Without a showing that the substantive results reached by the reassessments are incorrect, we will not indulge the assumption that local officials would arrive at a different result. Finally, there is nothing in the Constitution that guarantees an assessment by locally elected officials. The clerk of the cireuit court, auditor, recorder, treasurer, sheriff, coroner, and surveyor are required by Article VI, Section 2 to be "elected, in each county." There is no such requirement as to assessors. Indeed, at some points in the history of this state the disparities created by local assessors responding to local election pressures created demand for a statewide equalization board to eliminate the resulting unfairness. Justin E. Walsh, The Centennial History of the Indiana General Assembly 1816-1978, 102-04 (1987).
Plaintiffs' claim that these statutes violate Article I, Section 21 against "taking" of property without compensation is frivolous. -It is well established that taxation is not a "taking" within the meaning of this provision. Hutchins v. Town of Fremont, 194 Ind. 74, 83, 142 N.E. 3, 6 (1924); Bd. of Comm'rs of Jackson v. State, 147 Ind. 476, 492, 46 N.E. 908, 912 (1897); 5A Ind. Law Encyclopedia, Constitutional Law § 446, at 427 (1984). The properties remain in the hands of the owners, and their use is unaffected by the reassessment.
Finally, Plaintiffs advance a number of arguments questioning the wisdom of the legislation, but raise no constitutional issue. For example, they claim that local authorities should be given the opportunity to perform the assessments. They also question the lack of taxpayer awareness of the effect of reassessment based on the fact that many homes are mortgaged and the mortgagees, as escrow agents, receive the tax notices. These claims present no legal issue. The policy arguments must be directed to the General Assembly, not this Court. Plaintiffs' other claims, such as the unconstitutionality of the homestead tax credit, were not presented to the trial court and are not available on appeal..
*1252III. The 2004 Law as Curative Legislation ©
A general law could readily have been crafted in 2001 that would have accomplished what the General Assembly attempted to do. As explained in Part II. A.2, Lake County has a long and troubled history of assessment of property, including findings of the State Board as early as 1998 that systematic underassessment required a countywide reassessment. A statute applicable to all counties permitting the use of contracted private assessors or permitting the DLGF to perform that function where such a finding is made would be a general law not subject to Article IV challenge as special legislation. In 2004 such a law was passed.
Indiana Code section 6-1.1-4-85 (2004), applies by its terms to a county "other than a county subject to section 32 [I.C. § 6-1.1-4-32]." At the time this law was passed, presumably the intent of this exception was to exclude Lake: County, which, as explained in Part II, is the only county that meets the population parameters of "section 82." Because section 32 violates Article IV, Section 22, however, no county is "subject to section 82" and seetion 35 applies by its terms to Lake County and all ninety-one other counties. Moreover, section 835(v) specifically. provides that "the provision of this section are severable as provided in .C. § 1-1-1-8(b) [the general severability statute]." Pursuant to Section 35(v), we are to sever any invalid portions of section 35. If section 35 were inapplicable in Lake County, it would constitute special legislation for the same reasons section 32 runs afoul of Article IV, Section 22 of the Indiana Constitution. Based on the effort in 2001 to accomplish essentially the same thing for Lake County, we think it clear that the General Assembly would prefer statewide application of section 35 to its statewide invalidity. Accordingly, even if section 35 is read to exclude Lake County, that exclusion would fall, for the purpose of preserving the statute.
Section 35 provides for DLGF to order a State-conducted reassessment for a county if it determines that the local officials are unable to complete the reassessment by October 2003 or are likely to complete reassessment in an "inaccurate manner." The DLGF is authorized to contract with private parties to perform the reassessment. Nothing precludes the DLGF from performing a part of the reassessment itself and contracting for others. The DLGF was thus authorized by the 2004 legislation to do substantially the same things in Lake County that were in fact done under color of section 82. We are unwilling to fortify the armory of those who attack the law as famous for its ability to elevate form over substance. We see no basis to trigger the disruption that would be generated by invalidation of the entire county's property tax base where there is no showing that any identifiable property has been incorrectly assessed. Indeed, what plaintiffs seek is court preservation of a system of taxation that was held invalid six years ago in State Board of Tax Commissioners v. Town of St. John, 702 N.E.2d 1034 (Ind.1998).
