A W-9 form is a one-page IRS document that hands your legal name, address, and taxpayer identification number to a business that’s paying you, so the business can report those payments to the IRS at year’s end on a 1099. You fill it out; the payer keeps it. It doesn’t get sent to the IRS itself.
If you freelance, consult, contract, rent out property, or open an account that earns interest or dividends, you’ll see one eventually. The form looks simple, and mostly it is. A few lines catch people out, especially anyone running a single-member LLC, and getting those lines wrong can mean 24% of your payments diverted to the IRS until it’s fixed.
Who Gets Asked to Fill One Out
The W-9 is for U.S. persons receiving payments outside a standard employment relationship. Employees fill out a W-4 instead, which tells an employer how much tax to withhold from each paycheck. The W-9 goes to independent contractors, freelancers, consultants, and anyone else earning money from a business without being on its payroll.1Internal Revenue Service. Forms and Associated Taxes for Independent Contractors
The reach is broader than freelance work, though. Banks and brokerages request W-9s for accounts that pay interest or dividends. Real estate closings, canceled debts, and IRA contributions can trigger requests too, because the payer needs your TIN to file the right information return.2Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
The most common trigger is the $600 threshold for filing Form 1099-NEC on nonemployee compensation.3Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC (04/2025) In practice, plenty of businesses ask for a W-9 before paying you a dollar, because chasing down TINs in January is the kind of housekeeping nobody wants.
One boundary worth knowing: the W-9 is only for U.S. persons, which covers U.S. citizens and resident aliens. Foreign individuals and entities use Form W-8BEN instead, so the payer can figure out whether to withhold U.S. tax and at what treaty rate.4Internal Revenue Service. About Form W-8 BEN, Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting (Individuals)
How to Complete Each Line
Lines 1 and 2: Your Name
Line 1 is the name shown on your tax return. For most individuals, that’s your legal name, exactly as the Social Security Administration has it. Line 2 is optional and holds a business name, trade name, or DBA if it’s different from Line 1.2Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
If you run a single-member LLC, the IRS treats it as a “disregarded entity,” meaning it doesn’t exist separately from you for tax purposes. Your own legal name goes on Line 1. The LLC’s name goes on Line 2. This is the line most LLC owners get backward, and a mismatch here creates real problems later on when 1099s don’t reconcile with IRS records.5IRS. Instructions for the Requester of Form W-9 (Rev. March 2024)
Line 3: Federal Tax Classification
Check the box that matches your entity type: individual/sole proprietor, C corporation, S corporation, partnership, or trust/estate.5IRS. Instructions for the Requester of Form W-9 (Rev. March 2024)
LLCs have their own box, with a twist. If you check it, you also write in the letter that matches how the IRS taxes your LLC: C for a C corporation election, S for an S corporation election, or P for partnership treatment. A multi-member LLC that hasn’t elected corporate status writes P, because the IRS treats it as a partnership by default. What matters is federal tax treatment, not what your state called your filing.5IRS. Instructions for the Requester of Form W-9 (Rev. March 2024)
Line 4: Exempt Payee Codes
Line 4 is for entities exempt from backup withholding. Individuals and sole proprietors generally can’t claim an exemption here. Tax-exempt organizations, government agencies, banks, registered securities dealers, and certain corporations can, and they enter a numeric code that matches their category.6IRS. Form W-9 (Rev. March 2024) If you’re a freelancer, you leave this blank.
Part I: Your Taxpayer Identification Number
Your TIN is what links payments to your tax records. For most individual contractors, that’s your Social Security number. Resident aliens without an SSN use an Individual Taxpayer Identification Number (ITIN).6IRS. Form W-9 (Rev. March 2024) Corporations, partnerships, and multi-member LLCs use their Employer Identification Number.
Two rules trip people up. Sole proprietors must use their SSN. Single-member LLCs (disregarded entities) must use the owner’s TIN, not the LLC’s EIN, even if the business has one.7IRS. Form W-9 (Rev. January 2026) If the name on Line 1 and the TIN in Part I don’t match IRS records, the payer will get a mismatch notice, and backup withholding kicks in.
