I work with a contractor who is a sole proprietor. His tax is is his social security number. However, QB wort let me enter the SSN into the Tax ID field for the vendor.

I appreciate you for taking the time to reach out in the Community for assistance, Adam.
 

To successfully save and add a contractor, it's essential that you provide all the necessary information on your contractor profile. 
 

Here's how:

1. Click on the pencil icon located on the right-hand side.

2. Select "Individual" as the Contractor type.

3. Enter the contractor's First and Last Name, as well as their Display Name.

4. Make sure to enter the Social Security Number in the correct format.

5. Enter the contractor's Address, including City, State, and Zip code.

6. Click Save.

I've included this article to help you manage and get your financial transactions accurate and get your business ready for the coming year: Year-end guide for QuickBooks Online.

For more contractor-related questions, you can always reply to this post. I'm always available to support. Have a great day.