
844 N.E.2d 438 (2006)
363 Ill. App.3d 999
300 Ill.Dec. 440
David J. SHIELDS, Plaintiff-Appellee,
v.
The STATE EMPLOYEES RETIREMENT SYSTEM OF ILLINOIS, Mark Gallagher, Chairman, The Judges Retirement System of Illinois, Rudy J. Kink, Jr., Manager, Justice Michael Bilandic, Trustee, Justice Thomas Hoffman, Trustee, Justice S. Louis Rathje, Trustee, Judge Donald O'Connell, Trustee, Marvin O. Noven, Trustee, The Board of Trustees of the Judges Retirement System, and James E. Ryan, Attorney General of Illinois, Defendants-Appellants.
No. 1-04-1250.
Appellate Court of Illinois, First District, Fourth Division.
February 16, 2006.
Lisa Madigan, Attorney General, Gary Feinerman, Solicitor General (Jan E. *439 Hughes, Assistant Attorney General, of counsel), for Appellant.
Collins & Bargione, Chicago (George B. Collins, Adrian Vuchovich and James J. Lessmeister, of counsel), for Appellee.
Justice CAMPBELL delivered the opinion of the court:
Defendants, the State Employees Retirement System of Illinois, its chairman, the Judges Retirement System of Illinois (the System), its manager, and its board of trustees (the Board), appeal from an order of the circuit court of Cook County determining that interest must be paid to plaintiff, David J. Shields, on a pension contribution refund determined by the Illinois Supreme Court to have been improperly withheld. On appeal, the Board contends that the circuit court is barred from ordering a state agency to pay postjudgment interest. For the following reasons, we reverse the order of the circuit court.

BACKGROUND
In November 1990, plaintiff, former circuit court judge David J. Shields, then presiding judge of the chancery division of the circuit court of Cook County, applied for retirement benefits from the Judges Retirement System of Illinois, indicating that his service as a judge would terminate on December 3, 1990. At the time of his notice of retirement, Shields had contributed a total of $113,222.04, out of his own funds into the System. Shields began receiving retirement benefits approximating $5,100 per month effective December 13, 1990.
On December 19, 1990, Shields was indicted on seven counts of conspiracy, including charges of extortion, attempted extortion, and knowingly making false statements of material fact to the Federal Bureau of Investigation during the period August 1988 through November 1989. Shields was convicted on all counts of the indictment, and on March 2, 1992, he was sentenced to 37 months in prison plus 3 years of supervised release and was fined $6,000. Shields' conviction was upheld on appeal. United States v. Shields, 999 F.2d 1090 (7th Cir.1993). The district court denied Shields' motion for a new trial and that determination was also upheld on appeal. United States v. Shields, No. 94 1388, 1994 WL 287394 (7th Cir. June 28, 1994).
Following Shields' conviction, Rudy Kink, manager of the System, informed Shields that his benefits would be terminated effective March 2, 1992. Shields sought a refund of all of the contributions he made into the System over the years, totaling $113,222.04. The Board held that Shields was entitled to a refund of $37,873.27, representing his contributions less $75,348.77, benefits paid to him prior to the termination of his benefits. On administrative review, the circuit court, Judge Lester Foreman presiding, reversed the decision of the Board and ordered the System to refund the remainder of Shields' contributions in the amount of $75,348.77, specifically holding:
"`Though it has not been brought to my attention as of this time, I find that he is not entitled to any interest, and the reason he is not entitled to interest is because I think that the way the statute should be interpreted without his ever having made a demand for the interest, I think it would be inappropriate for him to receive it under these circumstances.'" Shields v. Judges' Retirement System of Illinois, 329 Ill.App.3d 27, 31, 263 Ill.Dec. 266, 768 N.E.2d 26 (2001) (Shields I).
The System and the Board appealed, and this court reversed the order of the circuit court. Shields I, 329 Ill.App.3d 27, 263 Ill.Dec. 266, 768 N.E.2d 26.
