The IRS interest rates on overpayments and underpayments for the second quarter of 2023 are the same as the rates for the first quarter of 2023 (Rev. Rul. 2023-4). The rates beginning April 1, 2023, are:
A tax technique for receiving a refund of back taxes by applying a deduction or credit from a current tax year to a prior tax year. For example, a business net operating loss may be carried back for two years.