FICA appears in boxes 4 and 6 of your W2, labeled as Social Security and Medicare tax withheld

Your W2 form lists FICA taxes in two separate boxes on the right side of the document. Box 4 shows Social Security tax withheld, and Box 6 shows Medicare tax withheld. These are the two components of FICA. The amounts in these boxes represent what your employer deducted from your paychecks during the year and sent to the federal government on your behalf.

The W2 itself is divided into sections. The left side contains your personal information and employer details. The right side, labeled "Boxes," contains the wage and tax information. FICA boxes sit in the middle-right area, below the federal income tax box (Box 2) and above the state income tax boxes. If you are looking at a printed W2, these boxes are easy to spot because they are clearly numbered.

You will receive your W2 by January 31 of the year following the tax year. If you worked for multiple employers in a single year, you will receive one W2 from each employer, and each will show the FICA taxes that employer withheld.

Key Takeaways

  • Box 4 on your W2 shows the total Social Security tax your employer withheld from your pay during the year.
  • Box 6 on your W2 shows the total Medicare tax your employer withheld from your pay during the year.
  • Both boxes appear on the right side of the form in the numbered section, below federal income tax information.
  • If you worked for multiple employers, each W2 will show FICA withheld by that specific employer only.

How to read the FICA boxes on your W2

Open your W2 and locate the section labeled "Boxes" on the right half of the form. This section contains numbered boxes from 1 through 20. Look for Box 4 first — it will have the label "Social Security tax withheld" printed next to it. The dollar amount in Box 4 is what came out of your paychecks for Social Security.

Directly below Box 4, you will find Box 5, which shows your Social Security wages (the amount your Social Security tax was calculated on). Below that is Box 6, labeled "Medicare tax withheld." The amount in Box 6 is what came out of your paychecks for Medicare. Box 7 shows your Medicare wages.

The numbers in Boxes 4 and 6 should match what you see on your pay stubs throughout the year. If you kept your final pay stub from 2024, you can compare the year-to-date FICA amounts on that stub to the W2 boxes — they should be identical or very close (within a dollar or two if there were corrections).

Why FICA is split into two boxes

Social Security and Medicare are two separate federal programs with different tax rates and wage limits. Social Security tax is 6.2% of your wages, up to a maximum wage base (which changes each year — in 2024 it was $168,600). Medicare tax is 1.45% of all your wages with no upper limit. Because they are calculated differently and fund different programs, the W2 reports them separately.

If you earned over the Social Security wage base in a year, Box 4 will show tax only on wages up to that limit, while Box 6 will show tax on your full wages. This is why the two amounts are rarely proportional to each other.

There is also an Additional Medicare Tax of 0.9% that applies to high earners. If you earned more than $200,000 as a single filer (or $250,000 if married filing jointly), this additional tax may appear in Box 6 or on a separate line. Your employer is responsible for withholding this, and it will be included in the Medicare tax amount shown.

What the FICA amounts mean for your taxes

The FICA taxes shown in Boxes 4 and 6 are already withheld from your pay — you do not owe them again. When you file your tax return, these amounts are reported to the IRS and credited toward your tax liability. They are separate from federal income tax (Box 2), which is also withheld but calculated at a different rate based on your W4 form.

FICA taxes fund Social Security and Medicare benefits. The amounts withheld are recorded under your Social Security number and contribute to your future benefits. You can view your Social Security earnings record online at ssa.gov to confirm that your employer reported your wages correctly.

If you had multiple jobs in one year, you may have overpaid Social Security tax. This happens because each employer withholds Social Security tax up to the wage base, and if your combined wages from all jobs exceed the limit, you will have paid more than required. You can claim a credit for the overpayment when you file your tax return.

Comparing FICA across multiple W2s

If you worked for more than one employer during the year, you will receive a separate W2 from each one. Each W2 will show only the FICA taxes that specific employer withheld. To see your total FICA withholding for the year, you need to add up the amounts from all your W2s.

This is especially important for Social Security tax. If your combined wages from all employers exceeded the Social Security wage base, you may have overpaid. For example, if you earned $100,000 at Job A and $80,000 at Job B, your total wages were $180,000. The Social Security wage base in 2024 was $168,600, so you overpaid by $11,400 × 6.2% = $706.80. You can claim this as a credit on your tax return.

Medicare tax does not have an overpayment issue because there is no wage limit, but you should still add up the Medicare tax from all W2s to verify the total on your tax return.

If FICA amounts look wrong on your W2

Compare the FICA amounts on your W2 to your pay stubs. If your final pay stub from the year shows year-to-date FICA that does not match the W2, contact your employer's payroll department first. Small discrepancies (under $5) can happen due to rounding or final adjustments, but larger differences should be investigated.

If your employer made an error, they will issue a corrected W2 (called a W2-C) and send it to you and the IRS. You do not need to do anything — the IRS will update their records. However, if you already filed your tax return and the corrected W2 shows different amounts, you may need to file an amended return (Form 1040-X).

If you believe your employer did not withhold FICA at all, or withheld the wrong amount, document this with your pay stubs and contact your employer immediately. FICA withholding is mandatory, and employers are required by law to withhold and report it correctly.

Frequently Asked Questions

Can I find FICA information anywhere other than the W2?

Yes. Your pay stubs show FICA withheld on each paycheck and year-to-date totals. You can also create a my Social Security account at ssa.gov to view your earnings record, which shows the wages your employers reported and the Social Security tax credited to your account each year. This record is updated annually.

What if I see FICA on my W2 but I am self-employed?

Self-employed people do not receive a W2. Instead, they report income on a Schedule C and pay self-employment tax (which is similar to FICA but calculated differently) on a Schedule SE. If you received a W2, you were an employee of that business, not self-employed.

Do I need to report FICA separately when I file my taxes?

No. The FICA amounts from your W2 are automatically reported to the IRS when your employer files your W2. You do not enter them separately on your return. The IRS matches the W2 information to your tax return automatically.

Why is my Medicare tax higher than my Social Security tax even though I earned less than the wage base?

This should not happen if you earned below the Social Security wage base. Both taxes are calculated on the same wages. If Medicare tax appears higher, you may have earned above the wage base, or there may be an error. Check your pay stubs and contact payroll if the amounts do not make sense.