This guide breaks down OASDI tax in plain language: what it is, how much it costs in 2026, who has to pay it, who is exempt, and how you can calculate your own amount in under a minute.
What Is OASDI Tax?
OASDI stands for Old-Age, Survivors, and Disability Insurance. It is the official government name for what most people simply call Social Security tax. Every time your employer withholds money from your paycheck for "Social Security," that money is actually your OASDI contribution.
This tax is one of two payroll taxes required under the Federal Insurance Contributions Act, commonly known as FICA. The second part of FICA is the Medicare tax, which funds a completely different program. Together, OASDI and Medicare make up the full FICA deduction you see on your paycheck.
The money collected through OASDI tax does not sit in a personal savings account with your name on it. Instead, it flows into a shared trust fund managed by the Social Security Administration, which uses it to pay monthly benefits to people who are retired, disabled, or who have lost a family wage earner.
In simple terms, the OASDI tax you pay today helps fund benefits for someone else right now, and future workers will fund your benefits when it is your turn to receive them
OASDI vs Social Security Tax vs FICA
People often use these three terms interchangeably, and in most everyday conversations that is fine, but they technically mean slightly different things. OASDI is the formal program name used by the government and the Social Security Administration.
Social Security tax is simply the common nickname most Americans use for the same thing. FICA is the broader law that requires both OASDI and Medicare taxes to be withheld from wages.
So when your pay stub shows a line labeled "OASDI," "Fed OASDI/EE," or "Social Security," it is referring to the exact same deduction. FICA is the umbrella law, OASDI is one half of it, and Medicare tax is the other half.
Understanding this distinction helps when you are reading tax documents, comparing pay stubs, or trying to figure out why your total FICA withholding is higher than just the Social Security portion alone.
What Does OASDI Tax Fund?
The money collected through OASDI tax is split between several purposes, and understanding where it goes makes the tax feel less like an abstract deduction and more like an actual safety net you and your coworkers are paying into together.
Retirement (Old-Age) Benefits
The largest share of OASDI tax, roughly eighty-five percent, goes toward paying monthly retirement benefits to workers who have stopped working after reaching a certain age. To qualify, a worker generally needs to have earned at least forty work credits over their career and be at least sixty-two years old, although the benefit amount grows larger the longer someone waits before claiming it, up until their full retirement age.
Disability Benefits
About fifteen percent of OASDI tax funds the Social Security Disability Insurance program, often shortened to SSDI. This portion supports workers who become disabled before retirement age and can no longer earn a living, along with certain qualifying family members.
The benefit amount depends on the worker's past earnings and how long they had been working before the disability occurred.
Survivors Benefits
When a worker who paid into Social Security passes away, their surviving spouse and children may be eligible for monthly survivors benefits. The amount is based on how much the deceased worker paid into the system over their career and their relationship to the person receiving the benefit. This part of OASDI tax exists specifically to protect families from sudden financial hardship after losing a wage earner.
Program Administration Costs
A small slice of OASDI tax, about half a percent, covers the actual cost of running the Social Security program itself, including processing applications, mailing benefit statements, and maintaining the systems that track every worker's earnings history.
OASDI Tax Rate and Wage Base Limit for 2026
For 2026, the OASDI tax rate stays at 6.2 percent for employees and another 6.2 percent for employers, for a combined total of 12.4 percent on every paycheck. This rate has not changed since 1990, even though the dollar amount employers and employees pay keeps rising every year because wages keep rising too.
What does change every year is the wage base limit, also called the taxable maximum. This is the highest amount of an employee's earnings in a calendar year that OASDI tax actually applies to.
Once someone's year-to-date wages cross this limit, no more OASDI tax gets withheld for the rest of that year, even though their Medicare tax keeps being deducted, since Medicare has no cap at all.
OASDI Wage Base Limit History
The table below shows how the wage base limit has climbed in recent years, which gives a sense of how quickly the taxable maximum grows alongside average wages across the country.
