How can I start on my 2020 return? I need to know if I need to make an estimated payment on September 15?

[DoninGA]

Tax year 2020 will not complete until after 12/31/2020. 

The TurboTax software for tax year 2020 will not be available until November 2020 for the desktop editions and in December 2020 for the online editions.

Estimated tax payments for 2020 can be calculated using the worksheets in the IRS Form 1040-ES - https://www.irs.gov/pub/irs-pdf/f1040es.pdf

Federal tax payments can be made on the IRS payment website - https://www.irs.gov/payments

[Critter-3]

2020 estimates are computed using the 2019 program ... log back in and scroll down and click on ADD A STATE to open the archived return ... 

1. With your tax return open, search for 1040-es (be sure to include the dash) and select the Jump to link.
2. Answer No to the question Do you want to change your W-4 withholdings for 2020?
3. Answer the questions about things like your 2020 filing status, income, and deductions.
4. Eventually, you'll come to the Print Vouchers? screen. Answer Yes and we'll include your 2020 1040-ES payment vouchers when you print a copy of your return later.