You can make payment prior to filing. In fact, it's a good idea. Discounts that you see now will expire sometime in early March.
You will not have completed your e-filing until you click on the "Transmit Returns Now" icon. See the TurboTax FAQ below for more explanation.
"How do I e-file my personal (individual) tax return?"
https://ttlc.intuit.com/replies/3301375
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
