How To Fill Out Form W-9 For 1099 Work

by | | Taxes

This post shows you how to fill out Form W-9 when you start a new 1099 engagement.

Purpose Of Form

When you start a new 1099 gig, they’ll probably ask you to fill out IRS Form W-9, “Request for Taxpayer Identification Number and Certification.”

No big deal. It’s just a simple one-pager that says, “Here’s my tax ID number so you can issue me a 1099 at tax time.”

Sample Completed Forms

You only need to fill out a few fields, then sign and date. The rest you can skip.

These samples show you how to fill out Form W-9 in specific cases. The next section of this post explains the cases in more detail.

Taxpayer ID Number

The form asks for Taxpayer Identification Number (TIN).

You fill in either your Social Security Number (SSN) or your Employer Identification Number (EIN). Not both.

In most cases, you’ll fill in your SSN. You may not even have an EIN; many locums docs don’t need one.


Fill in your SSN if you’re taxed as a sole proprietor.

You’re taxed as a sole proprietor if:

In the above cases, if you have an EIN for yourself, you can use it instead of your SSN if you want to.


Fill in your LLC’s EIN if:

  • You have an LLC and you’re taxed as an S corporation.

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