The 2004 law acts as curative legislation by authorizing actions taken pursuant to an unconstitutional statute. "A curative act is a statute passed to cure defects in prior law, or to validate legal proceedings, instruments, or acts of public and private administrative authorities. In the absence of such an act the statute would be void for want of conformity with "existing legal requirements.... [A] curative act may validate any past action which the legislature might have authorized beforehand." 2 Norman J. Singer, Statutes and Statutory Construction, § 41.11, at *1253466-67 (6th ed.2001). This Court has adopted Judge Cooley's test for curative acts:
If the thing wanting or which failed to be done, and which constitutes the defect in the proceedings, is something the necessity for which the legislature might have dispensed with by prior statute, then it is not beyond the power of the legislature to dispense with it by subsequent statute. And if the irregularity consists in doing some act, or in the mode or manner of doing some act, which the legislature might have made immaterial by prior law, it is equally competent to make the same immaterial by a subsequent law.
See State ex rel. Harris v. Mutschler, 232 Ind. 580, 590-91, 115 N.E.2d 206, 210 (1953) (citing 2 Thomas M. Cooley, Constitutional Limitations at 775-76 (7th ed.)). A curative act should be liberally construed. Mutschler, 232 Ind. at 591, 115 N.E.2d at 210. A curative or validating statute is a species of retrospective legislation, "but that does not make such a curative act unconstitutional unless violating some constitutional provision such as impairing the obligation of a contract or the taking of property without due process." Martin v. Ben Davis Conservancy Dist., 238 Ind. 502, 512, 153 N.E.2d 125, 130 (1958); See Muncie Nat'l Bank v. Miller, 91 Ind. 441, 446 (1883). Therefore, when passing curative legislation the legislature may recognize and validate a de facto condition or status. There are limitations to this doctrine. For example the legislature cannot authorize an unconstitutional act, Martin, 238 Ind. at 513, 153 N.E.2d at 130, or cure a jurisdictional defect in a court proceeding, Seitz v. Mosier, 192 Ind. 416, 421-22, 136 N.E. 840, 842 (1922). But none are applicable here. The legislature plainly could have authorized statewide reassessments under the procedures of section 35.
The relevant point here is that the legislature may pass curative legislation that validates official acts performed pursuant to an act which a court later determines is unconstitutional so long as the curative statute does not suffer from any of the same defects as the original law. Thus, in Martin, the 1947 legislature passed an act that gave trial courts the authority to establish conservancy districts and appoint their directors and appraisers. Subsequently, the Court held that the 1947 law violated the requirement, since removed from Article IV, Section 19 of the Indiana Constitution, that the subject of every act "shall be expressed in the title." State ex rel. Pa. R.R. Co. v. Iroquois Conservancy Dist. Court, 235 Ind. 353, 359, 133 N.E.2d 848, 851 (1956). In response, the legislature passed the Conservancy Act of 1957 which by its terms authorized the conser-vancey districts established pursuant to the 1947 act and legalized prior acts of the board of directors for those districts. This Court held that because it was within the legislature's prerogative to establish the conservancy districts in 1947, it was also within the power of the General Assembly to cure any constitutional defects by passing curative legislation that meets constitutional requirements. Martin, 238 Ind. at 512, 153 N.E.2d at 130. Similarly, this Court in Mutschler, 232 Ind. at 591, 115 N.E.2d at 210, upheld a general law that legalized consolidated school districts that were defectively formed due to improper notice or invalid elections. It was within the legislature's discretion to dispense with those requirements for consolidation, so it was permissible to validate consolidations that had taken place without them, although they were required at the time the consolidation originally took place. Id.
