The E-filing deadline for a self-prepared personal 1040 tax return is Oct 15, 2019. If you e-file on Oct 15th and it is rejected by the IRS, then you have until Oct 20th to fix the rejection error and resubmit. If not accepted by the IRS by Oct 20th, then you have no choice but to print, sign and mail the return to the IRS. The Oct 15th deadline for an initial e-fila submission and Oct 20th deadline for s re-submission are "hard" deadlines that will not be extended for any reason and with no exceptions.
Tax professionals using professional tax preparation software for their clients have a hard deadline of Nov 17th that will not be extended for any reason and with no exceptions.
Darn! I lost the website I copied the above from and now can't find it again. I wanted to reference it. I'm sure one of the tax pros out there can do so for me.
