This case and the companion case decided today, Reagan for President Committee v. Federal Election Commission, 734 F.2d 1569, both present the issue of whether the Federal Election Commission (FEC or Commission) acted within its statutory authority under the Primary Matching Payment Account Act (the Act), 26 U.S.C. §§ 9031-9042, in ordering a candidate to repay to the government the full amount of his campaign’s unqualified expenditures without regard to whether those expenditures were paid out of federal matching funds or private contributions. We find that the statute gives rise to a repayment obligation only when the FEC determines that federal matching funds were used for unqualified purposes, and limits the repayment obligation to the amount of federal matching funds that the Commission reasonably determines were used for such unqualified purposes. The Commission’s regulation, *1560however, on its face and as applied to the Kennedy for President Committee in this case, indulges the unreasonable presumption that all unqualified expenditures are paid out of federal matching funds. We therefore reverse the Commission’s order because it failed to make a reasonable determination of the amount of federal matching funds used by the Committee for unqualified purposes, and does not limit the Committee’s repayment obligation to such an amount.
I. Background
On April 14, 1983, after lengthy administrative audits, the FEC determined that the Kennedy for President Committee (Committee) had exceeded the 1980 campaign expenditure limits by $14,889.17 in New Hampshire and $40,611.16 in Iowa.1 Accordingly, the Commission found that the Committee had spent a total of $55,-500.33 for unqualified purposes during the 1980 campaign. Invoking and applying FEC repayment regulations, the Commission ordered the Committee to repay the full $55,000.33 to the United States Treasury.2
The Committee does not challenge the FEC’s determination of the amount of unqualified expenditures. Rather, it contends *1561that the Commission exceeded its statutory authority by ordering the repayment of the entire amount of those unqualified expenditures. According to the Committee, the Act requires the FEC to order repayment of only the amount of matching funds used for unqualified purposes. The Committee believes that the FEC is not authorized to demand repayment of the entire amount of unqualified spending. Instead, the Committee proposes that the repayment sum be calculated by “multiplying the total amount of unqualified expenditures by the proportion of matching funds to total campaign funds.” Committee Brief at 16.
As explained below, we reverse the FEC’s repayment order because it exceeds the FEC’s authority under 26 U.S.C. § 9038. We hold that the statute requires the Commission to make a reasonable determination of the amount of matching funds used for unqualified purposes, and to limit its repayment order to that amount. However, because the statute does not prescribe a particular method for making the determination — while it does prescribe a method for determining the amount of surplus campaign funds to be repaid to the Treasury, see 26 U.S.C. § 9038(b)(3) — we believe that the Commission enjoys discretion in formulating a proper method for calculating the amount of unqualified expenditures attributable to matching fund sources. We therefore do not think that the Committee’s proposed method should be judicially mandated as the sole acceptable formula for calculating repayment obligations. At the same time, we think it is clearly unreasonable to presume that 100 percent of unqualified expenses are fairly attributable to federal matching funds. Accordingly, we reverse the FEC order and remand for further proceedings consistent with this opinion.
II. Discussion
The relevant section of the Act provides:
If the Commission determines that any amount of any payment made to a candidate from the matching payment account was used for any purpose other than ... [qualified campaign expenses,] it shall notify such candidate of the amount so used, and the candidate shall pay to the Secretary an amount equal to such amount.
26 U.S.C. § 9038(b)(2). By its terms, therefore, the statute creates a repayment obligation only “[i]f the Commission determines” that matching fund payments were used for unqualified purposes, and expressly limits the repayment obligation to “such amount,” i.e., the amount of matching funds “so used.” Because nothing in the legislative history suggests that Congress *1562intended any other result, we interpret the statute in accordance with its straightforward meaning.
