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What is a tax ID number and how is it used?

What is a tax ID number? It's a unique nine-digit number issued by the Social Security Administration or the IRS to anyone ...
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How to Fill Out a W-9 Form: Request for Taxpayer Identification Number and Certification

What Is Form W-9: Request for Taxpayer Identification Number (TIN) and Certification? Form W-9, Request for Taxpayer Identification Number (TIN) and Certification, is an Internal Revenue Service (IRS) ...