What Is a W-9 Form? Uses, How to Fill It Out, and 1099s

A W-9 form is the IRS document a business uses to collect your taxpayer identification number before it pays you as a non-employee and reports those payments to the IRS. The company paying you is the requester; you are the payee. You fill it out once, hand it back to the business (never to the IRS), and the information on it flows onto a 1099 at year-end.¹

When You’ll Be Asked for a W-9

The most common trigger is being hired as an independent contractor, freelancer, or consultant. Before a business cuts your first check, it needs a completed W-9 on file so it can report what it paid you.²

Service payments aren’t the only reason. Banks and brokerages ask for a W-9 to report interest and dividend income. Real estate companies use one for rent payments and property sale proceeds. Lenders may request one to report mortgage interest paid or canceled debt. The common thread is straightforward: if a company will eventually file an information return about money it paid you, it needs your W-9 first.¹

Who Should Not Fill Out a W-9

If you’re an employee with taxes withheld from a regular paycheck, the correct form is a W-4, not a W-9. The distinction is not cosmetic. A company handing you a W-9 instead of a W-4 is treating you as an independent contractor, which pushes self-employment taxes onto you and removes eligibility for employer benefits. If you think you’re actually an employee, that classification is worth questioning before you sign anything.

Foreign individuals and entities also don’t use the W-9. Signing the form certifies that you are a U.S. person, meaning a U.S. citizen, a green card holder, or someone who meets the substantial presence test. If you don’t qualify, you belong on one of the W-8 series forms instead, such as the W-8BEN. Green card holders sometimes assume the reverse because they hold foreign citizenship, but U.S. residency status controls, and the W-9 is the right form for them.³

How to Fill Out a W-9

The form is one page. Each field feeds the IRS matching system, so accuracy on the small details prevents notices later.

Name, Business Name, and Tax Classification

Line 1 asks for your legal name exactly as it appears on your tax return. Sole proprietors put their individual name here, not a business name. Corporations, partnerships, and LLCs use the entity’s legal name. A trade name or “doing business as” name goes on Line 2, and you leave Line 2 blank if you don’t have one.³

Line 3a is your federal tax classification: individual/sole proprietor, C corporation, S corporation, partnership, trust/estate, or limited liability company. LLCs also have to enter a code for how the LLC is taxed (P for partnership, C for C corporation, S for S corporation). A single-member LLC that hasn’t elected corporate treatment is a disregarded entity and checks the individual/sole proprietor box instead.³

Your Taxpayer Identification Number

Part I asks for your TIN. Sole proprietors can use either a Social Security Number or an Employer Identification Number, though the IRS encourages the SSN. Corporations, partnerships, and multi-member LLCs use their EIN. Sole proprietors who’d rather not hand out an SSN to every client can apply for an EIN through the IRS at no cost.³

Certification and Signature

Part II carries real weight. Your signature confirms under penalty of perjury that the TIN you provided is correct, that you are not subject to backup withholding (or that you’re exempt), and that you are a U.S. person. Providing a false statement that results in no backup withholding brings a $500 civil penalty, and willful falsification can lead to criminal charges.³

Electronic signatures are valid when the requester’s system meets IRS standards: it has to verify the signer’s identity, use the same perjury language, capture the submission as a final authenticated entry, and produce a hard copy on request.⁴

Exempt Payees

Some entities are not subject to backup withholding or standard 1099 reporting and can claim an exemption on Line 3b using an exempt payee code. The exemption most commonly applies to corporations, tax-exempt organizations under Section 501(a), federal and state government agencies, and registered securities dealers.⁴

The corporate exemption has one catch that trips people up. Payments to corporations for medical and healthcare services, attorney’s fees, and services paid by federal executive agencies are not exempt from reporting. Paying a law firm organized as a corporation still means issuing a 1099 for those fees.⁴

A separate line handles FATCA (Foreign Account Tax Compliance Act) exemption codes. Those primarily apply to accounts held outside the United States and are irrelevant for most domestic business relationships.³

What Happens If You Don’t Return a W-9

If you don’t provide a completed W-9, the payer must withhold 24 percent of every payment to you and send it to the IRS. This is called backup withholding, and it continues until you supply a valid TIN.⁵

The same 24 percent applies if the IRS tells the payer that the TIN you provided is wrong, or if you’ve previously failed to report interest and dividend income. The rate doesn’t change based on the trigger.⁵

For contractors, the practical cost is steep. Nearly a quarter of every payment disappears until you file your return and claim credit for the amounts withheld. Submitting a correct W-9 promptly is the easy fix.

When to Update Your W-9

You need to give the requester an updated W-9 when your name changes, your TIN changes, or you convert from one entity type to another. If you previously claimed exempt status and are no longer exempt, the IRS specifically requires you to update any payer from whom you expect future reportable payments.³

How Your W-9 Becomes a 1099

The W-9 exists to make 1099 reporting possible. Your name, TIN, and address transfer directly from the W-9 onto the appropriate 1099 form at year-end.

For 2026, the reporting threshold changed. Under federal legislation signed in 2025, businesses report non-employee compensation on Form 1099-NEC only when payments to a single payee reach $2,000 or more during the calendar year. The same $2,000 threshold applies to Form 1099-MISC, which covers rent, prizes, and other miscellaneous income. The threshold will be adjusted for inflation starting in 2027. Before 2026, it was $600.⁶

The IRS runs automated matching between 1099 data and the tax returns filed by recipients. A mismatch between the name or TIN on the 1099 and the IRS database gets flagged, which can lead to a CP2100 notice to the payer, backup withholding on future payments to you, or penalties. Keeping the W-9 consistent with what appears on your tax return heads off the problem.

Protecting the Information on Your W-9

A completed W-9 contains either your SSN or EIN, so treat it like the sensitive document it is. Confirm the request is legitimate before you fill anything out. A real payer has an actual business relationship with you and a clear reason to report payments. Unsolicited requests, especially by email from unfamiliar companies, deserve a call to the business at a number you find independently.

Sole proprietors who want to keep their SSN out of circulation can apply for an EIN and put that on the W-9 instead. The IRS permits this.³

Don’t send a W-9 as an unencrypted email attachment. A secure upload portal is best. A password-protected PDF, with the password sent separately, is a reasonable fallback. Once a payer has your W-9, you don’t need to send a new one for every invoice, so keep the document off the wire as much as possible.

1
Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
2
Internal Revenue Service. Forms and Associated Taxes for Independent Contractors
3
Internal Revenue Service. Form W-9 (Rev. March 2024)
4
Internal Revenue Service. Instructions for the Requester of Form W-9
5
Internal Revenue Service. Backup Withholding
6
Internal Revenue Service. Form 1099 NEC and Independent Contractors