Assistance please:

1) Client (over 60) withdrew $60,000 from pension during 2020.

2) Client filed 2020 tax return and paid taxes on the $60,000 distribution.

3) Client now wishes to repay the $60,000 in 2021, and amend her 2020 tax return to collect refund.

Specifically, when filing the 1040X, where/how do I show the repayment on the 8915-E, 1099-R or

8606 (?). 

I want it to be clear to the IRS that the $60,000 was repaid in the current year.

Thank you!

Anthony