Key Takeaways for 2026 Compliance
- Under IRC § 6109, contractors receiving $2,000+ in 2026 ($600 prior) MUST furnish a completed Form W-9 upon request.
- If a contractor refuses, the payer is federally mandated to deduct 24% Backup Withholding (IRC § 3406).
- Failing to withhold exposes the PAYER to 100% personal liability for the uncollected 24% tax.
- Contractors face a $50 IRS penalty per refusal under IRC § 6723 and possible $500 penalty under § 6682.
- Payers remit the 24% withheld tax using IRS Form 945 and record it in Box 4 of Form 1099-NEC.
- Best Practice: Enforce "No W-9, No Check" before dispatching work or releasing the first payment.
Can an Independent Contractor Refuse to Give You a W-9?
Under federal tax law, independent contractors and vendors receiving $2,000 or more in 2026 ($600 for prior tax years) cannot legally refuse a Form W-9 request. If a contractor refuses, federal statutes do not allow the hiring business to simply look the other way. Internal Revenue Code § 3406 mandates that the payer deduct 24% backup withholdingfrom the contractor's compensation and remit it directly to the IRS.
The Legal Mandate: Can a Contractor Refuse a W-9?
Many freelancers and gig workers mistakenly believe that furnishing a Form W-9 is optional or a voluntary courtesy. Federal statutes make it an absolute legal obligation:
IRC § 6109: Mandatory Identification
Any payee receiving payments of $2,000 or more in 2026 ($600 prior to 2026 under OBBBA) in the course of a trade or business must furnish their correct Taxpayer Identification Number (SSN or EIN) to the payer upon request. Failure to comply violates federal tax administration law.
IRC § 3406: 24% Mandatory Deduction
If a payee fails to furnish a TIN in the manner required, the payer shall deduct and withhold tax from such payment at a flat rate of 24%. This withholding is mandatory and non-discretionary.
IRC § 6723: $50 Refusal Penalty
The IRS assesses a $50 fine directly against the payee for each refusal to provide a correct TIN. If the refusal is intentional to evade information reporting, the IRS may assess a $500 penalty under IRC § 6682.
The Payer's Greatest Risk: 100% Personal Liability
The single biggest misunderstanding in accounts payable is believing that a contractor's refusal only hurts the contractor. In reality, the IRS penalizes the hiring business far more harshly:
Treasury Regulation § 31.3406(h)-2: The Payer Liability Trap
If you pay an independent contractor $10,000 without collecting a W-9 and without withholding the 24% backup tax, the IRS does NOT simply look for the contractor. Under federal law, the IRS assesses the uncollected 24% tax ($2,400) directly against YOUR BUSINESS!
You will be required to pay the $2,400 out of your own pocket, plus compounding failure-to-withhold penalties (IRC § 6656) and interest, even though you already paid the contractor 100% of their invoice!
The 4-Stage Escalation Roadmap for Hiring Businesses
When an independent contractor or vendor ignores or refuses your Form W-9 request, execute this standard operating procedure:
Send an encrypted Form W-9 request explicitly citing IRC § 3406. Inform the contractor: "Pursuant to IRS regulations, if we do not receive your completed Form W-9 before invoice approval, we are federally mandated to withhold 24% from your payout and remit it to the IRS."
The cleanest solution is halting all invoice processing. State commercial law supports pausing disbursements when a vendor fails to furnish mandatory statutory tax compliance documentation required for the transaction.
If contractual or operational reasons require issuing payment, calculate exactly 24% of the gross invoice amount. Deduct this amount, pay the contractor the remaining 76%, and provide a payment voucher detailing the federal tax deduction.
Deposit the withheld funds with the IRS via EFTPS. File annual Form 945by January 31. Issue Form 1099-NEC reporting gross payments in Box 1 and the 24% tax withheld in Box 4, writing "Refused" in the recipient TIN box.
The 24% Backup Withholding Formula & Math Model
Review how backup withholding alters cash payouts and balances on a sample $5,000 contractor invoice:
| Line Item | Standard (W-9 Provided) | Backup Withholding (W-9 Refused) |
|---|---|---|
| Gross Contractor Invoice | $5,000.00 | $5,000.00 |
| Mandatory IRS Withholding (24%) | $0.00 (0%) | -$1,200.00 (24%) |
| Net Check Issued to Contractor | $5,000.00 | $3,800.00 |
| Remittance to IRS (Form 945) | None | $1,200.00 deposited via EFTPS |
*Note: The contractor claims the $1,200 withheld as federal income tax credit on Line 25b of their annual Form 1040 when filing their tax return.
IRS Form 4669 & 4670 Relief: Abating Failed Withholding
What if your business already paid a contractor in full without collecting a W-9 or withholding 24%, and the IRS discovers the omission during an audit? The IRS provides an abatement safety valve:
How to Relieve Payer Tax Liability Under IRC § 3402(d)
Under Internal Revenue Code § 3402(d), if the payer can prove that the contractor reported the compensation on their personal income tax return and paid the associated tax, the IRS cannot collect the 24% tax from the payer twice!