The FEC regulations, by contrast, require repayment of “any payment made to a candidate from the matching payment account or any contributions received by the candidate” used for unqualified purposes. 11 C.F.R. § 9038.2(a)(2) (1982) (emphasis added).3 Thus the regulations require repayment of unqualified expenditures regardless of whether the expenditures could properly be attributed to federal matching fund payments.4 We believe that if Congress had intended the total amount of every unqualified expenditure to be repaid, the statute would not have expressly limited the repayment obligation to unqualified expenditures paid out of matching fund sources.
Instead, the statute contemplates a “Commission determin[ation]” that the sum to be repaid equals the “portion of [the] payments] made to a candidate from the matching payment account [that] was used for” unqualified purposes. 26 U.S.C. § 9038(b)(2). Since federal funds and private contributions are commingled in the candidate’s coffers, this determination may never be perfectly accurate. Nevertheless, the statute delegates to the Commission the task of estimating the amount of federal funds, rather than private contributions, that were spent for unqualified purposes. By requiring repayment of 100 percent of the amount of all unqualified expenditures, without at least estimating the extent to which such expenditures derived from matching fund sources, the Commission has shirked its statutory responsibility to make a reasonable determination that the repayment sum represents the matching funds used for unqualified purposes. After all, matching funds do not comprise even fifty percent of total funds in any campaign.5 For this reason, we believe the regulation and the order in which the Commission applied that regulation, see FEC Statement of Reasons at 14 n. 12, reprinted in Joint Appendix (J.A.) at 210, exceed the FEC’s statutory authority under 26 U.S.C. § 9038(b)(2).6
The FEC believes that well-established rules of statutory construction support its *1563interpretation of section 9038(b)(2). As the Commission reminds us, the Act specifically requires candidates at the end of a campaign to repay out of their surplus funds “that portion of any unexpended balance ... which bears the same ratio to the total unexpended balance as the total amount received from the matching payment account bears to the total of all deposits made into the candidate’s accounts.” 26 U.S.C. § 9038(b)(3). In contrast, the statute provides no specific formula for the repayment of amounts used for unqualified purposes. See id. § 9038(b)(2). In light of “the presumption that ‘where Congress includes particular language in one section of a statute but omits it in another section of the same Act, ... Congress acts intentionally and purposely in the disparate inclusion and exclusion,’ ” FEC Brief at 25 (quoting United States v. Martino, 681 F.2d 952, 954 (5th Cir.1982) (en banc) (citations omitted)), the Commission argues that the Committee’s proposed repayment formula, see supra at 1561 — which is identical to the formula specified in the statute for surplus repayments — should not be mandated for repayments of unqualified expenditures, for which Congress specified no particular formula.
We agree with the FEC that section 9038(b)(2) mandates no particular re-payment formula, but we do not agree that the FEC’s repayment scheme is therefore within the bounds of the statute’s delegated authority. The statute’s silence as to the proper repayment formula for unqualified expenditures, read alongside its quite definite mandate of a particular repayment formula for surplus funds, manifests a discernible congressional intent to accord to the FEC discretion in the formulation of a method for determining the repayment obligations of candidates who have used matching funds for unqualified purposes. Such leeway, however, does not authorize the FEC to abandon its responsibility to arrive at some reasonable method for determining the extent to which matching funds, rather than private contributions, were used for unqualified purposes. We think it to be patently unreasonable for the FEC to assume, as it did in this case, that all unqualified expenditures were paid out of matching funds. Thus, the principle of statutory interpretation invoked by the FEC, properly applied, justifies only an inference that Congress afforded to the FEC discretion to devise a formula for determining repayment obligations due to unqualified expenditures. This discretion, however, does not legitimate such a clearly unreasonable formula as the one used by the FEC in this case.7
Finally, we note that the Commission’s express rationale for its repayment *1564formula fails adequately to support its action. In promulgating the repayment rule, the FEC said:
If a candidate spends private campaign contributions ... on nonqualified campaign expenses, those private funds would obviously not be available to defray the candidate’s qualified campaign expenses. The net result would be that the candidate would subsequently require more public funding to meet his or her qualified expenses. In essence, this additional public funding would restore private campaign funds diverted by the candidate to nonqualified campaign purposes. Such an outcome would be equivalent to permitting a candidate to use matching funds to defray nonqualified campaign expenses.
