The IRS interest rates on overpayments and underpayments for the fourth quarter of 2022 are one percentage point higher than in the third quarter (Rev. Rul. 2022-15). This is the third interest rate increase this year. The rates beginning October 1, 2022, are:
Total business receipts reported on Schedule C or Schedule C-EZ before deducting adjustments for returns and allowances and cost of goods sold.