W-2 Box 2 — Federal income tax withheld
Total federal income tax your employer withheld from your paychecks during the year, based on your Form W-4 elections.
At a glance — Box 2
- Box name
- Federal income tax withheld
- Reports to
- Form 1040, Line 25a
- Check against
- Sum of the federal income tax lines on each pay stub for the year.
What Box 2 means
Box 2 reports the total federal income tax withheld from your wages throughout the year. Your employer calculates this using IRS Publication 15-T percentage method or wage bracket tables, applied to your Form W-4 elections (filing status, dependents, other adjustments). Additional flat-dollar withholding you elected on Line 4(c) of your W-4 is also included.
Box 2 does not include Social Security tax (Box 4) or Medicare tax (Box 6) — those are FICA, reported separately. It also does not include state or local income tax (Boxes 17, 19) or federal estimated tax you paid via Form 1040-ES (reported on Line 26 of the 1040).
Tax return implications
- Flows to Form 1040, Line 25a. Combined with 1099 withholding (Line 25b) and other withholding (Line 25c) to offset your total tax liability.
- If Box 2 plus estimated payments exceeds your total tax, the difference is your refund. If less, you owe the difference.
- Under-withholding can trigger the estimated tax penalty (Form 2210) — safe harbors are generally 90% of current year, or 100%/110% of prior year.
Common pitfalls & things to check
- If you worked multiple jobs, each employer withholds as if that job is your only one — common cause of year-end balance owing. Use Form W-4 Step 2 or Publication 505 to compensate.
- Large bonuses are often withheld at 22% flat (under $1M in supplemental wages) which may be too little if your marginal bracket is 24%, 32%, 35% or 37%.
- Bonuses over $1M in supplemental wages are withheld at 37% flat — often too much, and creates a large refund.
FAQ
Is Box 2 the same as my federal tax liability?
No. Box 2 is how much was withheld. Your actual tax liability is computed on Form 1040 and may be higher or lower than Box 2 — the difference is your refund or balance due.
Why is Box 2 zero on my W-2?
Either you claimed 'exempt' on Form W-4 Line 4(c), or your wages were low enough that the IRS tables required no withholding at your claimed filing status and dependent count.
Related W-2 boxes
Box 1 — Wages, tips, other compensation
Your taxable federal wages for the year — gross pay minus pre-tax deductions like traditional 401(k), Section 125 cafeteria plan contributions, and pre-tax HSA.
Box 3 — Social security wages
Your wages subject to Social Security tax, capped at the annual wage base. Differs from Box 1 because traditional 401(k) deferrals are not excluded.
Box 4 — Social security tax withheld
The Social Security tax your employer withheld — exactly 6.2% of Box 3 (plus Box 7 tips), capped at 6.2% of the annual wage base.
Box 5 — Medicare wages and tips
Your wages subject to Medicare tax. Unlike Social Security, there is no wage base cap — Box 5 can exceed Box 3 on high salaries.
Reconciling your W-2 at tax time? Use the paycheck calculator to verify expected federal, Social Security, and Medicare withholdings on your salary, and the federal income tax calculator to estimate your refund or balance owing before you file.
Sources
W-2 box definitions per IRS General Instructions for Forms W-2 and W-3 and IRC §6051. Rates and thresholds current for tax year 2025 (file by April 15, 2026); 2026 figures included where published.