Originally Posted by swag
[B]But I still need to pay the excess by check. So I'm guessing I send in 4868 anyway (despite what it says), along with the check, is that right? Or is there a different form that I should use?
Yes, that is the only way to get your payment by check posted as a "payment with an extension" (unless you are using software like TaxCut or TurboTax that allows a direct debit to be made with an electronic extension).