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After you file
"
Normally, I believe deadline of submitting the tax and payment is based on the postmark of the mail.
Does this apply to 1040X as well?
" - yes.
Just for fun, send the 1040X by registered mail (USPS) or by a carrier - see this webpage - and retain the receipt, so that you can prove without any doubt that it was mailed in time.
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‎July 7, 2020
9:36 AM
1,281 Views