1. Short title This Act may be cited as the Retirement Inflation Protection Act of 2017 . 2. Indexing of certain assets for purposes of determining gain or loss of eligible individuals (a) In General Part II of subchapter O of chapter 1 of the Internal Revenue Code of 1986 is amended by redesignating section 1023 as section 1024 and by inserting after section 1022 the following new section: 1023. Indexing of certain assets for purposes of determining gain or loss of eligible individuals (a) In general (1) Indexed basis substituted for adjusted basis Solely for purposes of determining gain or loss on the sale or other disposition by an eligible individual of an indexed asset which has been held by such individual for more than 3 years, the indexed basis of the asset shall be substituted for its adjusted basis. (2) Exception for depreciation, etc The deductions for depreciation, depletion, and amortization shall be determined without regard to the application of paragraph (1) to the taxpayer or any other person. (3) Written documentation requirement Paragraph (1) shall apply only with respect to indexed assets for which the taxpayer has written documentation of the original purchase price paid or incurred by the taxpayer to acquire such asset. (b) Eligible individual For purposes of this section, the term eligible individual means, with respect to any indexed asset, any individual if such individual has attained age 59 1/2 as of the date of the sale or other disposition of such asset. (c) Indexed asset (1) In general For purposes of this section, the term indexed asset means— (A) common stock in a C corporation (other than a foreign corporation), or (B) tangible property, which is a capital asset or property used in the trade or business (as defined in section 1231(b)). (2) Stock in certain foreign corporations included For purposes of this section— (A) In general The term indexed asset includes common stock in a foreign corporation which is regularly traded on an established securities market. (B) Exception