If you have transferred your 2020 tax return information to your 2021 return, there may be a connection with the end of the 12-month date you used then. Verify that last years 12 month period ended before August 20, 2021, and not after.
You can claim any eligible medical expenses if they occurred in a 12-month period that ends in the current tax year. After you enter your medical expenses, TurboTax will prompt you to choose your 12-month claim period.
For example, the oldest medical expense that you can claim on your 2021 return is an expense from January 2, 2020, using a claim period of January 2, 2020, to January 1, 2021.
You can use a different 12-month period each year--the period doesn’t have to start where your previous 12-month period ended. However, you can't claim the same expenses more than once.
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