26 USC 2107 - Expatriation to avoid tax
A tax computed in accordance with the table contained in section 2001 is hereby imposed on the transfer of the taxable estate, determined as provided in section 2106, of every decedent nonresident not a citizen of the United States if the date of death occurs during a taxable year with respect to which the decedent is subject to tax under section 877 (b).
For purposes of the tax imposed by subsection (a), the value of the gross estate of every decedent to whom subsection (a) applies shall be determined as provided in section 2103, except that
then that proportion of the fair market value of the stock of such foreign corporation owned (within the meaning of section 958 (a)) by such decedent at the time of his death, which the fair market value of any assets owned by such foreign corporation and situated in the United States, at the time of his death, bears to the total fair market value of all assets owned by such foreign corporation at the time of his death, shall be included in the gross estate of such decedent. For purposes of the preceding sentence, a decedent shall be treated as owning stock of a foreign corporation at the time of his death if, at the time of a transfer, by trust or otherwise, within the meaning of sections 2035 to 2038, inclusive, he owned such stock.
A credit of $13,000 shall be allowed against the tax imposed by subsection (a).
The credit allowed under this paragraph shall not exceed the amount of the tax imposed by subsection (a).
The tax imposed by subsection (a) shall be credited with the amount of any estate, inheritance, legacy, or succession taxes actually paid to any foreign country in respect of any property which is included in the gross estate solely by reason of subsection (b).
The credit allowed by subparagraph (A) for such taxes paid to a foreign country shall not exceed the lesser of
In the case of property which is included in the gross estate solely by reason of subsection (b), such propertys proportionate share is the percentage which the value of such property bears to the total value of all property included in the gross estate solely by reason of subsection (b).
The tax imposed by subsection (a) shall be credited with the amounts determined in accordance with subsections (a) and (b) of section 2102. For purposes of subsection (a) of section 2102, sections 2012 and 2013 shall be applied as if the credit allowed under paragraph (1) were allowed under section 2010.
If the Secretary establishes that it is reasonable to believe that an individuals loss of United States citizenship would, but for this section, result in a substantial reduction in the estate, inheritance, legacy, and succession taxes in respect of the transfer of his estate, the burden of proving that such loss of citizenship did not have for one of its principal purposes the avoidance of taxes under this subtitle or subtitle A shall be on the executor of such individuals estate.