I repaid a significant pension plan overpayment on June 2 2020. The overpayment 1099R was in my 2019 tax return. If I haven't received a tax form from the pension plan can I file an amended return before the July 15. I do have proof of payment to the pension plan. A copy of the check, tracking info, proof the check was cashed, and a copy of the overpayment letter demanding repayment.
