KAUGER, Justice.
The issues presented are: 1) whether a municipality which contracts with the Oklahoma Tax Commission for the collection of municipal taxes under the authority of 68 O.S.Supp.1986 § 27021 is entitled to interest earned by taxes deposited in the State Treasury; and 2) if the municipality is entitled to investment interest, whether it may [1289]*1289recover interest deposited to the state’s general revenue fund. We find that: 1) the interest earned on municipal sales tax revenues is an accretion or increment to the principal tax. Pursuant to the Okla. Const, art. 10, § 19, the total i.e., principal and interest, must be expended for the purpose levied; and 2) because the fund representing interest earned on the investment of the municipal sales taxes has been appropriated, it is not recoverable.2
FACTS
Under a contract executed pursuant to 68 O.S.Supp.1986 § 2702, the appel-lee/Oklahoma Tax Commission (Tax Commission) collects sales taxes for the ap-pellee/City of Oklahoma City (City). The tax revenues are deposited with the State Treasurer in the Tax Commission’s revolving fund3 where they are comingled with other tax collections. The State Treasurer invests the monies under the guidelines of 62 O.S.1981 § 89.2.4 Title 62 O.S.1981 § 2035 requires that the interest earned from these investments be deposited in the general revenue fund. The State Treasurer holds the municipal taxes for approximately thirty days. On the tenth of each month, the Tax Commission remits munici[1290]*1290pal sales taxes collected for the previous month.6 After deducting the contractual retention fee of 1 ½% allowed by § 2702, the Tax Commission disburses the entire amount collected to the City. However, the Tax Commission does not pay the City interest on the taxes collected; and there is no evidence in the record concerning the amount of interest earned by the Treasurer’s investment of the sales tax.
The City filed a declaratory judgment action on September 2, 1986, seeking to establish its right to interest earned on the investment of the sales taxes. The City also asked that the Tax Commission and State Treasurer be enjoined from appropriating and withholding the interest. On September 24, 1986, the Tax Commission filed a motion to dismiss, which was granted, without prejudice to refiling, on November 5, 1986. Thereafter, the City filed an amended petition asserting that the Okla. Const., art. 10, § 19, prohibited the Tax Commission from retaining interest earned from investment of the sales taxes. The City alleged that the Tax Commission breached the contract by retaining more than 1 ½% of the municipal sales tax revenues as specified in the contract; that it permitted the commingling of municipal revenues with State revenues; that it violated the State Constitution by converting the interest or accretion to principal which belonged to the City to State purposes; that it failed to negotiate interest even though demand was made; and that it breached a fiduciary duty to the City by keeping improper records.
On January 15, 1987, the Tax Commission filed a motion to dismiss the amended petition with prejudice, and on February 5, 1987, the trial court sustained the Tax Commission’s motion finding that the amended petition failed to state a claim for breach of contract. The Court of Appeals reversed the trial court, holding that because the interest was an accretion to the principal, the City was entitled to interest earned by investment of the tax revenues. The Court of Appeals also characterized the Tax Commission as a “vendor” and determined that the collected tax was deemed to be held in trust for the City.7 We granted certiorari on November 8, 1989 to address a question which presents a significant question of public interest.
[1291]*1291I
THE INTEREST EARNED ON MUNICIPAL SALES TAX REVENUES IS AN ACCRETION OR INCREMENT TO THE PRINCIPAL TAX. PURSUANT TO THE OKLA. CONST. ART. 10, § 19, THE TOTAL — PRINCIPAL AND INTEREST — MUST BE EXPENDED FOR THE PURPOSE LEVIED.
The Tax Commission asserts that interest earned by investment of municipal sales taxes can be spent for purposes other than those for which the taxes were levied. The City, relying on the Okla. Const. art. 10, § 19, counters that because the interest earned by investment of the tax revenues is an accretion to the principal, the interest must be used for the same purpose as the tax. The disposition of the question— whether the interest earned on municipal sales tax revenues follows the principal — is controlled by the Okla. Const. art. 10, § 19 which provides:
Every act enacted by the Legislature, and every ordinance and resolution passed by any county, city, town, or municipal board or local legislative body, levying a tax shall specify distinctly the purpose for which said tax is levied, and no tax levied and collected for one purpose shall ever be devoted to another purpose.
