Maryland Code, State Finance and Procurement § 15-105

(1) unless within 30 days after the date on the State's check for the amount on which the interest accrued, the contractor submits an invoice for the interest;

(2) if a contract claim has been filed under Subtitle 2 of this title;

(3) accruing more than 1 year after the 31st day after the unit receives an invoice; or

(4) on an amount that represents unpaid interest.