Four retired state employees (“the Employees”) brought suit against the South Carolina Retirement System and the South Carolina Budget and Control Board (collectively “the Retirement System”) claiming their retirement benefits have been miscalculated. The trial court ruled in favor of the Retirement System and the Employees have appealed.
*343Factual/Procedtjral Background
In 1986, the General Assembly amended S.C.Code Ann. § 9-1-10(17) (Supp.1998) of the South Carolina Retirement System.1 This statute provides the definition of “average final compensation” for a retiring state employee. Average final compensation is one element used in the Retirement System Act to calculate the monthly retirement benefits of a state employee. See S.C.Code Ann. § 9 — 1—1550(B)(1) (Supp.1999).2 The dispute in this case is over the 1986 amendment’s effect on the calculation of the average final compensation of an employee with respect to the value of unused annual leave.
Before 1978, the Retirement System gave a retiring employee credit for all accrued unused annual leave when calculating the average final compensation for retirement benefits. The statutory section read:
(17) “Average final compensation” with respect to those members retiring on or after July 1, 1970, shall mean the average annual eamable compensation of a member during the three consecutive fiscal years of his creditable service producing the highest average.
Under this statute and its predecessors going back to the creation of the system in 1945, the Retirement System, as a matter of policy, gave credit for unused annual leave even though there was no specific requirement in the statutory section that it do so. Furthermore, there was no limit on the amount of accrued annual leave for which an employee could receive credit.
*344In 1978, the General Assembly amended the section and addressed unused annual leave for the first time. After the 1978 amendment, the section read:
(17) “Average final compensation” with respect to those members retiring on or after July 1, 1970, shall mean the average annual earnable compensation of a member during the three consecutive fiscal years of his creditable service producing the highest such average; an amount up to and including forty-five days termination pay for unused annual leave may be added to the pay period immediately prior to retirement and included in the average as applicable.3
The 1978 amendment had two major effects on the use of unused annual leave in the average final compensation calculation. First, the amendment placed a forty-five day cap on the amount of unused annual leave for which an employee could receive credit. Second, the unused annual leave could only be calculated in the average final compensation equation if the pay period immediately prior to the employee’s retirement was one of the three highest in the employee’s career. As a consequence of this second restriction, employees would regularly have to retire on the last day of their last fiscal year to ensure that any unused annual leave would be included in the calculation. Servicing a large volume of retirement claims at one time created an administrative problem for the Retirement System.
In 1986, the General Assembly amended section 9-1-10(17) to read as follows:
(17) “Average final compensation” with respect to those members retiring on or after July 1, 1986, means the average annual earnable compensation of a member during the twelve consecutive quarters of his creditable service on which regular contributions as a member were made to the System producing the highest such average; a quarter means a period January through March, April through June, July through September, or October through December. An amount up to and including forty-five days’ *345termination pay for unused annual leave at retirement may be added to the average final compensation----4
Both sides in this matter agree that the General Assembly intended to alter the calculation of average final compensation. The dispute in this case is over the nature of the change in unused annual leave benefits.
The parties disagree about whether the amendment changed the method of adding any unused annual leave to the average final compensation equation. Before the 1986 amendment, it is undisputed that the value of the unused annual leave was added into the average final compensation equation before the total was averaged. After the amendment, the Employees claim the value of the unused annual leave should be added to the average final compensation equation after the average has been taken. The Retirement System’s position is that the unused annual leave should still be added into the average final compensation equation before the average is taken.
The Employees filed suit against the Retirement System in November 1995, seeking a declaratory judgment as to the meaning of section 9-1-10(17). The trial court noted that section 9-1-10(17), defining average compensation, does not contain the provisions for the payment or calculation of retirement benefits to the employee. The payment and benefit calculation provisions are contained in section 9-1-1550. Analyzing this relationship, the trial court found “harmony of these provisions is critical in the calculation of a retiree’s monthly benefit.” The trial court then noted that the 1986 amendment dividing the definition of average final compensation into two separate sentences, where it had previously been only one, added confusion to the process. The trial court determined that the first sentence of section 9-1-10(17) alone was the definition of average final compensation. The trial court then found that the second sentence discussing the addition of unused annual leave to the first sentence’s definition of average final compensation produced a new number that the Employees called “total final compensation.” The trial court determined that this new “total final compensation” number was not referenced in section 9-1-1550 so there *346existed an ambiguity about how the General Assembly intended to compute average final compensation in relation to the unused annual leave.
