What Is OASDI Tax?
OASDI is the payroll tax that funds Social Security. If you’ve ever looked at your pay stub and wondered what “OASDI” or “Fed OASDI/EE” means, it’s the same thing as Social Security tax — just the official government acronym. The tax pays for three types of benefits: retirement income for workers 62 and older, survivor benefits for families of deceased workers, and disability insurance for workers who can no longer work due to medical conditions.
OASDI Stands For
| Letter | Meaning |
|---|---|
| O | Old-Age (retirement benefits) |
| A | And |
| S | Survivors (benefits for family) |
| D | Disability |
| I | Insurance |
How It Appears on Pay Stubs
Different payroll systems label the OASDI deduction differently, which causes unnecessary confusion. All of the following labels on your pay stub refer to the same tax:
| Label | Meaning |
|---|---|
| OASDI | Official name |
| Social Security | Common name |
| SS | Abbreviation |
| FICA | Social Security + Medicare combined |
| Fed OASDI/EE | Federal OASDI Employee portion |
OASDI Tax Rates
The OASDI tax rate has been 6.2% for employees since 1990 and hasn’t changed since. Your employer pays an identical 6.2%, making the combined rate 12.4% of every dollar you earn up to the wage base. Self-employed workers pay both halves (12.4%), though they can deduct half of this on their income tax return. Unlike Medicare tax, which applies to all earnings with no cap, OASDI is only collected on wages up to the annual limit.
2026 Rates
| Payer | Rate | On Wages Up To |
|---|---|---|
| Employee | 6.2% | $176,100 |
| Employer | 6.2% | $176,100 |
| Combined | 12.4% | $176,100 |
| Self-employed | 12.4% | $176,100 |
FICA Breakdown (OASDI + Medicare)
FICA (Federal Insurance Contributions Act) is the umbrella term that combines both OASDI and Medicare taxes. When you see “FICA” on your pay stub, it includes both deductions. Together, an employee pays 7.65% of their wages in FICA taxes, with the employer matching for a combined 15.3%. The Medicare portion has no wage cap and includes an additional 0.9% surtax for high earners.
| Tax | Employee Rate | Employer Rate | Total |
|---|---|---|---|
| OASDI (Social Security) | 6.2% | 6.2% | 12.4% |
| Medicare | 1.45% | 1.45% | 2.9% |
| Total FICA | 7.65% | 7.65% | 15.3% |
Medicare Surtax (High Earners)
| Income Threshold | Additional Tax |
|---|---|
| Single: $200,000+ | +0.9% |
| Married filing jointly: $250,000+ | +0.9% |
| Married filing separately: $125,000+ | +0.9% |
Social Security Wage Base History
The wage base — the maximum amount of earnings subject to OASDI tax — increases most years to keep pace with average wage growth in the U.S. economy. This means the maximum tax you can pay goes up annually. In 2026, the cap is $176,100 — matching 2025’s limit after the SSA’s annual average wage calculation produced no change. Every dollar you earn above the cap is exempt from OASDI (though Medicare still applies).
Annual Limits
| Year | Wage Base | Max Employee Tax |
|---|---|---|
| 2026 | $176,100 | $10,918.20 |
| 2025 | $176,100 | $10,918.20 |
| 2024 | $168,600 | $10,453.20 |
| 2023 | $160,200 | $9,932.40 |
| 2022 | $147,000 | $9,114.00 |
| 2021 | $142,800 | $8,853.60 |
| 2020 | $137,700 | $8,537.40 |
| 2019 | $132,900 | $8,239.80 |
Why the Limit Increases
The wage base is tied to the Average Wage Index (AWI) calculated by the Social Security Administration. As national average wages rise, the cap rises proportionally. This means more of your earnings become subject to OASDI over time, even if Congress doesn’t change the tax rate.
| Factor | Impact |
|---|---|
| Average Wage Index | Base rises with national wages |
| Inflation | Adjusts for cost of living |
| SSA calculation | Formula determines annual increase |
How OASDI Is Calculated
OASDI calculation is straightforward: multiply your gross wages by 6.2%, up to the annual maximum. Once your year-to-date earnings hit the wage base ($176,100 in 2026), OASDI withholding stops for the rest of the year. This means high earners see a noticeable bump in take-home pay partway through the year — often called the “Social Security tax holiday” — when their paychecks suddenly get larger because OASDI is no longer being deducted.
