on the rates of pay and applicable pay limitations in effect on December 31, 2019, by operation of section 749 of division D of Public Law 116–6 after those rates and pay limitations are increased by 3.1 percent (after applicable rounding). (k) If an employee affected by this section is subject to a biweekly pay period that begins in calendar year 2020 but ends in calendar year 2021, the bar on the employee’s receipt of pay rate increases shall apply through the end of that pay period. (l) For the purpose of this section, the term covered position means a position occupied by an employee whose pay is restricted under this section. (m) This section takes effect on the first day of the first applicable pay period beginning on or after January 1, 2020. 749. (a) None of the funds made available by this or any other Act may be used to administer, implement, or enforce any collective bargaining agreement, or any article or any term of any collective bargaining agreement under chapter 71 of title 5, United States Code, with an effective date after April 30, 2019, that— (1) was not mutually and voluntarily agreed to by all parties to the agreement