What is overhead calculation?
Overhead calculation is how an agency finds out what it costs to open the doors before anyone does a billable hour of work. Overhead is every cost that is not directly attributable to a specific project: rent and utilities, software subscriptions, equipment, insurance, accounting and legal fees, recruitment, training, marketing, and the salaries of the people whose time is not billed to clients, from the managing director to the receptionist. Direct costs, by contrast, are the hours and expenses that belong to a particular job: the editor's day on the cut, the crew, the location, the music license.
The calculation adds the indirect costs up for a period, usually a year, and divides them by something meaningful, most often total billable hours or direct labor cost, to produce an overhead rate. That rate is the surcharge every billable hour has to carry so that the business covers its running costs before it makes a profit.
Why it matters
Why overhead calculation matters
An agency that does not know its overhead does not know its prices. Day rates set by looking at what competitors charge, or by what feels right, can be below the true cost of delivering an hour of work, and the agency will discover this at year end when the work was plentiful and the bank balance is not. Overhead calculation turns pricing from guesswork into arithmetic: this is what an hour costs us, this is the margin we need, this is the rate.
It also drives decisions beyond pricing. Knowing the overhead rate shows what a new hire, a bigger office or an expensive piece of software does to the cost of every hour sold, and it reveals when a business has grown its fixed costs faster than its billable capacity, which is the most common way agencies quietly become unprofitable while looking busy.
In practice
How overhead calculation works in practice
- 01
The process begins with a clean split of the ledger into direct and indirect costs. Direct costs attach to projects: billable staff time (at least the portion that is billable), freelancers, production expenses. Everything else is overhead. Some costs are mixed, such as a producer who is billable on some jobs and running the studio on others, and those are split by the proportion of time tracked to each.
- 02
The indirect total is then divided by a base. The most useful base for an agency is billable hours: if overhead is $600,000 a year and the team bills 6,000 hours, overhead adds $100 to the cost of every billable hour. An alternative base is direct labor cost, which produces an overhead percentage; if overhead is $600,000 and direct labor is $800,000, the rate is 75 percent, so an hour that costs $80 in salary carries $60 of overhead. Either way, the loaded cost of an hour is salary plus overhead, and the price is that figure plus the target margin.
- 03
The calculation only works with honest utilization numbers. If the team is expected to bill 6,000 hours and bills 4,500, the overhead per hour rises by a third and the rate card is wrong. Agencies therefore revisit the calculation at least annually, and whenever headcount, rent or utilization moves significantly, and they use time tracking to know what utilization really is.
- 04
The result has to reach the people writing quotes. The loaded hourly cost goes into the estimate template so every quote carries it automatically. At the close of each job, a profitability report compares actual hours and costs with the loaded rate and the fee, which is how the agency learns which kinds of work pay. The rate is dated and kept in one place, so an underperforming job can be checked against the overhead its estimate actually used.
Watch out
What people get wrong about overhead calculation
Leaving people out of overhead. The managing director, the new business lead, the finance manager and the unbilled portion of everyone else's time are overhead, and an agency that counts only rent and software will set rates that cannot pay its own leadership. The second mistake is using an optimistic billable hours figure, which makes the overhead rate look lower than it is and the business look more profitable than it will be. The third is calculating once and filing it. Costs rise, teams change and utilization drifts, and the rate card built on last year's overhead is slowly becoming a discount.
