Federal Reserve Board – Interest on Reserve Balances

The Federal Reserve Banks pay interest on reserve balances. The Board of Governors has prescribed rules governing the payment of interest by Federal Reserve Banks in Regulation D (Reserve Requirements of Depository Institutions, 12 CFR Part 204). … Federal Reserve issues technical note concerning the calculation of interest rates on required …

https://www.federalreserve.gov/monetarypolicy/reserve-balances.htm