In the United States, both employees and employers pay Social Security payroll tax. An employer withholds the employee’s 6.2% share from covered wages and separately pays an equal 6.2% employer share. A self-employed worker generally pays the combined 12.4% equivalent through the Self-Employment Contributions Act (SECA). These are 2026 federal OASDI rates; other countries use different systems.
Understanding who is legally responsible matters because withholding, employer payroll costs, self-employment tax deductions, earnings ceilings and Medicare taxes all work differently.
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Who pays Social Security tax in the United States?
The answer depends on how you earn income. The Federal Insurance Contributions Act (FICA) applies to the employee-employer model. The Self-Employment Contributions Act (SECA) applies to covered self-employment earnings.
Employees pay one-half through payroll withholding
An employee’s Social Security tax is withheld from each paycheck. For 2026, the employee OASDI rate is 6.2% of covered wages until the annual contribution and benefit base is reached. The withholding is not an optional contribution and does not depend on whether the employee expects to claim benefits.
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Employers pay a separate matching share
The employer does not merely pass the employee’s money to the government. It withholds the employee’s 6.2% and owes a separate 6.2% employer contribution on the same covered wages. For 2026, the two OASDI shares total 12.4% before considering Medicare taxes.
Self-employed workers pay both economic shares
A person operating a covered business without an employer generally pays the combined employee-and-employer equivalent through SECA. The 2026 OASDI rate for self-employed workers is 12.4% of covered net earnings. There is no separate employer paying half of that amount on the worker’s behalf.
The Internal Revenue Service allows half of self-employment tax to be deducted as a business expense, according to the Social Security Administration’s explanation. That deduction can reduce taxable income, but it does not shift legal responsibility for the tax to another payer.
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| Worker arrangement | Who is liable for OASDI? | How payment is collected | 2026 OASDI rate |
|---|---|---|---|
| Employee | Employee and employer each owe a share | Employer withholds the employee share and remits both shares | 6.2% employee plus 6.2% employer |
| Employer | Employer owes its own matching share | Paid through the employer’s payroll tax process | 6.2% of covered employee wages |
| Self-employed worker | Worker bears the combined equivalent | Paid as self-employment tax under SECA | 12.4% of covered net earnings |
2026 U.S. Social Security rates and the earnings ceiling
The Social Security portion of FICA and SECA is called Old-Age, Survivors, and Disability Insurance (OASDI). For 2026, the Social Security Administration lists these federal figures:
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| Taxpayer | OASDI rate | 2026 annual OASDI base |
|---|---|---|
| Employee | 6.2% of covered wages | $184,500 |
| Employer | 6.2% of covered wages | |
| Self-employed worker | 12.4% of covered net earnings | $184,500 |
The $184,500 figure is the 2026 OASDI contribution and benefit base. Once a worker has reached that amount in covered earnings during the year, additional earnings are not subject to OASDI for that year. The ceiling applies to Social Security, not to every payroll tax.
Illustrative employee and employer amounts
The following examples apply the 2026 OASDI rates to covered wages and assume the worker has not exceeded the annual base. They show the Social Security portion only, not Medicare.
| Covered annual wages | Employee OASDI at 6.2% | Employer OASDI at 6.2% | Combined OASDI |
|---|---|---|---|
| $50,000 | $3,100 | $3,100 | $6,200 |
| $80,000 | $4,960 | $4,960 | $9,920 |
| $184,500 | $11,439 | $11,439 | $22,878 |
| $250,000 | $11,439 | $11,439 | $22,878 |
In the $250,000 example, the OASDI amounts stop at the $184,500 base. The table is an illustration of the statutory percentage and base; an individual’s payroll can involve multiple employers, changing jobs or other rules that affect withholding timing.
Illustrative self-employed amounts
For a self-employed worker with covered net earnings of $50,000, the 12.4% OASDI equivalent is $6,200. At $80,000, it is $9,920. At $184,500 or more, the 2026 OASDI amount reaches $22,878, because 12.4% applies only through the annual base. These examples address OASDI and do not include Medicare HI or any adjustments that may apply when determining a person’s taxable self-employment earnings.
FICA and SECA: the two collection frameworks
How FICA works for employees
FICA is the payroll-tax framework used when a worker is an employee. The employer calculates the employee’s withholding, takes it from wages, adds the employer’s own contribution, and reports and remits the amounts through its payroll system. The employee sees the withheld share as a reduction in gross pay; the employer’s matching share is an additional employment cost rather than a deduction from that paycheck.
How SECA works for self-employed workers
SECA applies when the worker is responsible for the business activity and has covered net earnings from self-employment. Instead of splitting the OASDI obligation between two parties, SECA charges the worker the combined equivalent. The worker must plan for the full amount, keep records of covered earnings and account for the tax when making required payments and filing.
The ability to deduct one-half of self-employment tax as a business expense is an income-tax rule. It does not mean that a client, customer or government agency has paid the employer portion. Economically, the worker remains responsible for the combined SECA amount.
Why Medicare must be separated from Social Security
Paychecks often display a combined FICA percentage, and self-employment tax discussions often combine OASDI with Medicare Hospital Insurance (HI). Those totals can obscure who pays Social Security. OASDI and HI are separate taxes with different rates and different treatment of high earnings.
