KAUGER, Justice.
Three questions involving state income tax are presented on appeal: 1) Whether Oklahoma may include “gross up,” as taxable income;1 2) Whether a corporation, [667]*667which has elected to treat payments of foreign income taxes as a credit for federal tax purposes, may deduct such payments from its taxable income under the Oklahoma Income Tax Act, 68 O.S.1981 § 2351, et seq. (Act); and 3) Whether interest should be remitted.
We find: (1) Because the companies were not engaged in a unitary business, taxation of the federal “gross up” violated due process. The “gross up” deduction is within the purview of 68 O.S.1981 § 2358(A)(2),2 which allows a deduction for any amount exempted from taxation on constitutional grounds. (2) There is no constitutional prohibition against including foreign taxes in Oklahoma taxable income and no provision for deduction of foreign taxes within the Act. Corporations choosing to take the federal foreign tax credit, rather than a deduction for foreign taxes paid, must include the amount representing foreign taxes within Oklahoma taxable income. (3) The inclusion of foreign taxes in Oklahoma taxable income has been foreshadowed by case law. The Oklahoma Income Tax Act does not provide for the deduction. The requested remittur of interest is disallowed insofar as the deduction for foreign taxes is concerned. Because tax on the foreign “gross up” was unconstitutional, the interest and the additional assessment of the gross-up amount must be remitted.
STIPULATED FACTS
The parties stipulated to the following facts: The appellant, Flint Resources Company is an Oklahoma corporation domiciled in Oklahoma. Flint Construction Company of South America (South America) is a wholly owned subsidiary of Flint Resources Company. Flint Construction (Construction), a wholly owned subsidiary of South America, was organized under the laws of Venezuela, and domiciled in Venezuela. In 1980 and 1981, Flint Resources was primarily a holding company owning 100% of the stock of South America. During that time, South America was also primarily a holding company owning 100% of the stock of Construction. The only relationship between Construction and South America was that of parent-subsidiary. Construction did not conduct business or perform services in Oklahoma. During the years 1980 and 1981, the activities of South America and Construction did not constitute a unitary business.
Flint Resources, South America, and Kelley Ranch Trust filed consolidated tax returns for the years 1980 and 1981. Construction paid Venezuelan income taxes of $3,792,954 in 1980 and $3,837,961 in 1981. Construction paid dividends of $500,000 and $275,000 to South America during 1980 and 1981. Income taxes were withheld, which were paid to Venezuela in the amounts of $100,000 in 1980 and $55,000 in 1981.
The tax returns for the tax years 1980 and 1981, reflect that Flint Resources elected to take the foreign tax credit for the amount of Construction’s Venezuelan taxes deemed to have been paid by South America as well as for the taxes withheld and paid to Venezuela on the dividends paid to South America. In 1980, Flint Resources’ foreign tax credit amounted to $288,822 and in 1981 it totaled $175,885. Because [668]*668Flint Resources elected to take the foreign tax credit, the corporation was not allowed to deduct the taxes withheld on the dividends paid to South America. Instead, it was required to add a foreign dividend “gross-up” in the amount of $264,533 in 1980, and $190,600 in 1981, as taxable income on its federal returns. Flint Resources reduced the amount of South America’s dividend income by the foreign dividend “gross-up” amounts, and it increased its deduction for taxes paid by $100,000 on its 1980 Oklahoma return and by $48,740 on the 1981 Oklahoma return.
On August 3, 1984, the appellee/Okla-homa Tax Commission (Tax Commission) proposed an additional income tax assessment on Flint Resources and its subsidiaries. The assessment was based on a taxable income figure which included the federal foreign dividend “gross-up” amount for the tax years 1980 and 1981. The assessment disallowed deductions for the income taxes withheld by Venezuela on the dividends paid by Construction to South America. The assessment added $14,581 to the amount of Oklahoma taxes owed for 1980 and $9,574 for 1981. Flint Resources paid the assessed taxes under protest including interest. Flint Resources protested the assessment of additional taxes. After a hearing before an administrative law judge, an order was issued recommending denial of the protest. This order, as supplemented, was affirmed by the Oklahoma Tax Commission en banc. Flint Resources appealed pursuant to 68 O.S.1981 § 225(a).
I
A
TAXATION OF THE FEDERAL “GROSS UP” IS UNCONSTITUTIONAL UNLESS THERE IS A UNITARY RELATIONSHIP BETWEEN AN OKLAHOMA CORPORATION’S FOREIGN SUBSIDIARY AND THE STATE OF OKLAHOMA.
