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What is FICA Tax, and How is it Calculated?

What is FICA Tax, and How is it Calculated? Social Security and Medicare benefits are funded by a payroll tax called FICA that's shared equally by employees and employers
Women depositing FICA taxes

Social Security and Medicare benefits are funded by a payroll tax called the Federal Insurance Contribution Act, shared equally by employees and employers. FICA was initially created in 1935 to pay for Social Security benefits to retirees. It now covers not only retirement benefits, but also benefits to workers' survivors, and disability benefits. The Medicare tax was added in 1965, helping to pay for medical coverage primarily for those aged 65 and older.

What is the FICA tax?

FICA tax is paid by employees and their employers. Employers have no FICA responsibilities with respect to independent contractors or workers who are employees of another company (e.g., temporary workers who are employed by the temp agency).

The FICA tax comprises of:

  • Social Security tax: This tax is referred to as Old Age, Survivors, and Disability Insurance, or OASDI. It provides benefits to retirees, spouses and former spouses as well as dependent children in some cases, and disabled individuals under retirement age.
  • Medicare tax: This tax allows employees to qualify for Part A Medicare coverage with no additional cost to obtain coverage through Parts B, C, and D when eligible to do so.

The FICA tax rate is applied to all taxable compensation. This includes salary, wages, tips, bonuses, commissions, and taxable fringe benefits. IRS Publication 15-B has a chart of various fringe benefits that are subject to FICA and those that are exempt (see Table 2-1). Compensation subject to FICA also includes salary reduction contributions employees make to 401(k) or comparable plans, even though such contributions are not taxable.

How to calculate the FICA tax

FICA tax is a fixed percentage applied to compensation that's subject to this tax.

Step 1: Determine the compensation to which FICA is applied. Usually, this is all taxable compensation (salary, wages, commissions, bonuses, tips), including taxable fringe benefits (e.g., reimbursement for moving expenses, taxable prizes and awards) and salary reduction amounts for contributions to 401(k)s and similar plans.

Step 2: Assess whether compensation exceeds the annual Social Security wage base. If it's below the wage base for a particular employee, then the FICA tax rate applied is 7.65 percent. If it's above the wage base, then you need to apply the Social Security tax rate to wages up to the wage base and the Medicare tax rate to all compensation (explained next).

Step 3: Double the tax. Whatever the tax is on employee compensation, apply an equal amount to the employer obligation for the tax.

Social security withholding

The Social Security portion of FICA is a flat 6.2 percent of compensation up to a wage base limit. This wage base changes annually. For 2020, the wage base is $137,700. So, the maximum Social Security portion of FICA is $8,537.40 (6.2 percent of $137,700). Again, this is the amount paid by the employee; the employer pays the same amount.

Medicare withholding

The Medicare portion of FICA is 1.45 percent of all compensation subject to this tax, as explained above. There is no wage base limit. For example, if an employee's income for purposes of this tax is $200,000, the Medicare portion of FICA is $2,900 (1.45 percent x $200,000). The employee and the employer each pay this amount.

FAQs about FICA

Employers can deduct their share of FICA, but not the employees' share. Employees cannot deduct their FICA payments. Employers must calculate FICA on employees' tips reported to them. They are also liable for the employer share of FICA on tips that are not reported to them. This liability doesn't arise until the Internal Revenue Service lets you know about them. There are voluntary tip compliance programs for certain industries:

  • Tip Reporting Alternative Commitment (TRAC)
  • Tip Rate Determination Agreement (TRDA)
  • Gaming Industry Tip Compliance Agreement (GITCA).

If the amount of tips used to calculate FICA exceed the federal minimum requirement, you may be eligible for a FICA tip credit.

Withholding FICA and depositing it with the government is only part of employer responsibilities for this tax. Additional responsibilities include:

  • Filing employer tax returns (quarterly or, for very small employers, annually) to report FICA.
  • Reporting Social Security and Medicare tax payments on employees' Form W-2.

