A deduction is allowed from a decedent's gross estate of the full unpaid amount of a mortgage upon, or of any other indebtedness in respect of, any property of the gross estate, including interest which had accrued thereon to the date of death, provided the value of the property, undiminished by the amount of the mortgage or indebtedness, is included in the value of the gross estate. If the decedent's estate is liable for the amount of the mortgage or indebtedness, the full value of the property subject to the mortgage or indebtedness must be included as part of the value of the gross estate; the amount of the mortgage or indebtedness being in such case allowed as a deduction. But if the decedent's estate is not so liable, only the value of the equity of redemption (or the value of the property, less the mortgage or indebtedness) need be returned as part of the value of the gross estate. In no case may the deduction on account of the mortgage or indebtedness exceed the liability therefor contracted bona fide and for an adequate and full consideration in money or money's worth. See ยง 20.2043-1. Only interest accrued to the date of the decedent's death is allowable even though the alternate valuation method under section 2032 is selected. In any case where real property situated outside the United States no deduction may be taken of any mortgage thereon or any other indebtedness does not form a part of the gross estate, in respect thereof.
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