IRS · United States

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Form W-9: Request for Taxpayer Identification Number and Certification

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JustFill is not affiliated with IRS. This is an independent third-party tool to help you complete W-9. Always download the current blank form from the official source and verify your completed copy before signing or submitting. Official W-9 from IRS

Quick answer

Form W-9, Request for Taxpayer Identification Number and Certification, is an IRS form that a payer uses to collect your name, address, and taxpayer identification number (SSN or EIN) before paying you, so they can issue a 1099 at year end. You complete and sign it, then give it to the payer — you do not send it to the IRS. With JustFill you upload the blank IRS W-9 PDF, the AI auto-detects every field, you type or dictate your details, and you download the completed W-9 free.

Form
W-9
Issued by
IRS
Country
United States
Cost to fill
Free

What is W-9?

Need to get a W-9 form filled fast? Form W-9 is the IRS document a payer uses to collect your taxpayer identification number (TIN) before they pay you. JustFill is a free W9 filler that lets you complete a digital W-9 online — no printing, scanning, or installs. Most independent contractors, freelancers, and consultants in the United States fill out a W-9 at the start of a new client relationship. The form is short — name, business name, tax classification, address, and your SSN or EIN — but it's required before the payer can issue a 1099 at year end.

Who fills out W-9?

  • Independent contractors and freelancers receiving $600+ from a US payer in a year
  • Sole proprietors invoicing US clients
  • LLCs and corporations providing services to US businesses
  • Vendors registering with a new customer who reports payments to the IRS
  • Anyone opening certain bank or brokerage accounts that require backup withholding info

Field-by-field breakdown

What each section of W-9 asks for. JustFill’s AI will detect these fields automatically when you upload the PDF — review the breakdown below so you know what to enter.

Line 1 — Name

Your legal name as shown on your tax return.

Line 2 — Business name

Disregarded entity name or DBA, if different from Line 1.

Line 3 — Federal tax classification

Check one: individual/sole proprietor, C corp, S corp, partnership, trust/estate, or LLC.

Line 4 — Exemptions

Most filers leave blank. Used by certain corporations and tax-exempt organizations.

Lines 5–6 — Address

Where the payer should mail your 1099 at year end.

Part I — TIN

Your Social Security Number (SSN) for individuals, or your Employer Identification Number (EIN) for businesses.

Part II — Certification

Sign and date. You certify the TIN is correct and you are not subject to backup withholding.

Common mistakes to avoid

  • 1Putting your business name on Line 1 when you are a sole proprietor — Line 1 should be your individual name.
  • 2Leaving the certification unsigned — payers will reject an unsigned W-9.
  • 3Using an old version of the form. The IRS occasionally updates the W-9; always start from the current PDF at irs.gov.

How JustFill helps you complete W-9

AI field detection

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Form W-4: Employee's Withholding Certificate

Frequently asked questions

Yes. The form is issued by the IRS and is free to download and complete. JustFill provides a free fillable interface — there is no charge to complete a W-9.
No. You send the completed W-9 to the payer (client, vendor, or institution) who requested it. They keep it on file and use it to issue a 1099 at year end.
The IRS accepts electronic signatures on W-9s as long as the payer has a system that meets IRS requirements. Many payers accept a typed name or drawn signature. Check with the requester if unsure.
Write "Applied For" in the TIN box and submit your TIN to the payer within 60 days. The payer may begin backup withholding until you provide the number.
Download the current blank W-9 PDF directly from the IRS at irs.gov/forms-pubs/about-form-w-9 — it is free. Then upload that PDF into JustFill to complete it online without printing.
JustFill lets you fill a digital W-9 entirely in your browser. Upload the blank IRS PDF, let the AI auto-detect each field, type or dictate your name, TIN, and address, and download the completed W-9 as a finished PDF.

Official source: W-9 on IRS’s website

JustFill is an independent product and is not affiliated with, endorsed by, or sponsored by IRS or any government agency. Always verify your completed form on the official version before signing or submitting.