How to Fill Out Form W-9

If a client, bank, or payment platform has asked you for a Form W-9, you are not in trouble, you are simply being set up to be paid correctly, and filling it out accurately the first time saves you from backup withholding headaches later. The form looks intimidating, but it only asks for a handful of things.

Form W-9 is an IRS form you give to a person or business that needs to report payments made to you. It collects your name, tax classification, and Taxpayer Identification Number so the requester can issue a correct information return, such as a 1099. You complete it once and return it to the requester, not to the IRS.

What is Form W-9 used for?

Form W-9, Request for Taxpayer Identification Number and Certification, exists so the business paying you can collect your correct TIN. According to the IRS, Form W-9 is used to provide that number to whoever must file an information return reporting money paid to you.

That information return is most often a 1099. If you do freelance work, earn interest, receive rents, or sell certain services, the payer uses your W-9 details to report those amounts to the IRS at year-end and to send you a matching copy.

Who needs to fill out a W-9?

You generally complete a W-9 when someone needs to report payments or transactions tied to your tax ID. Common situations include:

Independent contractors and freelancers who will receive a 1099-NEC
Vendors and consultants billing a business for services
Account holders opening a bank or brokerage account that pays interest or dividends
Landlords receiving rent reported by a property manager
Participants in real estate transactions, debt cancellations, or certain IRA activity

If you are an employee, you fill out a W-4 instead, not a W-9. The W-9 is for people and businesses paid as non-employees. If you run your own business, tracking your income alongside your business deductions keeps your reporting clean from day one.

How to fill out Form W-9 step by step

Download the current version directly from IRS.gov so you are using the latest revision, then work through it line by line.

Line 1 – Name. Enter your name exactly as it appears on your income tax return. For a sole proprietor, this is your personal name even if you operate under a business name.
Line 2 – Business name. Enter your business, trade, or “doing business as” (DBA) name if it differs from Line 1. Leave blank if it does not apply.
Line 3 – Federal tax classification. Check the single box that matches your status: individual/sole proprietor, C corporation, S corporation, partnership, trust/estate, or LLC. For an LLC, you also note how it is taxed.
Line 4 – Exemptions. Most individuals leave this blank. Certain entities enter exemption codes for backup withholding or FATCA reporting here.
Lines 5 and 6 – Address. Enter the address where the requester should mail your information returns.
Part I – Taxpayer Identification Number. Enter your Social Security Number, or your Employer Identification Number if you have one for your business. Provide only one.
Part II – Certification. Sign and date to certify that your TIN is correct, that you are not subject to backup withholding (unless you are), and that you are a U.S. person.

Choosing the right tax classification on Line 3

Line 3 trips up more filers than any other part of the form. Check only one box, and make sure it matches how the IRS actually taxes you, not just how you think of your business.

Your situation	Box to check	TIN to use
Freelancer, no entity	Individual/sole proprietor	SSN (or EIN if you have one)
Single-member LLC, default taxation	Individual/sole proprietor	Usually your SSN or EIN
LLC taxed as S corp	LLC, then enter “S”	EIN
LLC taxed as partnership	LLC, then enter “P”	EIN
Corporation	C corp or S corp	EIN

A single-member LLC is a frequent point of confusion: by default it is “disregarded,” so you typically check the individual/sole proprietor box rather than the LLC box. If you have elected corporate treatment, that changes. When in doubt, confirm your classification before signing.

Worked example: a freelancer completing a W-9

Imagine Priya, a freelance copywriter who works as a sole proprietor under the name “Bright Words.” A new client asks for her W-9 before paying her first invoice.

Line 1: Priya Sharma (her legal name)
Line 2: Bright Words (her DBA)
Line 3: Individual/sole proprietor
Part I: Her SSN, since she has not obtained an EIN
Part II: She signs and dates the certification

She returns the completed form directly to her client. At year-end, the client uses it to issue her a 1099-NEC. The form never goes to the IRS itself, and Priya keeps a copy for her records. Keeping organized records like this also supports stronger year-round tax planning.

What is backup withholding and how do you avoid it?

Backup withholding is a flat percentage the payer must withhold from your payments and send to the IRS if there is a problem with your W-9, such as a missing or incorrect TIN, or if the IRS has notified the payer to withhold. It is a precaution, not a penalty for honest filers. Verify the current backup withholding rate on IRS.gov, as it can change.

You avoid it by giving a correct, matching name and TIN and by signing the certification truthfully. If you have been notified that you are subject to backup withholding for underreporting interest or dividends, you must cross out the relevant certification language as the form instructs.

How to keep your W-9 information secure

A W-9 contains your full TIN, which makes it a prime target for identity theft. Protect it carefully.

Verify the requester is legitimate before sending anything; scammers impersonate clients and the IRS to harvest W-9 data.
Send it securely through encrypted email, a secure portal, or in person, never as a plain attachment to an unverified address.
Use an EIN instead of your SSN where possible to keep your personal number off the form.
Never email it to “the IRS”; the IRS does not request W-9s directly, since the form goes to your payer.

Frequently asked questions

Do I send Form W-9 to the IRS?

No. You return Form W-9 to the person or business that requested it, typically a client, bank, or payer. They keep it on file and use the information to prepare your year-end information return, such as a 1099. The IRS never receives the W-9 itself.

Should I use my SSN or EIN on a W-9?

Either can be valid depending on your structure, but use only one. Sole proprietors can use an SSN or an EIN. Many freelancers obtain an EIN specifically so they can keep their Social Security Number off the form, which reduces identity-theft exposure with multiple clients.

What happens if I refuse to provide a W-9?

If you do not supply a correct W-9 when required, the payer must apply backup withholding to your payments and send that money to the IRS. You may also face penalties for providing false information. It is almost always better to complete the form accurately.

How often do I need to fill out a W-9?

You generally complete a new W-9 for each new payer, and again whenever your information changes, such as a new name, address, business structure, or TIN. There is no annual requirement; an existing W-9 stays valid with a payer until your details change.

Can a foreign person use Form W-9?

No. Form W-9 is for U.S. persons, including U.S. citizens and resident aliens. Foreign individuals and entities generally provide a Form W-8 instead. The certification on the W-9 specifically requires you to confirm that you are a U.S. person, so verify your status on IRS.gov if unsure.

Book a free consultation

Getting your W-9 right is a small task with big consequences for how you are paid and taxed. If you handle contractors, juggle multiple clients, or are unsure of your tax classification, we can help. Tranzesta works with US and UK clients to keep paperwork clean from day one. Book a free consultation with Tranzesta today.

Disclaimer: This article is for general informational purposes only and does not constitute tax, legal, or accounting advice. Tax rules and figures change and depend on your situation and tax year. Always verify current IRS figures and consult a qualified tax professional before acting.