Your Social Security tax rate and what it funds
Social Security tax takes 6.2 percent of your gross wages, up to a yearly earnings cap. Your employer matches that 6.2 percent, so the total contribution is 12.4 percent — but you only see the employee half deducted from your paycheck. The earnings cap changes each year; in 2024 it is $168,600, meaning once you earn that much in a calendar year, no more Social Security tax is withheld from your remaining paychecks.
This tax funds Social Security benefits for retirees, disabled workers, and survivors of deceased workers. It is separate from Medicare tax (which is 1.45 percent) and income tax withholding. When you see "FICA" on your pay stub, that stands for Federal Insurance Contributions Act — it covers both Social Security and Medicare combined.
If you are self-employed, you pay both the employee and employer portions yourself, which totals 12.4 percent for Social Security. You report this on Schedule SE when you file your tax return, and you can deduct half of it as a business expense.
Key Takeaways
- Social Security tax is 6.2 percent of your wages, withheld from each paycheck, with your employer contributing an equal 6.2 percent.
- The earnings cap for 2024 is $168,600, so wages above that amount are not subject to Social Security tax in that year.
- Self-employed workers pay the full 12.4 percent themselves but can deduct half of it on their tax return.
- The cap increases most years based on wage growth, so check the current year's limit if you earn close to it.
How the earnings cap works and why it matters
The earnings cap (also called the wage base) is the maximum income subject to Social Security tax in a given year. Once you earn that amount, your employer stops withholding Social Security tax from your paychecks for the rest of the year. This means high earners pay a smaller percentage of their total income in Social Security tax than lower earners do.
For example, if the 2024 cap is $168,600 and you earn $200,000, you pay 6.2 percent on the first $168,600 but zero percent on the remaining $31,400. Someone earning $80,000 pays 6.2 percent on all of it. The cap is adjusted annually based on changes in national average wages, so it typically rises each year by a small amount.
If you work for multiple employers in the same year, each one withholds Social Security tax independently up to the cap. This can result in overpayment if your combined earnings exceed the cap. You can claim a credit for the overpayment when you file your tax return — you do not get a refund, but the excess reduces your income tax liability.
What happens when you reach the earnings cap
Once you hit the earnings cap in a calendar year, your paychecks stop showing a Social Security tax deduction. This is automatic — your employer's payroll system tracks your year-to-date earnings and stops withholding when you cross the threshold. You will still see Medicare tax (1.45 percent) and income tax withholding on those later paychecks.
This can feel like a raise in your take-home pay during the final paychecks of the year, since you are no longer losing 6.2 percent to Social Security. However, this does not affect your Social Security benefit calculation — the system records all your earnings, and the cap only limits how much tax you owe, not how much credit you receive toward future benefits.
Self-employed Social Security tax
If you are self-employed, you pay both the employee and employer share of Social Security tax: 12.4 percent total on net self-employment income. You calculate this on Schedule SE (Self-Employment Tax) and report it when you file your annual tax return. The same earnings cap applies — you only pay on income up to $168,600 in 2024.
The advantage is that you can deduct half of your self-employment tax as an above-the-line deduction on your Form 1040, which lowers your taxable income. This partially offsets the burden of paying both portions. Keep records of your business income and expenses throughout the year so you can calculate your net self-employment income accurately.
How Social Security tax connects to your future benefits
The Social Security tax you pay now builds your record of earnings, which determines the benefit amount you receive later. Social Security calculates your benefit based on your 35 highest-earning years. The more you earn (up to the cap) and the longer you work, the higher your eventual benefit.
You do not need to pay Social Security tax for 35 years to receive benefits — if you have fewer years of earnings, zeros are factored in for the missing years. However, working longer and earning more in those years can increase your benefit. You can view your estimated benefit and earnings record on your Social Security account at ssa.gov.
Changes to the earnings cap year to year
The Social Security earnings cap is not fixed — it adjusts annually based on the National Average Wage Index, which measures how much the average worker's wages grew that year. In recent years, the cap has risen by roughly $1,000 to $3,000 per year, though the exact increase varies.
If you are a high earner, check the current year's cap early in January so you know when you will stop paying Social Security tax. The Social Security Administration publishes the new cap by early November of the prior year, giving employers time to update their payroll systems. You can find the current and historical caps on ssa.gov under "Contribution and Benefit Base."
Frequently Asked Questions
Can I get a refund if I overpaid Social Security tax?
You do not receive a refund, but you can claim a credit on your tax return. If you worked for multiple employers and your combined earnings exceeded the cap, the excess Social Security tax you paid reduces your income tax liability dollar-for-dollar. File Form 1040 and claim the credit on line 79.
Does Social Security tax explore to all types of income?
Social Security tax applies to wages and self-employment income. It does not explore to investment income, rental income, or most other sources. If you have questions about a specific income type, check with a tax professional or review the IRS guidance on your tax form.
What if I did not pay Social Security tax because I was exempt?
Some workers — such as certain government employees or religious groups — may be exempt from Social Security tax. If you are exempt, you will not build Social Security credits, and you will not receive Social Security benefits later. Exemptions are rare and must be elected when you first become may be able to access.
Does the earnings cap affect how much Social Security benefit I can receive?
The cap limits how much tax you pay, not how much benefit you can receive. Your benefit is based on your earnings record, and the system counts all your income toward that record, even amounts above the cap. However, there is a maximum benefit amount that Social Security will pay regardless of how much you earned.
How do I check my Social Security earnings record?
Create an account at ssa.gov and view your earnings record online. You can see your year-by-year earnings history and your estimated benefit amount. Review it for accuracy — if you spot errors, contact Social Security to correct them, as mistakes can reduce your future benefit.