The provisions of the Internal Revenue Code governing foreign tax credits and “gross up” calculations were adopted to relieve taxpayers, within stated limits, of the harsh consequences of double taxation,3 without eliminating federal tax on income from foreign sources. The federal foreign tax credit scheme also precludes a federal taxpayer, who has paid foreign taxes, from taking both a federal tax credit and a deduction for the same expense.4 American multinational corporations are offered two options in computing federal income tax: they may either deduct income taxes paid to a foreign government from taxable income under 26 U.S.C. § 164(a)(3) (1981);5 or they may elect to credit that amount against their tax liability under § 901.6 Pursuant to § 9027 corporations [669]*669utilizing the § 901 credit, receiving dividends from foreign subsidiaries, and owning at least 10% of the voting stock of those subsidiaries, are considered to have paid a portion of the foreign taxes actually paid by their foreign subsidiaries.8 This amount is also treated as a credit against the federal tax due. Section 2759 disallows any deduction for foreign taxes paid if a corporation has chosen the §§ 901, 902 benefits and credits. Generally, it is more advantageous for a domestic corporation to take the foreign tax credit. The credit for taxes deemed paid reduces dollar for dollar the actual federal tax due. The deduction merely reduces taxable income.10 If a domestic corporation elects to take the tax credits afforded by §§ 901 and 902, under 26 U.S.C. § 78 (1981),11 the “gross-up,” must be included in the corporation’s taxable income.
Although the question of state taxation of the federal “gross-up” is one of first impression in Oklahoma, the United States Supreme Court addressed the issue in F. W. Woolworth Co. v. Taxation & Revenue Dept. 458 U.S. 354, 372-73, 102 S.Ct. 3128, 3139, 73 L.Ed.2d 819, 833 (1982), reh’g de[670]*670nied, 459 U.S. 961, 103 S.Ct. 274, 74 L.Ed.2d 213 (1982).
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KAUGER, Justice.
Three questions involving state income tax are presented on appeal: 1) Whether Oklahoma may include “gross up,” as taxable income;1 2) Whether a corporation, [667]*667which has elected to treat payments of foreign income taxes as a credit for federal tax purposes, may deduct such payments from its taxable income under the Oklahoma Income Tax Act, 68 O.S.1981 § 2351, et seq. (Act); and 3) Whether interest should be remitted.
We find: (1) Because the companies were not engaged in a unitary business, taxation of the federal “gross up” violated due process. The “gross up” deduction is within the purview of 68 O.S.1981 § 2358(A)(2),2 which allows a deduction for any amount exempted from taxation on constitutional grounds. (2) There is no constitutional prohibition against including foreign taxes in Oklahoma taxable income and no provision for deduction of foreign taxes within the Act. Corporations choosing to take the federal foreign tax credit, rather than a deduction for foreign taxes paid, must include the amount representing foreign taxes within Oklahoma taxable income. (3) The inclusion of foreign taxes in Oklahoma taxable income has been foreshadowed by case law. The Oklahoma Income Tax Act does not provide for the deduction. The requested remittur of interest is disallowed insofar as the deduction for foreign taxes is concerned. Because tax on the foreign “gross up” was unconstitutional, the interest and the additional assessment of the gross-up amount must be remitted.
STIPULATED FACTS
The parties stipulated to the following facts: The appellant, Flint Resources Company is an Oklahoma corporation domiciled in Oklahoma. Flint Construction Company of South America (South America) is a wholly owned subsidiary of Flint Resources Company. Flint Construction (Construction), a wholly owned subsidiary of South America, was organized under the laws of Venezuela, and domiciled in Venezuela. In 1980 and 1981, Flint Resources was primarily a holding company owning 100% of the stock of South America. During that time, South America was also primarily a holding company owning 100% of the stock of Construction. The only relationship between Construction and South America was that of parent-subsidiary. Construction did not conduct business or perform services in Oklahoma. During the years 1980 and 1981, the activities of South America and Construction did not constitute a unitary business.
Flint Resources, South America, and Kelley Ranch Trust filed consolidated tax returns for the years 1980 and 1981. Construction paid Venezuelan income taxes of $3,792,954 in 1980 and $3,837,961 in 1981. Construction paid dividends of $500,000 and $275,000 to South America during 1980 and 1981. Income taxes were withheld, which were paid to Venezuela in the amounts of $100,000 in 1980 and $55,000 in 1981.