Standard Employee Calculation
| Gross Wages | × Rate | = OASDI Tax |
|---|---|---|
| $50,000 | × 6.2% | $3,100 |
| $75,000 | × 6.2% | $4,650 |
| $100,000 | × 6.2% | $6,200 |
| $150,000 | × 6.2% | $9,300 |
| $176,100 | × 6.2% | $10,918.20 |
| $200,000 | × 6.2% | $10,918.20 (max) |
| $500,000 | × 6.2% | $10,918.20 (max) |
Per-Paycheck Withholding
Your OASDI withholding is spread evenly across your paychecks until you hit the wage base. If you’re paid biweekly (26 paychecks per year), each check has the same OASDI deduction until the cap is reached. For most workers earning under the wage base, OASDI is withheld from every paycheck all year long.
| Annual Salary | Biweekly OASDI | Monthly OASDI |
|---|---|---|
| $40,000 | $95.38 | $206.67 |
| $60,000 | $143.08 | $310.00 |
| $80,000 | $190.77 | $413.33 |
| $100,000 | $238.46 | $516.67 |
| $120,000 | $286.15 | $620.00 |
| $176,100+ | $420.13 | $909.85 |
When OASDI Stops Being Withheld
If you earn more than the wage base, there’s a specific point in the year when OASDI withholding stops. The higher your salary, the earlier in the year this happens. Someone earning $250,000 stops paying OASDI around September, while someone earning $500,000 stops around May. This is one of the reasons OASDI is considered a regressive tax — the effective rate is lower for high earners because the cap shields their income above the threshold.
Hitting the Wage Base
| Scenario | What Happens |
|---|---|
| Earn under $176,100 | Pay 6.2% all year |
| Earn exactly $176,100 | Pay 6.2% all year |
| Earn over $176,100 | Stop paying once limit reached |
Example: $250,000 Annual Salary
| Period | Wages | OASDI Withheld |
|---|---|---|
| Jan-Aug | $166,667 | $10,333.33 |
| September (partial) | $9,433 | $584.87 |
| Oct–Dec (remaining) | $73,900 | $0 |
| Total | $250,000 | $10,918.20 |
OASDI stops after reaching the $176,100 wage base (~mid-September for this salary).
Calculator: When Will OASDI Stop?
| Annual Salary | Month OASDI Maxes Out |
|---|---|
| $176,100 | December |
| $200,000 | November |
| $250,000 | September |
| $300,000 | July |
| $400,000 | June |
| $500,000 | May |
| $1,000,000 | March |
OASDI for Self-Employed
Self-employed workers pay both the employee and employer portions of OASDI — a combined 12.4% — plus both halves of Medicare (2.9%), for a total self-employment tax of 15.3%. This is a significant burden and one of the biggest tax surprises for new freelancers and small business owners. The silver lining is that you can deduct the employer-equivalent portion (half of SE tax) from your adjusted gross income, which reduces your income tax bill.
The SE tax is calculated on 92.35% of your net self-employment income (not 100%) to approximate the treatment that employees get, since employees don’t pay FICA on the employer’s share.
Self-Employment Tax
| Component | Rate |
|---|---|
| OASDI | 12.4% |
| Medicare | 2.9% |
| Total SE tax | 15.3% |
Self-Employment Calculation
| Net Self-Employment Income | × 92.35% | × 15.3% | = SE Tax |
|---|---|---|---|
| $50,000 | $46,175 | 15.3% | $7,065 |
| $100,000 | $92,350 | 15.3% | $14,130 |
| $176,100+ | $162,628 | 15.3% | $24,882 |
You can deduct half of SE tax (employer portion) from income.
SE Tax Deduction
| SE Tax Paid | Deductible Amount | Tax Savings (22% bracket) |
|---|---|---|
| $7,065 | $3,532 | $777 |
| $14,130 | $7,065 | $1,554 |
| $24,882 | $12,441 | $2,737 |
Multiple Jobs and OASDI
If you work multiple jobs, each employer withholds OASDI independently — they have no way to know what your other employers have already withheld. This means if your combined wages across all jobs exceed the wage base, you’ll overpay OASDI during the year. The good news is you can claim the excess as a refundable credit on your tax return. Your employers’ portions are not refunded — each pays their full 6.2% share.
