As long as you haven't already mailed your 2017 paper return, you can switch to the e-filing method (through October 15, 2018). Some states now require e-filing their returns, and federal and state returns must be e-filed together.
On the other hand, if you already mailed your return, don't e-file. This can cause problems with the government, including refund delays.
If you wish to change how you'll file your taxes in TurboTax, follow the steps below for TurboTax Online:I efile on Monday and,it was rejected because of,my AGI, i couldn't get to it until today