The amount on Line 25c can come from several places.
According to Line 25c -- Other Forms in the Form 1040 (2022) Instructions:
Include on line 25c any federal income tax withheld on your Form(s) W-2G. The amount withheld should be shown in box 4. Attach Form(s) W-2G to the front of your return if federal income tax was withheld.
If you had Additional Medicare Tax withheld, include the amount shown on Form 8959, line 24, in the total on line 25c. Attach Form 8959.
Include on line 25c any federal income tax withheld that is shown on a Schedule K-1.
Also include on line 25c any tax withheld that is shown on Form 1042-S, Form 8805, or Form 8288-A. You should attach the form to your return to claim a credit for the withholding.
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