"another 1040-X"
Is this the same 1040-X or a revised No. N based on No. n-1 ?
Sending in the same 1040-X doesn't help to get resolution.
---
Put the unpaid SE into a self-directed Roth IRA.
Inevested properly, it will produce more benefits than relying on future SS benefits which are on the brink of severe reduction if not cancellation.
But you can't because you voided the check.
@hereinhelena
