What Is a W-9 for a Business? Purpose, Completion, and Withholding

A W-9 for a business is the one-page IRS form that a business uses to give its taxpayer identification number to anyone who needs to report payments made to it, and to collect the same information from contractors and other non-employees it pays. Nothing on the form goes to the IRS directly. The requester keeps it on file and uses the name and TIN later to prepare information returns such as a 1099-NEC or 1099-INT. If your business hires freelancers, opens a bank or brokerage account, closes on real estate, or has debt canceled, a W-9 will usually show up on one side of the transaction or the other.

When Your Business Fills Out a W-9

Another business or a financial institution will send you a W-9 whenever it needs your TIN to file an information return. Common situations:

A client hires your business for services and needs your information before paying you, so it can later issue a 1099-NEC.
A bank or brokerage needs your TIN to report interest or dividends on Form 1099-INT or 1099-DIV.¹
A closing agent or buyer needs to report the proceeds of a real estate sale on Form 1099-S.¹
A lender forgives part of a debt and needs your TIN to report the canceled amount.

A W-9 is not a payroll form. Employees fill out a W-4 for wage withholding; the W-9 is strictly for non-employee relationships, and signing one does not trigger any immediate withholding from your payments.²

When Your Business Requests a W-9 From Someone Else

If your business pays a contractor, freelancer, or other non-employee for services, collect a completed W-9 before making the first payment. The IRS expects you to have the payee’s legal name and TIN on file to accurately report what you paid.³

For the 2026 tax year, you must file a Form 1099-NEC for any contractor you pay $2,000 or more. That is a significant jump from the longstanding $600 threshold, enacted by P.L. 119-21.⁴ Don’t wait until payments approach that line to ask for the form. Chasing tax information months after the fact is one of the most common small-business bookkeeping headaches, and it’s avoidable.

Exempt Payees

Not every entity you pay generates a 1099. Corporations, government agencies, tax-exempt organizations, and certain financial institutions are generally exempt from backup withholding and from 1099 reporting for service payments. They still fill out a W-9, but they enter an exempt payee code to signal that status.⁵ The practical takeaway: if you hire a corporation for consulting work, you typically won’t owe a 1099 at year’s end, but you should still have their W-9 on file.

Foreign Contractors Use a Different Form

The W-9 is only for U.S. persons. A foreign individual or entity should provide a Form W-8BEN (individuals) or W-8BEN-E (entities) instead. These forms certify foreign status and allow the contractor to claim any applicable tax treaty benefits.⁶ If a foreign contractor fails to provide a valid W-8, you’re generally required to withhold 30% of the payment and remit it to the IRS, a steeper rate than the 24% backup withholding that applies to domestic payees.⁷

How to Complete the Form

The form is one page, but the instructions run several because the classification rules for LLCs and disregarded entities trip people up constantly.

Line 1: Legal Name

Enter the name exactly as it appears on your federal tax return. For a sole proprietor, that means the individual’s name. For a corporation or partnership, use the entity’s legal name. The IRS matches this name against the TIN you enter, so even a small discrepancy can flag a mismatch and trigger backup withholding.¹

Line 2: Business Name or DBA

If your business operates under a trade name or “doing business as” name that differs from the legal name on line 1, enter it here. For disregarded entities (typically a single-member LLC), the owner’s name goes on line 1 and the LLC’s name goes on line 2.⁵ If your legal and business names are the same, leave line 2 blank.

