PTIN stands for Preparer Tax Identification Number. This was originated by the IRS in 1999 to protect the identity of professional tax return preparers. Prior to that time, preparers were required to list their social security number on the prepared return. This, obviously, was a good move that preparers readily accepted as it helped protect their identity. It was simple. You applied for the PTIN, paid no fee, and it was presumably good for life.

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