The trial court then looked to the rules of statutory construction to determine the intent of the General Assembly in regards to the calculation of average final compensation. First, the trial court analyzed what it determined to be the legislative history of the 1986 amendment. The trial court also looked at the Retirement System’s statutory scheme as a whole. The trial court gave deference to the interpretation of the statute by the Retirement System. Furthermore, the trial court determined that the use of the word “may” in reference to the addition of unused time to the average final compensation resulted in total discretion on the part of the Retirement System as to whether any unused annual leave would be added into the equation. Finally, the trial court found that even if the Employees were correct in their interpretation, S.C. Const, art X, § 16 prevented them from recovering the requested relief.
Law/Analysis
I. Section 9-1-10(17) is Ambiguous
The first question of statutory interpretation is whether the statute’s meaning is clear on its face. “If a statute’s language is plain and unambiguous, and conveys a clear and definite meaning, there is no occasion for employing rules of statutory interpretation and the court has no right to look for or impose another meaning.” Paschal v. State Election Comm’n, 317 S.C. 434, 436, 454 S.E.2d 890, 892 (1995). We find the language of section 9-1-10(17) is ambiguous on its face because it is unclear at what point the General Assembly intended the unused annual leave to be added in the average final compensation equation.
The section can be read, as the Employees argue, that up to 45 days are added to the equation after the average is taken. The section can also be read as the Retirement System argues, adding up to 45 days of unused annual leave to the average final compensation equation before taking the average of the 12 highest quarters. The use of the phrase “average final compensation” in the section that defines “aver*347age final compensation” is confusing. Also, ambiguity arises from the General Assembly’s use of the phrase “added to.” In a statute, the word “to” can be read as a word of either inclusion or exclusion depending on the intent of the General Assembly. Black’s Law Dictionary 1487 (6th ed.1990).5 The plain language of the section fails to reveal the General Assembly’s intention with regard to the meaning of “added to.”6
*348Therefore, since the plain language of the statute lends itself to two equally logical interpretations, this Court must apply the rules of statutory interpretation to resolve the ambiguity and to discover the intent of the General Assembly. Where the language of an act gives rise to doubt or uncertainty as to legislative intent, the construing court may search for that intent beyond the borders of the act itself. The Lite House, Inc. v. J.C. Roy, Co., 309 S.C. 50, 53, 419 S.E.2d 817, 819 (Ct.App.1992).7 When looking beyond the language of section 9-1-10(17) and comparing this section with the overall structure of the South Carolina State Retirement System, we find the General Assembly intended the 45 days of unused annual leave to be added to the computation before taking the average of the 12 highest quarters.
The most powerful indication of legislative intent is the lack of legislative history and debate which accompanied the adoption of section 9-l-10(17).8 If section 9-1-10(17) is interpreted to mean the unused leave is added after the average is taken, a dramatic increase in benefits will result. In effect, this interpretation would increase the dollar value for unused annual leave three fold,9 and would allow members to retire with benefits calculated on an “average” salary which is greater than any salary they earned during employment. The Retirement System’s consulting actuary testified the actuarial *349present value of the unfunded liability created by the Employees’ interpretation is $1,177 billion dollars.10 Therefore, had the legislature intended the statute to be applied as argued by the Employees, they would have been dramatically increasing the payments to retirees.
If the General Assembly intended to add the leave after the average was taken, it is reasonable to assume the history and circumstances surrounding the amendment would indicate the General Assembly intended to increase benefits, thereby adding $1,177 billion in liability to the State Retirement System. The history in no way indicates the legislature intended to make such a dramatic increase in benefits. First, the title of the 1986 Appropriations Act, which included the amendment to section 9-1-10, did not reference an increase in benefits.11 See Ex Parte Georgetown County Water & Sewer Dist., 284 S.C. 466, 468-69, 327 S.E.2d 654, 656 (1985) (“The purpose of Article III, § 17 is to prevent the General Assembly from being misled into the passage of bills containing provisions not indicated in their titles.”) The title to the 1986 Appropriations Act provides, in relevant part:
To amend sections 9-1-10 and 9-11-10 of the 1976 Code, relating to the South Carolina Retirement System and the *350South Carolina Police Officers Retirement System, so as to change the definition of average final compensation from average annual earnable compensation of a member during three consecutive fiscal years to twelve consecutive quarters.
