I owe taxes from 2020 and paid too much back

[Virtualoo]

I am paying back taxes I owe from the year 2020. What would happen if I accidentally paid too much or overestimated the last payment I make through my payment plan?

Do I get any of it back/Do I have to report it somewhere and how would I do that?

[fanfare]

Continue to make your next regular payment. 

Your balance is lower now and your last payment will be reduced  ( or eliminated if you overpaid a lot).

[rjs]

If you end up paying too much, the IRS will eventually notice the overpayment and send you a refund, without you having to do anything. It might take a few months for that to happen, after you have paid the full balance.