Relating to the administration of, contributions to, and benefits under retirement systems for firefighters in certain municipalities.

HB 4873 amends definitions related to retirement systems for firefighters in Texas cities with populations between 450,000 and 500,000. It adds new terms like "actuarial accrued liability" and "amortization rate" to clarify how retirement fund benefits, contributions, and funding calculations are determined. The bill directly affects firefighters in those specific municipalities by establishing standardized definitions for future retirement system administration. This definitional change is a procedural step, not a policy implementation, and it is currently in committee referral after being filed in March 2025.