A W-9 is a form you fill out so a business or organization knows your tax ID before they pay you

The W-9 is a one-page IRS form titled "Request for Taxpayer Identification Number and Certification." When someone plans to pay you money — whether you're a contractor, freelancer, consultant, or vendor — they often ask you to complete a W-9 first. The form tells them your name, address, and tax identification number (usually your Social Security number or an Employer Identification Number if you own a business). The business uses this information to report the payment to the IRS on a 1099 form later.

You don't send the W-9 to the IRS. You give it directly to the person or business paying you. They keep it on file. The W-9 is not a tax return and does not change how much you owe in taxes — it's simply a way for the payer to gather your information before sending money your way.

Key Takeaways

  • A W-9 is a form you complete for a business or person who will pay you money, providing your name, address, and tax ID number.
  • The payer uses your W-9 information to file a 1099 form with the IRS, which reports the income you received.
  • You are not required to have a W-9 on file before receiving payment, but most businesses will not pay you without one.
  • Filling out a W-9 does not increase your tax burden — it simply ensures the IRS knows about the income you earned.
  • You can download a blank W-9 from IRS.gov or ask the payer for their copy.

Who asks for a W-9 and why

Any business or organization that pays a non-employee for work or services may ask for a W-9. This includes freelance platforms, construction companies, consulting firms, medical offices, schools, nonprofits, and government agencies. They request it because IRS rules require them to report payments of $600 or more in a calendar year to the IRS on a 1099-NEC or 1099-MISC form.

The W-9 gives them the correct information to put on that 1099. Without it, they either cannot pay you or must guess at your tax ID, which creates problems for both you and them when the IRS tries to match the 1099 to your tax return. Some payers ask for a W-9 even for payments under $600, simply to have your information on file.

What information goes on a W-9

The W-9 form has several sections. You fill in your full legal name, current address, and tax identification number. For most people, the tax ID is your Social Security number. If you own a business registered with the IRS, you may use an Employer Identification Number (EIN) instead.

The form also asks you to check a box describing what type of entity you are — individual, sole proprietor, partnership, corporation, or other. Most people check "Individual" or "Sole Proprietor." At the bottom, you sign and date the form, certifying that the information is correct and that you are a U.S. citizen or resident alien.

How to get and fill out a W-9

You can obtain a blank W-9 form in two ways. The first is to visit IRS.gov, search for "Form W-9," and download the PDF. The second is to ask the business or person paying you for a copy — they usually have one ready or can email it to you.

Fill it out by hand or on your computer, print it, sign and date it, and return it to the payer. Some organizations now accept digital signatures or allow you to fill it out and sign it electronically through their system. Ask the payer how they prefer to receive it and where to send it.

What happens after you submit a W-9

Once you submit the W-9, the payer keeps it in their records. When they pay you, they note the amount. At the end of the calendar year, if the total payments to you reached $600 or more, they file a 1099 form with the IRS and send you a copy. The 1099 reports the income you earned from that payer.

You then use the 1099 information when you file your own tax return. If you received 1099s from multiple payers, you report all of that income. The IRS receives copies of all the 1099s filed, so they can cross-check your tax return against the income reported by your payers.

Do you have to fill out a W-9

Technically, you are not legally required to complete a W-9 before receiving payment. However, in practice, most businesses will not pay you without one. Some may delay payment until you provide it. If you refuse to give a W-9, the payer may report your income to the IRS without your tax ID, which can cause matching problems and may trigger IRS notices to you later.

If you have a legitimate reason not to provide a W-9 — for example, you are a foreign national without a U.S. tax ID — tell the payer immediately. They may have an alternative form or process for you, such as a W-8BEN for foreign contractors.

W-9 vs. W-4: what's the difference

A W-9 and a W-4 are different forms for different situations. A W-9 is for non-employees — contractors, freelancers, and vendors. A W-4 is for employees and tells your employer how much tax to withhold from your paycheck. If you are hired as an employee, you fill out a W-4, not a W-9. If you are hired as a contractor or freelancer, you fill out a W-9.

The key difference is withholding. When you complete a W-4, your employer automatically deducts federal income tax from each paycheck. When you complete a W-9, no tax is withheld — you receive the full payment and are responsible for paying taxes on it yourself, usually through quarterly estimated tax payments or when you file your annual return.

Frequently Asked Questions

What if I don't have a Social Security number?

If you are a non-U.S. citizen or resident alien, you may have an Individual Taxpayer Identification Number (ITIN) instead. You can use your ITIN on the W-9. If you are a foreign contractor with no U.S. tax ID, ask the payer whether they can accept a W-8BEN form instead, which is designed for foreign workers.

Can a W-9 be used to verify my identity?

No. A W-9 is a tax form, not an identity document. It does not prove who you are. If someone asks you to complete a W-9 as proof of identity — especially in a context unrelated to payment for work — be cautious, as this may be a scam.

What if I make a mistake on my W-9?

If you notice an error after submitting it, contact the payer immediately and provide a corrected form. They should update their records. If the payer has already filed a 1099 with incorrect information, you can file an amended tax return to correct your reported income.

Do I need a W-9 if I'm paid in cash?

Yes. The payment method does not matter. If a business pays you cash and the total reaches $600 or more in a year, they are still required to file a 1099 and should have a W-9 on file. Cash payments are still taxable income and must be reported.