How to Fill Out a W-9 Form: Step-by-Step (2026 Instructions)
The definitive line-by-line guide to filling out IRS Form W-9 accurately for independent contractors, freelancers, and single-member LLCs.
Key Takeaways & Executive Summary
Quick Summary: Form W-9 at a Glance
- Line 1: Always enter your legal personal name as filed with the IRS.
- Line 2: Enter your trade name or DBA (only if different from Line 1).
- Line 3: Check your federal tax classification (Individual, LLC, C-Corp, S-Corp, Partnership).
- Lines 5–6: Enter your deliverable mailing address for Form 1099 delivery.
- Part I: Enter your 9-digit SSN or EIN.
- Part II: Sign and date certifying you are not subject to backup withholding.
What Is Form W-9 & Who Needs to Complete It?
IRS Form W-9 (Request for Taxpayer Identification Number and Certification) is the official federal document used by businesses and clients to collect the legal name, address, and Taxpayer Identification Number (SSN or EIN) from U.S. independent contractors, freelancers, vendors, and LLCs paid $600 or more in a calendar year. Form W-9 does not withhold taxes; instead, payers keep it on file to accurately issue Form 1099-NEC at year-end and prevent mandatory 24% backup withholding under IRC § 3406.
Unlike a Form W-4 (which employees complete so an employer can withhold federal income and FICA payroll taxes), Form W-9 certifies that you are an independent non-employee responsible for calculating and paying your own self-employment taxes.
Form W-9 Quick Reference Field Table
| Form W-9 Field | What to Enter | IRS Filing Rules |
|---|---|---|
| Line 1: Legal Name | Your legal individual or entity name | Must match name on federal tax return. Single-member LLC owners put their personal name here. |
| Line 2: Business Name | DBA, Trade Name, or LLC Name | Optional for sole proprietors. Single-member LLCs enter company name here. |
| Line 3: Tax Status | Check ONE entity classification box | Individual/Sole Proprietor, C-Corp, S-Corp, Partnership, or LLC (specify C, S, or P). |
| Line 4: Exemptions | Exempt payee or FATCA code | Individuals and sole proprietors leave blank. Used by corporations and non-profits. |
| Lines 5 & 6: Address | Street address, City, State, ZIP | Where your client will mail Form 1099-NEC. P.O. Box is accepted. |
| Part I: Tax ID (TIN) | 9-digit SSN or EIN | Sole proprietors may use SSN or EIN. Corporations and multi-member LLCs must use EIN. |
| Part II: Certification | Legal signature & date | Certifies under penalty of perjury that your TIN is correct and you are not subject to backup withholding. |
Step-by-Step Field Instructions (Lines 1 to 7)
Line 1: Legal Name (As Shown on Your Tax Return)
Enter your full legal personal name. If you are an individual freelancer or sole proprietor, this must be your legal first and last name (e.g., John Doe). Never enter a nickname or business trade name on Line 1.
Line 2: Business Name / Disregarded Entity Name
Enter your DBA (Doing Business As), trade name, or company name if different from Line 1. If you operate solely under your personal name, leave Line 2 completely blank.
Line 3: Federal Tax Classification
Check only ONE box that corresponds to your IRS tax filing status:
- Individual / Sole Proprietor: Freelancers and single-member LLCs that have not elected corporate status.
- C Corporation / S Corporation: Incorporated businesses that file Form 1120 or 1120-S.
- Partnership: Multi-member unincorporated enterprises filing Form 1065.
- Limited Liability Company (LLC): Enter
Cfor C-Corp,Sfor S-Corp, orPfor Partnership.
Part I: Taxpayer Identification Number (TIN)
You must provide your 9-digit Taxpayer Identification Number. Enter either your Social Security Number (SSN) or your Employer Identification Number (EIN).
Part II: Certification & Signature
Sign and date the form. You are legally certifying under penalties of perjury that: (1) your TIN is correct, (2) you are not subject to backup withholding, and (3) you are a U.S. citizen or permanent resident.
Special Rule for Single-Member LLC Owners
If you own a Single-Member LLC that has not elected to be taxed as an S-Corp or C-Corp, the IRS classifies your business as a "disregarded entity." By federal statute, you must enter the owner's individual legal name on Line 1 and the LLC name on Line 2. Putting the LLC name on Line 1 will trigger an automatic IRS CP2100 Notice (Name/TIN Mismatch).
SSN vs. EIN: Protecting Your Privacy on Form W-9
One of the most common dilemmas for freelancers is whether to provide their Social Security Number or apply for an Employer Identification Number:
Using Your Social Security Number
Convenient and legally standard for sole proprietors, but exposes your sensitive personal ID number across multiple client accounting departments.
Using an Employer ID Number
Sole proprietors can obtain a free EIN from IRS.gov in under 10 minutes. Using an EIN shields your personal SSN from email threads and vendor databases.
5 Critical W-9 Mistakes to Avoid
Continue Your W-9 Education
Frequently Asked Questions
Statutory References & Legal Citations
This publication is audited against official federal statutes, Treasury regulations, and published IRS bulletins. Verified primary source references are provided below for independent legal and accounting cross-examination.
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