What Is a W-9 Form? Who Fills It Out and Why

A W-9 is a one-page IRS form that a contractor, freelancer, or vendor fills out and gives to the business paying them, so that business has the taxpayer information it needs to report the payments. You do not send a W-9 to the IRS; the payer keeps it on file and uses it to issue a 1099 after year-end. It collects your name, tax classification, and taxpayer ID number (your SSN or EIN).

What Form W-9 is for

The full name is Form W-9, Request for Taxpayer Identification Number and Certification. When a business hires you as an independent contractor and expects to pay you, it needs your taxpayer ID to report those payments to the IRS later. Rather than guess, it asks you to complete a W-9. You fill it in, sign it, and hand it back. The company files it away and uses it when it prepares information returns.

The key thing to understand: the W-9 never goes to the IRS. It moves between you and the payer only. That is different from almost every other tax form, and it is why a W-9 is not something you file with your return.

What information a W-9 collects

You sign the certification under penalty of perjury, so the numbers need to be right. If your name and TIN do not match IRS records, the payer can be told to start backup withholding, covered below.

W-9 vs W-4: contractor versus employee

People mix these up because both collect tax information at the start of a working relationship, but they point in opposite directions. A W-4 is for employees; a W-9 is for contractors.

If you are handed a W-9, you are being treated as self-employed for that work. That means the tax is yours to handle, usually through quarterly estimated payments, and you can deduct business expenses against the income on Schedule C. Not sure which category you belong in? Our guide on 1099 versus W-2 breaks down the difference.

How the W-9 leads to a 1099

The W-9 is the setup; the 1099 is the payoff. After the calendar year ends, the payer takes the information from your W-9 and, if you were paid enough, issues you a Form 1099-NEC reporting your total nonemployee compensation. A copy goes to the IRS, which is how the government knows to expect that income on your return.

The reporting threshold is changing. For payments made through 2025, a business generally issues a 1099-NEC once it pays you $600 or more in the year. For payments made on or after January 1, 2026, that threshold rises to $2,000 and will be indexed for inflation. Either way, you owe tax on your income whether or not you receive a 1099, so keep your own records. If you are on the paying side and cut checks to a roster of contractors and vendors, tools that handle accounts payable and vendor payment records make collecting W-9s and issuing 1099s far less manual.

Backup withholding: what goes wrong without a valid W-9

Backup withholding is the penalty for a missing or wrong taxpayer ID. If you do not give the payer a valid TIN, or the IRS notifies the payer that your TIN is incorrect or that you underreported income, the payer must withhold 24 percent of your payments and send it to the IRS. You get credit for it on your return, but you lose the use of that money all year. Filling out the W-9 correctly and promptly is the simplest way to avoid it.

Who does not need a W-9

Not every payment triggers a W-9. Payments to corporations are generally exempt from 1099-NEC reporting, with a few exceptions such as payments to attorneys and for medical or health-care services. Personal, non-business payments do not require a W-9 either: if you pay a neighbor to mow your lawn, no form is involved. The W-9 and 1099 system applies to payments made in the course of a trade or business.

Frequently asked questions

What is a W-9 form used for?

A W-9 gives a business the taxpayer information it needs to report payments it makes to a contractor or vendor. The payee fills it out with their name, tax classification, and taxpayer ID number, then returns it to the payer. The payer keeps it on file and uses it to issue a Form 1099 after the year ends. It is never sent to the IRS.

Who fills out a W-9?

The independent contractor, freelancer, or vendor being paid fills out the W-9 and gives it to the business paying them. Employees do not use a W-9; they complete a W-4 instead. If a company asks you for a W-9, it is treating you as self-employed and will report your pay on a 1099-NEC rather than a W-2.

Do I send my W-9 to the IRS?

No. You give your completed W-9 only to the business that requested it. That payer keeps it in its records and uses the information to prepare your 1099. Because it contains your Social Security number or EIN, share it only with a payer you trust and through a secure method, never over unsecured email.

What is the difference between a W-9 and a 1099?

A W-9 collects your taxpayer information at the start of a working relationship; a 1099-NEC reports the money you were actually paid at the end of the year. The payer uses the W-9 to fill out the 1099. You provide the W-9 once, then receive a 1099 each year you are paid above the reporting threshold.

What happens if I do not provide a W-9?

If you do not provide a valid taxpayer ID, the payer must apply backup withholding and send 24 percent of your payments to the IRS. You get credit for that amount on your tax return, but you lose access to the cash during the year. Completing the W-9 accurately avoids the withholding entirely.

TaxFile is self-prepared tax software and does not provide personalized tax advice. For a complex situation, consult a CPA or tax professional.