26 U.S. Code § 2653 - Taxation of multiple skips
Except as provided in paragraph (2), the provisions of subsection (a) shall not affect the inclusion ratio determined with respect to any trust. Under regulations prescribed by the Secretary, notwithstanding the preceding sentence, proper adjustment shall be made to the inclusion ratio with respect to such trust to take into account any tax under this chapter borne by such trust which is imposed by this chapter on the transfer described in subsection (a).
If the generation-skipping transfer referred to in subsection (a) involves the transfer of property from 1 trust to another trust (hereinafter in this paragraph referred to as the “pour-over trust”), the inclusion ratio for the pour-over trust shall be determined by treating the nontax portion of such distribution as if it were a part of a GST exemption allocated to such trust.
Written determinations for this section
These documents, sometimes referred to as "Private Letter Rulings", are taken from the IRS Written Determinations page; the IRS also publishes a fuller explanation of what they are and what they mean. The collection is updated (at our end) daily. It appears that the IRS updates their listing every Friday.
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