On certiorari, the Tax Commission cites Application of State of Oklahoma Bldg. Bonds Comm’n, 202 Okla. 454, 214 P.2d 934, 937-38 (1950) to support its position that art. 10, § 19 is applicable only to the tax revenues, and not to the interest income earned thereon. We do not agree. Oklahoma Bldg. Bonds involved an original proceeding for approval and issuance of state bonds devoted to the upkeep of state buildings. A protest had been filed concerning the authority of the State Treasurer to invest state monies in the bonds. This Court found that the purchase of the bonds with public monies was for investment purposes; and that the investment was not a diversion of the funds, or a use for a purpose other than that for which the monies were collected. The issue presented here — whether interest earned on a tax levy is an accretion or increment of the investment which must be expended for the same purpose as the levied tax — was not involved.
The City has consistently maintained that art. 10, § 19 and Independent School Dist. No. 1 v. Board of County Comm’rs, 674 P.2d 547, 550 (Okla.1983), govern. In Independent School Dist., we held that under 70 O.S.1981 § 6918 interest earned on the investment of school funds must be deposited to a school district account. The Tax Commission attempts to distinguish Independent School Dist. on the basis that a specific statute dictated that the interest follow the principal invested. We would be inclined to agree had the Court not also rested its decision on a broader and more fundamental basis, the Oklahoma Constitution. In Independent School Dist., we noted the rule of law that, absent a special statutory provision, interest is an accretion or increment to the principal fund earning it.9 Recognition of the rule was premised on the mandate of art. 10, § 19 that taxes [1292]*1292levied and collected for one purpose may not be devoted to another purpose. We recognized in Independent School Dist. that, even in absence of a special statutory provision, interest earned from taxes earmarked for a specific purpose must follow the principal.
Here, the interest from municipal taxes earmarked for use by Oklahoma City is being diverted to the state’s general revenue fund. The teaching of Independent School Dist. is that the interest becomes a part of the principal tax.
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KAUGER, Justice.
The issues presented are: 1) whether a municipality which contracts with the Oklahoma Tax Commission for the collection of municipal taxes under the authority of 68 O.S.Supp.1986 § 27021 is entitled to interest earned by taxes deposited in the State Treasury; and 2) if the municipality is entitled to investment interest, whether it may [1289]*1289recover interest deposited to the state’s general revenue fund. We find that: 1) the interest earned on municipal sales tax revenues is an accretion or increment to the principal tax. Pursuant to the Okla. Const, art. 10, § 19, the total i.e., principal and interest, must be expended for the purpose levied; and 2) because the fund representing interest earned on the investment of the municipal sales taxes has been appropriated, it is not recoverable.2
FACTS
Under a contract executed pursuant to 68 O.S.Supp.1986 § 2702, the appel-lee/Oklahoma Tax Commission (Tax Commission) collects sales taxes for the ap-pellee/City of Oklahoma City (City). The tax revenues are deposited with the State Treasurer in the Tax Commission’s revolving fund3 where they are comingled with other tax collections. The State Treasurer invests the monies under the guidelines of 62 O.S.1981 § 89.2.4 Title 62 O.S.1981 § 2035 requires that the interest earned from these investments be deposited in the general revenue fund. The State Treasurer holds the municipal taxes for approximately thirty days. On the tenth of each month, the Tax Commission remits munici[1290]*1290pal sales taxes collected for the previous month.6 After deducting the contractual retention fee of 1 ½% allowed by § 2702, the Tax Commission disburses the entire amount collected to the City. However, the Tax Commission does not pay the City interest on the taxes collected; and there is no evidence in the record concerning the amount of interest earned by the Treasurer’s investment of the sales tax.
The City filed a declaratory judgment action on September 2, 1986, seeking to establish its right to interest earned on the investment of the sales taxes. The City also asked that the Tax Commission and State Treasurer be enjoined from appropriating and withholding the interest. On September 24, 1986, the Tax Commission filed a motion to dismiss, which was granted, without prejudice to refiling, on November 5, 1986. Thereafter, the City filed an amended petition asserting that the Okla. Const., art. 10, § 19, prohibited the Tax Commission from retaining interest earned from investment of the sales taxes. The City alleged that the Tax Commission breached the contract by retaining more than 1 ½% of the municipal sales tax revenues as specified in the contract; that it permitted the commingling of municipal revenues with State revenues; that it violated the State Constitution by converting the interest or accretion to principal which belonged to the City to State purposes; that it failed to negotiate interest even though demand was made; and that it breached a fiduciary duty to the City by keeping improper records.
On January 15, 1987, the Tax Commission filed a motion to dismiss the amended petition with prejudice, and on February 5, 1987, the trial court sustained the Tax Commission’s motion finding that the amended petition failed to state a claim for breach of contract. The Court of Appeals reversed the trial court, holding that because the interest was an accretion to the principal, the City was entitled to interest earned by investment of the tax revenues. The Court of Appeals also characterized the Tax Commission as a “vendor” and determined that the collected tax was deemed to be held in trust for the City.7 We granted certiorari on November 8, 1989 to address a question which presents a significant question of public interest.
