You use the same year program. So you use 2019 Premier to amend the 2019 return. But didn't the IRS automatically add them on for you and adjust your 2019 return? They usually catch missing estimates and withholding. I would first double check with the IRS and see if you still have a credit for them.
Do you need to enter the 2020 Estimates now?
To enter Federal or State Estimated Taxes Paid, including a state estimated payment made in January for the prior year, go to
Federal on left or at top. Personal (Home & Business)
Deductions and Credits at top
Then scroll way down to Estimates and Other Taxes Paid
Estimated Taxes - click the Start or Update button
