what is my tax id number

Your tax ID number depends on your situation. If you are an individual, your tax ID number is your Social Security Number (SSN) . If you are a business entity, you need an Employer Identification Number (EIN), which is a unique nine-digit number issued by the IRS. You can apply for an EIN with the IRS assistance tool, which will guide you through questions and ask for your name, social security number, address, and your "doing business as" (DBA) name. If you need to retrieve your EIN, you can call the IRS Business and Speciality Tax Line at 1-800-829-4933.