Subchapter C - Taxable Amount

26 USC 2621 - Taxable amount in case of taxable distribution

(a) In general 
For purposes of this chapter, the taxable amount in the case of any taxable distribution shall be
(1) the value of the property received by the transferee, reduced by
(2) any expense incurred by the transferee in connection with the determination, collection, or refund of the tax imposed by this chapter with respect to such distribution.
(b) Payment of GST tax treated as taxable distribution 
For purposes of this chapter, if any of the tax imposed by this chapter with respect to any taxable distribution is paid out of the trust, an amount equal to the portion so paid shall be treated as a taxable distribution.

26 USC 2622 - Taxable amount in case of taxable termination

(a) In general 
For purposes of this chapter, the taxable amount in the case of a taxable termination shall be
(1) the value of all property with respect to which the taxable termination has occurred, reduced by
(2) any deduction allowed under subsection (b).
(b) Deduction for certain expenses 
For purposes of subsection (a), there shall be allowed a deduction similar to the deduction allowed by section 2053 (relating to expenses, indebtedness, and taxes) for amounts attributable to the property with respect to which the taxable termination has occurred.

26 USC 2623 - Taxable amount in case of direct skip

For purposes of this chapter, the taxable amount in the case of a direct skip shall be the value of the property received by the transferee.

26 USC 2624 - Valuation

(a) General rule 
Except as otherwise provided in this chapter, property shall be valued as of the time of the generation-skipping transfer.
(b) Alternate valuation and special use valuation elections apply to certain direct skips 
In the case of any direct skip of property which is included in the transferors gross estate, the value of such property for purposes of this chapter shall be the same as its value for purposes of chapter 11 (determined with regard to sections 2032 and 2032A).
(c) Alternate valuation election permitted in the case of taxable terminations occurring at death 
If 1 or more taxable terminations with respect to the same trust occur at the same time as and as a result of the death of an individual, an election may be made to value all of the property included in such terminations in accordance with section 2032.
(d) Reduction for consideration provided by trans­feree 
For purposes of this chapter, the value of the property transferred shall be reduced by the amount of any consideration provided by the transferee.