Form W-9

Form W-9 (“Request for Taxpayer Identification Number and Certification”) is the IRS form a business collects from a vendor or independent contractor before paying them. The contractor fills it out with their legal name, business name if any, address, and taxpayer identification number — an SSN for an individual or an EIN for a business — and signs it. The business keeps the W-9 on file; it is not sent to the IRS.

The W-9 exists so the payer has the verified information it needs to issue a Form 1099 after year end. Without a completed W-9, a business can be left chasing a contractor for a taxpayer ID at the worst possible time — or facing backup-withholding rules. This page is educational; whether a payment requires a W-9 or a 1099, and any related tax obligation, is confirmed with your CPA or EA.

Missing W-9s are one of the most common cleanup gaps we find. The form is easy to get when a contractor wants to be paid and hard to get once the work is done and the invoice is settled. Making a signed W-9 a condition of the first payment means that, twelve months later, the information needed to issue a 1099 is already on file — instead of becoming a January scramble.

What TechBrot does is operational: we help track which vendors in your QuickBooks file are 1099-eligible and which are still missing a W-9, so the year-end 1099 run isn’t derailed by gaps — see 1099 errors in QuickBooks. Collecting the form, and any decision about a worker’s tax treatment, stays with you and your CPA or EA.

They’re two ends of the same process, and they’re easy to confuse. You collect a W-9 from the people you pay — it flows in to you. You issue a 1099 to those same people after year end — it flows out from you, using the information the W-9 provided. The W-9 is the input; the 1099-NEC is the output.