1. Short title This Act may be cited as the TSP Modernization Act of 2017 . 2. Withdrawal flexibility (a) Post-Separation partial withdrawals Section 8433(c) of title 5, United States Code, is amended— (1) in paragraph (1), by striking and who has not made a withdrawal under subsection (h)(1)(A) may make one withdrawal and inserting may make 1 or more withdrawals ; and (2) by adding at the end the following: (5) Withdrawals under this subsection shall be subject to such other conditions as the Executive Director may prescribe by regulation. . (b) Stopping periodic payments Section 8433(d)(2) of title 5, United States Code, is amended— (1) by striking change an and inserting return a payment that was made under ; and (2) by striking a payment and inserting such payment . (c) Elimination of withdrawal election deadline Section 8433(f) of title 5, United States Code, is amended— (1) by striking (1) Notwithstanding and inserting Notwithstanding ; and (2) by striking paragraph (2). (d) Age-Based in-Service withdrawals Section 8433(h) of title 5, United States Code, is amended— (1) by striking paragraph (2); and (2) by redesignating paragraphs (3), (4), and (5) as paragraphs (2), (3), and (4), respectively. (e) Technical and conforming amendment Section 8432b(h)(2)(A) of title 5, United States Code, is amended by striking section 8433(d), or paragraph (1) or (2) of section 8433(h) and inserting subsection (d) or (f) of section 8433 . (f) Regulations As soon as is administratively feasible, as determined by the Executive Director of the Federal Retirement Thrift Investment Board, the Executive Director shall prescribe regulations to carry out the amendments made by this section. (g) Effective date; applicability The amendments made by this section shall— (1) take effect on the date of enactment of this Act; and (2) apply on and after the effective date of the regulations prescribed under subsection (f).