Estimated tax payments for 2019 were all paid on time. final payment payed on January 15, 2020. will I be able to get credit for the 2020 payment on my 2019 return?

Yes the January 15 payment can be entered on your 2019 tax return.

To enter, edit or delete estimated taxes paid (Federal, State, Local) -

• Click on Federal Taxes (Personal using Home and Business)
• Click on Deductions and Credits
• Click on I'll choose what I work on (if shown)
• Scroll down to Estimates and Other Taxes Paid
• On Estimates, click on the start or update button

Or enter estimates paid in the Search box located in the upper right of the online program screen. Click on Jump to estimates paid

Or click on Tax Tools on the left side of the screen.
Click on Tools
Click on Topic Search
Type in estimated tax payments, click on GO

Federal estimated taxes paid are entered on Form 1040 Schedule 3 Line 8. The totals for Schedule 3 flow to Form 1040 Line 18d