
Social security tax is a mandatory contribution for employees in the United States, with employers deducting these taxes from wage payments. The Federal Insurance Contributions Act (FICA) governs social security taxes, encompassing old-age, survivor, and disability insurance taxes. The current tax rate for social security is 6.2% for both employers and employees, resulting in a combined total of 12.4%. While social security benefits are typically taxable, certain exemptions exist, such as supplemental security income payments. Additionally, under the One Big Beautiful Bill, a significant portion of senior citizens is exempt from paying taxes on their social security benefits, marking a substantial tax break for America's seniors.
| Characteristics | Values |
|---|---|
| Social Security benefits | Monthly retirement, survivor and disability benefits |
| Supplemental security income payments | Not taxable |
| Portion of benefits that are taxable | Depends on taxpayer's income and filing status |
| Self-employment tax | Imposed on non-resident aliens under international Social Security agreements (Totalization Agreements) |
| Social Security tax rate | 6.2% for the employer and 6.2% for the employee, or 12.4% total |
| Medicare tax rate | 1.45% for the employer and 1.45% for the employee, or 2.9% total |
| Additional Medicare tax | Applies to an individual's Medicare wages exceeding a threshold |
| Social Security wage base limit for 2025 | $176,100 |
| Social Security tax exemption | Applies to senior citizens |
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What You'll Learn

The Federal Insurance Contributions Act (FICA)
FICA was enacted in 1935 by the United States Congress, alongside the establishment of Social Security by President Franklin D. Roosevelt. The purpose of FICA is to collect contributions to fund Social Security and ensure that individuals receive financial and health benefits in retirement. These benefits include old-age, survivors, and disability insurance (OASDI). The amount paid in payroll taxes throughout one's working career is indirectly associated with the social security benefits annuity one receives as a retiree.
In addition to Social Security, FICA taxes also fund Medicare, which provides hospital insurance benefits for the elderly. The Hospital Insurance (HI) portion of FICA applies to all earned income, while the OASDI portion is imposed on earned income only up to an annual cap set by Congress. In 2023, the OASDI cap was set at $160,200.
It is important to note that FICA taxes only apply to earned income and are not imposed on investment income, such as rental income, interest, or dividends. Certain exemptions from FICA taxes exist, such as for members of recognised religious groups who are conscientiously opposed to accepting benefits under a private insurance system, and for real estate agents and salespeople under specific circumstances.
FICA represents a foundational element of the US social safety net, providing stability and support for future generations. While some consider FICA to be a tax, others argue that it is not a tax because the collection of FICA contributions is directly tied to the benefits that individuals are entitled to receive later in life.
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Social Security and Medicare withholding rates
The current tax rate for Social Security is 6.2% for the employer and 6.2% for the employee, totalling 12.4%. For Medicare, the rate is 1.45% each for the employer and employee, totalling 2.9%. Employers are responsible for withholding Additional Medicare tax on an individual's wages that exceed $200,000 in a calendar year, without regard to filing status. This additional tax is set at 0.9%, and the employer must withhold this additional amount in the pay period where the employee's wages exceed $200,000, continuing until the year's end.
Social Security benefits include monthly retirement, survivor, and disability benefits, but they do not include supplemental security income payments, which are not taxable. The portion of benefits that are taxable depends on the taxpayer's income and filing status. For single taxpayers, if their total income, including half of their Social Security money, exceeds $25,000, then a portion of their Social Security benefits may be taxable. For married couples filing jointly, if their combined income, including half of each spouse's Social Security, is more than $32,000, then part of their Social Security may be taxable.
The 'One Big Beautiful Bill' is an example of legislation that impacts Social Security tax. This bill ensures that the majority of senior citizens who receive Social Security will pay no tax on their benefits. This includes single taxpayers and married couples, both receiving an average of $24,000 in annual income from Social Security.
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Self-employment tax
To calculate self-employment tax, individuals can use Schedule SE (Form 1040 or Form 1040-SR) to determine their net earnings from self-employment. If net earnings from self-employment (excluding church employee income) are $400 or more, or if church employee income is $108.28 or higher, self-employment tax must be paid. When calculating self-employment income, individuals can subtract half of their self-employment tax from their income before applying the tax rate. Additionally, the employer-equivalent portion of self-employment tax can be deducted when calculating adjusted gross income. However, this deduction only affects income tax and does not impact net earnings from self-employment or the self-employment tax itself.