When You Have Two Employers
| Situation | What Happens |
|---|---|
| Each job under limit | Both employers withhold full 6.2% |
| Combined over limit | You may overpay |
| Overpayment | Claim refund on tax return |
Example: Two Jobs
| Job | Wages | OASDI Withheld |
|---|---|---|
| Job 1 | $100,000 | $6,200 |
| Job 2 | $90,000 | $5,580 |
| Total | $190,000 | $11,780 |
| Maximum owed | $176,100 | $10,918.20 |
| Overpayment | $861.80 |
Claim $861.80 as a credit on Form 1040.
Claiming Excess Social Security Tax
| Line on Form 1040 | Description |
|---|---|
| Schedule 3, Line 11 | Excess Social Security tax withheld |
| Plus additional credits | If applicable |
What OASDI Funds
The 12.4% combined OASDI tax flows into two trust funds managed by the federal government: the Old-Age and Survivors Insurance (OASI) Trust Fund, which pays retirement and survivor benefits, and the Disability Insurance (DI) Trust Fund, which pays disability benefits. These trusts currently pay out more in benefits than they collect in taxes — the gap has been covered by trust fund reserves built up over previous decades, but those reserves are projected to be depleted in the mid-2030s. If Congress doesn’t act, benefits would automatically be reduced to match incoming revenue (roughly a 20-25% cut).
Social Security Benefits
| Benefit Type | Who Receives | Funded By |
|---|---|---|
| Retirement | Workers 62+ | OASDI |
| Spousal | Spouses of retirees | OASDI |
| Widow/widower | Surviving spouses | OASDI |
| Children | Minor children of deceased/disabled | OASDI |
| Disability (SSDI) | Disabled workers | OASDI |
How Benefits Are Calculated
Your eventual Social Security benefit is based on your 35 highest-earning years, adjusted for inflation. The Social Security Administration calculates your Average Indexed Monthly Earnings (AIME) and applies a progressive formula that replaces a higher percentage of income for lower earners. You need at least 40 credits (roughly 10 years of work) to qualify for retirement benefits.
| Factor | Impact |
|---|---|
| Highest 35 years of earnings | Averaged for calculation |
| Age at filing | 62 (reduced) to 70 (maximum) |
| OASDI contributions | Build “credits” for eligibility |
Credits Needed
| Benefit | Credits Required |
|---|---|
| Retirement | 40 credits (10 years work) |
| Disability | Varies by age |
| Survivors | 6-40 credits |
OASDI Exemptions
The vast majority of U.S. workers pay OASDI — it’s one of the most broadly applied taxes in the country. However, a few narrow categories of workers are exempt. Members of certain religious groups (like the Amish and Mennonites) can apply for exemption on religious grounds. Foreign students and exchange visitors on F-1, J-1, or M-1 visas are temporarily exempt. Some state and local government employees covered by separate pension systems may also be exempt, though this has become less common over time.
Who Doesn’t Pay OASDI
| Category | Exemption Type |
|---|---|
| Some religious groups | Apply for exemption |
| Certain visa holders | F-1, J-1, M-1 students |
| Some state/local employees | Covered by other pensions |
| Students working at their school | Specific requirements |
Non-Exempt Income
OASDI applies to virtually all forms of compensation for work — wages, salaries, bonuses, commissions, and tips are all subject to the tax. It does not apply to investment income (interest, dividends, capital gains), pension income, or Social Security benefits themselves.
| Income Type | Subject to OASDI? |
|---|---|
| Wages | Yes |
| Salaries | Yes |
| Bonuses | Yes |
| Commissions | Yes |
| Tips | Yes |
| Self-employment | Yes |
Exempt from OASDI
| Income Type | Subject to OASDI? |
|---|---|
| Investment income | No |
| Interest | No |
| Dividends | No |
| Capital gains | No |
| Pension income | No |
| Social Security benefits | No |
OASDI vs Similar Taxes
OASDI is just one of several payroll taxes that may appear on your pay stub. Understanding how they differ helps you see where your money is going and why different taxes have different caps and rates.