In Fahlor v. Board of Commissioners of Wells County, 101 Ind. 167, 171-72 (1885), this Court declared that the proceedings *1254and orders of the Wells County board were void because the board was not in a regular or special session when it approved the construction of a road. The next year, however, in Johnson v. Board of Commissioners of Wells County, 107 Ind. 15, 26 8 N.E. 1, 6 (1886), this Court upheld legislation passed one month after the decision in Fahnlor, to legalize the proceedings of the county board as to the gravel road. The Court held that curative legislation is invalid if it "materially interferes with or overthrows vested rights, creates and imposes new burdens, or infringes upon the judicial department of the government." Johnson, 107 Ind. at 19, 8 N.E. at 5-6; see also 5A Ind. Law Encyclopedia, Constitutional Law § 272, at 188 (1984). But in the absence of any of these, a curative law salvages actions taken under defective statutes or in disregard of procedural requirements that are not required by due process. This reasoning has been specifically followed by the United States Supreme Court in sustaining curative laws authorizing assessments for tax purposes. In Williams v. Supervisors of Albany, 122 U.S. 154, 164, 7 S.Ct. 1244, 30 L.Ed. 1088 (1887), the Court stated: "It is only necessary ... to consider whether the assessment could have been ordered originally.... If [the statutory flaws] were not essential to any valid assessment, and therefore might have been omitted or performed at another time, their omission or defective performance may be cured by the same authority." And curative legislation has been specifically upheld to validate acts taken pursuant to laws later held to be special legislation. See Marfa Indep. Sch. Dist. v. S.T. Wood, 185 Tex. 223, 141 S.W.2d 590, 592 (1940).
In sum, in 2004 the Legislature authorized the DLGF to contract with private parties to perform property value reassessments or to conduct reassessments itself in counties where DLGF determines that local officials are unable to complete the reassessment by October 2003 or are likely to complete reassessment in an "inaccurate manner." The DLGF did find widespread unequal assessment practices in Lake County, and pursuant to section 32 the county's property values were reassessed. The legislature had the power to authorize the DLGF to order the reassessment of property values in Lake County at the time it passed seetion 32. It therefore also had the power to cure the constitutional defect of the act by enacting section 35. Accordingly, the 2002 reassessment is valid subject to any individual errors in assessment that are determined in the normal review process.
The doctrine of curative legislation permits the legislature in effect to ratify a previously unauthorized reassessment. This produces no injustice. There are unconstitutional statutes and unconstitutional statutes. The constitutional flaw claimed here is not that the plaintiffs' property is incorrectly valued, or that the assessments violated the substantive requirement of Article X that they be "uniform and equal." Indeed there is no showing that the result would be different if the local assessors had done the job and done it properly. The constitutional issue is merely a claimed lack of authority of the persons who carried out the assessment under color of a statute that had never been declared unconstitutional at the time they acted. Moreover, as we hold today in Department of Local Government Finance v. Commonwealth Edison Co. of Indiana, 820 N.E.2d 1222, 1226, 2005 WL 67130 (No. 49S10-0307-TA-293) (Ind.2005), the law permits an appeal of a property owner's assessments even if the basis of that appeal is an incorrect assessment of other properties. The law thus affords a remedy for any inequity. But that remedy is not upsetting the entire fiscal structure of *1255the county, which would be the result if some taxpayers are assessed on the basis of pre-reassessment values and those who are pleased with the reassessment get its benefits.
IV. Appropriate Relief
The injunctive relief granted by the trial court is inappropriate for reasons apart from lack of jurisdiction. Both the balance of benefits and burdens and the doctrine of laches preclude the injunctive relief awarded by the trial court. These are different ways of making the legal point that this lawsuit for declaratory judgment and injunction comes far too late in the process to obtain the result the plaintiffs seek. Plaintiffs cannot wait until the eve of the date on which already overdue tax bills are to be sent out to launch an attack on a process that has been underway for over three years and is critical to the operation of government.
A. Injunctive Relief is Improper
Although we find the statutes authorizing these assessments to violate Section 22, we are given no basis to conclude that a different result would be produced by a reassessment by local authorities. The trial court found, presumably correctly, that the effect of the reassessment is to increase taxes on some properties compared to the taxes on the same property for prior years. But there is no finding that the reassessment done pursuant to these statutes produced a different result from the assessments that will ultimately prevail if the tax bills are enjoined. Indeed, if the local authorities do their jobs properly, and the reassessment was done properly, there is no basis to conclude they would reach a different result for any specific piece of property. Of course, one can conjecture that there might be differences, but there is no basis to conclude what those differences would be, at least without imputing improper motives to the local authorities. As the State points out, the provisions governing the values to be placed on property are applicable statewide. The only effect of the statutes the plaintiffs attack is to change the agency that performs the assessment, not the substance of what the assessor is to do. Indeed, we have no basis to conclude that the assessed valuations produced by the DLGF or the private firm are any different from what would have been produced by a timely assessment if the local authorities had been able to produce one, or would be produced by a reassessment in the future.
