What the 2024 Social Security tax limit is

The 2024 Social Security wage base limit is $168,600. This means you pay Social Security tax on earnings up to that amount each year. Once your gross income reaches $168,600 in a calendar year, your employer stops taking Social Security tax from your paycheck for the rest of that year.

Social Security tax itself is 6.2% of your wages (your employer pays another 6.2%). The limit applies to the total amount of income subject to that tax, not to the tax itself. If you earn $200,000 in 2024, you pay the 6.2% tax only on the first $168,600 — the remaining $31,400 is not subject to Social Security tax.

This limit changes every year based on national wage growth. The Social Security Administration announces the new limit in October for the following year. The 2024 limit of $168,600 is an increase from $160,200 in 2023.

Key Takeaways

  • Social Security tax applies only to income up to $168,600 in 2024; income above that amount is not subject to this tax.
  • The limit resets on January 1 each year, so if you change jobs mid-year, your new employer starts counting from zero.
  • Self-employed workers pay both the employee and employer portions (12.4% total) but still only on income up to the annual limit.
  • Higher earners pay less Social Security tax as a percentage of total income because the tax stops at the wage base limit.
  • The limit affects how much you can earn toward future Social Security benefits; income above the limit does not increase your benefit amount.

How the limit affects your paycheck throughout the year

Your employer withholds Social Security tax from each paycheck until your year-to-date earnings hit $168,600. Once that happens, the 6.2% Social Security tax line disappears from your paychecks for the remainder of 2024. Medicare tax (1.45%) continues regardless of income level.

If you earn a steady salary, you will likely stop seeing Social Security tax withheld sometime in the fall. If you earn $168,600 annually, the cutoff happens around mid-December. If you earn $200,000 or more, the cutoff comes earlier — often by September or October.

If you change jobs during the year, each employer counts your earnings separately. You might end up paying Social Security tax on more than $168,600 total if your combined earnings from multiple employers exceed the limit. This is called excess Social Security tax, and you can claim a credit for the overpayment when you file your tax return.

Why the limit exists and how it changes

Congress set the wage base limit to fund Social Security benefits. The limit is designed so that a certain percentage of the working population pays tax on all their earnings, while higher earners pay tax on a smaller percentage of their total income. This structure is intentional — it means Social Security is not a flat tax on all income.

The limit adjusts annually based on the National Average Wage Index, which measures how much the average worker's wages grew in the previous year. If average wages grew 5% from 2022 to 2023, the wage base limit for 2024 increases by roughly 5%. The Social Security Administration calculates and announces the new limit each October.

The limit has grown significantly over decades. In 2000, it was $76,200. In 2010, it was $106,800. The steady increase reflects both inflation and real wage growth in the economy.

How the limit affects your future Social Security benefit

Social Security calculates your benefit based on your highest 35 years of earnings, but only the earnings up to the wage base limit for each year count. If you earned $200,000 in 2024, Social Security uses only $168,600 of that income in the calculation. The extra $31,400 does not increase your benefit.

This means that very high earners do not receive proportionally higher Social Security benefits. A person earning $500,000 per year receives a higher benefit than someone earning $168,600, but not five times higher. The benefit formula is progressive — it replaces a higher percentage of lower earners' income than higher earners' income.

Your benefit also depends on when you start receiving it. If you start at 62, your benefit is lower than if you wait until 67 or 70. The wage base limit does not change this calculation, but it does cap how much of your lifetime earnings count toward the benefit.

Self-employed workers and the 2024 limit

If you are self-employed, you pay both the employee and employer portions of Social Security tax — 12.4% total on net self-employment income. The $168,600 wage base limit still applies. You pay the 12.4% tax only on self-employment income up to $168,600 for the year.

Self-employed workers calculate this on Schedule SE (Self-Employment Tax) when filing taxes. You report your net profit from self-employment, then apply the 12.4% Social Security tax rate up to the $168,600 limit. You can deduct half of your self-employment tax as an adjustment to income on your tax return.

If you have both W-2 wages and self-employment income, the limit applies to your combined earnings. If you earned $150,000 in W-2 wages and $30,000 in self-employment income, you would pay Social Security tax on all $180,000 of combined income — but only the first $168,600 is subject to the tax. The remaining $11,400 is not.

What happens if you overpay Social Security tax

Overpayment occurs when you work for multiple employers in the same year and your combined earnings exceed $168,600. Each employer withholds Social Security tax independently, so you might pay the tax on more than the limit allows.

You cannot get the overpayment back from your employer. Instead, you claim it as a credit on your federal tax return (Form 1040) when you file. The IRS refunds the excess amount as part of your tax refund or applies it to taxes owed. You must file a tax return to recover the overpayment — it does not happen automatically.

For example: You work two jobs in 2024. Job A pays $100,000 and withholds Social Security tax on all of it. Job B pays $80,000 and also withholds Social Security tax on all of it. Your combined earnings are $180,000, but only $168,600 is subject to Social Security tax. You overpaid by $1,488 (12.4% of $12,000). When you file your 2024 tax return, you report this overpayment and receive a refund or credit.

Frequently Asked Questions

Does the wage base limit affect Medicare tax?

No. Medicare tax (1.45% employee, 1.45% employer) has no wage base limit. You pay Medicare tax on all earnings, no matter how high. Additionally, high earners pay an extra 0.9% Medicare tax on wages above $200,000 (single) or $250,000 (married filing jointly).

If I earn less than $168,600, do I still pay Social Security tax on all my income?

Yes. The $168,600 limit is a ceiling, not a threshold. If you earn $100,000, you pay Social Security tax on the full $100,000. The limit only affects people whose income exceeds it.

Does the wage base limit change mid-year?

No. The limit for 2024 is $168,600 for the entire year. It does not adjust if Congress changes the law or if the economy shifts. The new limit takes effect on January 1 of each year.

Can I reduce my Social Security tax by earning less?

Earning less will reduce the amount of Social Security tax you pay, but it will also reduce your future Social Security benefit. Social Security benefits are based on your lifetime earnings record, so lower earnings mean a lower benefit when you retire.

What if I work for the federal government or a state government?

Most federal employees hired after 1983 and most state and local government employees pay Social Security tax and are subject to the wage base limit. Some government employees are covered under different retirement systems (like FERS or PERS) instead of Social Security, but they still pay Medicare tax on all earnings.