Where can I get federal and state tax identification numbers?
Sole proprietorships without employees can use the proprietor's social security number as a business identification number. It may, however, be advantageous for a sole proprietorship to have an Employer Identification Number (EIN) number.
Partnerships and corporations with or without employees, and sole proprietors with employees, must obtain an Employer Identification Number (EIN) (Form SS-4) from the IRS. The form can be obtained from the IRS at www.irs.gov or 800-392-6089.
Partnerships and corporations with or without employees, and sole proprietors with employees, must register their business with the Department of Revenue. This can only be done online by going to www.mass.gov and registering as a new business. Further information can be obtained at Massachusetts Department of Revenue's website at www.mass.gov/dor.