How on earth do you pay for TurboTax using a credit card. The only button is using federal refund and that costs an additional 39.99

[Critter]

In the FILE tab step 1 ... choose the pay with CC option ...

[Critter]

Or use the Print center : 

Can I print a copy of my TurboTax Online return BEFORE I file it?

You can, but if you haven't already pre-paid your TurboTax fees (if any), you'll be asked to pay before you can print.

1. If you're not already in your return, sign in at TurboTax.com  and then select Take me to my return.
2. Select Tax Tools and then Print Center from the left-side menu (on mobile devices, tap in the upper left corner to expand the menu).
3. Select the first option, Print, save, or preview this year's return and follow any additional onscreen instructions to pay for the program.
   • If you're using a free version with no add-on fees, you'll be asked to register first.
4. Once your PDF opens in Adobe Acrobat Reader, select the "printer" icon near the top.

1. Make any adjustments in the Print window and then select Print at the bottom.

[mesquitebean]

"The only button is using federal refund and that costs an additional 39.99"

If you are on a payment screen and don't see either a credit card button (which also accepts debit card) or a PAY NOW button in some cases (such as when paying at the Print Center), then see if using a different browser makes a difference.