You should use the business's EIN if the payment was for activity related to your business. The IRS will be able to connect it either way, but it could cause confusion or delays, and since your business can deduct the payment on Schedule C, it should be linked to the business' EIN. The recipient can report it with either number, but if your business has an EIN, you should use it for business related documents. If the payment was not business related (personal), use your own SSN.
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