The Personal Property Division information page of the SDAT Web site contains links to forms and instructions, brochures, exemptions, tax rate charts and more. Copy C of the Form MW506NRS provides specific instructions for reporting the tax withheld on the individual and business tax returns.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. The first section of the form asks: Whether business is conducted in Maryland; The nature of the business; When business began. All corporations, limited liability companies (LLCs), limited liability partnerships (LLPs), and limited partnerships must file personal property returns. It prepares the local property tax returns. Personal property tax is an annual tax on business-owned personal property. Towson, Maryland 21204-4665. For more information on Personal Property Tax Clearance Certificates, call 410-887-2411.