44 Fed.Reg. 20336 (Apr. 4, 1979). The Commission offers this very same rationale in support of its action in this case. See FEC Brief at 17-19. While the FEC’s rationale is not entirely clear,8 this passage appears to argue that an unqualified expenditure depletes the candidate’s total campaign funds available for qualified spending, and that therefore the final “net result” of the unqualified expenditure will be the spending of federal funds that would not have been spent absent the unqualified expenditure. Of course, an unqualified expenditure, like any other expenditure, will reduce the campaign’s overall available funds, and thus cause more federal monies to be spent than otherwise would have been spent.9 The relevant question, however, is how much extra federal money be spent as a result of the unqualified expenditure?
Certainly, it would be unreasonable to think that all the extra spending would be paid out of federal funds. After all, the candidate’s qualified expenditures are paid out of the commingled pool of federal and private monies. It is therefore not plausible to presume that the additional money spent as a result of an unqualified expense is comprised entirely of federal money.
In fact, the true “net result” of the depletion of the overall campaign fund will be either an increase in the campaign’s final deficit or a decrease in the campaign’s final surplus. In the case of a deficit, the total federal funds would have been spent *1565regardless of the unqualified expenditure.10 In the case of a surplus, the government is entitled to recover only its pro rata share of the final campaign surplus. See supra at 1562-63. Accordingly, insofar as the FEC’s repayment formula for unqualified expenditures looks to the “net result” of the unqualified expenditures, see 44 Fed.Reg. 20336, it appears that a pro rata formula, such as the one proposed by the Committee, would be reasonable. However, in view of the discretion afforded to the FEC by the Act, see supra at 1563, and the evident wisdom of permitting the Commission to devise for itself a formula suited to the unqualified expenditures area,11 we do not believe that the FEC must employ the pro rata formula suggested by the Committee.
Finally, the Commission suggests that its repayment formula merely “recoups [the] money expended by the candidate in violation of conditions he or she voluntarily assumed in order to receive the matching funds.” FEC Brief at 20 n. 13. However, while the Act imposes spending limits on the candidates, see 26 U.S.C. § 9035, the remedy prescribed under the administrative audit procedure is the repayment of the amount of federal money spent for unqualified purposes, not the total amount of unqualified expenditures. As explained supra note 1, often a candidate may violate spending limitations inadvertently and against his own intentions. When a candidate knowingly and willfully violates the spending ceilings, more serious penalties may be imposed so long as more elaborate procedural safeguards are respected. See 2 U.S.C. § 437g; 26 U.S.C. § 9042; see also Reagan Bush Committee v. FEC, 525 F.Supp. 1330, 1337 (D.D.C.1981) (“Repayment determinations are not considered to involve violations of law, but ‘Criminal penalties are provided for willful violations constituting prohibited transactions.’ ”) (quoting H.Rep. No. 708, 92d Cong., 1st Sess. 57 (1971) (Conference Report on Revenue Act)). Thus, when the FEC orders repayment pursuant to an administrative audit, the statute authorizes the agency to “recoup” only the federal funds spent for unqualified expenditures; when more serious violations have occurred, more extensive penalties are available to deter deliberate wrongdoing.
III. Conclusion
For the reasons set forth above, we vacate the order of the Commission and remand for further proceedings consistent with this opinion.
So ordered.
. Under 26 U.S.C. § 9035, campaign expenditures are not "qualified" if they exceed certain spending limits, including limitations on spending in each state during the presidential primaries. See Carter/Mondale Pres. Comm. v. FEC, 711 F.2d 279, 280 n. 2 (D.C.Cir.1983). In this case, the FEC found that the Committee had exceeded the 1980 New Hampshire spending limitation ($294,400) by $14,889.17 and the 1980 Iowa limitation ($489,881) by $40,611.16. See FEC Statement of Reasons at 14, reprinted in Joint Appendix (J.A.) at 210.
