Payroll tax withholding
Social Security is withheld at 6.2% of gross wages up to the annual Social Security wage base, and Medicare at 1.45%, with an additional 0.9% withheld on wages this employer pays above $200,000 in the year. That $200,000 withholding trigger is fixed by law and is the same for every filing status; the filing-status thresholds ($250,000 married filing jointly, $125,000 married filing separately, $200,000 others) only affect the taxpayer's actual year-end Additional Medicare Tax liability, reconciled on Form 8959, not what gets withheld from a given paycheck. These rates are fixed by statute and do not depend on W-4 elections, so they compute the same way for every user regardless of filing choices.