Using TT for the 2019 state return I had a refund due and I chose to apply all of that 2019 refund to my estimated 2020 state taxes (this 2019 state return was not filed with state until 2021). You are allowed to use state taxes paid (up to $10,000) on schd A as a deduction. My question is: Should that 2019 state tax refund applied to the 2020 state estimated tax be used for a federal schd A deduction on the federal 2020 return or the 2021 federal return (because the 2019 state return was not filed until 2021)? I have not filed either of the federal or state returns for 2020 or 2021.
