If you are required to file your taxes with an IP PIN, be looking for it in the mail or retrieve it from www.irs.gov/ippin An Identity Protection PIN (IP PIN) is a six-digit number that prevents someone else from filing a tax return using your Social Security number or Individual Taxpayer Identification Number. The IP PIN is known only to you and the IRS. It helps them verify your identity when you file your electronic or paper tax return. YOU CANNOT FILE ELECTRONICALLY WITHOUT YOUR IP PIN! #tax