What Is a W-9 and How Do You Fill One Out? (2026 Guide)

If a client or company just asked you to "send a W-9," don't panic — it's a routine, low-risk form. And if you're a business owner who needs to collect them, getting this right up front saves you a January headache.

Here's exactly what a W-9 is, why it's requested, and how to fill out every line correctly.

What is a W-9?

IRS Form W-9 ("Request for Taxpayer Identification Number and Certification") is a short form that gives a business your correct tax info — your name, address, entity type, and taxpayer ID number (TIN) — so they can report payments they make to you to the IRS.

It is not filed with the IRS. You give it to the requesting business, and they keep it on file. Its whole purpose is so that, at year-end, they can issue you an accurate 1099 if you're owed one.

Who needs to fill out a W-9?

You'll typically be asked for a W-9 if you're:

• An independent contractor or freelancer being paid by a business
• A vendor providing services
• A landlord, or anyone else who'll receive reportable payments

If you're an employee, you fill out a W-4 instead — not a W-9.

How to fill out a W-9, line by line

It's a one-page form. Here's each field:

1. Name — your legal name as it appears on your tax return. If you're a sole proprietor, this is your personal name (not your business name).
2. Business name / disregarded entity — only if different from line 1 (e.g., your DBA or single-member LLC name). Otherwise leave blank.
3. Federal tax classification — check the ONE box that matches how you're taxed:

• Individual/sole proprietor or single-member LLC — most freelancers
• C corporation / S corporation / Partnership
• LLC — then enter the tax classification code (C, S, or P) for how the LLC is taxed
• Trust/estate

1. Exemptions — most individuals leave this blank; it applies to certain entities exempt from backup withholding or FATCA.
2. Address — where the payer should mail your 1099.
3. City, state, ZIP.
4. Account numbers — optional; usually blank.
5. Part I — Taxpayer Identification Number (TIN): your SSN (individuals) or EIN (businesses). If you're a sole proprietor with an EIN, either can work, but the IRS prefers the SSN in most cases.
6. Part II — Certification: sign and date. Your signature certifies your TIN is correct and that you're not subject to backup withholding.

That's it. Send it back to whoever requested it — securely, since it contains your TIN.

Do I need an EIN to fill out a W-9?

No. Sole proprietors can use their SSN. But getting an EIN is free and lets you keep your SSN off forms you send to clients — a small privacy win. If you don't have one, our EIN guide walks through it.

For businesses: how to collect and store W-9s

If you're the one requesting W-9s, the golden rule is collect before you pay:

1. Send a fillable W-9 with the W-9 generator as part of contractor onboarding.
2. Require it back before the first payment goes out — no W-9, no payment.
3. Store it securely (it contains a TIN).
4. Track the contractor's payments all year with a contractor payments tool so year-end 1099s are painless.

Skipping this is the #1 cause of January 1099 chaos — chasing tax info from contractors who've moved on. If a contractor won't provide a W-9, you may be required to apply backup withholding.

Frequently asked questions

What is a W-9 used for?

It gives a business your correct name, entity type, and taxpayer ID so they can report payments to you — typically to issue you a 1099 at year-end. It's not filed with the IRS.

Is it safe to fill out a W-9?

Yes, when the request is legitimate (a client or vendor you actually do business with). It does contain your SSN or EIN, so send it securely and be cautious of unsolicited requests.

Do I use my SSN or EIN on a W-9?

Either works if you have both, but sole proprietors typically use their SSN and businesses use their EIN. An EIN keeps your SSN off forms sent to clients.

What tool helps a business collect W-9s and file 1099s?

Use a platform like Holdings that collects W-9s during onboarding, tracks contractor payments year-round, and generates 1099 forms — so the tax info is captured before the first payment.

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A W-9 is routine — the trick for businesses is collecting it up front. Send one with the W-9 generator, track payments with contractor payments, and generate clean 1099s at year-end. See who even needs a 1099 in Who Gets a 1099?.