After you file

In TurboTax Premier, please follow the instruction below:

1. Open your return.
2. Click on Federal Taxes.
3. Click on Deductions & Credits.
4. Scroll down to Estimates and Other Taxes Paid.
5. Click Start next to Other Income Taxes.
6. Click Start next to 2020 refund applied to 2021 federal taxes. 

@Natster