FYI ... you can file now and pay later if you like. You don't need to wait to file at all.
There is no way to reflect the payment of the balance due on the return. If you pay now and file later the fed/state will marry up the payment with the return ... you do NOT do this on the return. It is not needed and is not possible. So if your return is ready to go then just file it now.
If you want to pay now when filing an extension THEN AND ONLY THEN would the return show a zero balance due because you paid with the filing of the extension however since you don't want to DD but wish to pay online directly this is a big waste of time and effort.
