What this line means
Federal income tax your employer withheld from your paychecks during the year, as shown in Box 2 of your W-2. This is money already paid to the IRS on your behalf. It counts as a payment toward your total tax liability. If your withholding exceeds your tax, you get a refund. If it falls short, you owe the difference.
Does this apply to you?
- You worked as a W-2 employee and had federal income tax withheld from your paychecks
- You had multiple W-2 jobs during the year and need to add up Box 2 from each
- Your employer withheld federal tax from bonuses, commissions, or stock compensation
Easy to overlook
Multiple W-2s mean multiple withholding amounts to add If you worked for more than one employer during the year, each W-2 has its own Box 2 withholding amount. You must add them all together for line 25a. Missing a W-2 from a short-term job means you fail to claim withholding you already paid, reducing your refund or increasing your balance due. 1 IRS Publication 505 — Tax Withholding and Estimated Tax
Withholding from stock compensation is often at a flat rate When your employer withholds tax on RSU vesting, stock option exercises, or bonuses, they typically withhold at a flat 22% (or 37% for amounts over $1 million). Your actual tax rate on that income may be higher or lower. High earners often find the flat 22% withholding insufficient and owe a balance at filing time. 2 General filing pattern — W-2 Box 2 vs Box 1 confusion
Watch out for this
Using W-2 Box 1 (wages) instead of Box 2 (federal income tax withheld) on this line. Box 1 is your income, not your payment. Line 25a is specifically the amount of tax withheld — the money your employer already sent to the IRS. Using the wrong box dramatically overstates your payments and produces an incorrect refund calculation.
Footnotes
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IRS Publication 505, Tax Withholding and Estimated Tax. https://www.irs.gov/pub/irs-pdf/p505.pdf ↩
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IRS Form 1040 Instructions. See also IRS Publication 17, Your Federal Income Tax. https://www.irs.gov/pub/irs-pdf/p17.pdf ↩