Why isn't my excess social security tax showing on my Schedule 3 when I review my 1040?

It depends on whether the excess withholdings were caused by multiple employers exceeding the maximum or too much being withheld by a single employer.

The excess will appear as a tax credit on Line 11 of your Form 1040, Schedule 3 if the excess withholding is caused by multiple employers exceeding the maximum. 

If one employer withheld too much Social Security tax, you won't be able to take a credit for the excess on your tax return.

Contact your employer and ask them for:

1. A refund for the excess amount, and
2. A corrected W-2 (also called a W-2c) which shows the correct Box 3 and Box 4 amounts.

Do not file with excess withholdings on your return, as you may be subjected to penalties and interest.

Can I get a refund for excess Social Security tax withheld?