Missouri - Retroactive Refund for Head of Household Due to Tax Cut and Jobs Act
I received a letter from the Missouri DoR stating that, due to a review of Section 143.161.2 RSMo, and the fact that I filed as Head of Household from 2018-2021, I will be receiving a refund that will also be retroactively applied for the previous 4 years.
The letter seems to say, and I am assuming, that if I file for tax year 2022, I will receive the refund for the previous years (2018-2021) as an additional credit on my 2022 refund.
Am I reading this right? Will the amount that I should be retroactively refunded be added to my 2022 state refund with no additional action on my part? Or do I need to state this amount somewhere on my 2022 state taxes, and/or amend those years in order to receive the amount on the letter? Or is the extra credit handled by TurboTax, noted on my 2022 tax forms, and I am just that tax-dumb (this year's estimated state refund is higher by close to the amount stated on the letter, so me just being tax-dumb might just be the case)?
FYI - I have already placed the $1,400 deduction on Line 15 of Form MO-1040.
Edit: I changed the year from 2017 to 2018, because the Tax Years being retroactively refunded are 2018-2021, not 2017-2021 as I originally wrote.