Hi @jestes
I believe what you are describing is correct, although I might phrase it slightly differently.
Overhead is a sort of synonym for indirect expenses, and the two terms are often used interchangeably. They both are words used to describe all non-project related expenses, such as utilities, software licenses, office supplies, etc.
When you are establishing your net multiplier and fees you want to factor in what your overhead (or indirect expenses) are. You want to balance your budget by matching your total expenses with your total revenue, plus any profit you want to target. To do so, when establishing your fees you want to be sure you are accounting for all expenses, both direct and indirect!
If you want to learn more I’d check out page 409-417 of the Architect’s Handbook of Professional Practice.
I also think this presentation from AIA Florida does a great job of showing examples and describing how all these financial terms are used!
Hope this helps!
-Darion