Interest for additional taxes based on 2022 amendment

[Taxes_Are_Fun]

Based on the amended tax return for 2022, I should've received less federal refund for 2022. How should I pay the difference back to IRS? Is it in the next year (2025) filing or as part of this amendment filing? Will IRS apply any penalty or interest for all 3 years for this additional tax?

[CatinaT1]

You will make your payment with the amendment. The IRS will add interest back to the due date of the original return. You will likely get a bill in the future for the interest.

[Taxes_Are_Fun]

Thank you! And in case of overpayment in 2022, would IRS pay interest to me?

[CatinaT1]

Yes, they would! They will also send you a 1099-INT so you can claim that interest as income.