[1291]*1291I
THE INTEREST EARNED ON MUNICIPAL SALES TAX REVENUES IS AN ACCRETION OR INCREMENT TO THE PRINCIPAL TAX. PURSUANT TO THE OKLA. CONST. ART. 10, § 19, THE TOTAL — PRINCIPAL AND INTEREST — MUST BE EXPENDED FOR THE PURPOSE LEVIED.
The Tax Commission asserts that interest earned by investment of municipal sales taxes can be spent for purposes other than those for which the taxes were levied. The City, relying on the Okla. Const. art. 10, § 19, counters that because the interest earned by investment of the tax revenues is an accretion to the principal, the interest must be used for the same purpose as the tax. The disposition of the question— whether the interest earned on municipal sales tax revenues follows the principal — is controlled by the Okla. Const. art. 10, § 19 which provides:
Every act enacted by the Legislature, and every ordinance and resolution passed by any county, city, town, or municipal board or local legislative body, levying a tax shall specify distinctly the purpose for which said tax is levied, and no tax levied and collected for one purpose shall ever be devoted to another purpose.
On certiorari, the Tax Commission cites Application of State of Oklahoma Bldg. Bonds Comm’n, 202 Okla. 454, 214 P.2d 934, 937-38 (1950) to support its position that art. 10, § 19 is applicable only to the tax revenues, and not to the interest income earned thereon. We do not agree. Oklahoma Bldg. Bonds involved an original proceeding for approval and issuance of state bonds devoted to the upkeep of state buildings. A protest had been filed concerning the authority of the State Treasurer to invest state monies in the bonds. This Court found that the purchase of the bonds with public monies was for investment purposes; and that the investment was not a diversion of the funds, or a use for a purpose other than that for which the monies were collected. The issue presented here — whether interest earned on a tax levy is an accretion or increment of the investment which must be expended for the same purpose as the levied tax — was not involved.
The City has consistently maintained that art. 10, § 19 and Independent School Dist. No. 1 v. Board of County Comm’rs, 674 P.2d 547, 550 (Okla.1983), govern. In Independent School Dist., we held that under 70 O.S.1981 § 6918 interest earned on the investment of school funds must be deposited to a school district account. The Tax Commission attempts to distinguish Independent School Dist. on the basis that a specific statute dictated that the interest follow the principal invested. We would be inclined to agree had the Court not also rested its decision on a broader and more fundamental basis, the Oklahoma Constitution. In Independent School Dist., we noted the rule of law that, absent a special statutory provision, interest is an accretion or increment to the principal fund earning it.9 Recognition of the rule was premised on the mandate of art. 10, § 19 that taxes [1292]*1292levied and collected for one purpose may not be devoted to another purpose. We recognized in Independent School Dist. that, even in absence of a special statutory provision, interest earned from taxes earmarked for a specific purpose must follow the principal.
Here, the interest from municipal taxes earmarked for use by Oklahoma City is being diverted to the state’s general revenue fund. The teaching of Independent School Dist. is that the interest becomes a part of the principal tax. Because art. 10, § 19 prohibits the diversion of such taxes, the interest earned on municipal sales tax revenues is properly attributable to the municipality levying the tax.
The Tax Commission also argues that Independent School Dist. is not applicable because the interest is not an accretion to principal if legislation provides for the separation of the interest from the principal. The Tax Commission contends that 62 O.S. 1981 § 203 10 requires that interest earned on average daily bank balances be deposited to the general revenue fund. However, if § 203 is interpreted to require that a tax levied for municipal purposes be diverted to state coffers, it contravenes art. 10, § 19. Such an interpretation would render the statute unconstitutional.
Whenever possible, statutes will be interpreted to avoid constitutional conflict. If a statute is susceptible of two constructions — one which will uphold the statute, and one which will strike it down— it is our duty to apply constitutional construction.11 All reasonable doubt is applied in favor of the statute’s validity.12 Where necessary, details are supplied to avoid in-terminability in legislative drafting.13 Article 10, § 19 was enacted as a limitation on the use of the revenue collected under any taxing law — state or municipal.14 It was designed to prevent concealment of the purpose of a tax levy and to prohibit the improper use of a fund pledged for a certain purpose.15 Section 203 was originally part of an act providing for the disposition of unclaimed monies.16 When two other sections of the act were repealed in 1941, § 203 was retained. Section 203 has been part of the legislative scheme since 1919. Apparently, when § 2702 was enacted in 1965, the Legislature either failed to anticipate that the interest on taxes levied for municipal purposes would be deposited in state coffers pursuant to § 203, or it intended § 203 to be inapplicable to taxes levied for a specific purpose. The problem is not one of language analysis because of an unclear norm but rather one of a lacuna, a non-existent norm — a gap in the law.17 The gap is closed, and the statute is saved by excluding interest on taxes expendable for a specific purpose pursuant to art. 10, § 19.
