Sandy4042, here is a suggestion that may work. [I am using the Deluxe CD version.]
If you filed 2020 timely on or before May 17, 2021 and did not timely request a Form 4868 extension which included a 2020 tax payment made after April 15, 2021, any 2020 overpayment that you directed be applied to 2021 should be included as part of the amount in Line 11, col. a.
If you did not select Box D (or C or E), TT may be ignoring Form 2210, Part III (Penalty Computation). You may need to return to Other Tax Situations/Additional Tax Payments/Underpayment Penalties and review information you previously inputted. Check 'yes' for Tax Withholding by Quarter and input actual 2021 withholding. [Remember: even if withholding tax was the same for each pay period throughout the year, tax amounts withheld from 1/1 through 4/15 are usually greater than the other quaters because the first quarter contains 105 days. This is especially true if you are paid weekly.]
When you finish this step-by-step input, go to Forms/Tax Payments and review the Tax Payments Worksheet to see if TT tax payments agree with yours. Line 6 of this Worksheet should include the 2020 overpayment that was applied to 2021. If incorrect, right click the appropriate Line 6 box and see if you can 'override' with the correct amount. The amount in line 6 (Federal) is a 2021 estimated tax payment that, based on information you provided in earlier posts, should be part of the amount in Line 11a of Form 2210, along with any other 2021 actual estimated tax and withholding payments made from January 1 through April 15, 2021.
Then review Forms/Form 2210, Line 11 amounts to see if they coincide with the Tax Payments Worksheet.
Hope this works.
