The salary on an offer letter is only part of what an employee costs. On top of gross pay, employers owe matching Social Security and Medicare, federal and state unemployment taxes, workers' compensation premiums, and any benefits they choose to fund. Together these can add 10% to 25% or more to base pay, and the exact figure depends heavily on the work state and salary level.
Federal taxes every employer pays
Employers match the employee's 6.2% Social Security tax up to the annual wage base - $176,100 for 2026 - and the 1.45% Medicare tax on all wages. They also pay federal unemployment (FUTA), which is 6.0% on the first $7,000 of wages but nets to just 0.6% once the standard 5.4% state credit applies. FUTA therefore tops out at only $42 per employee per year.
State taxes vary the most
State unemployment tax (SUTA) is where identical salaries produce very different employer costs. Each state sets its own rate and taxable wage base, and new employers usually start at a default rate. Workers' compensation premiums add further variation by state and by how risky the job classification is, from a fraction of a percent for office work to double digits for high-hazard trades.
Why the cost multiplier matters
Expressing total cost as a multiple of salary - often 1.15x to 1.30x for a typical role - gives a fast planning number for budgeting headcount, setting freelance and contractor bill rates, or comparing the cost of hiring across states. Because Social Security is capped, the multiplier actually shrinks for very high earners, which is worth remembering when modeling senior roles.