The Department of the Treasury announced that, for the six-month period of January 1, 2008 to June 30, 2008, the interest rate applicable to the Prompt Payment Act and claims under the Contract Disputes Act is 4 3/4 percent per year. 72 Fed. Reg. 74408 (Dec. 31, 2007). The interest rate for the six-month period ending on December 31, 2007 was 5 3/4 percent per year.