What is needed to register with SDAT? Article of the Annotated Code of Maryland, to do intrastate, interstate and foreign business as a foreign Corporation in the State of.If you need to register your LLC or corporation as a foreign business, you'll need to file an application with the SDAT. Free guide for the simplest way to register your Foreign Corporation in Maryland and obtain a Maryland Certificate of Authority. Or hire us to file for you! Download a free Maryland LLC Operating Agreement. List LLC Members, how profits are split, and how your LLC is taxed. The Comptroller of Maryland is dedicated to helping businesses navigate and fulfill their tax and filing obligations. To be eligible for contract awards and payments, register in the System for Award Management (SAM) and complete your SBA Profile, accessible there as well. An Operating Agreement in Maryland outlines the ownership and operating procedures of your LLC.