To follow-up on the comments from @MinhT1, the interest that you paid for failing to timely pay the tax when due is not a deductible expense on your 2020 return or your 2021 return. If you are owed a refund on your 2021 tax return, and you have not paid the late interest charges, then the IRS is likely to reduce your refund amount by the amount of the late interest charge.
@poolguy51
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
