; and (4) in section 5547(a), by inserting 5545c, after 5545a, . (c) Effective date The amendments made by this section shall be effective on the first day of the first applicable pay period beginning on or after October 1, 2023. (d) Clerical amendments The table of sections for chapter 55 of title 5, United States Code, is amended by— (1) amending the item relating to section 5544 to read as follows: 5544. Wage-board overtime, Sunday rates, and other premium pay. ; and (2) inserting after the item relating to section 5545b the following new item: 5545c. Incident standby premium pay for employees engaged in wildland firefighting. . 4. Special limitations on pay for wildland firefighters (a) In general Title 5, United States Code, is amended— (1) by inserting after section 5547 the following: 5547a. Special limitations on premium pay for employees engaged in wildland firefighting (a) In this section— (1) the term covered employee means an employee of the Forest Service or the Department of the Interior who— (A) qualifies as a wildland firefighter based on the definitions of firefighter and wildland firefighter in section 5332a(a); or (B) is certified by the applicable agency to perform wildland fire incident related duties during the period such employee is assigned to a qualifying incident; (2) the term covered services means services performed by an employee that are determined by the Secretary of the Interior or the Secretary of Agriculture, as applicable, to primarily involve emergency wildfire suppression activities, including any periods of duty when the employee is sleeping or resting during an extended period of deployment to engage in those activities; (3) the term emergency wildland fire suppression activities means initial-response and extended-response activities that directly relate to suppression of a wildfire, including activities associated with a severity incident but excluding activities associated with a prescribed fire incident (as those terms are defined section 5545c)