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taxpayer identification number (TIN)

taxpayer identification number (TIN) definition - business

taxpayer identification number (TIN)

For an individual, his or her Social Security number. For a business or fiduciary, its Employer Identification Number (EIN). Employers are required to have a new employee certify his or her taxpayer identification number on IRS Form W-9.

The American Heritage® Dictionary of Business Terms Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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