What You’re Signing in Part II
The certification section is signed under penalty of perjury. Four statements travel with your signature: your TIN is correct, you’re a U.S. person, you’re not subject to backup withholding for underreporting interest or dividends, and you’re compliant with (or exempt from) FATCA reporting.2Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
If the IRS has previously told you that you’re subject to backup withholding for underreporting interest or dividends, cross out the second certification item before signing. Crossing it out tells the payer to start withholding 24% right away, which is what the IRS expects.2Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
What Happens After You Hand It Over
The payer uses your W-9 to prepare a 1099 at year’s end. Independent contractor payments of $600 or more usually go on Form 1099-NEC. Rents, royalties, prizes, and similar payments go on Form 1099-MISC. The 1099-NEC is due to the IRS by January 31. The 1099-MISC deadline is February 28 for paper filers, March 31 for electronic filers.3Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC (04/2025)
When something goes wrong with the W-9, backup withholding takes over. The payer deducts 24% from every payment and sends it straight to the IRS on your behalf.8Internal Revenue Service. Topic No. 307, Backup Withholding Federal law spells out four triggers:9Office of the Law Revision Counsel. 26 U.S. Code 3406 – Backup Withholding
- You didn’t give the payer a TIN.
- The IRS notified the payer that the TIN you gave doesn’t match its records.
- The IRS notified the payer to start withholding because you underreported interest or dividend income (this only happens after the IRS has sent you at least four notices over a 120-day period).
- You failed to certify that you’re not subject to backup withholding.
The withheld 24% isn’t gone forever; it shows up as a credit when you file your return. But losing a quarter of every check while you clean up the paperwork is a cash flow hit few contractors can absorb comfortably. Completing the W-9 correctly the first time avoids the whole cycle.
When to Send an Updated W-9
A W-9 doesn’t expire on any schedule, and no IRS rule requires you to resubmit one at a set interval. But it becomes invalid the moment the information on it stops being accurate.10Internal Revenue Service. Instructions for the Requester of Form W-9 (03/2024) Send a new one to each payer when:
- Your name changes because of marriage, divorce, or a legal name change.
- Your TIN changes, for example when a partnership that had been operating under your SSN gets its own EIN.
- Your tax classification changes, such as a C corporation electing S status, or a tax-exempt entity losing its exemption.
- A grantor trust changes ownership, including after the grantor’s death, since the trust’s tax reporting shifts.
The instructions don’t set a specific deadline. Practically, do it before the next payment. If the payer files a 1099 with stale information and the TIN doesn’t match, backup withholding and IRS notices follow.7IRS. Form W-9 (Rev. January 2026) Some businesses ask every vendor for a fresh W-9 each year as a precaution. That’s permitted, even though it’s not required.
Penalties for Getting It Wrong
Failing to give a correct TIN when required can cost you $50 per failure, up to $100,000 per calendar year.11Office of the Law Revision Counsel. 26 USC 6723 – Failure to Comply With Other Information Reporting Requirements Backup withholding stacks on top, because the payer has no choice once your TIN is missing or wrong.12Internal Revenue Service. Backup Withholding
Payers who don’t file correct information returns because they never collected a W-9 face scaling penalties. For 2026, that’s $60 per return if corrected within 30 days, $130 if corrected by August 1, and $340 after that. Intentional disregard runs $680 per return.13Internal Revenue Service. Information Return Penalties
Deliberately lying on a W-9 is a different problem. Because you sign under penalty of perjury, willfully providing false TIN or tax status information can bring criminal charges, with a maximum penalty of a $250,000 fine for individuals and three years in prison.14Internal Revenue Service. Criminal Statutory Provisions and Common Law Prosecutions are rare for ordinary mistakes, but the form carries real legal weight.
Protecting the Information You Just Wrote Down
A completed W-9 has your name, your address, and either your Social Security number or EIN. That’s roughly the full identity theft starter kit. Treat the filled-out form like you’d treat a copy of your Social Security card.
Don’t email it as an unencrypted attachment. The IRS allows electronic submission, but the system used has to verify the signer’s identity, encrypt the transmission, and include an electronic signature under penalty of perjury.10Internal Revenue Service. Instructions for the Requester of Form W-9 (03/2024) A secure portal or encrypted upload is fine. If a business asks you to email a plain PDF, push back and ask for something more secure.
Watch for unsolicited requests, too. A legitimate payer asks for a W-9 when they’re about to pay you for actual work. A W-9 request from a company you’ve never done business with is a red flag, and the IRS asks taxpayers to report suspicious tax-related messages as possible phishing.15Internal Revenue Service. Report Fake IRS, Treasury or Tax-Related Emails and Messages When in doubt, verify the request through a phone number or website you find on your own, not through anything linked in the message.