This bill, titled the "LEO Fair Retirement Act of 2025," aims to amend federal law to allow certain law enforcement officers to include specific premium pay, previously excluded due to statutory limitations, in the computation of their retirement annuities. Currently, federal law enforcement officers often work significant overtime hours for which they are not compensated due to pay caps, and these uncompensated hours do not contribute to their retirement calculations. The legislation seeks to rectify this by enabling the inclusion of such premium pay in the average pay used for calculating annuities under both the Civil Service Retirement System (CSRS) and the Federal Employees Retirement System (FERS). To benefit from this change, a law enforcement officer must make a lump-sum payment to the Office of Personnel Management (OPM) or elect an actuarial annuity reduction . This payment would cover the difference in retirement contributions that would have been made if the premium pay had been included in their basic pay during their highest-earning three consecutive years. The bill also provides a non-refundable personal tax credit for these lump-sum payments. Furthermore, it expands eligibility for availability pay to additional federal employees, including Postal Inspectors, Federal air marshals, and probation officers, deeming them criminal investigators for this purpose. OPM is directed to promulgate regulations within one year to implement these changes, including procedures for officers to make lump-sum payments from their Thrift Savings Fund accounts and for agencies to retain necessary payroll information.