Welcome to the Community, @beyondmeals. Allow me to share some information about vendors having the same Tax ID number.

Usually, a given QuickBooks company represents a single business. Multiple contractors with the same tax ID are presently not permitted to use the Intuit 1099 E-File Service. The tax ID you enter for the vendor or contractor should be that person's tax ID, not the corporation paying them.

I'm adding this article as your reference to set up and track contractors' 1099s in QuickBooks: Set up contractors and track them for 1099s in QuickBooks.

You may also check this article to guide you in creating and filing 1099s: Create and file 1099s using QuickBooks Online.

If you need more help with changing contractors' Tax ID numbers, you can click the Reply button below, and I'm always here to help.