3% personal and 2% Corporate Overpayment Rates
IRS has announced that the interest rates for tax overpayments and underpayments for the calendar quarter beginning Apr. 1, 2013, will remain the same as for the first quarter of 2013.
For noncorporate taxpayers, the rate for both underpayments and overpayments for the second quarter of 2013 will remain unchanged at 3%. The 3% rate also applies to estimated tax underpayments for the second quarter in 2013.
For corporations, the overpayment rate for the second quarter of 2013 will remain at 2%. Corporations will receive .5% for overpayments exceeding $10,000. The underpayment rate for the second quarter of 2013 for corporations will be 3%, but will be 5% for large corporate underpayments.
Interest factors for daily compound interest for annual rates of 0.5% are published in Appendix A of Rev Rul 2012-32.