Md. Code, Land Use § 18–504

The Commission is not liable for the payment of interest under this subtitle:

(1) if a proper invoice for accrued interest is not submitted within 30 days after the payment date of the amount on which the interest accrued;

(2) for more than 1 year and 31 days after the receipt date;

(3) on amounts representing unpaid interest; or

(4) if the Commission determines there is a dispute regarding any material factor in the contract or purchase order.