Every Maryland corporation must file a corporation income tax return, using Form 500, even if the corporation has no taxable income or is inactive. Step 1: Choose a name for your corporation.The name must have a corporate ending, such as Corp. We offer several ways for you to obtain Maryland tax forms, booklets and instructions. You can also file your Maryland return electronically online. Explore the steps to establish a corporation in Maryland with our informative article. Find the information you need to incorporate your business in Maryland. To start a Maryland S corporation, you'll need to create either a limited liability company (LLC) or a C corporation if you haven't already done so.