§ 2642. Inclusion ratio
(a)
 Inclusion ratio defined 
For purposes of this chapter—
(1)
 In general 
Except as otherwise provided in this section, the inclusion ratio with respect to any property transferred in a generation-skipping transfer shall be the excess (if any) of 1 over—
(2)
 Applicable fraction 
For purposes of paragraph (1), the applicable fraction is a fraction—
(A)
the numerator of which is the amount of the GST exemption allocated to the trust (or in the case of a direct skip, allocated to the property transferred in such skip), and
(3)
 Severing of trusts 
(A)
 In general 
If a trust is severed in a qualified severance, the trusts resulting from such severance shall be treated as separate trusts thereafter for purposes of this chapter.
(B)
 Qualified severance 
For purposes of subparagraph (A)—
(i)
In general
The term “qualified severance” means the division of a single trust and the creation (by any means available under the governing instrument or under local law) of two or more trusts if—
(ii)
Trusts with inclusion ratio greater than zero
If a trust has an inclusion ratio of greater than zero and less than 1, a severance is a qualified severance only if the single trust is divided into two trusts, one of which receives a fractional share of the total value of all trust assets equal to the applicable fraction of the single trust immediately before the severance. In such case, the trust receiving such fractional share shall have an inclusion ratio of zero and the other trust shall have an inclusion ratio of 1.
(b)
 Valuation rules, etc. 
Except as provided in subsection (f)—
(1)
 Gifts for which gift tax return filed or deemed allocation made 
If the allocation of the GST exemption to any transfers of property is made on a gift tax return filed on or before the date prescribed by section 
6075
(b) for such transfer or is deemed to be made under section 
2632
(b)(1) or (c)(1)—
(A)
the value of such property for purposes of subsection (a) shall be its value as finally determined for purposes of chapter 12 (within the meaning of section 
2001
(f)(2)), or, in the case of an allocation deemed to have been made at the close of an estate tax inclusion period, its value at the time of the close of the estate tax inclusion period, and
(2)
 Transfers and allocations at or after death 
(A)
 Transfers at death 
If property is transferred as a result of the death of the transferor, the value of such property for purposes of subsection (a) shall be its value as finally determined for purposes of chapter 11; except that, if the requirements prescribed by the Secretary respecting allocation of post-death changes in value are not met, the value of such property shall be determined as of the time of the distribution concerned.
(3)
 Allocations to inter vivos transfers not made on timely filed gift tax return 
If any allocation of the GST exemption to any property not transferred as a result of the death of the transferor is not made on a gift tax return filed on or before the date prescribed by section 
6075
(b) and is not deemed to be made under section 
2632
(b)(1)—
(4)
 QTIP trusts 
If the value of property is included in the estate of a spouse by virtue of section 
2044, and if such spouse is treated as the transferor of such property under section 
2652
(a), the value of such property for purposes of subsection (a) shall be its value for purposes of chapter 11 in the estate of such spouse.
(c)
 Treatment of certain direct skips which are nontaxable gifts 
(1)
 In general 
In the case of a direct skip which is a nontaxable gift, the inclusion ratio shall be zero.
(2)
 Exception for certain transfers in trust 
Paragraph (1) shall not apply to any transfer to a trust for the benefit of an individual unless—
(A)
during the life of such individual, no portion of the corpus or income of the trust may be distributed to (or for the benefit of) any person other than such individual, and
(d)
 Special rules where more than 1 transfer made to trust 
(1)
 In general 
If a transfer of property is made to a trust in existence before such transfer, the applicable fraction for such trust shall be recomputed as of the time of such transfer in the manner provided in paragraph (2).
(2)
 Applicable fraction 
In the case of any such transfer, the recomputed applicable fraction is a fraction—
(4)
 Similar recomputation in case of certain late allocations 
If—
(A)
any allocation of the GST exemption to property transferred to a trust is not made on a timely filed gift tax return required by section 
6019, and
the applicable fraction for such trust shall be recomputed as of the time of such allocation under rules similar to the rules of paragraph (2).
(e)
 Special rules for charitable lead annuity trusts 
(1)
 In general 
For purposes of determining the inclusion ratio for any charitable lead annuity trust, the applicable fraction shall be a fraction—
(2)
 Adjusted GST exemption 
For purposes of paragraph (1), the adjusted GST exemption is an amount equal to the GST exemption allocated to the trust increased by interest determined—
(f)
 Special rules for certain inter vivos transfers 
Except as provided in regulations—
(1)
 In general 
For purposes of determining the inclusion ratio, if—
(B)
the value of such property would be includible in the gross estate of such individual under chapter 11 if such individual died immediately after making such transfer (other than by reason of section 
2035),
any allocation of GST exemption to such property shall not be made before the close of the estate tax inclusion period (and the value of such property shall be determined under paragraph (2)). If such transfer is a direct skip, such skip shall be treated as occurring as of the close of the estate tax inclusion period.
(2)
 Valuation 
In the case of any property to which paragraph (1) applies, the value of such property shall be—
(A)
if such property is includible in the gross estate of the transferor (other than by reason of section 
2035), its value for purposes of chapter 11, or
(B)
if subparagraph (A) does not apply, its value as of the close of the estate tax inclusion period (or, if any allocation of GST exemption to such property is not made on a timely filed gift tax return for the calendar year in which such period ends, its value as of the time such allocation is filed with the Secretary).
(3)
 Estate tax inclusion period 
For purposes of this subsection, the term “estate tax inclusion period” means any period after the transfer described in paragraph (1) during which the value of the property involved in such transfer would be includible in the gross estate of the transferor under chapter 11 if he died. Such period shall in no event extend beyond the earlier of—
(g)
 Relief provisions 
               	 	
               	 	
(1)
 Relief from late elections 
(A)
 In general 
The Secretary shall by regulation prescribe such circumstances and procedures under which extensions of time will be granted to make—
Such regulations shall include procedures for requesting comparable relief with respect to transfers made before the date of the enactment of this paragraph.
(B)
 Basis for determinations 
In determining whether to grant relief under this paragraph, the Secretary shall take into account all relevant circumstances, including evidence of intent contained in the trust instrument or instrument of transfer and such other factors as the Secretary deems relevant. For purposes of determining whether to grant relief under this paragraph, the time for making the allocation (or election) shall be treated as if not expressly prescribed by statute.
(2)
 Substantial compliance 
An allocation of GST exemption under section 
2632 that demonstrates an intent to have the lowest possible inclusion ratio with respect to a transfer or a trust shall be deemed to be an allocation of so much of the transferor’s unused GST exemption as produces the lowest possible inclusion ratio. In determining whether there has been substantial compliance, all relevant circumstances shall be taken into account, including evidence of intent contained in the trust instrument or instrument of transfer and such other factors as the Secretary deems relevant.