Social Security Wage Base 2024: $168,600 Limit and When Your SS Tax Stops
Every paycheck, Social Security tax (labeled OASDI) is withheld at 6.2% of your gross wages — but only up to a point. In 2024, that point is $168,600. Once your total earnings for the year cross that threshold, Social Security tax stops being withheld, and your take-home pay increases automatically for the remainder of the year.
For workers earning well above $168,600, this annual “bonus” is predictable and worth planning around. Here’s the complete breakdown.
What Is the Social Security Wage Base?
The Social Security wage base is the maximum amount of earnings subject to the Old-Age, Survivors, and Disability Insurance (OASDI) tax in a given year. The IRS and Social Security Administration adjust it annually based on growth in the National Average Wage Index (NAWI).
| Year | Wage Base | Annual SS Tax Max (Employee) |
|---|---|---|
| 2020 | $137,700 | $8,537.40 |
| 2021 | $142,800 | $8,853.60 |
| 2022 | $147,000 | $9,114.00 |
| 2023 | $160,200 | $9,932.40 |
| 2024 | $168,600 | $10,453.20 |
| 2025 | $176,100 | $10,918.20 |
The 2024 increase of $8,400 reflects strong wage growth across the economy. Compared to five years ago, the wage base has grown by $30,900 — meaning high earners pay Social Security tax on significantly more income than they did in 2020.
The Exact Calculation: How OASDI Is Computed
Social Security tax is simple to calculate. For employees:
SS Tax = Wages (up to wage base) × 6.2%
Your employer contributes a matching 6.2%, so the total Social Security contribution rate is 12.4% on wages up to $168,600.
| Annual Salary | Wages Subject to SS Tax | Employee SS Tax | Employer SS Tax | Total |
|---|---|---|---|---|
| $50,000 | $50,000 | $3,100 | $3,100 | $6,200 |
| $100,000 | $100,000 | $6,200 | $6,200 | $12,400 |
| $168,600 | $168,600 | $10,453 | $10,453 | $20,906 |
| $200,000 | $168,600 | $10,453 | $10,453 | $20,906 |
| $350,000 | $168,600 | $10,453 | $10,453 | $20,906 |
Workers earning $200,000 and $500,000 pay the exact same Social Security tax. This is why Social Security tax is often called regressive — it takes a higher percentage of income from lower earners (who never exceed the wage base) than from high earners.
When Does Social Security Tax Stop Each Month of 2024?
Here’s an approximation of when a worker’s year-to-date wages will cross $168,600, by salary level:
| Annual Salary | Monthly Gross | Estimated Month SS Tax Stops |
|---|---|---|
| $168,600 | $14,050 | December (hits cap in last paycheck) |
| $180,000 | $15,000 | October/November |
| $200,000 | $16,667 | October |
| $225,000 | $18,750 | September |
| $250,000 | $20,833 | August |
| $300,000 | $25,000 | July |
| $400,000+ | $33,333+ | May/June |
These are approximations based on equal pay periods and assuming no bonus income. Workers who receive bonuses early in the year may reach the wage base faster.
How This Affects Your Paycheck
Once your cumulative wages exceed $168,600, Social Security withholding stops — and each paycheck gets a little bigger. The effect is exactly 6.2% of each remaining paycheck.
Example: $240,000 Annual Salary (Monthly Paycheck)
| Month | Gross Pay | YTD Wages | SS Withheld This Month | SS Rate Effective |
|---|---|---|---|---|
| January | $20,000 | $20,000 | $1,240 | 6.2% |
| February | $20,000 | $40,000 | $1,240 | 6.2% |
| … | … | … | … | … |
| August (partial) | $20,000 | $160,000 | $1,240 | 6.2% |
| September | $20,000 | $180,000 | $524* | ~2.6% (partial) |
| October | $20,000 | $200,000 | $0 | 0% |
| November | $20,000 | $220,000 | $0 | 0% |
| December | $20,000 | $240,000 | $0 | 0% |
*In the month the cap is crossed, only the portion up to $168,600 is taxed.
Starting in October, this worker’s monthly take-home effectively increases by $1,240 because Social Security is no longer withheld. This is a predictable, automatic raise — no action required.
Use the paycheck calculator to see exactly how your OASDI withholding changes throughout the year based on your salary, pay frequency, and year-to-date earnings.
Medicare Tax: No Cap, Plus the Additional Tax
Unlike Social Security, Medicare tax (1.45%) has no wage base limit. It applies to all wages, no matter how high. High earners also pay an additional 0.9% Medicare tax on wages above $200,000 (single) or $250,000 (married filing jointly).
| Tax | Rate | Applies To |
|---|---|---|
| Social Security (OASDI) | 6.2% | First $168,600 of wages |
| Medicare (standard) | 1.45% | All wages, no cap |
| Additional Medicare Tax | 0.9% | Wages over $200K (single) / $250K (MFJ) |
| Total FICA (typical) | 7.65% | On first $168,600 |
| FICA on wages $168,601+ | 1.45% (or 2.35% if >$200K) | — |
For workers who cross the $168,600 wage base mid-year, FICA goes from 7.65% to 1.45% per dollar of remaining income — a significant drop.
Impact on Self-Employed Workers
Self-employed individuals pay the full 12.4% Social Security tax (both employee and employer share) on earnings up to $168,600. However, they can deduct 50% of the self-employment tax as an above-the-line deduction on their federal return, and can deduct their employer-equivalent share of SE tax from their earnings before calculating the SE tax itself (a circular but real calculation).
Self-employed maximum SE tax in 2024: $168,600 × 12.4% = $20,906.40
This is in addition to the 2.9% Medicare SE tax on all net earnings, plus the 0.9% Additional Medicare Tax above $200,000.
Why the Wage Base Matters for Your Social Security Benefit
Every dollar you earn up to the wage base is factored into your Social Security benefit calculation. The SSA computes your Average Indexed Monthly Earnings (AIME) using your highest 35 years of wage-base-adjusted earnings — and the benefit formula then applies bend point percentages to determine your monthly check.
Earnings above the wage base don’t increase your eventual benefit at all. This is why maximizing pre-tax contributions — especially in 401(k)s — is valuable for high earners: those contributions reduce taxable income without affecting Social Security earnings (which are calculated on gross wages, not taxable income).
To see the full impact of pre-tax contributions on your paycheck and to project your take-home pay through the end of the year as you approach the wage base, use the paycheck calculator. For modeling how compound growth on your contributions builds over time, check out the compound interest calculator.
Key Takeaways
- The 2024 Social Security wage base is $168,600, up $8,400 from 2023
- The maximum employee Social Security tax in 2024 is $10,453.20 (6.2% × $168,600)
- Once you cross the wage base, SS withholding stops — your take-home pay increases by 6.2% per paycheck
- Workers at $200K+ salary see SS tax stop around October 2024
- Medicare tax has no cap — it applies to all wages at 1.45% (plus 0.9% above $200K)
- Earnings above the wage base do not increase your eventual Social Security benefit
- Self-employed workers pay the full 12.4% SS rate but can deduct 50% as an above-the-line deduction
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