The umbrella term 'taxpayer identification number' (TIN) signifies all tracking numbers used by the IRS to organize tax filings by individuals and entities. Several varieties of TIN exist.
First-time PTIN applicants can also apply for a PTIN online. Click over to the Tax Pros section of the IRS website at IRS.gov/taxpros and select the "Renew or Register" button. Choose "Create an ...