The tax returns for the tax years 1980 and 1981, reflect that Flint Resources elected to take the foreign tax credit for the amount of Construction’s Venezuelan taxes deemed to have been paid by South America as well as for the taxes withheld and paid to Venezuela on the dividends paid to South America. In 1980, Flint Resources’ foreign tax credit amounted to $288,822 and in 1981 it totaled $175,885. Because [668]*668Flint Resources elected to take the foreign tax credit, the corporation was not allowed to deduct the taxes withheld on the dividends paid to South America. Instead, it was required to add a foreign dividend “gross-up” in the amount of $264,533 in 1980, and $190,600 in 1981, as taxable income on its federal returns. Flint Resources reduced the amount of South America’s dividend income by the foreign dividend “gross-up” amounts, and it increased its deduction for taxes paid by $100,000 on its 1980 Oklahoma return and by $48,740 on the 1981 Oklahoma return.
On August 3, 1984, the appellee/Okla-homa Tax Commission (Tax Commission) proposed an additional income tax assessment on Flint Resources and its subsidiaries. The assessment was based on a taxable income figure which included the federal foreign dividend “gross-up” amount for the tax years 1980 and 1981. The assessment disallowed deductions for the income taxes withheld by Venezuela on the dividends paid by Construction to South America. The assessment added $14,581 to the amount of Oklahoma taxes owed for 1980 and $9,574 for 1981. Flint Resources paid the assessed taxes under protest including interest. Flint Resources protested the assessment of additional taxes. After a hearing before an administrative law judge, an order was issued recommending denial of the protest. This order, as supplemented, was affirmed by the Oklahoma Tax Commission en banc. Flint Resources appealed pursuant to 68 O.S.1981 § 225(a).
I
A
TAXATION OF THE FEDERAL “GROSS UP” IS UNCONSTITUTIONAL UNLESS THERE IS A UNITARY RELATIONSHIP BETWEEN AN OKLAHOMA CORPORATION’S FOREIGN SUBSIDIARY AND THE STATE OF OKLAHOMA.
The provisions of the Internal Revenue Code governing foreign tax credits and “gross up” calculations were adopted to relieve taxpayers, within stated limits, of the harsh consequences of double taxation,3 without eliminating federal tax on income from foreign sources. The federal foreign tax credit scheme also precludes a federal taxpayer, who has paid foreign taxes, from taking both a federal tax credit and a deduction for the same expense.4 American multinational corporations are offered two options in computing federal income tax: they may either deduct income taxes paid to a foreign government from taxable income under 26 U.S.C. § 164(a)(3) (1981);5 or they may elect to credit that amount against their tax liability under § 901.6 Pursuant to § 9027 corporations [669]*669utilizing the § 901 credit, receiving dividends from foreign subsidiaries, and owning at least 10% of the voting stock of those subsidiaries, are considered to have paid a portion of the foreign taxes actually paid by their foreign subsidiaries.8 This amount is also treated as a credit against the federal tax due. Section 2759 disallows any deduction for foreign taxes paid if a corporation has chosen the §§ 901, 902 benefits and credits. Generally, it is more advantageous for a domestic corporation to take the foreign tax credit. The credit for taxes deemed paid reduces dollar for dollar the actual federal tax due. The deduction merely reduces taxable income.10 If a domestic corporation elects to take the tax credits afforded by §§ 901 and 902, under 26 U.S.C. § 78 (1981),11 the “gross-up,” must be included in the corporation’s taxable income.
Although the question of state taxation of the federal “gross-up” is one of first impression in Oklahoma, the United States Supreme Court addressed the issue in F. W. Woolworth Co. v. Taxation & Revenue Dept. 458 U.S. 354, 372-73, 102 S.Ct. 3128, 3139, 73 L.Ed.2d 819, 833 (1982), reh’g de[670]*670nied, 459 U.S. 961, 103 S.Ct. 274, 74 L.Ed.2d 213 (1982). The Court held that unless there was a unitary relationship between a corporation’s foreign subsidiary and the taxing state, taxation of “gross-up” violated due process. Other courts considering the issue both before and after Woolworth have reached varying results.12 Nevertheless, the determinative factor has been the existence or nonexistence of a unitary relationship between the taxing state and the corporation.13
Recently, in Matter of Income Tax Protest of Ashland Exploration, Inc., 751 P.2d 1070,1072 (Okla.1988), we defined unitary business. A business is unitary if it operates in more than one state, and if operations conducted in one state benefit or enhance business activities in one or more other states. These activities must be so interdependent and so mutually beneficial that, in effect, they comprise one integral business. Taxation of the federal “gross up” is constitutional if a unitary relationship exists between the taxing state and the domestic corporation’s foreign subsidiary. Otherwise it is unconstitutional because the state has not provided protection, opportunities, or benefits to the corporation for which it can ask for something in return — taxes.14
B
THE FEDERAL “GROSS UP” IS DEDUCTIBLE FROM OKLAHOMA TAXABLE INCOME PURSUANT TO 68 O.S. 1981 § 2358(A)(2).
