If you have an EIN, use it on your business returns. But if you get a W-9 from a person or company, use whatever is on that form (their SSN or EIN) when you issue 1099s to that business or person. If you are giving someone else a W-9, use your EIN if they are paying you for business transactions OR use your SSN if they are paying you for personal things unrelated to your business. @hjs738
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