I had done the same - had already set up Installment Plan on irs.gov site. When I filed TurboTax kept getting info to set up a plan but finally I saw the option to e-File and checked that I would mail a check by April 15. That allows you to continue to entering Drivers License info for identification and then submit for e-File processing. Message then will confirm transmitting and that IRS will take a few days to confirm being in proper format but you do get confirmation of submitting,
