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Avoid Errors

6 Common W-9 Mistakes (And How to Fix Them)

Small errors on your W-9 can lead to payment delays, backup withholding, or IRS notices. Here are the most common mistakes and how to avoid them.

Mistake #1

Using your business name on Line 1

Why it's a problem: Line 1 must be your legal name as shown on your tax return. If you're a sole proprietor or single-member LLC, this is your personal name, not your business name.

How to fix it: Put your legal name on Line 1. Your business name or DBA goes on Line 2.

Mistake #2

Checking the wrong tax classification

Why it's a problem: Many people check 'LLC' when they should check 'Individual/sole proprietor.' Your tax classification is how the IRS taxes you, not your legal entity type.

How to fix it: Single-member LLCs taxed as sole proprietorships should check 'Individual/sole proprietor or single-member LLC.'

Mistake #3

Leaving the TIN blank or incomplete

Why it's a problem: Without a valid TIN, the payer must withhold 24% of your payments (backup withholding).

How to fix it: Enter your complete SSN or EIN. Double-check the numbers before submitting.

Mistake #4

Using an old address

Why it's a problem: 1099 forms are mailed to the address on your W-9. An outdated address means you might not receive your tax documents.

How to fix it: Always use your current mailing address. Update your W-9 whenever you move.

Mistake #5

Not signing the form

Why it's a problem: An unsigned W-9 is invalid. The payer can't use it for tax reporting and may apply backup withholding.

How to fix it: Sign and date Part II. Electronic signatures are acceptable.

Mistake #6

Mixing up SSN and EIN formats

Why it's a problem: SSNs are formatted as XXX-XX-XXXX. EINs are formatted as XX-XXXXXXX. Using the wrong format can cause IRS matching issues.

How to fix it: Use the correct format for your TIN type and enter it in the appropriate field.

What Happens If You Make a W-9 Mistake?

W-9 errors can cause several problems:

  • Payment delays: The payer may hold your payment until you provide a corrected W-9
  • Backup withholding: 24% of your payments may be withheld and sent to the IRS
  • IRS notices: Mismatched name/TIN combinations trigger B-notices from the IRS
  • 1099 errors: Your 1099 will have incorrect information, complicating your tax return

How to Correct a W-9

If you realize you made an error on a submitted W-9, simply fill out a new W-9 with the correct information and send it to the requester. There's no special correction form — the most recent W-9 on file supersedes any previous versions.

If your 1099 was already filed with incorrect information, contact the payer to request a corrected 1099-NEC.

W-9 Best Practices

  • Double-check your TIN: Verify every digit of your SSN or EIN before submitting
  • Use your tax return name: The name on Line 1 should match your tax return exactly
  • Keep a copy: Save a copy of every W-9 you submit for your records
  • Update when things change: Submit a new W-9 if your name, address, or tax classification changes
  • Don't leave fields blank: Complete all required fields to avoid processing delays

Create an error-free W-9

Our online form guides you through each field to avoid common mistakes.

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