Keep in mind that there's an additional Medicare tax on earned income of high earners. More specifically, employers must withhold 0.9 percent when an employee's compensation exceeds $200,000, regardless of the individual's filing status. There is no comparable employer tax payment; the withholding is only on the employee side. The employer cannot deduct any of this tax because it's paid entirely by the employee; it's merely an employer responsibility to do the withholding.

Do self-employed individuals pay FICA taxes?

Self-employed individuals do not pay FICA. Under the Self-Employed Contributions Act (SECA), which came into effect in 1954, self-employed individuals pay a comparable amount of FICA through self-employment tax to cover their Social Security and Medicare obligations. More specifically, self-employed individuals pay the employee and employer share (even though they are neither employees nor employers). One-half of self-employment tax is deductible by self-employed individuals from their gross income (no itemizing is required).

What if an employee works for two corporations that are related to each other?

Each employer must withhold the employee's share and pay the employer's share of FICA for each worker on the payroll. However, if a business is related to another corporation and an employee works for more than one of these businesses at the same time ("concurrent employment"), there's a tax strategy for the employer to save money, known as the "common paymaster rule."

What is the common paymaster rule?

To use the common paymaster rule, the parties must be related. For purposes of this rule, these parties are related if any of the following four conditions are met:

  1. The corporations are members of a controlled group of corporations (which is based on stock ownership);
  2. If the corporation doesn't issue stock, then at least 50 percent of the board of directors of one corporation is on the board of directors of another corporation, or at least 50 percent of the voting power to select such members are concurrently held by holders of more than 50 percent with respect to the other corporation;
  3. Fifty percent of the officers of one corporation are also officers of the other; or
  4. Thirty percent of employees of one corporation work concurrently for the other(s).

If the related corporations agree, they can designate which one is treated as the employer, referred to as "the common paymaster," for purposes of FICA withholding. This common paymaster is responsible for FICA on the employee's wages, regardless of whether the employee receives a consolidated payment at multiple corporations or several paychecks for this work. However, all corporations in the group remain jointly and individually liable for this payroll tax.

What if an employer withholds too much tax from an employee's pay?

If you over-withhold FICA from an employee's pay, you should take steps to correct the problem. Here are the options:

  • Refund the excess withholding to the employee. This can be done by taking out less from the employee's paycheck to offset the excess withholding. This is usually a good option.
  • File a claim with the IRS to recoup the excess payment. This may be necessary if the employee is no longer on your payroll so there's no way to adjust future withholding.

Use Form 941-X, Adjusted Employer's Quarterly Federal Tax Return or Claim for Refund, or Form 944-X, Adjusted Employer's Annual Federal Tax Return or Claim for Refund to make the make an adjustment in withholding or a claim for refund.

If you do nothing, the employee can claim the excess payment as a tax credit on an income tax return.

How do you pay and report FICA taxes?

As an employer, you must deposit FICA and make reports about these taxes to the IRS.

  • Depositing FICA. You must electronically deposit all of your payroll taxes, including FICA. (There is a very limited exception for a small employer with total annual payroll taxes — FICA and income tax withholding — is $1,000 or less for the full year; they can pay by check.) The deposit schedule depends on the size of your payroll.
  • Reporting FICA to the IRS. Usually you report your FICA payments — withholding from your employees as well as your own — four times a year on Form 941. Again, small employees may be permitted by the IRS to file annually on Form 944.
  • Reporting FICA to employees. The amount of FICA withheld from a paycheck should be reported to the employee on the pay stub. It must also be reported on the employee's Form W-2.

Managing FICA tax responsibilities

Looking ahead, the FICA tax rate could increase, and/or changes may be made to the wage base limit to ensure the solvency of the Social Security system. In the meantime, you may want to consider working with a payroll provider for help with your current payroll tax responsibilities.

barbara weltman
Barbara Weltman is a tax and business attorney and the author of J.K. Lasser's Tax Deductions for Small Business as well as 25 other small business books.
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* This content is for educational purposes only, is not intended to provide specific legal advice, and should not be used as a substitute for the legal advice of a qualified attorney or other professional. The information may not reflect the most current legal developments, may be changed without notice and is not guaranteed to be complete, correct, or up-to-date.

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