The employer half of FICA
FICA is charged twice on the same wages. Social Security takes 6.2% from the employee and 6.2% from the employer, up to the annual wage base of $184,500 in 2026; Medicare takes 1.45% from each side with no cap. The employer remits all of it, withholding one half from pay and paying the other half out of the business.
Above the wage base the employer share stops growing, because Social Security applies only to wages under the cap while Medicare continues; the note under the FICA table shows the combined percentage falling as pay rises past that line. Additional Medicare tax of 0.9% applies above $200,000 on a single return and $250,000 joint, the employee pays it alone, and the page has no filing status field, so the employee side is always calculated on the single threshold.