As a matter of basic equity law, and the law of preliminary injunctions, courts must consider the relative benefits and burdens of granting injunctive relief, even if the plaintiffs are correct. See Ind. Family & Soc. Servs. Admin. v. Walgreen Co., 769 N.E.2d 158, 161 (Ind.2002). A court, considering an application for preliminary injunction "will consider the traditional balance of convenience; this is to say, it will consider whether a greater injury would be done by granting the injunction than would result from a refusal to do so." 48A C.J.S. Balancing Equities, Inconvenience, Hardship, or Injury-Temporary or Preliminary Injunction or Restraining Order § 82, 102 (2004). Equity courts are traditionally free to balance equities and hardships in determining whether or not to grant an equitable remedy. Dan D. Dobbs, Law of Remedies, § 2. 4(1), at 91 (2d ed.1998). Moreover, injunctive relief is equitable in nature, and courts will not exercise that authority to produce useless results. State ex rel Board of Sanitary Commissioners of Terre Haute v. Superior Court of Vigo Cty., 247 Ind. 617, 220 N.E.2d 336 (Ind.1966). Given that the new law, which became effective June 30, 2004, would permit the DLGF to redo the *1256entire reassessment and arrive at the same place, injunctive relief must be denied on that ground alone. "The jurisdiction of a court of equity extends no farther than is necessary to do some equitable thing; it has no jurisdiction to do useless, unjust, and inequitable things." In re Hawkins Mortgage Co., 45 F.2d 937, 940 (7th Cir. 1931). "It is an age old axiom that equity will not do a useless thing." Townsend v. Quern, 473 F.Supp. 193, 198 (N.D.Ill.1979). An injunction is to be denied if the public interest would be substantially adversely affected, even if the plaintiff has a claim. Fumo v. Medical Group of Mich. City, Inc., 590 N.E.2d 1103, 1108 (Ind.Ct.App. 1992).
B. Laches
Finally, just as in any other case seeking equitable relief, undue delay in seeking the relief may bar relief. Here the plaintiffs brought this suit on April 29, 2004, seeking to enjoin the Lake County Treasurer from sending out tax bills that should have been due in March 2008. But due to delays in reassessment, the tax bills were already over a year late. The claim is that these two statutes, on the books since 2001, were unconstitutional. Rather than seeking to enjoin the implementation of these reassessment procedures, the plaintiffs waited until they were completed, no other reassessment having been conducted, and then sought to enjoin the collection of 2008 taxes already over one year delayed. This is a classic base for invoking of the equitable doctrine of laches.
Laches is an equitable doctrine. Unlike statutes of limitations, it does not principally turn on time alone. Rather, if a party, with knowledge of the relevant facts, permits the passing of time to work a change of cireumstances by the other party, laches may bar the claim. Shafer v. Lambie, 667 N.E.2d 226, 231 (Ind.Ct.App. 1996). As early as 1996, the need for reassessment was obvious as a result of this Court's decision in Boehm v. Town of St. John, 675 N.E.2d 318 (Ind.1996). The basic fact of the legislature's provision for reassessment in Lake County by private contractors and the DLGF was in the public record and widely publicized since 2001. The county's taxing authorities are now dependent on the results of that process to move forward, if belatedly, to proceed with the ordinary process of funding government. Under these circumstances laches bars granting of an injunction based on facts and theories available to the plaintiffs three years earlier.
Conclusion
The preliminary injunction entered by the trial court is vacated. This case is remanded with instructions to dismiss the complaint for lack of jurisdiction.
DICKSON, J. concurs. SHEPARD, C.J., and SULLIVAN J. concur in Part I with separate opinion by SULLIVAN, J. RUCKER, J. concurs in Parts I, II, and IV, and dissents as to Part III with separate opinion.. P.L. 98-2004 repealed and recodified Title 33. Effective July 1, 2004, this section appears at Ind.Code § 33-26-3-1 (2004).