1099-NEC Box 4 — Federal income tax withheld
Federal income tax the payer withheld from your payments — almost always backup withholding at 24% triggered by a missing or incorrect TIN on your Form W-9, or an IRS 'B notice'.
At a glance — Box 4
- Box name
- Federal income tax withheld
- Reports to
- Form 1040, Line 25b (Other forms — 1099s)
- Check against
- Sum of the backup-withholding amounts on each payment advice from the payer during the year. If Box 4 is nonzero but you never expected withholding, check whether the payer received a B-notice (CP2100) from the IRS, or whether the W-9 you submitted had a TIN mismatch.
What Box 4 means
Box 4 reports federal income tax the payer withheld from your payments. Unlike W-2 Box 2 (which is based on your voluntary W-4 elections), 1099-NEC Box 4 is almost always backup withholding — a mandatory 24% flat rate the IRS requires payers to apply in specific circumstances.
Backup withholding is triggered when: (1) you did not furnish a TIN to the payer, (2) you furnished an incorrect TIN and the IRS sent the payer a CP2100/CP2100A 'B notice', (3) you failed to certify you are not subject to backup withholding on your W-9, or (4) the IRS notified the payer that you underreported interest or dividend income. Once triggered, it stays in place until the taxpayer resolves the underlying issue (typically by submitting a corrected W-9).
Because backup withholding is federal income tax (not FICA), you claim Box 4 as a credit against your total tax when you file Form 1040. Unlike self-employment tax, it is a full offset dollar-for-dollar.
Tax return implications
- Flows to Form 1040, Line 25b (other forms, including 1099s). Combines with Line 25a (W-2 withholding) and Line 25c (other) to offset total tax.
- If Box 4 plus other withholding and estimated payments exceeds your total tax liability, the difference is refunded.
- Does not reduce your Schedule C gross receipts — you still report the full Box 1 amount as income and Box 4 separately as a payment/credit.
- Stops the payer from being a withholding agent once the IRS sends them a rescission notice, which typically follows you curing the W-9 issue.
Common pitfalls & things to check
- Do not reduce Schedule C gross receipts by Box 4. Gross receipts is the full Box 1 amount; Box 4 is a separate credit on Form 1040.
- If Box 4 is nonzero but you did not expect withholding, check whether you failed to respond to a W-9 request. Foreign persons paid for US-source services are subject to different withholding (30% on Form 1042-S, not 1099-NEC) — a Box 4 amount on a 1099-NEC issued to a foreign person likely indicates a payer filing error.
- The backup-withholding rate is a flat 24% under IRC §3406(a)(1). Older guidance that references 28% or 31% is obsolete — the 24% rate has been in effect since the Tax Cuts and Jobs Act tax-year 2018 and remains current.
- Backup-withholding-triggered payments are treated as paid evenly over the year for estimated-tax safe-harbor purposes, same as W-2 Box 2 withholding — useful if you were under-withheld via estimated payments but made up for it with large backup withholding late in the year.
FAQ
Why does my 1099-NEC show withholding when I'm a contractor, not an employee?
It's almost certainly backup withholding at 24%. The most common trigger is a missing or mismatched TIN on your Form W-9. Contact the payer, confirm your correct TIN, submit a new W-9, and they can stop withholding on future payments.
Can I get backup withholding refunded?
Yes — Box 4 is federal income tax. It flows to Form 1040, Line 25b, and offsets your total tax liability dollar-for-dollar. If your total withholding exceeds your tax, the difference is refunded on Line 34.
Does Box 4 reduce my self-employment tax?
No. Backup withholding only offsets federal income tax, not self-employment tax (Schedule SE, reported on Schedule 2, Line 4). SE tax is calculated on Schedule C net profit and is not reduced by Box 4.
Related 1099-NEC boxes
Box 1 — Nonemployee compensation
Total payments of $600 or more your payer made to you as an independent contractor during the year — fees, commissions, prizes, and other compensation for services.
Box 2 — Payer made direct sales totaling $5,000 or more
A checkbox indicator (not a dollar amount) that the payer sold you $5,000 or more of consumer products for resale, on buy-sell, deposit-commission, or any other basis.
Box 5 — State tax withheld
State income tax the payer withheld from your nonemployee compensation — rare for residents, more common for nonresident performers, athletes, and contractors working in the payer's state.
Box 6 — State / Payer's state number
The two-letter state abbreviation and the payer's state tax identification number — identifies which state Box 5 (state tax withheld) and Box 7 (state income) relate to.
Freelancer filing a 1099-NEC? Use the 1099 tax calculator to estimate your federal income tax and self-employment tax, the quarterly estimated tax calculator to stay on top of Form 1040-ES payments, and the W-2 vs 1099 comparison if you're deciding between contractor and employee classification.
Sources
1099-NEC box definitions per IRS General Instructions for Forms 1099-MISC and 1099-NEC, IRC §6041A, §6045(f), and §3406 (backup withholding). Year-specific thresholds pulled from the site's central tax-year config (2025 filing year shown).