Thanks for posting to the Community, @julianne1030.

I suggest contacting the IRS to know more about where the US payer has come to determine the treaty for each country.

Here are the phone numbers:

• 800-829-1040 for individuals.
• 800-829-4933 for business tax questions.

Or check this article to find details on tax forms, withholdings, unemployment, and other tax, e-file and pay information, general state, and agency information, and employer registration: Internal Revenue Service Payroll Tax Compliance.

You can also refer to this article to find out more about payroll tax regulations for each state: Payroll Tax Compliance Links.
 

Please feel free to leave a message if you have follow-up questions. I'll be around to help. Enjoy your day!