The self-employment tax rate of 15.3% consists of two parts: 12.4% for Social Security (old-age, survivors, and disability insurance) and 2.9% for Medicare (hospital insurance). For 2024, the first $168,600 of combined wages, tips, and net earnings are subject to the social security portion of self-employment tax. If total earnings subject to this tax amount to $168,600 or more, the 12.4% social security part of the tax no longer applies to net earnings. However, all wages and tips remain subject to the 2.9% Medicare portion of the tax. Individuals may also be liable for an additional 0.9% Medicare Tax based on their income.
It is important to note that self-employed individuals must also pay income tax in addition to self-employment tax. They are required to file an income tax return if their net earnings from self-employment exceed $400. If their net earnings are less than $400, they may still need to file an income tax return if they meet any other filing requirements listed in the Form 1040 and 1040-SR instructions. To determine their income tax liability, self-employed individuals must calculate their net profit or net loss by subtracting business expenses from business income. This calculation is reported on Form 1040 or 1040-SR, and they may be eligible for tax credits, such as the Earned Income Tax Credit (EITC).
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International Social Security agreements
The two main purposes of these agreements are to eliminate dual Social Security taxation and to fill gaps in benefit protection for workers who have divided their careers between two countries. Without these agreements, employees, employers, and self-employed workers might pay Social Security taxes on the same earnings to multiple countries. For example, an American working in an Agreement country would typically pay Social Security taxes only to that country and not also to the United States.
The International Social Security Association (ISSA) is developing a database on international social security agreements, which will include information on existing agreements, contracting countries, dates of entry into force, and types of social security branches covered.
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Taxable Social Security income
The taxability of Social Security benefits depends on the beneficiary's income and filing status. Social Security benefits include monthly retirement, survivor, and disability benefits, but they do not include supplemental security income (SSI) payments, which are not taxable. To determine if their benefits are taxable, taxpayers should take half of the Social Security money collected during the year and add it to their other income, including pensions, wages, interest, dividends, and capital gains. If a taxpayer is single and their total income exceeds $25,000, then part of their Social Security benefits may be taxable. For married couples filing jointly, if their combined income, including half of their Social Security benefits, exceeds $32,000, then a portion of their Social Security benefits may be taxable as well.
It is important to note that the tax laws regarding Social Security benefits have been the subject of recent changes and debates. Under the One Big Beautiful Bill, 88% of seniors receiving Social Security will pay no tax on their benefits, according to the Council of Economic Advisers. However, contrary to claims from President Trump and the Social Security Administration (SSA), the new senior deduction does not eliminate taxes on Social Security benefits for all seniors. In reality, nearly half of Social Security beneficiaries will still have to pay some tax on their benefits, as the taxation is connected to the amount of other income a person has.
Additionally, the new senior deduction primarily benefits higher-income seniors, with those in the $80,000 to $270,000 income range receiving nearly two-thirds of the benefits. Meanwhile, the deduction does little to help low- and middle-income retirees and non-senior beneficiaries, who often already didn't owe any income tax on their Social Security benefits under prior law. Furthermore, the deduction is not available to Social Security beneficiaries under the age of 65, including people with disabilities, early retirees, and family members after the death of a parent or working-age spouse.
When it comes to children who receive Social Security benefits, the taxability of their benefits must be determined separately from their parents or guardians. Generally, a child's Social Security benefits are not taxable, as they typically do not have additional income that would make their benefits taxable. However, if the total of half of the child's Social Security benefits and their other income exceeds the base amount for their filing status ($25,000 for a single child), then a portion of their benefits may be taxable.
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Frequently asked questions
The current Social Security tax rate is 6.2% for both the employer and the employee, or a combined 12.4%.
Yes, there are some exemptions. For example, supplemental security income payments are not taxable. Also, non-resident aliens are generally not subject to self-employment tax.
The portion of benefits that are taxable depends on your income and filing status. As a general rule of thumb, if you are single and your total income (including half of your Social Security money) is more than $25,000, then your benefits may be taxable. If you are married and filing jointly, the threshold is $32,000.
If Social Security taxes were withheld from your pay in error, you should first contact your employer to request a refund. If you are unable to get a full refund from your employer, you can file a claim with the Internal Revenue Service using Form 843.


































