W-9 Guides
In-depth guides on every part of filling out and handling Form W-9.
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What Is It
What Is a W-9 Form? Complete Plain-English Guide
Form W-9 is how someone paying you collects your Taxpayer ID. Here's what it is and why.
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How-To
How to Fill Out a W-9: Pick Your Classification
Exactly how to fill out Form W-9 for your tax classification, step by step.
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TIN Type
TIN, SSN, or EIN: Which Goes on Your W-9?
Which Taxpayer ID to use, SSN for individuals, EIN for businesses, and the gray area.
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LLCs
W-9 for LLCs: Single-Member, Multi-Member, S-Corp
The box that confuses every LLC owner, decoded for each tax election.
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When
When You Need a W-9 Form
All the situations that require a W-9, plus when you don't need one.
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Backup
Backup Withholding Explained: The 24% Penalty
What backup withholding is and how to avoid having 24% of payments withheld.
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Mistakes
Common W-9 Mistakes and How to Avoid Them
The most common W-9 errors and how to fix them before they cause problems.
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Foreign
Foreign Person? Use W-8 Instead of W-9
If you're not a U.S. person, you need a W-8. Here's which one and why.
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W-9 vs 1099
W-9 vs 1099: What's the Difference?
Two ends of the same process. How they connect and what to do with both.
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W-9 vs W-4
W-9 vs W-4: What's the Difference?
Both collect taxpayer info, but for very different working relationships.