a suggestion for the future. Don't pay by check. if you are registered with the IRS you can set up payment on its website using a checking account, savings account, credit or debit card. the latter two have fees. you can specify the date payment is to be made in advance, still has to be timely, and after finishing you can print a receipt that will serve as proof of timely payment even if it takes the IRS two months to actually take the funds provided there were enough funds available on the date specified.
technically the IRS is supposed to go by the postmark date to check if the payment is timely. i'm not sure if that applies when an office machine is used because the date can be tampered with. You also risk the possibility of the check getting lost in the mail. Even certified mail.
the other thing you can do is specify on a timely filed return - not extended - is direct debit. however, if the return is rejected then and not successfully e-filed until after the due date, I'm not sure if the IRS would charge late payment fees.
if you used Turbotax and the e-file was rejected, you should have gotten a rejection e-mail from Turbotax. depending on your spam filters that could end up in your spam folder.
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you are among many that even though this AGI issue.
