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Taxpayer Identification Number (TIN)

The number the IRS uses to identify a taxpayer — for an individual usually a Social Security Number, and for a business an Employer Identification Number (EIN). A W-9 certifies your name and TIN to a payer so they can report payments correctly; a mismatch can trigger backup withholding.

Related forms

W-9 form

W-9 vs. W-4 vs. 1099: which tax form do you need?
Which form you need comes down to one question: are you an employee or a contractor? An employee fills out a W-4 so the employer withholds tax. A contractor fills out a W-9 to give the payer their taxpayer ID. The 1099 is filed by the payer to report what it paid.

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