Tax Comparison
| Tax | Rate | Limit | What It Funds |
|---|---|---|---|
| OASDI | 6.2% | $176,100 | Social Security |
| Medicare | 1.45% | No limit | Medicare Part A |
| Additional Medicare | 0.9% | $200k+ | Medicare |
| State disability (CA) | 1.1% | $153,164 | State disability |
| State disability (NJ) | 0.14% | $161,400 | State disability |
FICA Total
| Combined Tax | Employee Pays | No Limit? |
|---|---|---|
| OASDI | 6.2% | Capped at wage base |
| Medicare | 1.45% | No cap |
| Additional Medicare | 0.9% | Over $200k (single) |
| Total potential | 8.55% | On high earners |
Understanding Your Pay Stub
Your pay stub tells you exactly how much OASDI you’ve paid — both for the current pay period and year-to-date. Understanding these numbers helps you verify your employer is withholding correctly and predict when (or if) OASDI withholding will stop for the year.
Sample Pay Stub Breakdown
| Deduction | Amount | Notes |
|---|---|---|
| Federal Income Tax | $461.54 | Based on W-4 |
| OASDI/SS | $238.46 | 6.2% × $3,846.15 |
| Medicare | $55.77 | 1.45% × $3,846.15 |
| State Tax | Varies | State dependent |
| Total FICA | $294.23 | OASDI + Medicare |
Based on $100,000 annual salary, biweekly pay
Frequently Asked Questions
Why is OASDI so much of my paycheck?
OASDI at 6.2% is a significant payroll tax, but your employer also pays 6.2%, making the total contribution 12.4% of your wages. This funds the Social Security system that provides retirement, disability, and survivor benefits.
Can I opt out of OASDI?
Generally no. Most employees must pay OASDI. Exceptions exist for certain religious groups, some nonresident aliens, and students. You cannot opt out simply because you don’t want to pay.
Do high earners pay less proportionally?
Yes. Because OASDI is capped at $176,100 (2026), someone earning $1 million pays the same OASDI as someone earning $176,100 — both pay $10,918.20. This makes OASDI regressive at high incomes. The effective OASDI rate for someone earning $176,100 is 6.2%, while someone earning $500,000 only pays an effective rate of about 2.2% ($10,918.20 ÷ $500,000). This regressivity is one of the most debated aspects of Social Security financing, with some proposals calling for the cap to be raised or eliminated entirely.
Is OASDI being phased out?
No. OASDI is the funding mechanism for Social Security, which remains a major government program. There are ongoing debates about adjustments (raising the cap, changing benefits), but the tax itself is not being eliminated.
OASDI Quick Facts
| Fact | Detail |
|---|---|
| Full name | Old-Age, Survivors, and Disability Insurance |
| Employee rate | 6.2% |
| Employer rate | 6.2% |
| 2026 wage base | $176,100 |
| Maximum employee tax | $10,918.20 |
| Combined with Medicare | Called FICA |
| What it funds | Social Security benefits |
| Who pays | Almost all workers |
Bottom Line
| Understanding OASDI | Key Points |
|---|---|
| What it is | Social Security tax |
| Your contribution | 6.2% of wages up to $176,100 |
| Employer match | Another 6.2% |
| Self-employed | Pay both halves (12.4%) |
| When it stops | After hitting wage base limit |
| Multiple jobs | May overpay; claim refund |
| Funds | Retirement, survivors, disability |
Key takeaways:
- OASDI = Social Security (same thing, different name)
- You pay 6.2% up to $176,100 (2026)
- High earners stop paying before year-end
- Multiple jobs may result in overpayment (refundable)
- Self-employed pay full 12.4%
Related: Tax Brackets | Paycheck Calculator | Social Security Calculator
Sources
- Social Security Administration. “Contribution and Benefit Base.” ssa.gov/oact/cola/cbb.html
- Social Security Administration. “OASDI and SSI Program Rates & Limits.” ssa.gov/policy/docs/quickfacts/prog_highlights
- Internal Revenue Service. “Topic No. 751, Social Security and Medicare Withholding Rates.” irs.gov/taxtopics/tc751
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