§ 2106. Taxable estate
(a)
Definition of taxable estate
For purposes of the tax imposed by section
2101, the value of the taxable estate of every decedent nonresident not a citizen of the United States shall be determined by deducting from the value of that part of his gross estate which at the time of his death is situated in the United States-
(1)
Expenses, losses, indebtedness, and taxes
That proportion of the deductions specified in sections
2053 and
2054 (other than the deductions described in the following sentence) which the value of such part bears to the value of his entire gross estate, wherever situated. Any deduction allowable under section
2053 in the case of a claim against the estate which was founded on a promise or agreement but was not contracted for an adequate and full consideration in money or money™s worth shall be allowable under this paragraph to the extent that it would be allowable as a deduction under paragraph (2) if such promise or agreement constituted a bequest.