The determination of the amount spent by a candidate in any given primary often involves a complex allocation of campaign expenditures— such as overhead, salaries, telephone and travel expenses — to a particular state, and the administrative audit in this case involved such an elaborate inquiry. See J.A. 1-167. Accordingly, the violation of campaign spending limitations is often, if not usually, inadvertent. No allegation has been made in this case that the Committee willfully or knowingly violated those limitations. See Reagan Bush Comm. v. FEC, 525 F.Supp. 1330, 1337 (D.D.C.1981) ("Repayment determinations are not considered to involve violations of law, but ‘Criminal penalties are provided for willful violations constituting prohibited transactions.’ ”) (quoting H.Rep. No. 708, 92nd Cong., 1st Sess. 57 (1971) (Conference Report on Revenue Act)); cf. 26 U.S.C. § 9042 (criminal penalties for knowing and willful spending for unqualified purposes).
. See FEC Statement of Reasons at 14-15 & n. 12, reprinted in J.A. at 210-11. The Commission contends that the Committee is precluded from raising the repayment formula issue on appeal because the Committee "fail[ed] to present a timely objection" during the administrative proceeding. FEC Brief at 17.
Generally, a reviewing court will refuse to hear claims that were not properly raised before the administrative agency. As the Supreme Court once explained, “Simple fairness ... requires as a general rule that courts should not topple over administrative decisions unless the administrative body not only has erred but has erred against objection made at the time appropriate under its practice.” United States v. L.A. Tucker Truck Lines, 344 U.S. 33, 37, 73 S.Ct. 67, 69, 97 L.Ed. 54 (1952).
However, when the agency in fact considers the issue on the merits, this general exhaustion requirement can be satisfied even if the party did not properly raise it. See, e.g., Washington Ass’n for Television & Children v. FCC, 712 F.2d 677, 682 & n. 10 (D.C.Cir.1983) (citing cases). While the FEC in its Statement of Reasons maintained that the repayment formula had been raised "more than one year out of time,” Statement of Reasons at 3, reprinted in J.A. at 199, it nevertheless proceeded to address the issue on the merits, see id. at 14 & n. 12, reprinted in J.A. at 210-11.
Moreover, the Committee raised the repayment formula issue three months before the FEC made its final determination in this case. See Letter from William C. Oldaker to Charles N. Steele (Dec. 29, 1982), reprinted in J.A. at 182-84; cf. Carter/Mondale, 711 F.2d at 288-89 (candidate raised issue after final repayment determination). The FEC contends that the Committee raised the issue out of time under its regulations then in effect. While those regulations provided that the Committee would be "given an opportunity to submit in writing, within 30 days of receipt of the Commission’s notice, legal or factual materials to demonstrate that repayment is not required,” 11 C.F.R. § 9038.2(b) (1982), there was no express limitation that this 30-day period would be the only period during which a candidate could submit such materials if the Commission decided to take more than 30 days to issue a final decision. Indeed, the regulations specifically declared that "[t]he Commission will consider any written legal or factual materials submitted by the can*1561didate in making its final determination.” 11 C.F.R. § 9038.2(c) (1982) (emphasis added). Accordingly, the regulations might be read to require that the Commission accord the candidate at least a 30-day period before a final decision is rendered, during which the candidate could submit comments and raise issues. Nothing in those regulations provided that issues could not be raised after the 30 day period if the Commission had not yet rendered its decision. We note that the Commission has recently revised its procedural rules to clarify that a candidate must raise a disputed issue within the 30-day period. See 11 C.F.R. § 9038.-2(c) (1983).
