By signing the filled-out form, you: 1. Utilize this page's links for helpful tax forms and other tax related information.Every Maryland corporation must file a corporation income tax return, using Form 500, even if the corporation has no taxable income or is inactive. Request for Closure of Business Accounts. Use Withholding Tax Web File to file your quarterly return. The Wage Tax must be filed quarterly and paid on a schedule that corresponds with how much money is withheld from employees' paychecks.