*440 On Shields' appeal, the Illinois Supreme Court reversed the appellate court, finding that Shields was entitled to a full refund of his contributions. Shields v. Judges' Retirement System of Illinois, 204 Ill.2d 488, 274 Ill.Dec. 424, 791 N.E.2d 516 (2003) (Shields II). The supreme court did not address the issue of interest, but noted that the Board did not originally award interest "since section 18-129© [of the Pension Code (40 ILCS 5/18-129©) (West 1992)] specifically provides that refunds should be computed `without interest.'" Shields II, 204 Ill.2d at 491, 274 Ill.Dec. 424, 791 N.E.2d 516.
On August 27, 2003, the Board issued Shields a check in the amount of $60,813, representing the amount ordered to be refunded, less federal withholding tax, in compliance with the decision of our supreme court.
On August 11, 2003, Shields filed a petition to reinstate his case in the circuit court and enforce his original judgment, seeking interest on $75,348.77, the amount that the circuit court ordered the System to refund to him on November 17, 2000, at the rate or 9% per annum. The Board filed a motion to dismiss the petition pursuant to section 2-619 of the Code of Civil Procedure (735 ILCS 5/2-619 (West 2002)). The trial court specifically found that the Judges Retirement System of Illinois is a government entity under the definition of 2-1303 of the Code of Civil Procedure (735 ILCS 5/2-1303 (West 2002)) and determined that Shields was entitled to interest at the rate of 6% per annum from the time of the judgment entered by Judge Foreman on November 17, 2000, until the date that interest is paid. The trial court subsequently denied the System's motion to reconsider. The defendants' timely appeal followed.

OPINION
The matter before this court is whether Shields is entitled to 6% interest on the judgment awarded to him on November 17, 2000. On appeal from an order entered pursuant to section 2-619 of the Code of Civil Procedure, our review is de novo. Van Meter v. Darien Park District, 207 Ill.2d 359, 368, 278 Ill.Dec. 555, 799 N.E.2d 273, 278 (2003).
Whether Shields is allowed to collect 6% interest on the judgment regarding his contribution toward his pension initially depends on whether the System is a governmental entity under section 2-1303 of the Code of Civil Procedure. Section 2-1303 of the Code of Civil Procedure provides in pertinent part:
"Interest on judgment. Judgments recovered in any court shall draw interest at the rate of 9% per annum from the date of the judgment until satisfied or 6% per annum when the judgment debtor is a unit of local government, as defined in Section 1 of Article VII of the Constitution, a school district, a community college district, or any other governmental entity." (Emphasis added). 735 ILCS 5/2-1303 (West 2002).
Defendants contend that the trial court erred in determining that the System is a governmental entity for the purposes of section 2-1303. Defendants argue that the System is, in fact, a creature of the State, and that the State of Illinois is immune from a suit for postjudgment interest filed under section 2-1303 under the doctrine of sovereign immunity. In a footnote, defendants note that the proper forum for claims against the State is the Court of Claims (see 705 ILCS 505/1 (West 2002)), and that if the legislature intends to waive the State's immunity, it must do so by specific authorization: general legislative enactments do not impair the rights of the sovereign unless an intent to make the *441 State liable is expressed in the statute. City of Springfield v. Allphin, 82 Ill.2d 571, 576, 45 Ill.Dec. 916, 413 N.E.2d 394 (1980); Department of Revenue v. Appellate Court, 67 Ill.2d 392, 396, 10 Ill.Dec. 536, 367 N.E.2d 1302 (1977).
Defendants argue that the language "any other governmental entity" in section 2-1303 has been held to apply only to units of local government, not to arms of the State. The Judges Retirement System is created in section 18-101 of the Illinois Pension Code as follows:
"A retirement system is created to be known as the `Judges Retirement System of Illinois'. It shall be a trust separate and distinct from all other entities, maintained for the purpose of securing the payment of annuities and benefits as prescribed herein." 40 ILCS 5/18-101 (West 2002).
