IRS Form W-9 (Request for Taxpayer ID) document pack

A W-9 is the simplest tax form the IRS has ever made and the one freelancers most often fill out wrong, costing themselves quarterly headaches when 1099s arrive in the wrong name to the wrong taxpayer.

Who this pack is for

You're a U.S. person — a citizen, resident alien, sole proprietor, single-member LLC, partnership, or corporation — and a business is asking you to fill out a W-9 before they pay you. The asking party (the requester) needs your taxpayer identification number to issue you a 1099-NEC at year-end if they pay you $600 or more for services in a calendar year. The pack drafts a clean values summary you transcribe to the official IRS PDF, which is what the requester actually needs in their files.

When to use it

Fill out the W-9 the moment a payer asks for one — usually before they cut your first check. Sending the W-9 quickly demonstrates professionalism and avoids backup withholding (24% of every payment, withheld by the payer, recoverable only at tax time). For ongoing relationships, file a new W-9 only when something changes: name change, address change, switching from individual to business entity, getting an EIN. Never send a W-9 by email without secure attachment — the form contains your SSN or EIN and is a target for impersonation. Use a secure portal (the requester's vendor management tool, a SOC2-compliant file share, or encrypted email) and consider sending the form by postal mail for high-stakes engagements.

What it doesn't cover

This pack fills the values you'll transcribe onto the official IRS Form W-9 PDF. It is not the form itself — IRS systems require their own PDF, not a third-party recreation. It does not advise on which federal tax classification you should choose; if you're unsure whether to mark sole proprietor, S-corp, or LLC (and which subtype), talk to a CPA before signing. It does not handle Form W-8 series (the international equivalent for non-U.S. persons — W-8BEN for individuals, W-8BEN-E for entities, W-8ECI for effectively connected income, W-8IMY for intermediaries). And it does not handle FATCA reporting beyond the form's standard exemption codes; entities subject to FATCA reporting need specialized advice.

Common questions

Should I use my SSN or EIN?

Use whichever matches the name on Line 1. If you're an individual sole proprietor using your own name, SSN is fine. If you have an LLC under your own name and an EIN, you can use either — but the choice has implications: SSN means the income flows to your personal return; EIN with a single-member disregarded LLC is the same in tax effect. For privacy, EIN is better — it's not your social. Get one free at irs.gov/EIN in 15 minutes if you don't have one.

What if I'm a single-member LLC?

Line 1 is your name (the individual's name as it appears on your tax return), not the LLC's name. Line 2 is the LLC's name as a 'disregarded entity name.' Line 3 mark 'Individual / sole proprietor' or, if you've elected corporate taxation, the appropriate box. The TIN can be your SSN or the LLC's EIN. This is the most-confused part of the W-9: putting the LLC's name on Line 1 instead of yours leads to mismatched 1099s and IRS notices.

What's backup withholding?

If you don't provide a TIN, or the TIN doesn't match IRS records, the payer must withhold 24% of every payment and send it to the IRS. You get it back when you file your return — but the whole year, you're losing 24% of cash flow you can't replace. The payer is also obligated to start backup withholding if the IRS sends them a 'B notice' indicating a TIN mismatch. The fix: get the W-9 right the first time.

What if the requester wants me to fill out a different form?

The W-9 is the IRS-specified form for U.S. persons. Companies sometimes use modified or branded versions of the W-9 — those are usually fine if they capture the same information and you sign under penalty of perjury. Avoid forms that ask for additional sensitive information (driver's license, mother's maiden name, banking details) — those aren't part of the W-9 and may indicate phishing.

How is this form used?

The requester keeps the W-9 in their vendor file. They use the TIN and name to issue you a 1099-NEC at year-end if they paid you $600 or more (or 1099-MISC for certain other payments, or 1099-K via payment processors for $5,000+ in 2024 and lower thresholds in coming years). Your name and TIN on the 1099 must match the W-9, which must match IRS records. Mismatches trigger backup-withholding letters and CP2100 notices — annoying for both sides.

Should I send a W-9 to anyone who asks?

Only to legitimate payers who need it for tax reporting. The W-9 contains your TIN and signature — sensitive enough that you shouldn't send it to anyone who isn't actually paying you. Be wary of unsolicited requests, especially via email; impersonators target W-9s for SSN harvesting. Verify the request is from a real client, send via a secure channel, and ask why they need it if it isn't obvious.

What about FATCA?

FATCA (Foreign Account Tax Compliance Act) requires certain U.S. persons with foreign financial assets to report them. The W-9 has a FATCA reporting code box — most domestic individuals leave it blank, which is correct. If you have foreign accounts over $50,000 individually or $75,000 jointly, you also have FBAR / Form 8938 obligations. Most W-9 fillers can leave FATCA boxes blank.

Sources

Primary legal sources cited above. These link to free, public versions of the statutes, regulations, and case law referenced in this pack.

Pike provides plain-language legal information, not legal advice. State and local rules change. If money, custody, or your housing is on the line, talk to a licensed attorney or your local legal aid office.