What is Form W-9?
Form W-9, Request for Taxpayer Identification Number and Certification, is how a business collects a payee's legal name, taxpayer identification number (SSN or EIN), and federal tax classification. Unlike most IRS forms, it's never sent to the IRS — the business keeps it on file and uses it to prepare the 1099-NEC or other information returns at year-end.
For the person filling it out, the W-9 also certifies that you're not subject to backup withholding. Get the TIN wrong or refuse to provide one, and the payer may be required to withhold a flat percentage from every payment — which is why accuracy on this one-page form matters.
Who files Form W-9?
- Independent contractors and freelancers — any U.S. person a business expects to pay $600+ in a year for services.
- Businesses hiring contractors — collect a W-9 before the first payment, not at 1099 time in January.
- Landlords receiving rent from commercial tenants, attorneys receiving settlement payments, and vendors being set up in accounting systems.
- Banks and brokerages also request W-9s when opening accounts, to report interest and dividends.
Deadlines
There's no IRS filing deadline — a W-9 is exchanged between payer and payee, not filed. Best practice is to provide it before the first payment is made. Businesses need the information in hand to issue 1099-NEC forms by January 31.
How to fill out Form W-9
Line 1 — your legal name
The name on your tax return. Sole proprietors use their personal name here, not the business name.
Line 2 — business/disregarded entity name
DBA or single-member LLC name goes here, if you have one.
Line 3 — federal tax classification
Check one box: individual/sole proprietor, C corp, S corp, partnership, trust/estate, or LLC (with its tax classification letter).
Part I — your TIN
SSN for individuals and most sole proprietors; EIN for entities. A single-member LLC generally uses the owner's SSN unless it has elected corporate treatment.
Part II — sign and date
Your signature certifies the TIN is correct and that you're not subject to backup withholding. Return it to the requester — never to the IRS.