A business that sells people's time has two ways to lose money and most firms track neither: hours you pay for and cannot bill, and hours you bill and do not collect at full rate. Everything below hangs off those two.
The two that decide everything
Utilization
Utilization = Billable hours ÷ Available hours
Benchmark: 65–80% for billable staff.
What it tells you. The share of the time you pay for that you can charge for. Below 60% you are carrying bench you cannot afford. Above 85% sustained is not a win — it is a burnout and quality risk with no capacity left to absorb a new client.
Realization
Realization = Fees actually invoiced ÷ Standard value of hours worked
Benchmark: 85–95%.
What it tells you. What survives discounts, write-offs and scope you absorbed rather than argued about. This is the quiet killer of professional services margins, because every point lost here is work you paid for and gave away.
Effective hourly rate
Effective rate = Fees invoiced ÷ Billable hours
Compare against your rate card. The gap between them is the story.
Profitability
Gross margin = (Fees invoiced − Delivery payroll) ÷ Fees invoiced
Benchmark: 45–60%.
Payroll % = Total payroll ÷ Fees invoiced
Benchmark: 55–70%. In a firm that sells time, this ratio is close to the whole business model.
Operating margin = Operating profit ÷ Fees invoiced
Benchmark: 15–25%.
What a bad number means. Persistently thin operating margins in a services firm are almost always a pricing problem rather than a cost problem. Firms reach for overhead cuts because they are easier, and it rarely moves the number more than a point or two.
Revenue per billable FTE = Fees invoiced ÷ Billable headcount
Track alongside revenue per total FTE. The two diverging means overhead is growing faster than delivery.
Cash: where services firms actually die
A services firm can be profitable on paper for a year and still fail, because profit is recognized when work is invoiced and salaries are paid every two weeks regardless. The gap between those two facts is called lockup, and it is the least tracked number in the industry.
DSO = (Accounts receivable ÷ Fees invoiced) × 30
Benchmark: under 45 days.
WIP days = (Unbilled work in progress ÷ Fees invoiced) × 30
Benchmark: under 30 days.
Lockup = WIP days + Debtor days
Benchmark: under 75 days. This is the full cycle from doing the work to holding the cash.
Collection rate = Cash collected ÷ Fees invoiced
Benchmark: 95%+. Invoiced is not paid.
| Metric | Healthy range | What a bad number usually means |
|---|---|---|
| Utilization | 65–80% | Too much bench, or not enough sold work |
| Realization | 85–95% | Scope creep, over-servicing, or weak change control |
| Gross margin | 45–60% | Delivery is priced below what it costs to staff |
| Payroll % of fees | 55–70% | Overstaffed for the work, or underpriced for the staff |
| Operating margin | 15–25% | A pricing problem wearing a cost-problem disguise |
| Debtor days | Under 45 | Weak invoicing discipline or terms that favour the client |
| Total lockup | Under 75 | You are financing your clients out of your own cash |
Frequently asked questions
What is a good utilization rate?
65–80% for billable staff is the usual healthy band. Below 60% you are paying for capacity you are not selling. Above 85% sustained leaves no slack for a new client, holiday or illness, and quality starts to slip before anyone reports it.
What is the difference between utilization and realization?
Utilization is how much of the time you pay for gets billed. Realization is how much of what you billed you actually charge at full rate. You can be fully utilized and still lose money if realization is poor, which is the most common way a busy firm stays unprofitable.
What is lockup and why does it matter?
Lockup is unbilled work in progress plus unpaid invoices, expressed in days. It is the full gap between doing the work and holding the cash. It is the single largest cash drain in professional services and the least tracked, because neither half appears as a problem on the profit and loss statement.
How do I improve my agency profit margin?
In order of effect: raise realization by controlling scope, raise prices, then improve utilization. Overhead cuts come last because they rarely move the number more than a point or two, and they are usually where firms start.
What is a good operating margin for an agency?
15–25% is the band most healthy firms land in. Consistently below 10% is almost always a pricing problem rather than a spending problem.
How often should I review these?
Utilization weekly — it is the earliest warning you get. Realization, margin and lockup monthly, once the month has closed.