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How does TIN Matching over the Internet work?

Enrolled users may TIN Match in one of two ways:

  1. a) Interactively – a user can submit up to 25 name/TIN combinations at a time during a session, and receive a response within 5 seconds.
  2. b) Bulk – users may download .txt files composed of up to 100,000 name/TIN combinations and receive a response from IRS within 24 hrs.

For additional information see Publication 2108a, Online TIN Matching Program.