Example: A, who makes his returns on the calendar year basis, purchased property in 1941 for $10,000. He subsequently expended $6,000 for improvements. Disregarding, for the purpose of this example, the adjustments required for depreciation, the adjusted basis of the property is $16,000. If A sells the property in 1954 for $20,000, the amount of his gain will be $4,000.
26 C.F.R. §1.1016-2