Title 68 O.S.1981 § 2355(C)15 imposed a 4% tax on the Oklahoma taxable income of corporations doing business within the state or deriving income from sources within the state.16 Oklahoma taxable income is defined as “ ‘taxable income’ as reported ... to the federal government”, subject to federal adjustments.17
“Gross up” is federal taxable income, properly included in the taxable income of an Oklahoma corporation unless some provision of the Oklahoma Act provides for its deduction. Title 68 O.S.1981 § 2358(A)(2) provides for the deduction of any amount from Oklahoma taxable income which the state is either statutorily or con[671]*671stitutionally prohibited from taxing. Because the parties stipulated that Flint Construction Company of South America and Flint Construction, C.A. are not engaged in a unitary business, taxation of the federal “gross up” is unconstitutional. The “gross up” deduction is within the purview of § 2358 which allows a deduction for any amount exempted from taxation on constitutional grounds.
II
FAILURE TO PROVIDE A STATE DEDUCTION FOR FOREIGN TAXES PAID DOES NOT VIOLATE EITHER THE FEDERAL COMMERCE OR DUE PROCESS CLAUSE AND IS NOT VIOLATIVE OF OKLAHOMA’S UNIFORMITY CLAUSE.
When it elected to take the foreign tax credit under 26 U.S.C. § 901 (1981), Flint Resources relinquished its option to deduct from income for federal purposes income taxes paid to foreign governments pursuant to §§ 164(a)(3) and 275(a)(4). Despite its election, Flint Resources now argues that it may deduct from its Oklahoma taxable income, in addition to the federal gross up” amount, taxes paid to Venezuela. It asserts that failure to allow a deduction for foreign taxes paid results in double taxation thus violating the federal constitution’s commerce and due process clauses and Oklahoma’s uniformity clause.18
Taxing statutes should be strictly construed against the state with any ambiguity or doubt resolved in favor of the taxpayer.19 In order for a tax classification to pass constitutional muster, there must be a reasonable classification and reasonable opportunity for uniform or equal incidence upon the class created.20 Here, the broad classification encompasses corporations either doing business within the state or deriving income from within the state. In the absence of arbitrary distinctions, the Fourteenth Amendment does not prevent double taxation.21 Any double taxation arising from Oklahoma’s tax of foreign taxes results not from arbitrary state action, but from a voluntary election to claim the foreign tax credit rather than the deduction from federal taxable income for taxes paid.22
Flint Resources, in misplaced reliance upon Japan Line, Ltd. v. County of Los Angeles, 441 U.S. 434, 444, 99 S.Ct. 1813, 1819, 60 L.Ed.2d 336, 345 (1979), alleges that the commerce clause23 prevents state [672]*672taxation of foreign taxes. In Japan Line, the issue was taxation of instrumentalities of foreign commerce, not a tax on income. The commerce clause does not negate the reserved powers of taxation held by the states.24 Absent federal legislation, state courts need not infer that treatment of foreign income at the federal level mandates identical treatment by the states. Imposition of the commerce clause arises only where the tax either implicates foreign policy issues which must be left to the federal government or violates a clear federal directive.25 There is no indication that a tax which is based on federal taxable income has any impact on foreign policy, and no federal mandate has issued which requires that the tax be excluded from a corporation’s income for state tax purposes. No violation of the commerce clause exists.
Flint Resources last constitutional argument concerns the uniformity clause of the Oklahoma constitution.26 It argues that if a corporation cannot deduct foreign taxes from its state tax return, it is taxed at a higher rate than those corporations which do not take the foreign tax credit and deduct the foreign taxes on their federal returns. Oklahoma’s uniformity clause applies to property taxes only.27 This case raises questions solely regarding corporate income tax, not the direct taxation of property. Hence, Oklahoma’s uniformity clause is not pertinent to this case, and Flint Resources’ argument on this point has no merit.
