The formulas
- Social Security = 6.2% x min(wages, $184,500)
- Medicare = 1.45% x wages
- Additional Medicare = 0.9% x wages over $200,000 withheld; return liability uses the status threshold
How it works
Tax year: 2026.
Social Security tax is 6.2 percent each for employee and employer on wages up to the 2026 wage base of $184,500. Medicare tax is 1.45 percent each on all wages. Employers must withhold the 0.9 percent Additional Medicare Tax from wages above $200,000 regardless of filing status, with no employer match. The return liability threshold is $250,000 for married filing jointly, $125,000 for married filing separately and $200,000 for others.
The tool shows both the amount withheld and the liability on the return by filing status. The difference is settled on Form 8959.
Illustrative figures only. Check the result against your firm's methodology before relying on it.
Common questions
Is there an employer match on the Additional Medicare Tax?
No. The 0.9 percent is paid by the employee only.
Why can withholding differ from the amount owed?
Employers withhold from the first dollar over $200,000 for everyone, while the return threshold depends on filing status.
Does Medicare have a wage base?
No. All covered wages are subject to Medicare tax.
Sources
- IRS Topic no. 751, Social Security and Medicare withholding rates
- IRS Publication 15 (2026), Employer's Tax Guide
- IRS Publication 505, Tax Withholding and Estimated Tax
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