Procedure:
1. Have the contractor sign IRS Form 4669 (Statement of Payments Received) certifying they reported the income on Form 1040.
2. The hiring business compiles all signed Form 4669s and attaches them to IRS Form 4670 (Request for Relief from Payment of Certain Taxes).
3. While this abates the 24% tax assessment, the business may still owe late-deposit interest and failure-to-withhold penalties.
How Contractors Can Protect SSNs Without Refusing W-9
Contractors who refuse W-9 forms usually do so out of fear of identity theft, not tax evasion. Educating vendors on this IRS privacy alternative resolves 95% of W-9 disputes immediately:
Any sole proprietor or freelancer can apply online at IRS.gov and obtain an Employer Identification Number (EIN) instantly at zero cost.
The contractor enters their business EIN in Part I of Form W-9, keeping their personal Social Security Number completely hidden from clients.
Send an Encrypted Form W-9 Request in Seconds
Eliminate vendor resistance with client-side encryption. Our generator allows contractors to complete and e-sign official 2026 Form W-9 PDFs without storing sensitive SSN data on external servers.
Frequently Asked Questions
Can an independent contractor legally refuse to fill out a W-9 form?
No. Under Internal Revenue Code § 6109, any person or entity receiving $2,000 or more in 2026 ($600 for tax years prior to 2026 under OBBBA) during a calendar year for business services is required by federal tax law to furnish a correct Taxpayer Identification Number (TIN) upon request by the payer.
Can a hiring business legally withhold payment if a contractor refuses a W-9?
Yes! Most commercial contracts stipulate that submitting a completed Form W-9 is a prerequisite for invoice approval. Even without an explicit contract clause, federal law under IRC § 3406 requires the payer to withhold 24% of the payment if no TIN is provided. Many companies choose to freeze 100% of payment until compliance is achieved.
What is the IRS penalty for a contractor who refuses to provide a W-9?
Under IRC § 6723, the IRS assesses a $50 penalty for each failure to furnish a correct TIN upon request. Furthermore, if a contractor willfully certifies false information or refuses to evade taxes, the IRS can impose a $500 penalty under IRC § 6682 and criminal penalties under IRC § 7206.
What happens if the hiring business fails to deduct 24% backup withholding?
This is the most critical risk for employers. Under Treasury Regulation § 31.3406(h)-2, if a business pays a contractor who refused a W-9 and fails to withhold 24%, the IRS can hold the PAYER personally liable for the uncollected 24% tax, plus compounding interest and failure-to-withhold penalties under IRC § 6656!
How does a business remit 24% backup withholding to the IRS?
Withheld funds must be deposited electronically via the Electronic Federal Tax Payment System (EFTPS) following standard semi-weekly or monthly deposit schedules. At year-end, the payer files IRS Form 945 (Annual Return of Withheld Federal Income Tax) by January 31.
How do you file Form 1099-NEC if the contractor never provided an SSN or EIN?
You must still file Form 1099-NEC with the IRS by January 31. In the recipient TIN box, write "Refused". Report total gross compensation in Box 1, and report the 24% federal tax withheld in Box 4. This establishes proof of your compliance under Treas. Reg. § 301.6724-1.
How can contractors protect SSN privacy without refusing a Form W-9?
Contractors concerned about identity theft can apply for a free Employer Identification Number (EIN) on IRS.gov in 5 minutes. The contractor can enter this business EIN in Part I of Form W-9 instead of their personal Social Security Number.
Can a business get relief if it failed to withhold 24% backup tax?
Yes. Under IRC § 3402(d) and § 3406, if the payer can obtain IRS Form 4669 (Statement of Payments Received) signed by the contractor certifying that the contractor reported the income and paid tax on their own Form 1040, the payer can file Form 4670 to abate the 24% tax assessment.
What documentation proves that a business solicited a W-9?
Under Treasury Regulation § 301.6724-1, payers must maintain records showing: (1) An initial solicitation at onboarding, (2) A first annual solicitation by December 31, and (3) A second annual solicitation by December 31 of the following year. Written certified letters or timestamped electronic audit trails satisfy this requirement.
Does paying via credit card or PayPal exempt the contractor from W-9 rules?
Yes! Under IRC § 6050W, payments settled through third-party payment settlement entities (credit cards, debit cards, PayPal, Stripe) are reported on Form 1099-K by the processor, not on Form 1099-NEC by the payer. Therefore, backup withholding and 1099-NEC obligations do not apply to card payments.
- IRS.gov: Form W-9 (Rev. March 2024) – Request for Taxpayer Identification Number and Certification (OMB No. 1545-0029).Official Source ↗
- Internal Revenue Code: 26 U.S. Code § 3406 — Mandatory 24% Backup Withholding on Reportable Payments (26 U.S.C. § 3406).Official Source ↗
- Treasury Regulations: 26 CFR § 31.3406(h)-3 — Certificates of Taxpayer Identification Number and Signature Verification (Treas. Reg. § 31.3406(h)-3).Official Source ↗
- IRS Publication 1281: Backup Withholding for Missing and Incorrect Name/TIN(s) (Payers Guide) (IRS Pub. 1281 (Rev. 2026)).Official Source ↗