Year OASDI Wage Base Limit
2020: $137,700
2021: $142,800
2022: $147,000
2023: $160,200
2024: $168,600
2025: $176,100
2026: $184,500
Anyone earning above this limit will notice their Social Security deduction stop appearing on their pay stub partway through the year, which is completely normal and not a payroll mistake.
Is OASDI Tax Mandatory? Who Has to Pay It
For the vast majority of working people in the United States, yes, OASDI tax is mandatory. It is required by federal law under FICA for employees and under a related law called SECA for self-employed workers.
Employers are legally obligated to withhold it from wages, match it dollar for dollar, and send both portions to the IRS. There is no way for a typical employee to opt out simply because they would prefer to keep the money now instead of later.
That said, the tax is not universal. A small number of specific groups qualify for exemptions, which we will walk through next.
Who Is Exempt From OASDI Tax?
While most workers cannot avoid OASDI tax, the law does carve out a handful of narrow exceptions.
Religious Groups and Clergy
Certain recognized religious groups whose beliefs oppose accepting public insurance benefits can apply for an exemption from both Social Security and Medicare taxes. Members of the clergy can also request an exemption in some cases.
The tradeoff is that anyone who opts out this way also gives up the right to collect Social Security or Medicare benefits later in life, so it is not a decision people make lightly.
Self-Employed Workers Earning Under $400
If someone is self-employed and their net earnings for the year come out below $400, they are not required to pay OASDI tax on that income. Once earnings cross that threshold, the full self-employment tax obligation kicks in.
State and Local Government Employees With a Pension
Some state and local government employees are covered by their own government pension plan instead of Social Security. If that pension plan provides benefits at least as generous as what Social Security would offer, and lets the employee start collecting at or before Social Security's normal retirement age, that employee can be exempt from OASDI tax.
Nonresidents and Certain Visa Holders
Some nonimmigrant and nonresident workers are exempt from OASDI tax depending on their visa type. This commonly applies to foreign students, researchers, and scholars working for a university, as well as certain foreign government employees working inside the United States, since they will not be collecting Social Security benefits from the program either way.
OASDI Tax for Self-Employed Workers
Self-employed people do not get to skip OASDI tax, but the way they pay it works differently from a traditional employee. Instead of FICA, self-employed workers pay under the Self-Employment Contributions Act, or SECA.
Because there is no separate employer to split the cost with, a self-employed person is responsible for the entire 12.4 percent themselves rather than the 6.2 percent an employee pays.
There is a small silver lining here though. When filing an annual tax return, self-employed workers can deduct half of what they paid in self-employment tax, which effectively brings their real cost back down closer to the same 6.2 percent that employees pay.
Most self-employed workers pay this tax through quarterly estimated payments rather than having it withheld automatically from a paycheck, since there is no employer doing the withholding for them.
How to Calculate OASDI Tax
Calculating your own OASDI tax is simpler than most people expect, and you do not need a finance background to do it.
Step-by-Step Calculation With Examples
Start with gross wages, meaning total earnings before any deductions like health insurance or retirement contributions are taken out. Multiply that number by 0.062, since that is the employee's OASDI tax rate. The result is exactly how much will be withheld from that paycheck for OASDI tax, and your employer will separately contribute a matching amount to the government on your behalf.
Here is how that plays out at a few common income levels, based on a full year of gross wages at or below the 2026 wage base limit.
| Annual Gross Wages | Employee OASDI Tax (6.2%) | Employer OASDI Tax (6.2%) |
|---|---|---|
| $30,000 | $1,860 | $1,860 |
| $50,000 | $3,100 | $3,100 |
| $75,000 | $4,650 | $4,650 |
| $100,000 | $6,200 | $6,200 |
| $150,000 | $9,300 | $9,300 |
| $184,500 (2026 cap) | $11,439 | $11,439 |
Anyone earning above $184,500 in 2026 will not owe additional OASDI tax on the amount over that cap, since that is the maximum taxable income for the year.
