Social Security wage cap
Each employer applies the Social Security wage base independently. If combined 2026 Social Security wages from two or more employers exceed $184,500, the employee may claim qualifying excess withholding on the federal return. If one employer alone overwithheld, that employer should correct it.
This guide addresses ordinary employee Social Security withholding, not self-employment tax, household employment, railroad retirement, or a common-paymaster arrangement. Use each Form W-2 and the current return instructions.
The employee Social Security rate is 6.2% and the 2026 wage base is $184,500, so the ordinary maximum employee tax is $11,439. Medicare does not use this wage cap. A new employer generally cannot rely on wages paid by an unrelated prior employer when deciding when its own Social Security withholding stops.
If both Forms W-2 show wages subject to Social Security tax, total wages are $200,000. At 6.2%, the two employers could withhold $12,400 in total. Subtract the $11,439 annual maximum: the potential excess is $961. The employee checks the Form 1040 instructions and W-2 box 4 amounts before claiming the credit.
If a single employer withheld above the applicable maximum, IRS Topic 608 says the employee cannot simply treat it as the multi-employer income-tax credit. Ask the employer to adjust the overcollection; Form 843 may be the next route if it is not corrected.
Unrelated employers may each withhold correctly based on their own payroll while the combined total exceeds the annual limit. That is the situation generally reconciled on the employee's return.
Do not include Medicare tax in the capped amount, confuse W-2 box 3 wages with box 4 tax, or assume the second employer should stop based only on a pay stub from the first.
Official sources checked 2026-09-03: IRS Topic 608, IRS Publication 15 (2026), and SSA contribution and benefit base.