(a) General rule. A deduction is allowed the estate of a decedent dying on or after July 1, 1955, under section 2053(d) for the amount of any estate, succession, legacy, or inheritance tax imposed by and actually paid to any foreign country, in respect of any property situated within such foreign country and included in the gross estate of a citizen or resident of the United States, upon a transfer by the decedent for charitable, etc., uses described in section 2055, but only if (1) the conditions stated in paragraph (b) of this section are met, and (2) an election is made in accordance with the provisions of paragraph (c) of this section. The determination of the country within which property is situated is made in accordance with the rules contained in sections 2104 and 2105 in determining whether property is situated within or without the United States. See section 2014(f) and § 20.2014-7 for the effect which the allowance of this deduction has upon the credit for foreign death taxes.

(b) Condition for allowance of deduction. (1) The deduction is not allowed unless either—

(i) The entire decrease in the Federal estate tax resulting from the allowance of the deduction inures solely to the benefit of a charitable, etc., transferee described in section 2055, or

(ii) The Federal estate tax is equitably apportioned among all the transferees (including the decedent's surviving spouse and the charitable, etc., transferees) of property included in the decedent's gross estate.

(2) For purposes of this paragraph, the Federal estate tax is considered to be equitably apportioned among all the transferees (including the decedent's surviving spouse and the charitable, etc., transferees) of property included in the decedent's gross estate only if each transferee's share of the tax is based upon the net amount of his transfer subjected to the tax (taking into account any exemptions, credits, or deductions allowed by Chapter 11). See examples (2) through (5) of paragraph (e) of § 20.2053-9.

(c) Exercise of election. The election to take a deduction for a foreign death tax imposed upon a transfer for charitable, etc., uses shall be exercised by the executor by the filing of a written notification to that effect with the Commissioner of internal revenue in whose district the estate tax return for the decedent's estate was filed. An election to take the deduction for foreign death taxes is deemed to be a waiver of the right to claim a credit under a treaty with any foreign country for any tax or portion thereof claimed as a deduction under this section. The notification shall be filed before the expiration of the period of limitation for assessment provided in section 6501 (usually 3 years from the last day for filing the return). The election may be revoked by the executor by the filing of a written notification to that effect with the Commissioner at any time before the expiration of such period.

(d) Amount of foreign death tax imposed upon a transfer. If a foreign death tax is imposed upon the transfer of the entire part of the decedent's estate subject to such tax and not upon the transfer of a particular share thereof, the foreign death tax imposed upon a transfer for charitable, etc., uses is deemed to be an amount, J, which bears the same ratio to K (the amount of the foreign death tax imposed with respect to the transfer of the entire part of the decedent's estate subject to such tax) as M (the value of the charitable, etc., transfer, reduced as provided in the next sentence) bears to N (the total value of the properties, interests, and benefits subjected to the foreign death tax received by all persons interested in the estate, reduced as provided in the last sentence of this paragraph). In arriving at amount M of the ratio, the value of the charitable, etc., transfer is reduced by the amount of any deduction or exclusion allowed with respect to such property in determining the amount of the foreign death tax. In arriving at amount N of the ratio, the total value of the properties, interests, and benefits subjected to foreign death tax received by all persons interested in the estate is reduced by the amount of all deductions and exclusions allowed in determining the amount of the foreign death tax on account of the nature of a beneficiary or a beneficiary's relationship to the decedent.