[1293]*1293The finding that § 203 is inartfully drawn rather than unconstitutional is supported by the Legislature’s recent amendment of 68 O.S.Supp.1986 § 2702,18 and its enactment of a new law providing for the establishment of “sales tax remitting accounts.”19 The Legislature amended § 2702 effective November 1, 1989.20 The amended statute provides for all sales taxes, including penalties and interest, collected on behalf of a municipality to be deposited in a sales tax remitting account. House Bill 1330, codified as 68 O.S.Supp.1989 § 1373, provides for the creation of the sales tax remitting account. Section 3 of House Bill 1330 now provides for the distribution of the proportionate amount of interest earned to municipalities on a monthly basis.
The Tax Commission implies in its petition for certiorari that if the City has a [1294]*1294valid claim to interest as an accretion to principal, it is against the State Treasurer, and to require the payment of interest on municipal tax collections would “strike to the heart of the State’s fiscal integrity.” This argument is unpersuasive because of the Legislature’s amendment of § 2702 and its enactment of 68 O.S.Supp.1989 § 1373. Additionally, absent a contract executed in accordance with 68 O.S.Supp.1986 § 2702, the revenues from municipal taxes would never be deposited in the state treasury; and there would be no dispute over entitlement to the interest earned. It would belong to the municipality investing the tax. At the end of any contract term, Oklahoma City or any other municipality could elect not to contract for these services. The argument that the state’s fiscal health depends upon an appropriation of the interest is unconvincing. Furthermore, adoption of this holding need not disrupt the state treasury’s machinery. The machinery to set up an individual account for the deposit of. municipal tax revenues existed before the Legislature’s intervention. Title 62 O.S. Supp.1989 § 7.2 provides for a Special Agency Account Board with the authority to approve the establishment of agency special accounts in the official depository of the state treasury. Such an account could be utilized to segregate municipal tax monies entering the state system. Interest on these accounts could then be paid to the appropriate municipality as part of the monthly disbursal.21
II
INTEREST MAY NOT BE RECOVERED IF THE MONIES FOR WHICH AN ACCOUNTING IS SOUGHT HAVE BEEN APPROPRIATED.
We agree with the Tax Commission’s assertion that the City cannot recover interest earned on investment of the municipal sales taxes if those monies have been appropriated and disbursed.22 Revenues deposited to the general revenue fund are allocated monthly on a percentage basis to the appropriate state agency.23 If any funds remain in the fund at the end of the fiscal year, that amount is placed in the state treasury’s sinking fund.24 One might logically assume from this scheme that any interest earned on the investment of municipal sales taxes has been appropriated. Prior to the trial court’s dismissal, the Tax Commission, in its answer to the City’s petition, denied having information sufficient to disclose an applicable interest rate, dollar amount, or number of deposit days involved. It also denied having knowledge [1295]*1295of whether a fund representing interest earned was being held by the State Treasurer. However, the issue has been resolved by the State Treasurer’s response to our show cause order in City of Oklahoma City v. State, 789 P.2d 1300 (Okla.1990). The State Treasurer reports that all funds have been appropriated to the Constitutional Reserve Fund. Because any funds representing interest earned on the investment of municipal sales taxes have been appropriated, they may not be recovered.
CONCLUSION
Interest obtained from investment of municipal taxes is a part of those proceeds. Utilization of that interest for a purpose other than that for which the taxes are levied is inconsistent with art. 10, § 19. Problems in accounting do not justify depriving owners of their funds.25 However, .all monies representing interest earned from the investment of municipal sales taxes have been appropriated. There is no fund from which the interest earned can be recovered. Therefore, although the cause is reversed, there is no remedial action which could be taken on remand.
CERTIORARI GRANTED; OPINION OF THE COURT OF APPEALS VACATED; REVERSED.
HODGES, LAVENDER, DOOLIN, and SUMMERS, JJ., concur.
HARGRAVE, C.J., OPALA, V.C.J., and SIMMS, J., dissent.