How do I fill out my US contractor tax form (W-9)?

Last updated: August 19, 2026

Applies to: US independent contractors (1099 / corp-to-corp). Employees complete a W-4 instead; international contractors complete a W-8BEN / W-8BEN-E.

Summary: The Form W-9 gives Ascen your legal name and taxpayer identification number (TIN) so your payments can be reported on a 1099-NEC. You complete it during onboarding, and you can't be paid without a valid W-9 on file — payouts are blocked until it's complete.

What the W-9 is for

No taxes are withheld from independent-contractor payments. Instead, what you're paid is reported to the IRS on a 1099-NEC — and the W-9 is where that reporting information comes from.

How to complete it

You'll hit the W-9 step during your onboarding in the Ascen platform:

  1. Name — your legal name exactly as it appears on your tax return. If you operate through a business entity, use the entity's legal name and put any DBA on the business-name line.

  2. Federal tax classification — individual/sole proprietor, LLC (with its tax treatment), or corporation, matching how your entity actually files.

  3. TIN — your SSN or, generally, an EIN if you are a sole proprietor; entities should use an EIN. The name + TIN combination must match IRS records — mismatches cause reporting problems and can trigger backup withholding.

  4. Certify and sign electronically.

Why it blocks your payments

A valid W-9 is required before any distribution can be sent to you. If your W-9 is missing or invalid, your payments hold until it's fixed — this is the first thing to check if you're onboarded but haven't been paid.

Keeping it current

Submit an updated W-9 if your legal name, entity, or TIN changes (for example, you incorporate and switch from SSN to EIN). Email Ascen at support@ascen.com if you need to replace the form on file.

  • When will I get my 1099-NEC?

  • Am I a W-2 employee or an Independent Contractor (1099)? (US)

  • How do I fill out my tax forms? (all worker types)

This isn't individual tax advice — consult a tax professional for your situation.