If i've already completed my return but need to switch the payment method how do i do that quickly?

As long as you haven't filed yet (or you e-filed but got rejected), you can change your refund method.

1. Open your return in TurboTax.
2. Go to the File section in the left menu.
3. Next to Step 2: Your refund info select Revisit.
4. Choose your desired refund method and select Continue.

Unfortunately, once your e-filed return has been accepted or you already mailed it, it's too late to change your refund.

There's one exception: if you chose to apply this year's refund to next year's taxes, you can request a check refund instead.