The US Internal Revenue Service has issued Revenue Ruling 2013-6 with the announcement of the interest rates on tax overpayments and tax underpayments for the calendar quarter beginning 1 April 2013. The rate will remain the same as in the previous calendar quarter.

The interest rates are as follows:

The rates will be 3% for overpayments, 2% in the case of a corporation; 3 percent for underpayments; 5 percent for large corporate underpayments; and 0.5 percent for the portion of a corporate overpayment exceeding $10,000. However Revenue Ruling 2013-6 also includes interest factors for daily compound interest for an annual rate of 0.5% and tables with the overpayment and underpayment interest rates for prior periods. Annual interest rate tables for prior periods were also issued.