To fill out a W-9 as an independent contractor, enter your legal name and tax classification, provide either your Social Security Number or an Employer Identification Number, sign the certification under penalties of perjury, and return the completed form directly to the business that requested it. The form itself is one page. The business keeps it in their files and uses the information to issue you a 1099-NEC at year’s end. Here is how to fill out a W-9 for contractors correctly, field by field, along with the choices that matter most.1Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
Starting with payments made after December 31, 2025, any business that pays you $2,000 or more during the year must file Form 1099-NEC reporting that income and send you a copy by January 31 of the following year.2Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC The W-9 gives them the tax ID and entity details they need to file that 1099 accurately. The form never goes to the IRS. The current version was revised in March 2024 and is available on the IRS website.
Line 1: Your Legal Name
Enter your name exactly as it appears on your federal tax return. If you’re a sole proprietor or a single-member LLC that hasn’t elected corporate taxation, that means your personal name, not your business name.3Internal Revenue Service. Form W-9 – Request for Taxpayer Identification Number and Certification The IRS matches the name and TIN on the eventual 1099 against its records, and a mismatch here is the most common cause of backup withholding. Middle initials, hyphenated names, suffixes: match your last tax return.
Line 2: Business or Trade Name
Only fill this in if you operate under a business name or “doing business as” name that differs from Line 1. If your invoices go out under a DBA but you file taxes as an individual, Line 1 is you and Line 2 is the DBA. If your business name matches your legal name, leave Line 2 blank.
Line 3: Federal Tax Classification
Check one box identifying your entity type. The options are Individual/Sole Proprietor, C Corporation, S Corporation, Partnership, Trust/Estate, or LLC. If you check the LLC box, you must also enter a letter code showing how the LLC is taxed: C for C corporation, S for S corporation, or P for partnership.3Internal Revenue Service. Form W-9 – Request for Taxpayer Identification Number and Certification
One point trips up most single-member LLC owners. If your LLC hasn’t elected to be taxed as a corporation, it’s a disregarded entity taxed as a sole proprietorship, and you check the Individual/Sole Proprietor box, not the LLC box. The LLC box with a letter code is only for LLCs that have made an S-corp, C-corp, or partnership election.
Line 4: Exemption Codes
Line 4 has two small spaces. The first is for exempt payee status. The second is for an exemption from FATCA reporting. These codes apply to specific entities like corporations, tax-exempt organizations, and certain retirement plans.4Internal Revenue Service. Instructions for the Requester of Form W-9 If you’re an individual contractor or sole proprietor, leave both spaces blank.
Lines 5 and 6: Address
Enter the mailing address where you want to receive correspondence, including your year-end 1099-NEC. Use a current address. If you move mid-year, send an updated W-9 to each business paying you.
Part I: Your Taxpayer Identification Number
Part I asks for one number. If you’re an individual or sole proprietor, you can enter either your Social Security Number or an Employer Identification Number. Corporations, partnerships, and LLCs treated as corporations or partnerships use their EIN.3Internal Revenue Service. Form W-9 – Request for Taxpayer Identification Number and Certification
Sole proprietors have a choice worth thinking about. Even without employees, you can apply for an EIN and put that on your W-9 instead of your SSN. Your W-9 sits in the hiring company’s files for at least four years and often passes through accounts payable staff, bookkeepers, and third-party payment platforms. An EIN keeps your SSN out of that chain. Applying online through the IRS is free, takes about five minutes, and you receive the number immediately.5Internal Revenue Service. Get an Employer Identification Number
Whichever number you use, make sure it matches the name on Line 1. If you use your SSN, Line 1 must be your personal name. If you use an EIN that’s registered to your business entity, Line 1 must match the name that entity uses on its tax filings.
Part II: Signing the Certification
By signing and dating Part II, you’re stating under penalties of perjury that four things are true: the TIN you provided is correct, you’re not subject to backup withholding, you’re a U.S. person, and any FATCA exemption code you entered is correct.3Internal Revenue Service. Form W-9 – Request for Taxpayer Identification Number and Certification
There’s one situation where you modify the certification before signing. If the IRS has previously notified you that you are subject to backup withholding because of underreported interest or dividend income, cross out item 2 in the certification. Otherwise, leave the language as printed. Sign as yourself if you’re an individual, or as an authorized representative if you’re signing for an entity.
The “penalties of perjury” wording is not decorative. Knowingly providing a false TIN or a fraudulent exemption claim is a federal offense.
Are You a U.S. Person?
The W-9 is only for U.S. persons. That category includes U.S. citizens, resident aliens, domestic partnerships, domestic corporations, and certain domestic estates and trusts.6Office of the Law Revision Counsel. 26 USC 7701 – Definitions Green card holders qualify as U.S. persons even if they’ve never lived in the country full-time. Non-citizens who meet the substantial presence test, generally by spending at least 183 days in the U.S. over a three-year period, also qualify.
If you don’t fit any of those categories, don’t sign a W-9. You’ll fill out a form from the W-8 series instead. The hiring business should know which one to request. If your residency status is unclear, confirm it with a tax professional before signing anything, because the U.S. person certification is one of the four things you’re swearing to.
Getting the Form to Your Client Safely
The completed W-9 goes directly to the business that requested it. Never send it to the IRS. A W-9 contains your legal name, address, and either your SSN or EIN, which is enough for identity theft, so how you transmit it matters.
The safest option is a secure upload portal, if the business offers one. Encrypted email or a password-protected PDF works too. Physical delivery and certified mail are fine. What to avoid is an unencrypted W-9 as a plain email attachment. Keep a copy of what you sent so you can confirm later exactly what information the business has. Once they receive it, they’re required to retain the form for four years.7Internal Revenue Service. Forms and Associated Taxes for Independent Contractors
When to Send an Updated W-9
Send a fresh W-9 to each business paying you whenever your tax information changes. Common triggers: a legal name change, a new EIN, a change in business structure (a sole proprietorship becoming an LLC taxed as an S corporation, for example), or a new address. The 1099-NEC filed at year’s end has to match current IRS records, and a stale W-9 can cause processing delays or backup withholding.
Some businesses request updated W-9s annually as a matter of policy, and they’re allowed to. If a client asks for one you’ve already provided, send it promptly. A business without a valid W-9 on file may be required to start withholding 24% from your payments.
What Errors Cost
Backup withholding is the IRS’s enforcement tool when contractor tax information doesn’t check out. When it applies, the business paying you must withhold 24% of every payment and send it to the IRS on your behalf.8Internal Revenue Service. Backup Withholding The payer has no discretion once the conditions are met.
Four situations trigger it: you fail to provide your TIN, the IRS notifies the payer that the TIN you provided doesn’t match its records, you’ve underreported interest or dividend income, or you fail to certify that you’re not subject to backup withholding.9Office of the Law Revision Counsel. 26 US Code 3406 – Backup Withholding The first two are usually the result of typos on the W-9 or a name that doesn’t match IRS records. The withheld money isn’t lost, since it gets credited against your annual tax liability when you file. The real cost is the cash flow disruption while you sort out the underlying problem.
There are also direct penalties for providing an incorrect TIN. Failure to furnish a correct TIN to a payer who requests it carries a penalty per failure, capped at $100,000 per calendar year, waivable if you show reasonable cause and no willful neglect.10eCFR. 26 CFR 301.6723-1 – Failure to Comply With Other Information Reporting Requirements Knowingly providing a false TIN or fraudulent certification, since the form is signed under penalties of perjury, exposes the signer to criminal liability. Most W-9 problems come from carelessness rather than fraud, but the certification is a sworn statement, so read it before you sign it.