Your federal tax identification number is provided to you by the IRS. If you already obtained your federal tax ID but cannot find it, look at your prior tax returns. If you do not have copies of them, contact the IRS.Continue Reading
If you keep copies of your taxes, take these out for review.
Review these forms. Your tax identification number is listed on each of these tax papers.
If you need further assistance, call the IRS for assistance at 800-772-1213.