If you have a balance due on your federal return and you have e-filed, then a payment voucher, 1040V will print along with your mailing instructions. Please follow the print and mail instructions below that pertain to the type of software your using.
Follow the directions below when using TurboTax CD/Download software.
https://ttlc.intuit.com/replies/3401365
Follow the directions below when using TurboTax Online.
https://ttlc.intuit.com/replies/3401713