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OASDI Tax: What it is and how it works
OASDI
OASDI (Old-Age, Survivors, and Disability Insurance) tax, commonly known as the Social Security tax, is one of the key payroll taxes collected in the United States under the Federal Insurance Contributions Act (FICA). Both employees and employers contribute to this tax, which funds the Social Security program.
Let’s explore what OASDI is, how it works, who pays for it, and what employers need to know about it.
What is OASDI tax?
OASDI is Social Security’s official title. Social Security taxes fund essential benefits like retirement and disability assistance. This tax, mandated under FICA, aims to ensure financial security for millions of Americans.
How does OASDI work?
OASDI is a federal tax collected under FICA to fund Social Security programs. Other FICA taxes include the Medicare tax.
The OASDI tax collects contributions to support retirees, individuals with disabilities, and families of deceased workers. Employers deduct 6.2% of employees’ gross wages and make their own FICA contribution to match this amount. Together, this totals 12.4% of an employee’s wages, up to the taxable maximum of $176,100 for 2025.
The rules differ slightly for self-employed individuals. Since they function as both employer and employee, they must pay the entire 12.4% themselves. However, they can deduct half of this on their federal income tax return to reduce the financial impact.
Self-employed workers typically calculate and pay OASDI tax quarterly to stay on top of their obligations. Employers and individuals must keep accurate payroll deduction records to ensure compliance.
Is OASDI tax mandatory?
The OASDI tax is mandatory for most employees, employers, and self-employed individuals in the United States. FICA mandates OASDI taxes for employees and employers, whereas the Self-Employment Contributions Act (SECA) governs self-employed people. These contributions ensure continued funding for Social Security benefits.
There are several exceptions to the OASDI tax requirement:
1. Religious groups: Certain religious organizations and clergy members can opt out of paying Social Security taxes if they file Form 4029 and are approved by the IRS. This decision also waives their eligibility for future Social Security benefits.
2. Self-employed individuals with minimal earnings: Anyone earning less than $400 annually is not required to pay OASDI tax.
3. State and local government employees: Public employees covered by alternative pension plans that meet specific criteria may be exempt from Social Security tax.
4. Nonresidents and visa holders: Some nonresidents and visa holders, such as international students or researchers working in the U.S. under specific visas, may also qualify for exemptions.
Research whether you and your team members are subject to OASDI tax to ensure you comply with payroll tax requirements. Employers also have broader payroll tax responsibilities, including unemployment taxes.
What are OASDI eligibility requirements and benefits?
Eligibility for OASDI benefits depends on accumulating “work credits” through covered employment. The Social Security Administration (SSA) sets a specific threshold for workers to earn credits based on their annual earnings. In 2025, one credit is earned for every $1,810 of covered wages, with a maximum of four credits achievable each year.
To qualify for benefits, workers need at least 40 credits, equivalent to about 10 years of work. Although the number of credits determines eligibility, the actual benefit amount depends on the worker’s average earnings over 35 years.
Types of OASDI benefits and eligibility
Why accurate payroll tracking matters for OASDI benefits
Accurate tracking of payroll contributions, including Social Security taxes, Medicare taxes, and unemployment contributions, ensures compliance and eligibility for Social Security benefits. Employers must accurately withhold and report OASDI contributions, allowing employees to earn the required work credits for retirement, disability, or survivor benefits. Inaccurate or missing contributions may result in delays in benefits or disqualification of workers.
Tracking is especially important for global employers managing payroll across multiple regions, where local tax laws and requirements can add complexity. A well-structured approach to payroll compliance includes explicit handling of pre-tax and post-tax deductions to minimize errors and protect workers’ eligibility for OASDI. Employers navigating compliance across borders should understand distinctions like payroll tax versus income tax to guarantee they meet obligations.
What happens with OASDI taxes for nonresidents?
The OASDI tax generally applies to all workers in the United States, including nonresident citizens working under certain conditions. However, there are exceptions for individuals on specific visa types, as their employment circumstances often exempt them from contributing to Social Security taxes. Here’s a brief overview of some common visa categories exempt from OASDI tax:
- A-Visas: Issued to international government employees and their families, these visas exempt individuals from OASDI taxes as they work in official diplomatic or consular roles.
- D-Visas: Designed for crew members of foreign ships or aircraft operating within the U.S., these workers are generally exempt from OASDI as international agreements govern their employment.
- F-Visas: These student visas are for individuals pursuing academic studies in the U.S. Students often qualify for exemptions from OASDI taxes during their authorized study period.
- G-Visas: Holders of G-visas are employees of international organizations, such as the United Nations, and are not required to pay OASDI taxes while performing their official duties.
- H-Visas: Certain nonimmigrant workers, including agricultural laborers or professionals working temporarily in the U.S., may also qualify for exemptions depending on specific employment agreements.
Understanding when taxes are owed is particularly important for managers dealing with international employees or remote workers.
Stay compliant with Oyster’s solutions
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Learn more about how Oyster can support your global compliance needs.
FAQ’s
When does OASDI tax stop coming out of my paycheck?
For most employees, OASDI withholding stops for the rest of the calendar year once your year-to-date Social Security wages hit the annual wage base limit. If you switch employers mid-year, your new employer will usually start withholding again because they don’t automatically know what you already paid—so you may temporarily overpay until you reconcile it on your tax return.
Do I get OASDI tax back if too much was withheld?
Sometimes, yes, but not in the way people expect. If you had multiple W-2 employers and your combined OASDI withholding exceeded the annual maximum, you typically claim the excess as a credit on your federal income tax return. If the overwithholding happened with only one employer, the cleanest fix is usually to ask that employer to correct it and refund you through payroll—because they’re the one who remitted the money.
What wages are subject to OASDI tax, and which payments are usually excluded?
OASDI generally applies to taxable wages reported through payroll, but the definition of “wages” matters. Some payroll items can be excluded from Social Security wages when they’re handled as pre-tax deductions under a qualifying plan, while other pay elements may remain subject to OASDI even if they feel “benefit-like” to employees. This is why clean payroll setup matters: you want each earning and deduction code mapped correctly so your payslips and year-end reporting reflect the right Social Security wages.
If I’m self-employed, how do OASDI payments actually work in practice?
Self-employed workers pay the employee and employer portions together under self-employment tax, and many people feel the sticker shock because there’s no employer “match” showing up on a paystub. The practical move is to plan for it like a payroll cycle: set aside a percentage of income and make estimated quarterly payments so you’re not trying to solve it all at filing time. You can also deduct the employer-equivalent portion on your federal return, which reduces taxable income even though it doesn’t reduce the self-employment tax itself.
What’s the OASDI wage base for 2026, and how should employers handle year-over-year changes?
The Social Security wage base typically increases most years, which means high earners may see OASDI withholding run longer into the year even when the tax rate stays the same. For employers, the risk isn’t the math—it’s the operational follow-through: updating payroll systems on time, validating wage-base caps across pay groups, and handling edge cases like off-cycle bonuses or employees who transfer between entities. If you’re managing payroll across multiple countries or entities, this is exactly where standardized payroll deductions and clear gross-to-net reporting prevent ugly surprises.
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