The plain language of the title gives no indication or notice that the amendment would triple the dollar value for unused annual leave.
Secondly, had the General Assembly intended to increase benefits and spend $1,177 billion, it is reasonable to assume they would have engaged in floor debate. They did not.12 Furthermore, no fiscal impact analysis was undertaken. See S.C.Code Ann. § 2-7-72 (Supp.1999) (Bills and resolutions requiring expenditure of funds shall have impact statements).13 Finally, the legislature did not determine whether the increase would impact the actuarial soundness of the State Retirement System as a whole. While we hold the amendment to section 9-1-10(17) does not violate S.C. Const. art. X, § 16, the fact that the legislature has never funded the increase as required by article X, § 16 is further evidence the legislature did not *351intend to bestow such an increase when it amended section 9-1-10(17).
Policy considerations also weigh in favor of the Retirement System’s interpretation. It must be assumed the legislature intends to maintain the soundness of the State Retirement System. If the Court accepts the Employees’ interpretation, the dramatic increase in liability might render the System unsound. Donald Overholser (“Overholser”), the Retirement System’s actuary, testified the interpretation sought by the Employees would make the entire State Retirement System actuarially unsound. Thomas Cavanaugh (“Cavanaugh”) of Gabriel, Roeder, Smith & Company also testified the $1,177 billion unfunded liability would leave the System actuarially unsound.14 Cavanaugh and Overholser were qualified by the court without objection as experts in the field of actuarial valuation. The Employees presented no expert testimony or any testimony to contradict Cavanaugh and Overholser’s conclusion. Instead, the Employees claim the Court and the actuaries should only consider the amount of money it would take to pay off their plaintiff class, not the effect of the interpretation on the system as a whole. This position ignores the rule of statutory construction that, absent a change by the legislature, the statute will apply to all state employees who will retire in the future.
Furthermore, we find the Employees’ interpretation of the statute, which would have the unused annual leave added after the total is averaged, leads to an absurd result that the Legislature could not have intended. See Gentry v. Yonce, 337 S.C. 1, 522 S.E.2d 137, 143 (1999) (“Statutes should not be construed so as to lead to an absurd result.”); Kiriakides v. United Artists Communications, Inc., 312 S.C. 271, 440 S.E.2d 364 (1994) (the court should reject a meaning when to accept it would lead to a result so plainly absurd that it could not have been intended by the legislature). We hold the Employees’ interpretation of the statute leads to the absurd result of rendering the State Retirement System actuarially unsound.
*352As discussed previously, the Retirement System’s actuary, Overholser, and Cavanaugh testified that the present value of the unfunded liability created by the Employees’ interpretation is $1,177 billion dollars.15 Overholser further testified the inclusion of an additional unfunded liability of $1,177 billion dollars would increase the unfunded amortization period of the System from nineteen to fifty-five years.16 The Government Accounting Standards Board mandates that public pension plans’ amortization period should not exceed thirty years. On the evidence presented to the trial court, the State Retirement System would become actuarially unsound if this Court adopts the Employees’ interpretation. Furthermore, an employer’s bond and credit rating can be affected by an amortization period in excess of thirty years, and can impact an employer’s ability to borrow.
Construing the statute so as to cause such a devastating impact on the fiscal integrity of the State Retirement System, especially in the absence of any fiscal impact report or meaningful debate from the Legislature, would lead to an absurd result that could not have been intended by the legislature.
II. The Use of the Term “May” Does Not Grant the Retirement System Unlimited Discretion
The Retirement System argues that the use of the phrase “may” in section 9-1-10(17)17 gives the Retirement System complete discretion as to whether and how to add the unused annual leave. We disagree.
The term “may” is used in section 9-1-10(17) to allow the Retirement System to add unused annual leave into an employee’s benefits calculation if the employee retires with any unused leave. The use of the word “may” signifies *353permission and generally means that the action spoken of is optional or discretionary unless it appears to require that it be given any other meaning in the present statute. See State v. Wilson, 274 S.C. 352, 356, 264 S.E.2d 414, 416 (1980). In this section, since it is very common for employees to retire without any accrued annual leave, the use of the word “may” allows the Retirement System to add such leave, if it exists, to the equation.
