If my return indicates tax due, when is the latest I may file my return and make payment to have both considered timely?

E-filings showing no liability will be considered timely filed if submitted no later than 11:59 p.m. Eastern Standard Time on the actual due date of the return.  A timely filed return will not equate to a timely paid liability if the return is accompanied by an e-payment and submitted later than 5:30 p.m. Eastern Standard Time on the due date.

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