Defendants assert that the above enabling statute does not support the classification of the System as a governmental entity under section 2-1303. In support, defendants cite Williams v. Illinois State Scholarship Comm'n, 139 Ill.2d 24, 150 Ill.Dec. 578, 563 N.E.2d 465 (1990), and In re Special Education of Walker, 131 Ill.2d 300, 137 Ill.Dec. 575, 546 N.E.2d 520 (1989). In Walker, a petitioner sought interest on an unpaid judgment entered by the Illinois State Board of Education (ISBE). Our supreme court held the ISBE did not qualify as a governmental entity, explaining that the "language in section 2-1303 is not a sufficiently clear expression by the legislature to constitute a waiver of the State's immunity," (Walker, 131 Ill.2d at 304, 137 Ill.Dec. 575, 546 N.E.2d 520), and declined to award interest. In Williams, our supreme court reversed an award of interest against the Illinois State Scholarship Commission. Relying on Walker, the court stated: "the State cannot be held accountable for interest in situations where a judgment is entered against government entities that do not qualify as a unit of local government under section 2-1303." Williams, 139 Ill.2d at 73-74, 150 Ill.Dec. 578, 563 N.E.2d 465.
Shields' response to defendants' argument that the System is not a governmental entity pursuant to section 2-1303 is multifaceted. Shields initially argues that article XIII, section 5, of the Illinois Constitution protects pensions. Ill. Const. 1970, art. XIII, § 5 ("Membership in any pension or retirement system of the State, any unit of local government or school district, or any agency or instrumentality thereof, shall be an enforceable contractual relationship, the benefits of which shall not be diminished or impaired"). He argues, without more, that he is entitled to interest pursuant to the Constitution. Shields continues that the System remains liable for interest under section 2-1303 because Judge Foreman's judgment concerns contribution funds as distinguished from pension funds. Shields explains that his contributions held by the System were monies he contributed that were held separate from the State general revenue fund, and, as a result, the System becomes a "governmental entity," exempt from sovereign immunity.
Shields argues that the determining factor of whether sovereign immunity applies is whether state general funds can be reached to satisfy a judgment. In support, Shields cites Gocheff v. State Community College of East St. Louis, 69 Ill.App.3d 178, 25 Ill.Dec. 477, 386 N.E.2d 1141 (1979), as a case in contrast to his case. There, this court held that a state community college was not immune from a personal injury lawsuit, where the employee of the college was fatally injured while driving a vehicle owned by the college. This court reasoned that state funds would *442 not be reachable to satisfy any judgment rendered against the college and that the state board, acting as temporary community college board for the college, possessed a sufficient degree of administrative autonomy to make it amenable to suit. Gocheff, 69 Ill.App.3d at 181-82, 25 Ill.Dec. 477, 386 N.E.2d 1141. Shields argues that his case is distinguishable from Gocheff, as "[t]here is no way Trust assets will be touched and no way the States' [sic] general fund be invaded."
Defendants reply that Shields misunderstands the holding of Gocheff. Defendants cite Jones v. Jones-Blythe Construction Co., 150 Ill.App.3d 53, 103 Ill.Dec. 353, 501 N.E.2d 374 (1986), appeal denied, 114 Ill.2d 546, 108 Ill.Dec. 418, 508 N.E.2d 729 (1987). There, the plaintiff filed a personal injury action against the Teachers' Retirement System as a result of a slip and fall on the premises occupied by the system. The trial court granted the system's motion to dismiss, and this court affirmed, holding that the Teachers' Retirement System is a division of the State within the meaning of the statute granting the Court of Claims exclusive jurisdiction over tort claims against the State. In making its determination, this court relied on section 16-162 of the Pension Code, which provided as follows:
"Payment of the required State contributions and of all pensions, annuities, retirement allowances, death benefits, refunds and other benefits granted under or assumed by this retirement system, and all expenses in connection with the administration and operation thereof, are obligations of the State." Ill.Rev. Stat.1983, ch. 108½, par. 16-162 (now 40 ILCS 5/16-158©) (2002).
This court found that "[a]ny judgment in favor of plaintiff could be considered an expense in connection with the administration and operation of the System and satisfied out of the general funds of the State," and should be brought in the Court of Claims. Jones, 150 Ill.App.3d at 55, 103 Ill.Dec. 353, 501 N.E.2d 374. The court further distinguished Gocheff:
"In Gocheff, the court found that the general funds of the State would not be reachable to satisfy a judgment rendered in the case. * * * [W]e do not believe that the System enjoys the degree of autonomy asserted by plaintiff. The System and its board are created by statute and the powers and duties of the board are controlled by statute." Jones, 150 Ill.App.3d at 54, 103 Ill.Dec. 353, 501 N.E.2d 374.
