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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 who pays taxes. Learn more here.
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EIN vs. TIN: What’s the difference and which do you need?

Curious about EIN vs. TIN? An EIN is a type of tax number used by businesses and organizations, but not all tax ID numbers are EINs. Here's what to know.