OASDI on Your Pay Stub: What "Fed OASDI/EE" Means
Pay stubs rarely spell out "Old-Age, Survivors, and Disability Insurance" in full, which is exactly why so many people are confused when they see the abbreviation for the first time. Most commonly, you will see it written as "Fed OASDI/EE," where EE simply stands for employee, meaning this is your portion of the tax being withheld.
If your pay stub also breaks out the employer side, it may appear as "Fed OASDI/ER," with ER standing for employer. Some payroll systems simply label it "Social Security" instead, which refers to the exact same deduction.
OASDI vs SDI: Do Not Confuse These Two
This is one of the most common mix-ups people run into, especially in states like California, New Jersey, and New York that run their own State Disability Insurance programs, usually abbreviated SDI. OASDI is a federal tax that funds retirement, disability, and survivors benefits nationwide. SDI, on the other hand, is a completely separate state-level tax that funds short-term disability and paid family leave benefits only within that specific state.
If you work in one of these states, you might see both OASDI and SDI listed as separate line items on the same pay stub, which is normal and not a duplicate charge. They fund different programs, are calculated using different rates, and are governed by entirely different agencies.
OASDI vs SSI: Two Different Social Security Programs
Another point of confusion is the difference between OASDI and SSI, or Supplemental Security Income. OASDI is funded through the payroll taxes we have been discussing throughout this guide, and eligibility depends on how much someone has worked and paid into the system over their career.
SSI, by contrast, is a needs-based program funded through general government revenue rather than payroll taxes, and it exists to support people with very limited income and resources who are elderly, blind, or disabled, regardless of their work history. Someone can qualify for SSI without ever having paid a cent of OASDI tax.
Can You Get a Refund on Excess OASDI Tax?
Yes, in certain situations you can. If you worked for more than one employer during the same year and your combined wages across those jobs pushed you above the annual wage base limit, it is possible that too much OASDI tax was withheld overall, since each employer withholds independently without knowing what the others deducted.
When this happens, you can claim the excess amount as a credit on your federal income tax return, and it effectively gets refunded to you. This situation typically only affects higher earners who change jobs or hold multiple jobs within the same calendar year.
What Happens If an Employer Does Not Pay OASDI Tax?
Failing to withhold, match, or remit OASDI tax is treated seriously by the IRS. Businesses that fall behind usually receive an official notice along with a monetary penalty first. If the unpaid taxes continue to go unresolved and the failure is considered willful, the consequences escalate quickly.
The IRS can place a lien directly on the business's assets, and in more severe cases, the situation can turn into a criminal matter that carries the possibility of imprisonment for those found responsible.
This liability is not limited to the business itself either; individuals inside the company who were responsible for handling payroll can be held personally accountable if the failure to pay was intentional.
Does OASDI Tax Apply to Bonuses, Commissions, and Stock Options?
Bonuses and commissions are treated as regular wages for OASDI purposes, meaning the same 6.2 percent employee rate and 6.2 percent employer rate apply, right up until an employee's total wages for the year hit the annual wage base limit. If a commission or bonus is paid separately from a regular paycheck, it is usually classified as a supplemental wage, which affects how federal income tax withholding is calculated, but OASDI and Medicare tax still apply the same way regardless.
Stock-based compensation is handled a little differently depending on the type. Restricted stock units, for example, are generally subject to OASDI tax at the moment they vest, based on their fair market value at that time, since that is when the IRS considers the income to be earned.
OASDI Tax for Remote and International Employees
As more companies hire remote workers across state lines and even across borders, OASDI tax questions get more complicated. A remote employee who lives and works entirely within the United States is treated the same as any other domestic employee, regardless of which state they are based in, since OASDI is a federal tax and does not vary by state.
The picture changes for employees working outside the United States. Whether OASDI tax applies often depends on whether the company has a totalization agreement with that employee's country, a treaty designed to prevent workers from being taxed twice for the same type of social insurance in two different countries.
Companies hiring internationally usually need a local entity, an employer of record, or specific payroll expertise to navigate this correctly, which is why growing companies often lean on payroll platforms like pay.day to keep everything compliant as their workforce spreads across different states and countries.