The statutory provision applicable to the present case is strikingly similar to the provision applicable in Jones:
"The payment of (1) the required State contributions, (2) all benefits granted under this system and (3) all expenses in connection with the administration and operation thereof are the obligations of the Sate to the extent specified in this Article." 40 ILCS 5/18-132 (West 2002).
By analogy, state general funds could be reached to satisfy a judgment against the Judges Retirement System.[1] By further way of analogy, the term "local public entity," which is similar to "governmental entity," is defined in the Local Governmental and Governmental Employees Tort Immunity Act as follows:
"`Local public entity' includes a county, township, municipality, municipal corporation, school district, school board, educational service region, regional *443 board of school trustees, community college district, community college board, forest preserve district, park district, fire protection district, sanitary district, museum district, emergency telephone system board, and all other local governmental bodies. `Local public entity' also includes library systems and any intergovernmental agency or similar entity formed pursuant to the Constitution of the State of Illinois or the Intergovernmental Cooperation Act as well as any not-for-profit corporation organized for the purpose of conducting public business. It does not include the State or any office, officer, department, division, bureau, board, commission, university or similar agency of the State." 745 ILCS 10/1-206 (West 2002).
Thus, we find that the System is a creature of state government and that section 2-1303 does not require the System to remit interest on a judgment entered against it.
Whether interest is payable then depends on whether the statute provides for interest. It is well settled that interest is not recoverable absent a statute or agreement providing for it. City of Springfield v. Allphin, 82 Ill.2d 571, 576, 45 Ill.Dec. 916, 413 N.E.2d 394 (1980); Lakefront Realty Corp. v. Lorenz, 19 Ill.2d 415, 423, 167 N.E.2d 236 (1960); People ex rel. Barrett v. Farmers State Bank, 371 Ill. 222, 224, 20 N.E.2d 502 (1938). Interest statutes, like statutes imposing costs, are in derogation of the common law and must be strictly construed. Nothing is to be read into them by intendment or implication. Allphin, 82 Ill.2d at 577, 45 Ill.Dec. 916, 413 N.E.2d 394, citing Summers v. Summers, 40 Ill.2d 338, 342, 239 N.E.2d 795 (1968). Interest is a creature of statute and cannot be recovered except where a statute authorizes it. Fowler v. Harts, 149 Ill. 592, 597, 36 N.E. 996 (1894).
As recognized by our courts in both Shields I and Shields II, section 18-129 of the Pension Code, entitled "Refund of Contributions; repayment," provides in each subsection that benefits be provided "without interest" regardless of whether payments are being made to a participant, an annuitant, a surviving spouse, or other survivor. See 40 ILCS 5/18-129 (West 2002); Shields II, 204 Ill.2d at 491, 274 Ill.Dec. 424, 791 N.E.2d 516.
Shields argues that "the Trustees are not acting as a sovereign but as any employer that provides a pension" and that "[m]anaging a pension creates a fiduciary obligation to the contributors." Shields continues that the Judges Retirement System is not a creature of the State but is tantamount to "any employer."
While it is undisputed that public employee pensions are a matter of contractual right (Stillo v. State Retirement Systems, 305 Ill.App.3d 1003, 239 Ill.Dec. 453, 714 N.E.2d 11 (1999)), Shields provides no authority for either his argument that the System is not an arm of the State or that interest must be paid on a judgment involving a state pension contribution where the enabling statute specifically provides that interest not be paid. Shields does cite to authority wherein prejudgment or postjudgment interest was paid in situations regarding various units of local government, which are not exempt from the interest statute: Martino v. Police Pension Board of the City of Des Plaines, 331 Ill.App.3d 975, 265 Ill.Dec. 251, 772 N.E.2d 289 (2002); Eddings v. Board of Education of the City of Chicago, 305 Ill. App.3d 584, 238 Ill.Dec. 798, 712 N.E.2d 902 (1999); and Calabrese v. Chicago Park District, 294 Ill.App.3d 1055, 229 Ill.Dec. 377, 691 N.E.2d 850 (1998). All of these cases are easily distinguished as none of them involve the State.
