Quick answer

Your overhead rate is your indirect costs divided by a base, usually billable hours or direct labour cost. Spread $120,000 of overhead across 6,000 billable hours and each billable hour carries $20 of overhead. Add that to the cost of the person doing the work and you have the true floor your billing rate must clear.

This guide is written for agency owners, consultants, and small service businesses that want to price work above their true cost rather than guessing a rate who want time tracking to support better planning, billing, reporting, and project decisions.

What counts as overhead

Overhead is every cost of running the business that you cannot tie to a single client project. Rent, software subscriptions, admin salaries, insurance, accounting, marketing, equipment, and the non-billable time of your billable people are all overhead. The test is the same one you use for billable hours, reversed: if no individual client should pay for it directly, it belongs in overhead and has to be recovered across all your chargeable work instead.

The cost that trips people up is the non-billable time of the people who also do billable work. A designer on a $70,000 salary who is billable 65 per cent of the time spends the other 35 per cent on internal work, and that portion of their pay is overhead, not direct cost. Leaving it out is the single most common reason a service business feels busy and still runs thin, because the rate was set to cover only the hours that reached a client and none of the hours that did not.

  • Facilities: rent, utilities, office equipment, insurance
  • Operations: software, accounting, legal, bank and payment fees
  • People overhead: admin and management salaries, plus the non-billable time of billable staff
  • Growth: marketing, sales, proposals, and unconverted pitch work

The formula and how to pick a base

The formula is overhead rate = total overhead ÷ allocation base. The base is whatever you want to spread overhead across, and the two sensible choices for a service business are total billable hours or total direct labour cost. Using billable hours gives you overhead as a dollar figure per billable hour, which is the easiest version to use when you quote by the hour. Using direct labour cost gives you overhead as a percentage of wages, which is useful when your team members earn very different rates.

Pick one base and stay with it, because the number only means something in comparison to itself over time. Calculate it on real figures from a recent full year rather than a hopeful forecast, and recalculate it when your costs or your billable mix change materially. An overhead rate built on last year's rent and this year's optimism is not a floor, it is a wish.

  • Per-hour method: overhead ÷ total billable hours = overhead dollars per billable hour
  • Percentage method: overhead ÷ total direct labour cost = overhead as a percent of wages
  • Use real trailing-year figures, not a forecast you hope to hit
  • Keep the same base year to year so the trend stays readable

A worked example

Take a five-person studio. Annual overhead comes to $120,000: rent, software, an office manager's salary, insurance, marketing, and the non-billable share of everyone's time. The team as a whole delivers 6,000 billable hours in the year. The overhead rate per billable hour is $120,000 ÷ 6,000, which is $20. Every billable hour has to carry $20 of overhead before the business breaks even on that hour.

Now layer in direct cost. A mid-level designer costs the studio roughly $40 an hour in wages and payroll taxes for the hours they actually work. Add the $20 of overhead and the fully loaded cost of a billable hour from that designer is $60. If the studio bills that hour at $90, the gross margin is $30, or about 33 per cent. If it bills at $60, it is working for free. If it discounts to $55 to win the job, it is paying the client to take the work, and nothing on the invoice will tell you that unless you did this calculation first.

Turning overhead into a billing rate

Once you know the fully loaded cost of a billable hour, your minimum defensible rate is that cost divided by one minus your target margin. If a loaded hour costs $60 and you want a 40 per cent gross margin, the rate is $60 ÷ 0.60, which is $100. That is not the rate the market will necessarily bear, but it is the rate below which you are losing money, and knowing it changes every negotiation. You can choose to discount, but you can no longer do it by accident.

The strong claim worth sitting with is this: a service business that has never calculated its overhead rate is almost certainly underpricing somewhere, because the instinct is to price against a competitor or a gut feel for the wage, and both of those ignore the $20 an hour that is silently eating the margin. The number does not have to be precise to the dollar to be useful. Even a rough overhead rate moves you from guessing to reasoning.

Where the calculation falls down

An overhead rate is only as honest as the billable-hours figure underneath it, and that is exactly the figure most businesses track worst. If your people reconstruct their week on Friday from memory, your billable-hours total is inflated, your overhead rate per hour looks lower than it is, and your rates come out too low as a result. The calculation quietly rewards bad time tracking, which is why it has to be rebuilt on captured hours, not remembered ones.

Overhead rate is also the wrong tool for pricing a single flagship project that will dominate your year, or for work you take deliberately at cost to open a door. There, project-level job costing and a clear-eyed decision about why you are taking the work matter more than a blended rate. Use the overhead rate to set your standard pricing and to sanity-check discounts, not to make every strategic call for you.

Where Zeitio fits

Zeitio helps teams connect tracked hours to clients, projects, tasks, reports, approvals, and invoices so time data becomes useful business context instead of another spreadsheet.

Start with simple time entries, review them weekly, and use the data to improve project planning, billing accuracy, and team workload decisions.

Compare Zeitio pricing or create a workspace to try the workflow.

Further reading

FAQs

What is an overhead rate?

An overhead rate is the amount of indirect cost that each unit of chargeable work has to carry. You calculate it by dividing total overhead by a base, usually billable hours or direct labour cost, so you can see what every billable hour must cover before it earns any profit.

How do I calculate my overhead rate?

Add up all your indirect costs for a full year, including rent, software, admin salaries, and the non-billable time of billable staff. Divide that total by your total billable hours to get overhead per billable hour, or by total direct labour cost to get overhead as a percentage of wages.

What should be included in overhead?

Overhead includes every cost you cannot tie to a single client: rent, utilities, software, insurance, accounting, marketing, admin and management salaries, and the non-billable portion of your billable team's pay. If no individual client should fund it, it is overhead.

How does overhead rate affect my pricing?

Overhead sets the floor. Add overhead per hour to the direct wage cost of a billable hour to get its fully loaded cost, then divide by one minus your target margin to find the minimum rate. Pricing below that floor means losing money on the work, even if the invoice looks healthy.

What is a normal overhead rate for a service business?

It varies widely by model and location, so there is no single benchmark worth quoting. What matters is calculating your own on real trailing-year figures and tracking it over time. A rate built on captured billable hours is reliable; one built on remembered hours is usually too low.