Md. Code, Tax - Property § 7–245

(a) A person’s personal property is not subject to valuation or to property tax if all of the person’s personal property statewide had a total original cost of less than $20,000.

(b) If the person attests to owning a sum total of personal property with an original cost of less than $20,000, the Department may not:

(1) collect personal property information from the person; or

(2) require the person to submit a personal property tax return.