Technically they want to limit indirect costs to 15%. This currently ranges from 50%-100%. Indirect costs have two components, facilities and administration.
Facilites are the cost of buildings, electricity, janitorial service, etc. Think of this as things that might be included in the rent if you were renting a place to do the research.
Administration costs are mostly salaries for people, administrative and clerical staff. Not the people directly doing the research (that's a direct cost), but the people in charge of safety/compliance/legal, etc.
Administrative costs have been capped at 25% for a few decades. Facilities costs are not capped.
Facilites are the cost of buildings, electricity, janitorial service, etc. Think of this as things that might be included in the rent if you were renting a place to do the research.
Administration costs are mostly salaries for people, administrative and clerical staff. Not the people directly doing the research (that's a direct cost), but the people in charge of safety/compliance/legal, etc.
Administrative costs have been capped at 25% for a few decades. Facilities costs are not capped.