26 C.F.R. § 1.1012-2
Transfers in part a sale and in part a gift
For rules relating to basis of property acquired in a transfer which is in part a gift and in part a sale, see §§ 1.170A-4(c), 1.1011-2(b), and § 1.105-4.
For rules relating to basis of property acquired in a transfer which is in part a gift and in part a sale, see §§ 1.170A-4(c), 1.1011-2(b), and § 1.105-4.