What Happens If You Refuse to Provide a W-9 Form?
Can a contractor legally refuse to submit a W-9? Learn about mandatory 24% IRS backup withholding, account payment holds, and IRC penalties.
When a paying client requests an IRS Form W-9, contractors occasionally hesitate due to privacy concerns over sharing their Social Security Number. However, refusing to supply a valid W-9 carries strict statutory consequences under federal tax law.
1. Mandatory 24% Backup Withholding (IRC § 3406)
Under federal tax law, if a payee fails to provide a correct Taxpayer Identification Number (TIN), the paying business has zero discretion—they are legally mandated to deduct 24% backup withholding from every invoice payment and remit it directly to the IRS.
For example, on a $4,000 freelance payment, your client must withhold $960 and pay you only $3,040.
2. Freeze on Accounts Payable Disbursements
Most corporate accounting departments enforce strict compliance policies: invoice payments are placed on indefinite hold until a completed W-9 is uploaded to vendor onboarding systems.
3. IRS Civil Fines ($50 Penalty per Refusal)
Under IRC § 6723, the IRS imposes a $50 penalty for each failure to furnish a TIN upon request, unless the payee proves reasonable cause.