*444 The recently decided case Barry v. Retirement Board of the Firemen's Annuity & Benefit Fund of Chicago, 357 Ill.App.3d 749, 293 Ill.Dec. 740, 828 N.E.2d 1238 (2005), appeal denied, 216 Ill.2d 680, 298 Ill.Dec. 374, 839 N.E.2d 1021 (2005), is similarly distinguishable from the present case. In awarding both prejudgment and postjudgment interest on the claim of a widow of a Chicago firefighter, this court engaged in an analysis to determine whether the firemen's board was a "public body" or a "municipality," ultimately holding that the firemen's board was not a "governmental entity" exempt from interest statutes. The analysis engaged in by the Barry court is not proper here, where the action is against the State and immunity applies. Ellis v. Board of Governors of State Colleges & Universities, 102 Ill.2d 387, 80 Ill.Dec. 750, 466 N.E.2d 202 (1984).
We conclude that the trial court erred in determining that the Judges Retirement System is a governmental entity pursuant to section 2-1303 of the Code of Civil Procedure subject to payment of 6% interest on Shield's contribution refund. We therefore reverse the judgment of the trial court.
Reversed.
QUINN, P.J., concurs.
MURPHY, J., dissents.
Justice MURPHY dissenting:
Upon reviewing the applicable law, and in particular the recent case of Barry v. Retirement Bd. of Firemen's Annuity and Benefit Fund of Chicago, 357 Ill.App.3d 749, 293 Ill.Dec. 740, 828 N.E.2d 1238 (2005), I conclude that Barry governs in the instant case and requires that the System pay Shields post-judgment interest at the rate of 9% upon his pension contribution refund. I therefore respectfully dissent from my learned and respected colleagues.
The majority distinguishes Barry on the basis that the instant "action is against the State and [sovereign] immunity applies." 363 Ill.App.3d at 1006, 300 Ill.Dec. at 446, 844 N.E.2d at 444. However, this takes as a given that which should be the result of a considered analysis by the court: is the System a State agency immune from section 2-1303 post-judgment interest (In re Walker, 131 Ill.2d 300, 137 Ill.Dec. 575, 546 N.E.2d 520 (1989)), a "governmental entity" subject to 6% post-judgment interest, or neither and thus subject to the general post-judgment interest rate of 9%?
In Barry, though section 2-1303 expressly applies 6% post-judgment interest to municipalities, the pension fund of Chicago's municipal fire department was held not to be part of the municipality, and thus subject to 9% interest, because of its very nature as a pension fund.
"[N]either the fund, which the Board characterizes as `an administrative body charged with responsibility of administering retirement and disability benefits for Chicago firefighters and their family members,' nor the Board itself, which actually does administer the firemen's annuity and benefit fund, qualifies as a type of public body which the exemption was intended to protect." Barry, 357 Ill.App.3d at 774, 293 Ill.Dec. 740, 828 N.E.2d 1238.
Distinguishing the firefighters' pension fund from other agencies of local government such as a board of education or a sanitary district, the Barry court stated that:
"The public bodies in McKee and Calumet  the Board of Education and the Sanitary District  were created to benefit the public at large. In contrast to the public bodies in McKee and Calumet, the fund and the Board in the instant case were created, not to benefit *445 the public at large but, rather, to benefit Chicago firefighters and their family members. [Citation.] This fund consists of moneys contributed not only by the City of Chicago but also by the firemen themselves. [Citation.] Indeed, the Board's statutory powers and duties include supervising deductions from the salaries of firemen paid into the fund as well as supervising contributions made by the City of Chicago to the fund. [Citation.] In addition, the Board's powers and duties include investing the money in the fund and authorizing payment of annuities, pensions, and benefits. 40 ILCS 5/6-183, 6-185 (West 2000). We recognize the City of Chicago contributes an amount to the fund which significantly exceeds the amount contributed by the firemen. We note, however, that unlike the money in the budgets of municipal corporations and public bodies, which can be earmarked for specific expenditures which benefit the public at large, the money in the firemen's fund is invested and is used to benefit not the public at large, but firemen and their beneficiaries. [Citation.] Between the death of Mr. Nutter and the date the trial court reversed the Board's denial of duty death benefits to his widow, the Board had control over money to which Nutter was legally entitled and which formed part of a larger fund to which Mr. Nutter had made contributions in the form of deductions from his salary. Furthermore, during this interval of time, the Board had the fiduciary duty to invest this money in the fund on behalf of the firemen and their beneficiaries." Barry, 357 Ill. App.3d at 775-76, 293 Ill.Dec. 740, 828 N.E.2d 1238, citing McKee-Berger-Mansueto, Inc. v. Board of Education of the City of Chicago, 626 F.2d 559 (7th Cir.1980), and Calumet Construction Corp. v. Metropolitan Sanitary District of Greater Chicago, 178 Ill.App.3d 415, 127 Ill.Dec. 581, 533 N.E.2d 453 (1988).