The construction given to the word “may” by the trial court would result in unfettered discretion by the Retirement System in determining whether to grant or deny credit for unused annual leave. It would allow the Retirement System to treat employees with the same number of unused annual leave days differently. This discretion would be entirely inappropriate in a statute defining retirement benefits computation. Absolute equality of treatment to similarly situated beneficiaries is the hallmark of a qualified defined benefits pension plan. The only reasonable construction of the word “may” is that it allows the Retirement System to include up to 45 days, and no more, in the calculation, if the employee has such unused leave when he retires.
III. The Testimony of Purvis Collins about Legislative Intent Was Inadmissible
The Employees argue that the trial court erred in admitting the testimony of Purvis Collins and relying on his testimony in construing section 9-1-10(17). We agree.
Purvis Collins, who at the time of this case was retired and is now deceased, was the director of the Retirement System for 24 years. Mr. Collins has been recognized nationally as one of the country’s leading governmental retirement system administrators. This Court has the highest respect for Mr. Collins’ knowledge, ability, and integrity. Nevertheless, as a matter of law, the testimony of Mr. Collins, an executive branch officer, as the “author” of a legislative amendment, is not admissible as evidence of legislative intent. Not even members of the General Assembly are permitted to so testify. “It is a settled principle in the interpretation of statutes that even where there is some ambiguity or some uncertainty in the language used, resort cannot be had to the *354opinions of legislators or of others concerned in the enactment of the law, for the purpose of ascertaining the intent of the legislature.” Greenville Baseball, Inc. v. Bearden, 200 S.C. 363, 371, 20 S.E.2d 813, 817 (1942)(emphasis added). In the current matter, the Retirement System claims that Collins’ testimony is admissible because it only addressed “problems surrounding the 1978” version of the statute and not the legislative intent. The record does not support the Retirement System’s position.
Collins’ testimony goes well beyond any limited role claimed for it by the Retirement System. Collins testified extensively about how he drafted the amendment and what he intended the amendment to accomplish. Such testimony of what he intended as “author” of the amendment, as well as what problems he intended the amendment to address, are not proper legislative history for a court to take into account. See Tallevast v. Kaminski, 146 S.C. 225, 143 S.E. 796 (1928).
Collins’ testimony is not completely inadmissible. In his role as the head of the South Carolina Retirement System, Collins’ testimony is relevant, although not controlling, to the extent that it discusses how the executive branch interpreted the amendment after its enactment. See Nucor Steel v. South Carolina Public Serv. Comm’n, 310 S.C. 539, 426 S.E.2d 319 (1992). For the reasons discussed, we find the executive agency’s interpretation does reflect the legislative intent of the section.
In light of our holding, we do not need to address the Employees’ claims concerning the class certification and statute of limitations.
Conclusion
Based on the foregoing, we AFFIRM in result the decision of the trial court.
MOORE, WALLER and PLEICONES, JJ., concur. BURNETT, J., concurring in part and dissenting in part in a separate opinion.. The General Assembly also amended S.C.Code Ann. § 9-11-10(14) (Supp.1998) involving the Police Officer Retirement System. The issues regarding that amendment are identical to the issues regarding the amendment of section 9-1-10(17). To avoid redundancy, we only discuss the amendment’s effect on section 9-1-10(17) and will address the issues in terms of that statute. There are no significant differences between the two sections and our decision applies equally to each provision.
. The formula provided in this section is:
.0182 x “Average Final Compensation” x Years of Service = Annual Retirement Allowance
. The bold type indicates the language added to the section.
. The bold type indicates the new language.
. "To. While this is ordinarily a word of exclusion, when used in describing premises, it has been held that the word in a statute may be interpreted as exclusionary or inclusionary depending on the legislative intent as drawn from the whole statute. Clark v. Bunnell, 172 Colo. 32, 470 P.2d 42, 44 (1970). It may be a word of inclusion, and may also mean ‘into.’ ”
. Plaintiff Wolfe’s unused annual leave had a value of $5,875. Under the Retirement System’s approach, Wolfe’s average final compensation would be calculated as follows:
$96.190 (the total of his 12 highest quarters! + $5.875 = $34,022 3
As a retired police officer, Wolfe’s average final compensation would then be put into section 9-11-60 (.0214 x “Average Final Compensation” x Years of Service = Annual Retirement Allowance)
.0214 x $34,022 x 30 = $21,842.13 (Annual Retirement Allowance)
$21,842.13 / 12 = $1,820.18 (monthly benefits payment to Wolfe)
Under the Employees approach, Wolfe’s average final compensation would be calculated as:
$96.190 (the total of his 12 highest quarters) = $32,064 + $5,875 = $37,939 3
Put into section 9-11 -60:
.0214 x $37,939 x 30 = $24,356.84 (Annual Retirement Allowance)
$24,356.84 / 12 = $2,029.74 (monthly benefits payment to Wolfe)
$2,029.74 - Monthly Payment Under Employee’s approach
$1.820.18 - Monthly Payment Under Retirement System’s approach
$ 209.56 Difference Between Methods
. Although the court may look beyond the borders of the act itself, the trial court erred in relying heavily on the testimony of Purvis Collins to determine legislative intent. Under South Carolina law, neither a drafter nor a legislator can testify as to legislative intent. Greenville Baseball, Inc. v. Bearden, 200 S.C. 363, 20 S.E.2d 813 (1942).
