When an S Corporation dissolves, terminates, or ceases operations, a final tax return must be filed by the 15th day of the 3rd month following the date its tax year ended. While the instructions for the 2019 Form 1120S state the form can be used when filing a short year return which begins and ends in 2020, TaxAct does not support this scenario.
Per the Instructions for Form 1120S, page 12:
File the 2019 return for calendar year 2019 and fiscal years that begin in 2019 and end in 2020. For a fiscal or short tax year return, fill in the tax year space at the top of the form.
The 2019 Form 1120S can also be used if:
The corporation must show its 2020 tax year on the 2019 Form 1120S and take into account any tax law changes that are effective for tax years beginning after December 31, 2019.
Therefore, if the due date of the final tax return falls before the new year's tax forms are released by the IRS, you will need to use the current year's tax forms.
As a possible work around for your particular requirement, you could manually enter any amounts which are affected by 2020 law changes and paper file the return. You will need to verify that the proper amounts are being reported on the 1120S return based on the tax code for 2020 and override those entries that would be changed due to tax law changes (TaxAct will calculate based on the 2019 tax code).
An Alert will be generated which states:
Error or Omission: Invalid Tax Year
An invalid tax year has been entered. The tax year must begin in 2019 and the ending date must be after the beginning date.
This Alert will prevent electronic filing of the return.