The IRS and the state identifies a business by their Employer Identification Number, also known as an EIN, or your social security. If you are a sole proprietor, you can use your social security number, or you can apply for and use an EIN. I advise my clients to apply and use an EIN even if they are not required to because given the option when filling out business forms, it’s safer to use an EIN than your Social Security number.
The fastest and easiest way to get an EIN is online at The IRS Web Site, or you can call the IRS directly at (800) 829-4933. If you apply for your number online, you will receive it in less than 15 minutes, provided there are no unforeseen issues.