. Contrary to the dissent's assertion, this Court has used the lack of legislative history as a factor in interpreting a statute. See Robertson v. State, 276 S.C. 356, 278 S.E.2d 770 (1981) (wherein we concluded, after a review of a statute's legislative history which revealed no specific reason for a change in its wording, that the legislature did not intend the change to affect substantial rights); see also Chestnut v. South Carolina Farm Bureau Mut. Ins. Co., 298 S.C. 151, 378 S.E.2d 613 (Ct.App.1989). As in Robertson, there is nothing in the legislative history surrounding the enactment of section 9-1-10(17) which would indicate the legislature intended to dramatically effect the calculation of retirement benefits.
.For example, plaintiff Wolfe's monthly benefits increase by $209.45 per month under this interpretation.
. The actuary arrived at this figure by determining the funding required to pay the increase in benefits for current retirees, and the funding required to pay the increase in benefits for current employees who may retire. The actuary calculated the liability based on employees retiring in the future with an average of 22.5 days of unused annual leave. However, if the Employees’ interpretation stands, retiring employees will have a great incentive to retire with the full 45 days, and therefore the estimated $1,177 billion liability might well be much greater. The Employees do not present their own actuary, or dispute the Retirement System’s actuary. They simply argue the Court should only look at the amount of money it would take to pay the current litigants, since future retirees are not before this Court. The Employees' argument is without merit. The statute, and therefore the Court’s interpretation of the statute, applies not only to the Employees as plaintiffs in this case, but also to all state employees who have retired and who will retire in the future.
. The dissent argues the title of a bill has never been a factor in determining legislative intent. In interpreting a statute in Whetstone v. South Carolina Dep’t of Highways and Pub. Transp., 272 S.C. 324, 327, 252 S.E.2d 35, 37 (1979), this Court stated its interpretation was supported by the "... underlying legislative history as exemplified by the original title of the pre-codified Act.”
. Upon reviewing the Legislative History surrounding the 1986 Appropriations Act, we find no evidence of floor debates, or any meaningful discussion of the amendment to section 9-1-10(17), although there are numerous other debates surrounding the 1986 Appropriations Act. The dissent suggests the lack of debate only means there was little controversy surrounding the amendment's enactment. However, it is hard to imagine, especially in light of the numerous amicus briefs filed in this case, there would have been little debate or controversy had everyone been aware the amendment would mean a dramatic increase in retirement benefits for a defined group.
. For example, in the same year section 9-1-10(17) was amended, the General Assembly passed House Bill No. 3637, which amended the Police Officers Retirement System so as to include National Guard and Reserve Service in the Retirement calculation. House Bill 3637 was accompanied by a fiscal impact statement. The dissent argues this Court has never used the lack of a fiscal impact statement as a factor in statutory interpretation. Financial bills almost always include an impact statement, and, therefore, this Court has most likely not been confronted with the absence of such a statement in a financial bill. The amendment to section 9-1-10(17), if interpreted as the Employees argue, would add an enormous increased cost to the South Carolina Retirement System. It is far from unreasonable to assume our legislature would have undertaken an impact analysis had they intended to bestow such a great increase in retirement benefits.
. This is further evidence of legislative intent to add unused leave before the final average is taken.
. The dissent argues the unfunded liability number is much lower. Although we find $1,177 billion to be the correct figure, even a quarter of that figure, as suggested by the dissent, would cause dire consequences to the Retirement System.
. The Police Officers Retirement System would increase from a period of seven years to infinity.
. "An amount up to and including forty-five days’ termination pay for unused annual leave at retirement may be added to the average final compensation ...”