If you itemized deductions on your federal return in the 2019 tax year, then a state refund that you received in 2020 may be taxable. You would enter the amount in the State Tax Refund section of TaxAct®. If you did not itemize on your 2019 federal return, then the state refund would not be taxable to you.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.