Modified Total Direct Costs (MTDC) is the base to which indirect costs rates are applied.  MTDC includes direct salaries and wages, applicable fringe benefits, materials and supplies, services, travel, and up to the first $25,000 of each subaward.  MTDC excludes equipment, capital expenditures, charges for rent, tuition remission, participants support costs and the portion of each subaward in excess of $25,000.