What Is an Overhead Rate?
Your overhead rate is the portion of your fixed monthly costs that must be recovered from each billable hour you sell. It’s the answer to the question: “Before I make a single dollar of profit, how much do I need to charge per hour just to keep the lights on?”
Overhead Rate = Monthly Overhead ÷ Monthly Billable Hours
If your agency spends $8,000/month on rent, software, non-billable staff, and utilities, and your team delivers 200 billable hours that month, your overhead rate is $40/hr. That means the first $40 of every billable hour goes to covering overhead — only revenue above that contributes to paying your billable team and generating profit.
Most agencies that struggle with margin have never calculated this number. They set billing rates based on what competitors charge or what feels right — without knowing whether those rates actually cover their cost structure.
What Counts as Overhead?
Overhead is any cost your business incurs regardless of how much client work you deliver. It divides into three categories:
Fixed Facility Costs
- Office rent or co-working memberships
- Utilities and internet
- Office equipment depreciation
Software & Tools
- Project management software (Asana, Monday, ClickUp)
- Design tools (Adobe CC, Figma)
- Accounting and invoicing software
- CRM and sales tools
- Communication tools (Slack, Zoom, G Suite)
- Any subscription that supports delivery but isn’t billed to a specific client
Non-Billable Staff
- Operations and admin roles not billed to clients
- Business development and sales time
- Finance and HR functions
- Owner/principal time spent on internal work
Note: the time your billable team spends on non-billable tasks (meetings, admin, proposal writing) is captured separately as a utilization issue — it shows up in a lower billable hour count, not in the overhead bucket.
How to Use Your Overhead Rate
Once you know your overhead rate, you can use it to set minimum billing rates and evaluate project profitability with real numbers.
Setting a minimum billing rate
Your minimum billing rate is the rate at which you break even before accounting for labor. Add your overhead rate to your fully-loaded labor cost per hour to find the floor:
Minimum Rate = Overhead Rate + Labor Cost per Hour + Target Margin
Example: If your overhead rate is $40/hr, a senior designer costs $55/hr fully loaded, and you want a 30% margin, your minimum billing rate is: ($40 + $55) ÷ (1 − 0.30) = $135.71/hr. Charging below that means you’re subsidizing the client from your own pocket.
What the overhead burden % tells you
The overhead burden percentage shows overhead as a proportion of your total billing capacity. If your overhead burden is 35%, overhead consumes 35 cents of every dollar you bill before paying anyone. A healthy agency typically targets an overhead burden below 25–30% — higher than that, and overhead growth is outpacing billable capacity.
Reducing your overhead rate
There are only two levers: reduce monthly overhead, or increase monthly billable hours. Usually, increasing billable capacity is more sustainable than cutting costs — an extra 20 hours of utilization per month can drop the overhead rate significantly without affecting delivery quality.
For a complete picture of project-level profitability, use the project profitability calculator alongside this tool — it factors in overhead allocation, labor, and direct costs together.
Overhead Rate in the Context of Agency Profitability
Overhead rate is one of four profitability levers agency owners control: pricing, utilization, overhead, and scope management. Most agencies focus on pricing (raising rates) and ignore overhead — but reducing overhead by $500/month at 200 billable hours has the same margin impact as raising rates by $2.50/hr.
The full profitability picture requires connecting overhead to project-level data: which clients are absorbing more overhead than their billing justifies, which team members are running low utilization (increasing per-hour overhead burden), and whether your overhead structure scales proportionally as you add clients.
For the complete framework: The Guide to Running a Profitable Agency covers overhead, pricing, utilization, and project-level margin tracking end-to-end.