The COVID relief bill passed in 2020 allows up to a 12-month grace period for employees to incur new expenses and submit claims against unused accumulated funds for plan years ending in 2020 or 2021 for healthcare and dependent care FSAs.
Let's say you contributed $5,000 to your Dependent Care FSA, but only spent $3,500 on Dependent Care.
Enter the $5,000 in box 10 on your W-2 (I assume that it is already there) for your 2020 tax return..
Then, when you are asked in the Dependent and Child Care credit section how much you actually spent in 2020, enter the $3,500.
When you enter your tax year 2021 return (i.e., next year), you will be asked if you made any payments from the 2020 FSA funds carried over to 2021. You will enter the $1,500 (or the amount you actually spend from the carryover amount).
TurboTax will complete the form 2441 accordingly.
[Edited 03-15-2021]
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