How do I pay for my 2017 return. I can't seem to find where and how. I never filed last year

 Online preparation and e-filing for 2017 is permanently closed.  You have to download 2017 software to a full PC or Mac (not to a mobile device) and then print, sign and mail your return.  If you already paid for your TurboTax software, you can contact customer support to push a download of the software to you.

To call TurboTax customer support

https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number

They are available from 5 a.m. to 5 p.m. Pacific time.

To finish a prior year return started in TT online:https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turb

When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s.  Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS and/or your state received the return.

You need to prepare your 2017 tax return using TurboTax CD/Download. You will pay when you purchase the product.

You will need to print and mail this tax return because the IRS does not accept prior years for e-file.

You can pay with check when you mail.

Follow this link for product information: Past Years Products