Rev. Rul. 2021-17: Interest rates, tax underpayments and overpayments (no changes for fourth quarter 2021)

There are no changes from the rates of interest that apply for the first, second, and third quarters 2021.

No changes from the rates of interest that apply for the first, second, and third quarters

The IRS today released an advance version of Rev. Rul. 2021-17 that provides the rates of interest with regard to tax underpayments and tax overpayments for the calendar quarter beginning October 1, 2021 (the fourth calendar quarter of 2021).

There are no changes from the rates of interest that apply for the first, second, and third quarters 2021.

Rev. Rul. 2021-17 [PDF 431 KB] lists the interest rates for the calendar quarter beginning October 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-2021-173