Filling out a W-9 as an independent contractor takes a single page and about five minutes: enter your legal name and any business name, check the box for your tax classification, write in your Social Security Number or EIN, add your mailing address, then sign and date the certification at the bottom. The completed form goes back to the business that asked for it, not to the IRS. The company keeps it on file and uses it to prepare your 1099 at year-end.
Start With the Current Form
Download the current W-9 directly from IRS.gov. The version in circulation is the March 2024 revision, and using an older one can get your form kicked back and delay your first payment. The form is one page. Everything you need to complete lives on the front.
Line by Line
Your Name and Business Name
On line 1, enter your full legal name exactly as it appears on your federal tax return. If you operate under a “doing business as” name or a separate brand, that goes on line 2. Sole proprietors and single-member LLCs always put the individual owner’s legal name on line 1, even if the business has its own name.
Federal Tax Classification
Check the single box that matches your entity: individual/sole proprietor, C corporation, S corporation, partnership, trust or estate, or limited liability company. If you check LLC, you also need to note how the LLC is taxed, because the IRS doesn’t treat “LLC” as a tax classification on its own. A single-member LLC is typically taxed as a sole proprietorship, and a multi-member LLC defaults to partnership taxation, unless either has elected corporate treatment.1Internal Revenue Service. Instructions for the Requester of Form W-9 A mismatch here can hold up payment or trigger a follow-up from the payer.
Taxpayer Identification Number
Individuals and sole proprietors normally use their Social Security Number. Businesses and other entities use their Employer Identification Number. Sole proprietors who have an EIN can technically use either, though the IRS encourages using the SSN. Enter the number carefully. If the TIN you provide doesn’t match IRS records, the payer may be required to start withholding 24% from your payments.2Internal Revenue Service. Topic No. 307, Backup Withholding
If you’d rather not hand out your SSN, sole proprietors can apply for a free EIN through IRS.gov and use that number instead, though the IRS still encourages sole proprietors to use their SSN.
Address
Use the mailing address where you reliably receive tax documents. Your 1099 will go there at the end of the year, along with any IRS correspondence tied to the form.
FATCA Exemption Code
There’s a line for a FATCA reporting exemption code, tied to the Foreign Account Tax Compliance Act. Most individual U.S. contractors leave it blank. It applies only to certain entities that are exempt from FATCA reporting under chapter 4 of the Internal Revenue Code.3Internal Revenue Service. Instructions for the Requester of Form W-9
What You’re Signing at the Bottom
The signature line isn’t a formality. You’re certifying, under penalty of perjury, four things: the TIN you provided is correct, you’re not subject to backup withholding, you’re a U.S. person, and any FATCA code you entered is accurate.4Internal Revenue Service. Form W-9 – Request for Taxpayer Identification Number and Certification
The backup withholding piece is the one people miss. You’re subject to backup withholding only if the IRS has specifically notified you that you failed to report interest or dividends on a past return. If you’ve received that notice, cross out item 2 of the certification before signing. If you haven’t, leave the certification as printed.
The penalties for a false certification are real, if rarely triggered for ordinary contractors. A false statement about backup withholding status with no reasonable basis carries a $500 civil penalty.5Office of the Law Revision Counsel. 26 USC 6682 – False Information With Respect to Withholding Willfully falsifying the certification can be prosecuted as a felony, with fines up to $100,000 and up to three years in prison.6Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements For contractors who report their income normally, the certification is just a signature.
How to Send It Back
Sign, date, and return the W-9 to whoever asked for it. The form does not get filed with the IRS. The requesting company keeps it in their records for at least four years to support the 1099s they file.7Internal Revenue Service. Topic No. 305, Recordkeeping
Method matters, because the completed form has your legal name, address, and either your SSN or EIN on it. That’s enough for identity theft. Most companies now collect W-9s through encrypted onboarding portals, which is the safest option. If a client asks you to email it, password-protect the PDF and send the password separately by phone or text rather than dropping your SSN into plain email. Avoid unencrypted fax or regular mail when a secure portal is available.
Verify the request itself before you complete anything. A legitimate request comes from a company you have an actual business relationship with, using a verifiable identity and a clear reason. Unsolicited requests from strangers, pressure to respond immediately, and misspelled email domains or web links are all warning signs.8Internal Revenue Service. Recognize Tax Scams and Fraud If anything feels off, call the company using a number you look up independently.
What If You Don’t Return It
A company can still pay you without a W-9, but they’re required to start backup withholding at 24% on your payments.9Internal Revenue Service. Backup Withholding That money goes to the IRS as a credit toward your taxes. You get it back when you file your return, but in the meantime you’re collecting 76 cents on the dollar. That’s why businesses push for the form before cutting the first check.
W-9 or W-8: Which One Applies
Form W-9 is only for U.S. persons, meaning U.S. citizens, resident aliens, and domestic entities. Foreign individuals use Form W-8BEN and foreign entities use Form W-8BEN-E to document their status and claim any treaty-based reduction in withholding.10Internal Revenue Service. Instructions for Form W-8BEN-E If a U.S. company sends you a W-9 and you aren’t a U.S. person, tell them you’ll be providing the appropriate W-8 instead.
What the Form Sets in Motion
Once your W-9 is on file, the company tracks what it pays you across the year. If your total compensation reaches $2,000, the company files a Form 1099-NEC with the IRS and sends you a copy, generally by the end of January following the tax year.11Internal Revenue Service. Form 1099-NEC and Independent Contractors The $2,000 threshold took effect for payments made after December 31, 2025, replacing the longstanding $600 figure, with inflation adjustments starting in 2027.12Internal Revenue Service. Publication 1099, General Instructions for Certain Information Returns Most businesses still request a W-9 from every contractor regardless of expected pay, because the year’s total isn’t known upfront.
Even if you never receive a 1099 because you stayed under the threshold with a given client, you’re still required to report the income. And because no one is withholding taxes from your contractor pay, the IRS expects quarterly estimated tax payments using Form 1040-ES to cover both your income tax and the 15.3% self-employment tax on your net earnings.13Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)14Internal Revenue Service. Self-Employed Individuals Tax Center The W-9 is the paperwork that starts the relationship; the tax bill is what waits at the other end.