My wife won a contest with winnings reported on a 1099. I have filed my 2019 taxes already, but is there a way to get a 1040-ES filled out automatically post filing?

[markleroy]

We need to pay estimated taxes in 2020 for these winnings to avoid penalties.  I tried stepping through the 1040-ES on my own, but was hoping that there was a way to have turbo tax do it even after filing my taxes.

[JamesG1]

Once you have dropped your original income tax return in the mailbox or sent it off electronically, you can no longer change that return.

If you want to make changes after the original tax return has been filed, you must file an amended tax return.  You may be able to start the amendment process and then select Federal / Other Tax Situations /  Other Tax Forms / Form W-4 and Estimated Taxes.

You would want to have a paper copy of your tax returns handy and make sure that you make no other changes to the tax returns

Or, the 1040-ES is available here if you want to make manual calculations.