We think that the above factors, taken together, satisfy the exhaustion requirement. In its brief, however, the FEC argues that this court’s decision in Carter/Mondale, supra, controls this case, and that therefore the Commission’s determination should be allowed to stand regardless of whether its substantive legal basis is sound. See FEC Brief at 13-15. However, Carter/Mondale does not control this case. In Carter/Mondale, this court refused to assume jurisdiction because the candidate had failed to bring an appeal within 30 days of the Commission’s final action, as required by statute. See Carter/Mondale, 711 F.2d at 280, 289-91; 26 U.S.C. § 9041(a) (petition for review must be filed "within 30 days after the agency action by the Commission for which review is sought”). In this case, by contrast, there is no question that the statutory prerequisites for judicial review have been met. Instead, the Commission seeks to prevent judicial review on the grounds that administrative remedies were not exhausted. As we explained above, however, the exhaustion doctrine does not preclude review under the circumstances of this case.
. In 1983, the Commission revised its repayment regulations. However, no substantive change was made in the repayment formula at issue in this case. See 11 C.F.R. § 9038.-2(b)(2)(i) (1983).
. As the Commission has acknowledged, its existing regulations could conceivably result in the repayment of a greater sum of money than the candidate received in federal matching payments. See Letter to the Panel from Richard B. Bader, Assistant Gen. Counsel for FEC (Feb. 9, 1984).
. In determining the amount of matching fund payments to which an eligible candidate is entitled, the Commission must disregard “any amount of contributions from any person to the extent that the total of the amounts contributed by such person ... exceeds $250” during the relevant period. 26 U.S.C. § 9034(a); see 11 C.F.R. § 9034.2(a)(2) (1983). Also, numerous kinds of receipts are not "matchable," such as cash contributions, credit card transactions, in-kind contributions, and contributions made before the matching payment period begins. See 11 C.F.R. §§ 9034.2, 9034.3 (1983). See generally FEC, Financial Control and Compliance Manual for Presidential Primary Candidates Receiving Public Financing I-34 (rev. ed. Feb. 1983). As a result, matching payments will never truly "match" all private campaign contributions, and will usually constitute significantly less than fifty percent of the candidate’s total funds.
. The statute authorizes the FEC to recoup only an amount "equal to” the federal monies spent for unqualified purposes; it therefore mandates not only the "repayment of the amount of federal matching funds used for unqualified expenditures,” Diss.Op. at 1567, but also that the repayment amount be limited to that amount. Thus, we cannot agree with the dissent’s notion that "by requiring repayment of the entire amount of unqualified expenditures, [the rule] ensures that this [statutory] mandate is achieved." Id. Instead, we believe the FEC rule runs counter to the statute because it requires repayment without even attempting to determine how much of the unqualified expenditure came out of federal matching payments.
Accordingly, we think this case presents a quite different circumstance from FEC v. Democratic Senatorial Campaign Committee, 454 U.S. 27, 102 S.Ct. 38, 70 L.Ed.2d 23 (1981). In DSCC, the Supreme Court deferred to the agency’s statutory interpretation only after first finding that the statute did "not expressly or by implication” *1563forbid the agency action under review. 454 U.S. at 39, 102 S.Ct. at 46, see id. at 36, 102 S.Ct at 44. In this case, by contrast, the statute plainly allows the Commission to take back only the amount of federal funds used for unqualified purposes, and the Commission’s rule clearly exceeds that limitation. Our decision today therefore does not reject a "sufficiently reasonable” interpretation of the statute in favor of a construction we think best. Cf. Diss.Op. at 1568. It merely vacates an agency order — perhaps supportable as a matter of pure policy — that does not comport with the plain language of section 9038.
