The post-judgment interest rate is the weekly average one-year constant maturity Treasury yield for the calendar week preceding the date of entry of the judgment. Effective December 21, 2000, the rate of interest that may be added to a judgment, subject to the provisions of 18 U.S.C. §3612, 28 U.S.C. §1961, and 40 U.S.C. §258(e)(1), shall be equal to the weekly average 1-year constant maturity Treasury yield.
To obtain the most recent rate, the Federal Reserve provides a table of Selected Interest Rates. The applicable rate may be found by scrolling down to the section entitled: "US government securities - Treasury constant maturities - 1-year." The most recent rate is found under the column headed ""Week Ending ____." Historical rate data as published by the Board of Governors of the Federal Reserve System are available by clicking here.