(a) In general. Section 903 provides that the term “income, war profits, and excess profits taxes” shall include a tax paid in lieu of a tax on income, war profits, or excess profits (“income tax”) otherwise generally imposed by any foreign country. For purposes of this section and §§1.901-2 and 1.901-2A, such a tax is referred to as a “tax in lieu of an income tax”; and the terms “paid” and “foreign country” are defined in §1.901-2(g). A foreign levy (within the meaning of §1.901-2(g)(3)) is a tax in lieu of an income tax if and only if—
(1) It is a tax within the meaning of §1.901-2(a)(2); and
(2) It meets the substitution requirement as set forth in paragraph (b) of this section.
The foreign country's purpose in imposing the foreign tax (e.g., whether it imposes the foreign tax because of administrative difficulty in determining the base of the income tax otherwise generally imposed) is immaterial. It is also immaterial whether the base of the foreign tax bears any relation to realized net income. The base of the tax may, for example, be gross income, gross receipts or sales, or the number of units produced or exported. Determinations of the amount of a tax in lieu of an income tax that is paid by a person and determinations of the person by whom such tax is paid are made under §1.901-2 (e) and (f), respectively, substituting the phrase “tax in lieu of an income tax” for the phrase “income tax” wherever the latter appears in those sections. Section 1.901-2A contains additional rules applicable to dual capacity taxpayers (as defined in §1.901-2(a)(2)(ii) (A)). The rules of this section are applied independently to each separate levy (within the meaning of §§1.901-2(d) and 1.901-2A (a)) imposed by the foreign country. Except as otherwise provided in paragraph (b)(2) of this section, a foreign tax either is or is not a tax in lieu of an income tax in its entirety for all persons subject to the tax.
(b) Substitution—(1) In general. A foreign tax satisfies the substitution requirement if the tax in fact operates as a tax imposed in substitution for, and not in addition to, an income tax or a series of income taxes otherwise generally imposed. However, not all income derived by persons subject to the foreign tax need be exempt from the income tax. If, for example, a taxpayer is subject to a generally imposed income tax except that, pursuant to an agreement with the foreign country, the taxpayer's income from insurance is subject to a gross receipts tax and not to the income tax, then the gross receipts tax meets the substitution requirement notwithstanding the fact that the taxpayer's income from other activities, such as the operation of a hotel, is subject to the generally imposed income tax. A comparison between the tax burden of this insurance gross receipts tax and the tax burden that would have obtained under the generally imposed income tax is irrelevant to this determination.
(2) Soak-up taxes. A foreign tax satisfies the substitution requirement only to the extent that liability for the foreign tax is not dependent (by its terms or otherwise) on the availability of a credit for the foreign tax against income tax liability to another country. If, without regard to this paragraph (b)(2), a foreign tax satisfies the requirement of paragraph (b)(1) of this section (including for this purpose any foreign tax that both satisfies such requirement and also is an income tax within the meaning of §1.901-2(a)(1)), liability for the foreign tax is dependent on the availability of a credit for the foreign tax against income tax liability to another country only to the extent of the lesser of—
(i) The amount of foreign tax that would not be imposed on the taxpayer but for the availability of such a credit to the taxpayer (within the meaning of §1.901-2(c)), or
(ii) The amount, if any, by which the foreign tax paid by the taxpayer exceeds the amount of foreign income tax that would have been paid by the taxpayer if it had instead been subject to the generally imposed income tax of the foreign country.
(3) Examples. The provisions of this paragraph (b) may be illustrated by the following examples:
(c) Effective date. The effective date of this section is as provided in §1.901-2(h).
[T.D. 7918, 48 FR 46295, Oct. 12, 1983; 48 FR 52033, Nov. 16, 1983]