You are supposed to have everyone fill out About Form W-9, Request for Taxpayer Identification Number (TIN) and Certification before working for you. You need to get it done now. Then, if they refuse to fill out the form, you can mark that they refused to fill out the form. The IRS will look at their name, address, and figure it out eventually. The person should fill the form out for you. You are required to retain the forms.
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