The IRS has announced that the interest rates applicable to overpayments and underpayments of federal taxes for the fourth quarter of 2019 are the same as for the third quarter of the year (Rev. Rul. 2019-21). The rates 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.