You misunderstood. You cannot pay your state tax due from your federal refund. The only thing you can choose to pay with your federal refund is the fee for using TurboTax to prepare your tax returns. If you choose to do that, you will pay an extra "refund processing fee" of $40 ($45 in CA). If you make that choice, your federal refund goes first to a third party bank. The bank takes out your software fees and pays TurboTax, keeps the $40 for itself, and then sends the rest of the refund to you. To avoid the $40 fee and the involvement of the third party bank, you need to pay your TurboTax fees upfront using a credit or debit card before you e-file.
REMOVE REFUND PROCESSING FEE
https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-account-billing/remove-pay-refund...
And----if you owe tax due to the state:
You must pay your state tax due using the state’s preferred method of receiving payment. For most states that will be by making a payment to the state’s own tax website, or by mailing a check or money order.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/state-taxes/contact-state-department-rev...
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