. The Commission argues that Congress affirmatively sanctioned the repayment regulations by failing to override the regulations when they were transmitted to Congress pursuant to the legislative veto provisions contained in the Act. See 26 U.S.C. § 9039(c). Given the clear indications in the Act that repayments should be limited to the amount of matching funds used for unqualified purposes, see supra at 6-8, we do not believe that the simple existence of a legislative veto provision should immunize an agency from challenges that its action oversteps its statutory authority. After all, almost 300 statutes contain such legislative veto provisions, see INS v. Chadha, — U.S. -, -, 103 S.Ct. 2764, 2781, 77 L.Ed.2d 317 (1983), and we do not believe that Congress' failure to exercise its purported authority under one of those provisions should be taken as conclusive evidence of congressional approval. While the interpretation of a statute by an agency charged with its administration is entitled to deference, and inaction by Congress may sometimes be an “indication that Congress does not look unfavorably” upon an administrative regulation, FEC v. Democratic Senatorial Campaign Comm., 454 U.S. 27, 34, 102 S.Ct. 38, 43, 70 L.Ed.2d 23 (1981), reviewing courts "must reject administrative constructions of the statute, whether reached by *1564adjudication or by rulemaking, that are inconsistent with the statutory mandate,” id. at 32, 102 S.Ct. at 42.
. The FEC also appears to argue that it may compel repayment of private funds spent for unqualified purposes because, according to the Commission, the expenditure of private funds causes the candidate to receive "additional public funding," and therefore the use of private money for unqualified purposes is "equivalent” to the use of federal funds (subject to repayment) for those purposes. Unqualified expenditures, however, do not increase federal matching payments to the candidate who incurs them. Federal matching payments do not “restore private campaign funds diverted ... to nonqualified campaign purposes,” 44 Fed.Reg. 20336, nor do they "replenish the pool for the funds which have been paid out," FEC Brief at 18. Neither does a candidate who incurs unqualified expenses "require more public funding to meet his or her qualified expenses.” 44 Fed. Reg. 20336. Rather, the level of federal matching payments to a candidate is determined solely by the level of private "matching contributions” to that candidate. See 26 U.S.C. § 9034(a); 11 C.F.R. § 9034.2. A candidate's entitlement to a given level of public matching funds therefore in no way depends on how much that candidate spends, or whether that spending includes unqualified expenditures. Thus, we do not find this argument at all convincing, because unqualified expenditures do not cause additional federal monies to flow to the candidate’s coffers. We find it considerably difficult to understand, then, why an expenditure, paid out of a pool of funds at least half of which was comprised of private money, should be deemed to have been comprised solely of federal money.
. If the Commission's rationale were valid, all campaign funds could be deemed federal funds on the ground that any expenditure would require more federal funds to "replenish” the campaign's coffers. This result, of course, is absurd and utterly dissolves the distinction, recognized by the statute, see supra at 6-8, between expenses paid out of matching funds and expenses paid out of private contributions.
. If the deficit were smaller than the unqualified expenditures, then this statement would not be true. In such a rare case, the campaign would have run a surplus in the absence of the unqualified expenditure. The government then could have recovered its pro rata share of the resulting surplus. Therefore, the FEC’s rationale would still justify at most a pro rata repayment formula, insofar as the formula looks to the overall "net result” of the unqualified spending. See infra.
. Obviously, since federal matching funds and private contributions are commingled in the campaign fund, the FEC cannot make an absolutely accurate estimate of the amount of matching funds used for unqualified purposes. Members of Congress and a former general counsel to the FEC have recognized, however, that the pro rata surplus repayment formula recovers "all unused funds that [the candidate] got through the Government source as a matching source.” Legislative History of the Federal Election Campaign Act Amendments of 1976 170 (remarks of Sen. Cannon); see id. (remarks of then-General Counsel Murphy of the FEC) (the surplus repayment formula ensures "[Repayment of all of the moneys left over”). It might therefore be reasonable to assume that such a pro rata formula would recover all federal funds spent for unqualified purposes.
However, other considerations particular to the repayment of unqualified expenses might warrant a different administrative approach. For example, the FEC might look to the ratio of federal funds to private contributions in the candidate’s campaign fund at the time the expense was incurred rather than during the entire campaign. On remand, .he Commission may address such questions in the exercise of its expertise and discretion recognized by the Act.