How much comes out of your paycheck for Social Security and Medicare

Social Security and Medicare are funded by payroll taxes taken directly from your wages. As an employee, you pay 6.2% of your gross income to Social Security and 1.45% to Medicare. Your employer matches both amounts, so the total going into these programs is double what you see on your pay stub. If you are self-employed, you pay both the employee and employer portions yourself — 12.4% for Social Security and 2.9% for Medicare — though you can deduct half of this on your taxes.

These percentages have been set by federal law since 1983 for Social Security and 1966 for Medicare. They do not change year to year based on inflation or program costs. However, Social Security tax only applies to income up to a certain limit, which does change annually. In 2024, you stop paying Social Security tax once your income reaches $168,600 for the year. Medicare tax, by contrast, has no income cap — you pay 1.45% on every dollar you earn, no matter how much that is.

If you earn more than $200,000 as a single filer (or $250,000 if married filing jointly), an additional 0.9% Medicare tax applies to income above that threshold. This extra tax was added in 2013 and funds the Medicare program directly. Most people do not encounter it, but high earners should know it exists.

Key Takeaways

  • You pay 6.2% of your wages to Social Security and 1.45% to Medicare, with your employer matching both amounts.
  • Social Security tax stops once you reach the annual income cap ($168,600 in 2024), but Medicare tax continues on all earnings.
  • Self-employed workers pay both the employee and employer share, totaling 12.4% for Social Security and 2.9% for Medicare.
  • An additional 0.9% Medicare tax applies to income above $200,000 (single) or $250,000 (married filing jointly).
  • These tax rates are set by federal law and do not change annually, though the Social Security income cap adjusts each year.

Why there is a Social Security income cap but not a Medicare cap

Social Security was designed as an insurance program where benefits are tied to what you paid in. The income cap exists because Social Security benefits are also capped — the maximum monthly benefit in 2024 is around $3,822 for someone who waits until age 70 to claim. Because high earners cannot receive proportionally higher benefits, Congress decided they should not pay tax on income above the cap. This keeps the program's math roughly balanced.

Medicare works differently. It is a defined benefit program, meaning everyone gets the same coverage regardless of how much they paid in. Because benefits do not scale with income, there is no reason to cap the tax. Everyone pays the same percentage on all earnings. The additional 0.9% tax on high earners was added to help shore up Medicare's finances as the program faced longer-term funding challenges.

What happens to the money you pay

The Social Security and Medicare taxes you pay do not go into a personal account with your name on it. Instead, they go into a general trust fund. Social Security taxes fund current retirees' benefits, disability payments, and survivor benefits for families of workers who die. Medicare taxes fund hospital insurance (Part A), which covers inpatient hospital stays, skilled nursing facilities, hospice, and home health care.

When you turn 65 and become may be able to access for Medicare, you do not "cash in" what you paid. Instead, you become part of the pool of people receiving benefits, funded by current workers' taxes. This is why both programs are sometimes called "pay-as-you-go" systems. The money flowing in today pays for today's beneficiaries, not for your own future care.

How to read your pay stub and verify the amounts

Your pay stub should show a line for "Social Security" or "OASDI" (Old-Age, Survivors, and Disability Insurance) and a separate line for "Medicare" or "HI" (Hospital Insurance). The Social Security line should show 6.2% of your gross pay (before any deductions), and the Medicare line should show 1.45%. If you earn above the annual cap, the Social Security deduction will stop appearing partway through the year, but Medicare will continue.

To verify the math yourself, take your gross pay for the period and multiply by 0.062 for Social Security and 0.0145 for Medicare. The result should match what appears on your stub. If the amounts are significantly different, contact your payroll department. Common reasons for discrepancies include pre-tax deductions (like health insurance premiums) that reduce your taxable wages, or an error in how your employer set up your account.

You can also check your lifetime Social Security earnings record by creating an account at ssa.gov. This shows how much you have paid into the system over your entire working life and is the basis for your future benefit amount. Review it every few years to catch any errors — you have a limited window to correct mistakes on your record.

What changes when you retire and start claiming benefits

Once you stop working, you stop paying Social Security and Medicare taxes on wages. However, if you continue to work part-time or are self-employed in retirement, you still pay these taxes on that income. Some retirees are surprised to learn that Social Security benefits themselves are not taxed by the federal government in most cases, though some states do tax them.

When you turn 65, you become may be able to access for Medicare Part A (hospital insurance) automatically if you have paid Medicare taxes for at least 10 years (40 quarters). You do not pay a monthly premium for Part A in most cases. Parts B, D, and supplemental coverage do have monthly premiums that come out of your Social Security check or are billed separately, depending on how you set it up.

How the income cap affects high earners

If you earn significantly more than the annual Social Security cap, you pay a smaller percentage of your total income into Social Security than someone earning less. For example, someone earning $168,600 pays 6.2% on all of it. Someone earning $336,000 pays 6.2% only on the first $168,600, which works out to about 3.1% of their total income. This is intentional — it reflects the program's design as an insurance system rather than a wealth tax.

High earners should plan for this when budgeting. Your Social Security benefit will be capped, so you may want to save additional money for retirement or purchase supplemental insurance. Some high-income workers also benefit from tax-advantaged retirement accounts like 401(k)s and IRAs, which can reduce your taxable income and lower your overall tax burden.

Self-employed workers and quarterly tax payments

If you are self-employed, you pay both the employee and employer share of Social Security and Medicare taxes through quarterly estimated tax payments to the IRS. This totals 15.3% of your net self-employment income (12.4% for Social Security up to the annual cap, plus 2.9% for Medicare). You calculate this using Schedule SE when you file your annual tax return.

Self-employed workers can deduct half of their self-employment tax as a business expense, which reduces their taxable income. This deduction is taken on your Form 1040 and helps offset the fact that you are paying both sides of the tax. If you have questions about how to calculate your quarterly payments, the IRS website has worksheets, or you can work with a tax professional who understands self-employment income.

Frequently Asked Questions

Do I pay Social Security and Medicare taxes on all my income?

Social Security tax applies only to income up to the annual cap ($168,600 in 2024). Medicare tax applies to all income with no cap, plus an extra 0.9% on income above $200,000 (single) or $250,000 (married filing jointly). Pre-tax deductions like health insurance premiums reduce the amount subject to these taxes.

What if I worked in another country — does that count toward my Social Security record?

Generally, only earnings in the United States count toward your Social Security record. However, the U.S. has totalization agreements with about 30 countries that allow workers to combine credits from both countries. Contact the Social Security Administration if you worked abroad to see whether your foreign earnings can be credited.

Can I get a refund of Social Security and Medicare taxes if I did not use the benefits?

No. These taxes fund the current system and cannot be refunded. However, if you paid taxes but did not work long enough to become may be able to access for benefits, you may still be able to claim spousal or survivor benefits based on someone else's record. Contact Social Security to discuss your specific situation.

Do I still pay these taxes if I am receiving Social Security benefits?

If you continue to work while receiving Social Security before your full retirement age, you still pay Social Security and Medicare taxes on your wages. Once you reach full retirement age, you can earn as much as you want without affecting your benefits, but you still pay Medicare tax if you are working.

Why is the Social Security income cap different each year?

The cap adjusts annually based on changes in the national average wage index. This keeps the program's finances stable as wages across the economy change. The Medicare income cap does not adjust — the 0.9% additional tax applies to the same income thresholds ($200,000 and $250,000) every year.