Is Social Security Running Out? The Trust Fund Outlook
It is a question that comes up often, especially among younger workers wondering whether the OASDI tax they pay today will still be there for them decades from now.
According to recent projections from the Social Security Board of Trustees, the combined OASDI trust funds are expected to keep paying full scheduled benefits for a number of years still, but without changes from Congress, the funds are projected to eventually be unable to cover one hundred percent of scheduled benefits from payroll tax income alone.
That does not mean Social Security disappears entirely; it means that unless lawmakers act, incoming payroll tax revenue alone may only be enough to cover a majority of promised benefits rather than the full amount.
This is a policy conversation that continues to evolve, so it is worth checking the latest Social Security Administration trustees report for the most current projections rather than relying on older figures.
How Employers Report OASDI Tax
Employers are generally required to report OASDI tax, along with the rest of their payroll tax obligations, on a quarterly basis using Form 941, officially called the Employer's Quarterly Federal Tax Return.
Smaller employers whose total annual employment tax liability comes out to $1,000 or less may qualify to file annually instead, using Form 944, and agricultural employers have their own annual version called Form 943. On top of these employer filings, businesses must also report each employee's total withheld Social Security tax on their individual Form W-2 at the end of the year, which employees then use when filing their own personal tax returns.
How PayDay Automates OASDI and Payroll Tax Compliance
Manually tracking OASDI tax rates, wage base limits, exemption rules, and quarterly filings is exactly the kind of work that is easy to get wrong, especially as your team grows or starts hiring across state lines. PayDay handles this automatically behind the scenes: every paycheck is calculated with the correct OASDI withholding, wage base limits update on their own each year without anyone needing to track SSA announcements manually, and required forms like 941, 944, and W-2 get generated and filed on time.
If an employee's earnings cross the wage base limit mid-year, PayDay adjusts withholding automatically so nothing gets overpaid or underpaid. That means fewer manual calculations, fewer compliance surprises, and more time back for the people actually running payroll.
OASDI Tax FAQs
Is OASDI the same as Social Security tax?
Yes. OASDI is simply the official, technical name for what most people casually refer to as Social Security tax. Both terms describe the exact same payroll deduction.
What is the OASDI tax rate for 2026?
The rate remains 6.2 percent for employees and 6.2 percent for employers, for a combined 12.4 percent, the same rate that has been in place since 1990.
What is the OASDI wage base limit for 2026?
For 2026, OASDI tax applies to the first $184,500 of an employee's earnings. Any wages earned above that amount are not subject to OASDI tax for the rest of the year.
Do I still pay OASDI tax if I am already receiving Social Security benefits?
Yes. OASDI withholding continues on your wages no matter your age or whether you are already collecting benefits. In fact, continuing to work and pay into the system can actually increase your future monthly benefit, since the Social Security Administration recalculates benefits each year based on your latest earnings.
Can self-employed people avoid OASDI tax?
Only if their net self-employment earnings for the year stay under $400. Above that threshold, self-employed workers owe the full 12.4 percent through SECA, though they can deduct half of it when filing their annual tax return.
Is OASDI tax deductible?
Employees generally cannot deduct their own OASDI tax withholding on their personal income tax return. Self-employed workers are the exception, since they can deduct half of the self-employment tax they pay, which includes their OASDI contribution.
What is the penalty for not paying OASDI tax?
Employers who fail to pay can face IRS penalties, interest charges, and in serious or willful cases, liens on business assets or even criminal prosecution. Individuals responsible for payroll decisions can be held personally liable as well.
How is OASDI different from Medicare tax?
OASDI and Medicare tax are both part of FICA, but they fund completely different programs and are calculated differently. OASDI funds retirement, disability, and survivors benefits and stops once wages hit the annual wage base limit. Medicare tax funds healthcare benefits for seniors, is charged at 1.45 percent for employees, and has no wage limit at all, meaning it applies to every dollar earned.
Disclaimer: PayDay and its affiliates do not provide tax, accounting, or legal advice. This content is for informational purposes only and should not be relied on as a substitute for professional tax, accounting, or legal guidance.