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| Program | Employee rate in 2026 | Employer rate in 2026 | Self-employed rate in 2026 | Earnings ceiling |
|---|---|---|---|---|
| OASDI (Social Security) | 6.2% | 6.2% | 12.4% | $184,500 annual base |
| Medicare HI | 1.45% | 1.45% | 2.90% | No OASDI-style annual cap |
The commonly quoted 7.65% employee or employer FICA figure consists of 6.2% OASDI plus 1.45% HI. The 15.30% self-employment figure consists of 12.4% OASDI plus 2.90% HI. Neither total is Social Security alone.
Additional Medicare tax
An additional 0.90% HI tax applies above $200,000 for individual filers and above $250,000 for married couples filing jointly, according to the Social Security Administration’s 2026 table. These thresholds concern Medicare, not OASDI. The $184,500 ceiling therefore does not stop Medicare withholding or self-employment HI tax.
What happens to an employee’s Social Security contribution
- Determine covered wages. Payroll identifies compensation subject to FICA and tracks the worker’s cumulative wages during the calendar year.
- Withhold the employee share. For 2026, 6.2% of covered wages is withheld for OASDI until the worker reaches $184,500 in covered wages for the year.
- Add the employer share. The employer calculates a separate 6.2% OASDI contribution on the covered wages, up to the same annual base.
- Handle Medicare separately. Payroll also applies the 1.45% employee and 1.45% employer HI rates, with the additional HI withholding rules applying at the specified high-income threshold.
- Report and remit the taxes. The employer sends the withheld and employer amounts through its payroll tax reporting and payment process. The employee does not write a separate Social Security check for ordinary wages.
If an employer stops withholding OASDI after the worker reaches the annual base, that is not a loss of coverage for earlier wages; it reflects the statutory annual ceiling. If withholding appears to continue after the base, the worker should ask payroll to review year-to-date wages and any wages from other employers.
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- Classify the income correctly. Determine whether the activity produces covered net earnings from self-employment rather than wages paid by an employer.
- Estimate the covered earnings. Set aside funds using the applicable SECA rate and remember that the worker, not a client, carries both economic shares.
- Separate OASDI from HI. Apply the 12.4% OASDI rate through the $184,500 2026 base, then account separately for the 2.90% HI rate and any additional HI tax that applies.
- Track the annual base. Keep a running total so the OASDI portion is not treated as unlimited. The cap is annual and applies to OASDI covered earnings.
- Claim the permitted deduction correctly. Half of self-employment tax may be deducted as a business expense under the SSA-described rule. That deduction changes income-tax calculations, not who pays SECA.
Because self-employed tax calculations can involve the definition of net earnings and filing-specific rules, a worker should use the current federal instructions or a qualified tax professional for the final computation rather than multiplying gross receipts without adjustments.
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Why country matters: the U.S. model is not universal
Social Security-style contributions are set by each jurisdiction. Before quoting a rate, identify the country, the worker’s status, the program being funded and the tax year. A country may assign a much larger share to employers, require a combined self-employed rate, use monthly declared earnings or add separate programs to the headline percentage.
Spain example from a February 2025 SSA update
The Social Security Administration’s February 2025 International Update described Spain’s standard contributions as generally 4.7% for employees and 23.6% for employers. It described self-employed persons as generally paying 28.3% of declared monthly earnings. The update also described additional MEI contributions of 0.13% for employees and 0.67% for employers.
| Spain contribution described in the February 2025 update | Generally stated rate | Who pays |
|---|---|---|
| Standard employee contribution | 4.7% | Employee |
| Standard employer contribution | 23.6% | Employer |
| Self-employed contribution | 28.3% of declared monthly earnings | Self-employed person |
| Additional MEI contribution | 0.13% | Employee |
| Additional MEI contribution | 0.67% | Employer |
Those Spanish figures illustrate country variation; they are not U.S. rates and should not be assumed to remain current after the cited February 2025 update. A person working outside the United States should consult that country’s current social-security authority before calculating liability.
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Common mistakes when identifying the payer
- Calling the entire payroll percentage “Social Security.” The 7.65% and 15.30% figures include Medicare HI. Quote OASDI separately when the question is specifically about Social Security.
- Assuming the employer pays the employee’s share. The employer withholds the employee share from wages and pays its own equal share. These are two liabilities, not one employer-paid contribution.
- Assuming self-employed workers pay only an employee rate. SECA generally applies the combined equivalent, so the worker bears both economic shares.
- Treating the half-tax deduction as a reimbursement. The deduction can reduce taxable income but does not mean another party has paid half of the SECA bill.
- Applying the OASDI cap to Medicare. The $184,500 2026 base limits OASDI, while HI has different rules and no equivalent OASDI annual ceiling.
- Using a rate without a year or country. Contribution percentages and bases can change. Always label the jurisdiction and tax year, such as “U.S. federal OASDI, 2026.”
A quick way to identify who pays in your situation
- Ask whether you receive wages from an employer or earn income directly from your own business or work.
- If you are an employee, look at your pay statement for an OASDI or Social Security withholding line and remember that your employer owes a separate matching share.
- If you are self-employed, treat the combined SECA amount as your responsibility and track covered net earnings rather than assuming a customer has withheld it.
- Check whether the figure you are reviewing includes Medicare HI; remove the HI portion before answering a Social Security-only question.
- Confirm the applicable annual base and tax year. For U.S. federal OASDI in 2026, the base is $184,500.
- If you work in another country, use that jurisdiction’s current authority because the U.S. split cannot be generalized worldwide.
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