The payment due under the original invoice, multiplied by the number of days between the contract payment date and the warrant upon which the payment was actually scheduled, multiplied by the daily interest rate as set by the Commissioner of Administration and Finance.
The department shall add the figures to the invoice submitted by the vendor and shall process the late penalty interest in accordance with the MMARS Policy and Procedures Manual, as amended, under Object Code 698. it is the department's responsibility to assure that the invoice for late penalty interest clears the payment process successfully to facilitate its appearance on the earliest warrant.
815 CMR, § 4.06