No sure that is the same error if I am reading your question correctly. If FICA was deferred, your amounts in in box 4 would have been less than 6.2%. You should not get a warning that excess FICA was withheld. The FICA wage limit was $137,700. Is your box 3 more than that amount? Could you possibly have multiple W2s where the FICA wages total more than 137,700? That would cause you have excess FICA withheld and you would see a credit amount on line 10 of Schedule 3.
You can review your 1040 in the following steps:
- While in your TurboTax account, select Tax Tools in the left margin
- Select Tools
- Select View a Tax Summary
- In the left margin, select Preview my 1040
