Your employer and you both pay into Social Security with every paycheck

Social Security is funded by payroll taxes — money taken directly from your wages and matched by your employer. If you work as an employee, you see this as the "Social Security tax" or "OASDI" line on your pay stub. The amount is the same whether you earn $30,000 a year or $168,600 a year (the 2024 wage cap), though earnings above that cap are not taxed for Social Security.

If you are self-employed, you pay both the employee and employer share yourself, which is why self-employment tax feels steeper. Either way, the money goes into a single federal trust fund that pays benefits to current retirees, disabled workers, and survivors of workers who have died.

Key Takeaways

  • Employees and employers each pay 6.2 percent of wages into Social Security, up to the annual wage cap of $168,600 (2024).
  • Self-employed workers pay 12.4 percent total (both shares) on net earnings from self-employment.
  • The payroll tax has been the same rate since 1990, though Congress can change it by law.
  • You build a Social Security record only when you or your employer pay into the system; volunteer work and unpaid caregiving do not count toward benefits.
  • The trust fund that pays benefits is separate from general income tax and is not part of the federal budget.

How the payroll tax rate is set and when it changes

Congress sets the Social Security tax rate by law. The current rate of 6.2 percent for employees (and 6.2 percent for employers) has been in place since 1990. Before that, the rate rose gradually throughout the 1980s as part of a 1983 reform that was meant to keep the system solvent for decades.

The rate does not change automatically. If Congress wants to raise or lower it, they must pass new legislation. There is no mechanism that adjusts the tax rate year to year based on the trust fund's balance or life expectancy changes, even though both of those factors affect how long the current revenue will cover all promised benefits.

The wage cap and why high earners pay less in total

In 2024, you pay Social Security tax only on the first $168,600 of your annual wages. Any income above that is not subject to the payroll tax. This means a person earning $200,000 pays the same total Social Security tax as someone earning $168,600 — the difference in their paychecks does not go into the system.

The wage cap is adjusted each year based on national average wage growth. It was $160,200 in 2023 and $168,600 in 2024, so it typically rises by a few thousand dollars annually. This cap affects how much you can earn in covered wages, which in turn affects the maximum benefit you can receive when you claim.

Self-employed workers and the full payroll tax burden

If you work for yourself, you pay both the employee share (6.2 percent) and the employer share (6.2 percent) on your net self-employment income — a total of 12.4 percent. You can deduct half of this self-employment tax when you file your income tax return, which provides some offset, but you still bear the full cost upfront.

Self-employed earnings are reported on Schedule SE of your tax return. The Social Security Administration uses this information to build your earnings record, just as they do for employees. If you have both W-2 wages and self-employment income in the same year, you pay the employee rate on W-2 wages and the full self-employment rate on your net self-employment income.

What counts as covered earnings and what does not

Only paid work — whether as an employee or self-employed — builds your Social Security record. Volunteer work, unpaid caregiving for family members, and work in the home do not generate payroll tax contributions and do not count toward your benefit record. This is why people who spent years raising children or caring for aging parents may have gaps in their earnings history.

Some government jobs, particularly those in certain state and local pension systems, are not covered by Social Security. If you worked in one of these positions, you would not have paid Social Security tax on those wages and would not earn Social Security credits for that time. The Social Security Administration can tell you whether a specific job was covered.

How the trust fund works and where the money goes

The payroll taxes you and your employer pay go into the Social Security Trust Fund, which is separate from the general U.S. Treasury and separate from income tax. The fund pays out benefits each month to about 67 million people — retirees, disabled workers, and family members of deceased workers. Any money left over after paying benefits is invested in U.S. Treasury bonds, which earn interest.

The trust fund operates on a pay-as-you-go basis: current workers' taxes pay current beneficiaries' checks. When more money comes in than goes out, the surplus builds up. When more goes out than comes in, the fund draws down its reserves. The trustees of the fund publish an annual report on its financial status and project when reserves will be depleted if no changes are made to the tax rate or benefit structure.

Why some people do not pay Social Security tax

Certain groups are exempt from paying Social Security tax. These include some federal employees hired before 1984, railroad workers covered by their own retirement system, and some religious groups that have filed for exemption. If you fall into one of these categories, you would not see the Social Security tax line on your pay stub.

Students employed by the school or university where they are enrolled may be exempt, depending on the type of work. Nonresident aliens on certain visa types do not pay Social Security tax on wages earned in the United States. If you think you may be exempt, your employer's payroll department or the Social Security Administration can clarify your status.

Frequently Asked Questions

Can I stop paying Social Security tax if I do not plan to claim benefits?

No. The payroll tax is mandatory for all covered employees and self-employed workers. You cannot opt out, even if you plan to work past full retirement age or do not expect to need the benefits. The tax is a legal requirement, not a voluntary contribution.

What happens to my Social Security taxes if I die before I claim benefits?

If you have earned enough credits, your family members — spouse, children, or parents — may be able to claim survivor benefits on your record. If no one is may have access to to benefits, the money you paid in does not go back to your heirs; it remains in the trust fund to pay other beneficiaries. This is why Social Security is insurance, not a savings account.

Does my Social Security tax go into a personal account with my name on it?

No. Social Security does not work like a savings account or individual retirement account. Your taxes go into the general trust fund and are used to pay current beneficiaries. Your earnings record is tracked so that your benefit amount can be calculated when you claim, but there is no separate pot of money earmarked for you alone.

If I work part-time and my employer does not take out Social Security tax, am I still building benefits?

Only if your employer is required to do so. Some part-time or temporary jobs are exempt from payroll taxes. If your employer is not withholding Social Security tax, ask them whether the job is covered. If it is covered but they are not withholding, that is a violation and should be reported to the IRS or your state labor department.

How much Social Security tax will I pay over my lifetime?

That depends on your earnings and how long you work. At the 6.2 percent employee rate, someone earning $50,000 a year pays about $3,100 annually (before the wage cap applies). Over a 40-year career, that adds up significantly, but the exact total varies based on wage growth, time out of the workforce, and whether you reach the wage cap in any given year.