IRS Interest Rates
IRS Interest Rates currently may be revised on a quarterly basis.
IRS Interest Rates for individuals are the same for both underpayments (IRS interest rates for late payments) and overpayments of tax.
IRS Interest Rates for corporations is a little more complex. In general, the underpayment rate is the same as it is for individuals, and the overpayment interest rate is 1 percentage point lower. For large corporations, the IRS underpayment rate is 2 percentage points higher than the individual rate. For corporate overpayments that exceed $10,000, the interest rate is 2.5 percentage points lower than the individual rate.
For more information about how IRS interested is computed, you can go to the home page for the IRS Interest & Penalty Calculator.
Current IRS Interest Rates are as follows:
Historical IRS Interest Rates
The most current published IRS Interest Rates can be viewed as a pdf file.
Old IRS Interest Rate Revenue Rulings:
2015 Quarter 3
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