Business Personal Property Taxes. You need to establish various tax accounts for your business.You can fill out the interactive. Extensions of the filing deadline up to 60 days can be granted if the requests are made on or before April. 15th. Visit SDAT to file an extension. If you do not file this form, you may be fined, or your business could lose its LLC status and liability protection. This formula allocates income to Maryland based on a ratio of the corporation's sales, property, and payroll located in Maryland to its total sales, property. Filing a Failure to Pay Rent Case? This class will help you learn how to fill out the form. Watch. Our guide offers business owners easy-to-follow directions on how to file the Maryland Annual Report and Personal Property Tax Return on your own.