Taxpayer identification numbers TIN Internal Revenue Service
We strongly suggest that you get certified copies of all your documents instead of sending originals. We also suggest you send the application and documents by certified mail so you’ll have evidence of when you filed the application and where you sent it. Beginning January 1, 2011, if you are a paid tax preparer you must use a valid Preparer Tax Identification Number (PTIN) on returns you prepare. If you do not have a PTIN, you must get one by
