Agency financial management: staffing rate and project margin

Quick answer. An agency sells time: its profitability rests on three levers, the staffing rate (billable hours over available hours), the project margin (revenue minus directly allocated costs) and the day rate actually collected. None of these indicators has a legal threshold; they are management conventions to set, then monitor each month.

A communications agency, a digital studio or a consulting firm stock nothing and resell nothing. They turn employee hours into revenue. That makes their management simple in principle but deceptive in practice: a full order book can mask weak profitability, and an attractive headline day rate can shrink once unbilled hours are deducted.

In the agency files we support, the most frequent sticking point is not revenue, it is the lack of a clear link between time spent and time billed. This article sets out the indicators that matter, their formulas, their traps, and how to track them without building a monitoring monster.

In an intellectual-services business, the main cost is not a raw material but productive payroll. The central question becomes: how many paid hours turn into billed hours, and at what price?

Three families of indicators structure this management.

1. The staffing rate (or utilisation rate) measures the use of available time: how much of the hour bought from a team member is resold to a client.
2. The project margin measures what each engagement earns once its direct costs are deducted.
3. The average day rate actually collected measures the price per day, after discounts, overruns and unbilled days.

None of these figures is a regulatory standard. There is no official staffing rate or legal project margin: they are management conventions. The only regulated input in the calculation is working time. The legal duration for a full-time employee is 35 hours per week (article L3121-27 of the Labour Code), and a manager on an annual day-based arrangement is capped at 218 days per year, including the solidarity day (article L3121-58 and following of the Labour Code).

The staffing rate compares billable hours (or days) to available hours (or days). Its most common management formula:

Staffing rate = hours billed to clients / available production hours.

The denominator is not the number of paid hours. You start from the days actually workable. For a manager on a day-based arrangement, you start from 218 days, from which you deduct leave, public holidays, training, pre-sales and bench time. For an employee on 35 hours, the annual reference base is 1,607 hours, and statutory paid leave is 2.5 working days per month worked, that is 30 working days per year (article L3141-3 of the Labour Code).

This restatement gives the volume of genuinely productive hours, often, depending on the activity, in an order of magnitude of 1,100 to 1,400 billable hours per year. Note: this figure is an adjustable management assumption, never a standard. It depends on the trade, the pre-sales ratio and administrative time.

Worked example: the leverage of one staffing point#

A digital studio director recently approached us because his revenue was growing but his cash was flat. Reconstructing the time tracking made it clear: his six consultants ran at a moderate staffing rate, with many hours spent on lost proposals and on internal tasks that were never rebilled. Each staffing point recovered, at constant headcount and day rate, translated directly into additional revenue with no extra variable cost. That is the whole point: in an agency, profitability often turns more on the utilisation rate than on the selling price.

Our reading. Track the staffing rate team member by team member, not as a global average: it reveals imbalances. An understaffed senior costs more than a fully staffed junior. The average always lies.

The second indicator drops down to engagement level. The project margin is calculated as follows:

Project margin = project revenue - directly allocated costs (time spent valued at cost, subcontracting, rebilled purchases, travel).

The classic trap is to value time spent at the selling day rate, which artificially inflates the margin. For management purposes, value time at the full hourly cost of the team member (loaded salary plus employer contributions plus a share of overhead), not at its selling price. The gap between the two measures the real value created by the engagement. To go further on the mechanics, see our cost price calculation method and how to distinguish gross margin and net contribution.

A project margin should be tracked continuously, not at year-end. A fixed-price project that overruns on time can flip into negative margin without any revenue falling: revenue is locked, but cost swells.

The day rate sold in a proposal is rarely the one that reaches the bank account. Between commercial discounts, goodwill days, overruns absorbed on a fixed price and days spent but unbilled, the day rate actually collected is often lower. The right management reflex is to calculate the day rate after the fact: revenue billed divided by the number of days actually billed over the period. It is this figure, not the catalogue rate, that should feed the forecast.

Trade-off. Raise the day rate or raise staffing? The price lever affects all new contracts but runs into the market; the staffing lever acts immediately on the existing base but hits human capacity. In general, a degraded staffing rate recovers faster than a price is renegotiated.

An agency bills by milestones, sometimes at the end of a long project. The trade receivables item then becomes the first cash lever. Yet payment delays between professionals are framed: in the absence of a contractual clause, the delay is 30 days after the service is performed, and the contractual delay cannot exceed 60 days from invoice issue, or 45 days end of month by option (articles L441-10 to L441-16 of the Commercial Code, a public-order regime).

These rules set the boundary of what you can negotiate. Beyond it, late-payment penalties apply automatically from the day after the due date, at the rate stated in your general terms of sale (usually the ECB key rate plus 10 points, that is 12.15% in the first half of 2026), with a floor of three times the legal interest rate, plus a fixed indemnity of 40 euros per invoice. Beyond 30 June 2026, this rate must be verified as it is revised each half-year.

Billing quickly, with close milestones and an upfront deposit, weighs more on cash than a deferred margin increase. A structured four-level client follow-up procedure limits DSO drift.

The underestimated risk. The gap between billed production and collected cash. An agency can show a decent margin and run short of cash because unbilled work in progress and receivables pile up. Tracking work in progress matters as much as tracking margin.

Setting up usable management does not require a complex tool, but a discipline of time entry. Here is the sequence we recommend.

1. Set up reliable time tracking, per team member and per project, even rough. Without time data, no staffing or project-margin indicator is calculable.
2. Define the productive hours base by profile (from 1,607 hours or 218 days, restated for leave, holidays and non-productive time).
3. Calculate the full hourly cost of each profile to value time spent at cost, not at the selling price.
4. Track the staffing rate weekly per team member, not just as an average.
5. Check the margin at each milestone of fixed-price projects, to react before the overrun.
6. Manage DSO and work in progress monthly, with paced reminders.

A billing and tracking tool such as Pennylane to track invoicing, combined with time tracking, is enough to feed these indicators. For finer reporting, see our reporting tools for management.

• Is time tracking up to date each week, per project?
• Do you know each team member's staffing rate, not just the average?
• Is the full hourly cost recalculated at least once a year?
• Is the margin checked at each milestone of fixed prices, not only at the end?
• Do you track the day rate actually collected, separate from the catalogue rate?
• Is unbilled work in progress quantified each month?
• Is DSO measured and compared to the contractual delay?
• Do your terms of sale state payment conditions and penalties?

Two deadlines deserve agencies' attention this year. First, the electronic invoicing reform: receiving electronic invoices becomes mandatory for all taxable businesses on 1 September 2026, with issuance following for large companies and mid-caps on the same date, then for SMEs and micro-businesses on 1 September 2027. A B2B agency must be ready to receive, hence to choose its platform.

Second, the late-payment penalty rate changes each half-year: the 12.15% value applies to the first half of 2026 and will need updating afterwards. To frame these indicators in a broader view, our articles on the 5 management KPIs to track in an SME and the fundamentals of financial management complement this sector approach. An outsourced CFO to structure your management can industrialise this dashboard.