Line 3: Federal Tax Classification

Check the box that matches how the IRS classifies your business:

Individual/sole proprietor, for unincorporated one-person businesses.
C Corporation or S Corporation, for incorporated entities taxed under Subchapter C or Subchapter S.
Partnership, for businesses with two or more owners that haven’t elected corporate status.
Trust/Estate, for fiduciary entities.
LLC, in which case you also enter a letter code for how the LLC is taxed: C for C corporation, S for S corporation, or P for partnership.¹

The LLC classification is where most mistakes happen. A multi-member LLC defaults to partnership taxation, while a single-member LLC is a disregarded entity taxed as a sole proprietorship unless it has elected otherwise. If your LLC elected S corporation status with the IRS, check the LLC box and write “S,” not the standalone S corporation box. The January 2026 revision of the requester instructions reinforces this distinction.⁸

Part I: Taxpayer Identification Number

Enter your nine-digit TIN. Sole proprietors and single-member LLCs can use either a Social Security Number or an Employer Identification Number. Corporations, partnerships, and multi-member LLCs use an EIN.¹ If your business doesn’t have an EIN yet, you can apply online at IRS.gov for free and receive the number immediately.⁹

Getting the number wrong has consequences. A payee who furnishes an incorrect TIN faces a $50 penalty per occurrence, and a payer who files an information return with the wrong number faces separate penalties starting at $60 per return for the 2026 tax year, rising to $340 if corrected after August 1.¹⁰

Part II: Certification and Signature

By signing, you certify under penalty of perjury that the TIN is correct and that you are not currently subject to backup withholding (or, if you are, you acknowledge it). Intentionally falsifying a W-9 can lead to criminal penalties including fines and imprisonment.¹ Always download the latest version of the form from IRS.gov, because the revision date matters and requesters may reject outdated versions.

Backup Withholding: What Happens If You Ignore a W-9

If you ignore a W-9 request or provide a TIN that the IRS flags as incorrect, the payer is legally required to withhold 24% from every payment to you and send it to the IRS. This is called backup withholding, and it applies to the full gross amount of each payment, not just the amount above any threshold.¹¹ The rate remains 24% for 2026 under P.L. 119-21, which made the individual tax rates from the 2017 tax law permanent.¹²

Backup withholding is not a fine. It’s a forced prepayment of tax, and you can claim the withheld amount as a credit on your return. But having a quarter of your gross payments diverted in the meantime creates obvious cash flow problems. The simplest way to avoid it is to return a correctly completed W-9 before the first payment arrives.

Where the Completed Form Goes

A completed W-9 goes directly to the person or business that requested it. It is not mailed to the IRS. This is one of the most common misunderstandings about the form. The requester keeps it in their files and uses the information to prepare 1099s at year’s end.¹

Because the form contains your TIN, often a Social Security Number, treat it like any other sensitive financial document. Encrypted email, a secure file-sharing portal, or certified mail are all reasonable delivery methods. Sending an unprotected PDF of your Social Security Number over regular email is the kind of risk that’s easy to avoid and painful to recover from if it goes wrong. If you’re the requester, store paper copies in a locked location and digital copies in an encrypted system.

When to Update a W-9

A completed W-9 stays valid until something changes. If your business changes its legal name, address, or tax classification, provide an updated W-9 to every payer who has the old one on file.⁵ Common triggers include a sole proprietorship incorporating or an LLC electing S corporation status. Skipping the update means the payer may file a 1099 with a mismatched name and TIN, and untangling the backup withholding notices or IRS penalty letters that follow can take months.

1
Internal Revenue Service. Form W-9 (Rev. March 2024)
2
Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
3
Internal Revenue Service. Forms and Associated Taxes for Independent Contractors
4
Internal Revenue Service. 2026 Publication 1099
5
Internal Revenue Service. Instructions for the Requester of Form W-9
6
Internal Revenue Service. Instructions for Form W-8BEN (Rev. October 2021)
7
Internal Revenue Service. Tax Withholding Types
8
Internal Revenue Service. Instructions for the Requester of Form W-9 (Rev. January 2026)
9
Internal Revenue Service. Get an Employer Identification Number
10
Internal Revenue Service. Information Return Penalties
11
Office of the Law Revision Counsel. 26 USC 3406 – Backup Withholding
12
Internal Revenue Service. Publication 15 (2026), (Circular E), Employers Tax Guide