The IRS has begun to pay out interest on all refunds that they issued after 4/15/2020. If you have already received your refund, you will receive the interest in a separate transaction from the IRS. Alternatively, the IRS will include the interest as an additional amount in your refund check or direct deposit. The interest is calculated from 4/15/2020 through the date of payment. The interest rate is 5% from 4/15/2020 to 6/30/2020 and 3% from 7/1/2020 to 9/30/2020.