With TurboTax Online, the fee for the state is for using TurboTax to prepare your state tax return. The fee is the same whether you e-file or file by mail. There is no additional fee for e-filing.

It may depend on which version of TurboTax you purchased.

With TurboTax Deluxe, there is no charge to fill out a single state, it is included in the purchase price.  E-filing the Federal form is free, no extra cost. It does cost extra to e-file the state, $25. There is no extra cost if you mail your state form.

Good luck!

@robinrockinsd 

teresainboise is talking about the CD/Download TurboTax software, but the tag on your question indicates that you are using TurboTax Online. The pricing structures are different.