Rev. Rul. 2021-6: Interest rates, tax underpayments and overpayments (second quarter 2021)

Interest rates on tax underpayments, overpayments

The IRS today released an advance version of Rev. Rul. 2021-6 that provides the rates of interest with regard to tax underpayments and tax overpayments for the calendar quarter beginning April 1, 2021 (the second calendar quarter of 2021).


There are no changes from the rates of interest that apply for the first quarter 2021.

Rev. Rul. 2021-6 [PDF 292 KB] lists the interest rates for the calendar quarter beginning April 1, 2021, as follows:

  • 3% for overpayments (2% for corporations)
  • 0.5% for the portion of a corporate overpayment exceeding $10,000
  • 3% for underpayments
  • 5% for large corporate underpayments

Read a related IRS release—IR-2021-50

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