I would like to look up a taxpayer identification number at the IRS' website. How is this done?

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To use the IRS' Taxpayer Identification Number Matching program, you must first complete a two-step registration process on the IRS website. You are required register individually, using personal tax data such as your social security number and other information. No separate corporate registration exists -- i.e., one that would allow you to register without supplying your personal tax data.

The e-services link takes you to the appropriate registration page. There you also will find answers to frequently asked questions, as well as an online registration tutorial.

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