Maryland Code, Local Government § 19-602

(a)(1) A county may borrow money and incur indebtedness through the issuance and sale of notes in anticipation of the receipt of any of the county's State share.

(2) The amount borrowed may not exceed at any one time the county's State share.

(3) In calculating the maximum principal amount of notes that may be outstanding, the State share may not be reduced with respect to any outstanding notes except on receipt by the county of money advanced by the State with respect to the State share and payment of notes with the money.