The Barry court affirmed the trial court's application of 9% post-judgment interest because:
"As previously noted, the Board's primary statutory function is to administer a pension fund. In the context of the instant case, we find neither the Board nor the fund performed a governmental function. Accordingly, we find the Board and the fund do not qualify as `governmental entit[ies]' under section 2-1303 of the Code of Civil Procedure." Barry, 357 Ill.App.3d at 780, 293 Ill.Dec. 740, 828 N.E.2d 1238.
As explained below, I see no basis for distinguishing Barry from the instant case and thus find Barry to be dispositive of the issue of post-judgment interest in the instant case. If the pension fund for municipal firefighters is not an agency of the municipality, then the pension fund for state judges is not an agency of the State and not subject to its immunity. Notably, the Barry court considered that public (in that case, municipal) funds were deposited in the firefighters' pension fund but concluded that these deposits were made for the benefit of the firefighters and their beneficiaries rather than for the benefit of the public. Similarly, while State funds are deposited into the System, this is done for the benefit of the judges and their beneficiaries rather than the benefit of the citizenry as a whole.
Under its enabling statute, the "firemen's annuity and benefit fund shall be created, set apart, and maintained, for the benefit of its firemen, their widows, children and parents, and of all contributors to, participants in, and beneficiaries of any firemen's pension fund." 40 ILCS 5/6-140 (West 2002). By comparison, the System's enabling statute is even more explicit about the distinct and separate nature of *446 the System. "A retirement system is created to be known as the `Judges Retirement System of Illinois'. It shall be a trust separate and distinct from all other entities, maintained for the purpose of securing the payment of annuities and benefits as prescribed herein." 40 ILCS 5/18-132 (West 2002).
Also, the Illinois Constitution addresses the pensions of State and local government employees together and without distinction: "Membership in any pension or retirement system of the State, any unit of local government or school district, or any agency or instrumentality thereof, shall be an enforceable contractual relationship, the benefits of which shall not be diminished or impaired." Ill. Const.1970, Art. XIII, § 5.
Lastly, there is a clear statutory path to the applicability of section 2-1303 to the System. Decisions of the System are subject to review under the Administrative Review Law, 735 ILCS 5/3-101 et seq. (West 2002). 40 ILCS 5/18-164 (West 2002). The Administrative Review Law provides in relevant part that the circuit court has the power "in case of affirmance or partial affirmance of an administrative decision which requires the payment of money, to enter judgment for the amount justified by the record and for costs, which judgment may be enforced as other judgments for the recovery of money." 735 ILCS 5/3-111(a)(8) (West 2002). Post-judgment interest under section 2-1303 "merely preserves the value of the liquidated obligation by compensating the judgment creditor for delays in payment." Illinois State Toll Highway Authority v. Heritage Standard Bank & Trust Co., 157 Ill.2d 282, 295, 193 Ill.Dec. 180, 626 N.E.2d 213 (1993). Stated another way, post-judgment interest "is neither a penalty nor a bonus, but instead a preservation of the economic value of an award from diminution caused by delay." Heritage Standard Bank & Trust Co., 157 Ill.2d at 301, 193 Ill.Dec. 180, 626 N.E.2d 213. Moreover, the application of post-judgment interest is mandatory, so that a trial court has no discretion to refrain from imposing post-judgment interest upon a money judgment. Browning, Ektelon Division v. Williams, 348 Ill.App.3d 830, 833, 283 Ill. Dec. 143, 807 N.E.2d 984 (2004). In short, post-judgment interest is directly connected to the enforcement of the judgment, preventing the judgment debtor from benefitting from retention of the money judgment and providing the judgment debtor an incentive to pay the judgment promptly.