CORPORATIONS ELECTING TO TREAT PAYMENT OF FOREIGN INCOME TAXES AS A TAX CREDIT FOR FEDERAL TAX PURPOSES MAY NOT CLAIM THOSE PAYMENTS AS A DEDUCTION FROM OKLAHOMA TAXABLE INCOME.
There is no constitutional impediment to taxation of the amount included in Oklahoma taxable income as foreign taxes. Flint Resources acknowledges that the Oklahoma Income Tax Act does not provide for the deduction of foreign taxes. Nevertheless, it contends that because the dividend amount initiating the foreign taxes is included in Oklahoma taxable income, 68 O.S.1981 § 2358(A)(4)(b),28 is applicable. This statute permits an “allowable deduction attributable” to the dividend received Flint Resources asserts that a taxpayer may take the allowable federal deduction even if the taxpayer has taken the foreign tax credit on its federal return. It argues that use of the word “allowable” rather than “allowed” means that permissible federal deductions will be subtracted from [673]*673Oklahoma taxable income even when the deduction has not been utilized for federal purposes.
Flint Resources contends that In re Knosher, 139 Vt. 285, 428 A.2d 1104-06 (1981), is controlling and that failure to allow the deduction would result in taxation of the federal “gross up.” However, in Knosher, the Vermont court construed a state statute which indicated that the Vermont legislature contemplated adjustments to federal taxable income if the state’s taxable income had not been adjusted for federally allowed credits.29 (The Vermont court also had before it a subsequent amendment providing precisely the relief sought by the taxpayer which indicated legislative intent to allow the deduction.)
The rules of statutory construction require that the provisions of 68 O.S.1981 § 2353(3) and (12)30 must be considered with the language of § 2358(A)(4)(b). Subsection 3 provides that all elections shall be identical to federal income tax choices. The word “shall” is usually given its ordinary meaning of “must,” implying a command or mandate.31 Corporate taxpayers electing the foreign tax credit and forfeiting the right to take a deduction for foreign taxes are held to that election under the Oklahoma Income Tax Act. Subsection 12 defines Oklahoma taxable income as taxable income as reported to the federal government, adjusted pursuant to the Internal Revenue Code. It also binds Oklahoma taxpayers in determining the amount of Oklahoma taxable income by elections made at the federal level.
Deductions are a matter of legislative grace rather than judicial intervention.32 The language of § 2353(3) and (12), indicates that the Legislature intended that federal elections be controlling in determining Oklahoma taxable income. The Legislature’s use of the word “allowable” as opposed to “allowed” in § 2358(A)(4)(b) cannot reasonably and harmoniously be construed to mean that Oklahoma taxpayers were intended to have the option under the Income Tax Act to reevaluate federal [674]*674deductions for the purpose of calculating Oklahoma taxable income.33
Ill
INTEREST ON THE FOREIGN TAX SHOULD NOT BE REMITTED WHERE CASE LAW SUPPORTS INCLUSION OF INCOME AND NO STATUTORY PROVISION EXISTS FOR DEDUCTION. HOWEVER, BECAUSE THE TAX ON THE GROSS UP AMOUNT WAS UNCONSTITUTIONAL, THE INTEREST ON IT IS ORDERED REMITTED.
Flint Resources seeks a remittitur of interest on any portion of the disputed tax found to be owing. Title 68 O.S.1981 § 220(a)34 provides that the Tax Commission can waive or remit any penalty or interest where failure to pay the tax is either adequately explained or the failure results from the taxpayer’s mistake of law or fact. The Tax Commission denied the request for remittur after finding no mistake of law existed. The existence of § 220 does not affect this Court’s power to order a remittitur of penalty or interest in an appropriate case. Remitturs have been judicially ordered where failure to pay tax has resulted from a mistake of law or fact.35 However, existing case law from other jurisdictions supported inclusion of foreign taxes in Oklahoma taxable income, and the Oklahoma Act does not provide for the deduction. The remittur of interest on the amount assessed on the proposed deduction for foreign taxes paid is denied. Because the tax on the foreign “gross up” was unconstitutional, the additional assessment on the “gross up” and the interest on the “gross up” is ordered remitted.
AFFIRMED IN PART; REVERSED IN PART.
HARGRAVE, C.J., OPALA, V.C.J., and LAVENDER, DOOLIN and SUMMERS, JJ., concur.
SIMMS, J., concur in result.