DOR has released its 2024 Massachusetts Corporate Excise tax forms. You will also find prior year forms and estimated tax payment vouchers.Downloaded forms must be printed, completed, signed with an original signature. To create a Massachusetts S corporation, you'll need to create either a limited liability company (LLC) or a C corporation if you haven't already done so. All business corporations organized under the laws of the Commonwealth, except those dissolved prior to July 1, 2004, file on the forms provided below. To start a corporation in Massachusetts, you must file Articles of Organization with the Corporations Division. File the Massachusetts Certificate of Organization; Create an Operating Agreement; File Form 2553 to Elect Massachusetts S Corp Tax Designation. You must register your corporation with the state, prepare internal corporate documents, appoint company directors, and issue stock.