; (B) the conditions under which the agreement may be terminated before the required period of service is completed and the effect of such termination; (C) the length of the required service period; and (D) any other terms and conditions under which the hiring bonus is payable, subject to the requirements under this section. (3) Form of payment A signing bonus paid to a covered CBP employee under paragraph (1) shall be paid in a single payment after the covered CBP employee completes initial basic training and enters on duty and executed the agreement under paragraph (2). (4) Exclusion of signing bonus from rate of pay A signing bonus paid to a covered CBP employee under paragraph (1) shall not be considered part of the rate of basic pay of the covered CBP employee for any purpose. (5) Effective date and sunset This subsection shall take effect on the date of the enactment of this Act and shall remain in effect until the earlier of— (A) September 30, 2021; or (B) the date on which U.S. Customs and Border Protection has met the requirements under subsections (a) and (b) of section 1141. (c) Retention incentives (1) In general To the extent necessary for U.S. Customs and Border Protection to retain qualified employees, and to the extent necessary to meet the requirements set forth in section 1141, the Commissioner, with the approval of the Secretary, may pay a retention incentive to a covered CBP employee who has been employed with U.S. Customs and Border Protection for a period exceeding 2 consecutive years, and the Commissioner determines that, in the absence of the retention incentive, the covered CBP employee would likely— (A) leave the Federal service