4137x Apr 2026

About Form 4137, Social Security and Medicare Tax On ... - IRS

: Using IRS Form 4137 fulfills your legal responsibility to report all income and helps avoid IRS audits or penalties . Who Must File About Form 4137, Social Security and Medicare Tax On

: Tips under $20 in a month don't need to be reported to your employer, but they still must be included as income on your Form 1040 . Filing Mechanics About Form 4137

IRS is the tax document used to calculate and report the Social Security and Medicare taxes owed on unreported tip income . This includes cash tips, noncash tips, and "allocated tips" shown in Box 8 of your Form W-2 that were not previously reported to your employer . Core Purpose of Form 4137 About Form 4137, Social Security and Medicare Tax On