Finally, the application of post-judgment interest statute to a refund due from the System is not contrary to the provision in the System's enabling statute that refunds are payable "without interest." 40 ILCS 5/18-129 (West 2002). By comparison, the enabling statute for the firemen's annuity and benefit fund at issue in Barry did not provide for interest-free refunds (40 ILCS 5/18-158 to -162 (West 2002)), and the Barry court found that fund liable for pre-judgment as well as post-judgment interest. It is axiomatic that a contract governs pre-judgment interest while, once the contractual debt is merged into a judgment, the contract ceases to exist and the rate of interest is thereafter controlled by statute. Bank of Pawnee v. Joslin, 166 Ill.App.3d 927, 941, 118 Ill.Dec. 484, 521 N.E.2d 1177 (1988). In light of the fact that a pension of a State or local government employee is "an enforceable contractual relationship" (Ill. Const.1970, Art. XIII, § 5), it is a reasonable interpretation that the System, but not the firefighters' pension fund, was intended by the Assembly to be exempt from paying pre-judgment interest on refunds.
*447 As to the application of the post-judgment interest statute, section 2-1303, this court has stated that:
"An award of interest on a money judgment requires that the amount of money to be paid was certain, and the judgment debtor enjoyed the improper use of the money during the period for which interest is to be awarded." Browning, Ektelon Division, 348 Ill.App.3d at 833, 283 Ill.Dec. 143, 807 N.E.2d 984.
There can be little doubt that both occurred here. The principal amount due Shields, $75,348.77, was fixed and certain under the circuit court judgment of November 17, 2000, as affirmed by the Illinois supreme court,[1] and the System had the use of that money until it paid Shields the principal on August 27, 2003.
Regarding the amount of post-judgment interest due, section 2-1303 provides in relevant part that "[i]nterest shall be computed and charged only on the unsatisfied portion of the judgment as it exists from time to time." 735 ILCS 5/2-1303 (West 2002). Interest is due on a judgment during the pendency of an appeal. Browning, Ektelon Division, 348 Ill.App.3d at 833, 283 Ill.Dec. 143, 807 N.E.2d 984. Also, "where a money award has been modified on appeal and the only action necessary in the trial court is compliance with the mandate of the appellate court, interest on the award should accrue from the original judgment date." Phelps v. O'Malley, 187 Ill.App.3d 150, 157, 135 Ill.Dec. 76, 543 N.E.2d 311 (1989). The statutory language clearly supports the conclusion that interest is due on the principal up to August 27, 2003, when the System paid Shields, and upon that prior interest from August 28, 2003, onward.
Therefore, I would award Shields post-judgment interest (1) on the principal of the refund, $75,348.77, from the judgment of November 17, 2000, until August 27, 2003, and (2) upon the interest described in (1) from August 28, 2003, until the System shall pay Shields in full.
NOTES
[1]  See also People ex rel. Manning v. Nickerson, 184 Ill.2d 245, 234 Ill.Dec. 375, 702 N.E.2d 1278 (1998) (sovereign immunity applied to protect state funds from being reached to satisfy a judgment against the Illinois Department of Conservation).
[1]  The supreme court recently considered again the effect of a felony conviction on pension contributions and benefits, the original underlying issue herein. Taddeo v. Board of Trustees of the Illinois Municipal Retirement Fund, 216 Ill.2d 590, 297 Ill.Dec. 425, 837 N.E.2d 876 (2005). However, Taddeo was limited to the narrow issue of whether a person who held two public offices and committed crimes that affected one office, but not the other, was barred from the pensions for both offices or just the one in which he committed his offenses. The issue of interest was not addressed in Taddeo.
