The Client Nobody Admits Is Now a Cost Center
Every agency has a version of this relationship: a client that was a genuinely good fit once, has since drifted past the point of real strategic or financial sense, and keeps getting renewed anyway, because ending it feels like a bigger decision than it should be. Nobody frames it internally as “we are losing money on this account.” It just keeps going, quarter after quarter, on the strength of habit more than analysis.
Why Most Agencies Cannot See This Happening
Only 20% of agencies track profitability by client, project, or service line, per TMetric’s 2025 research. That is not a minor gap. It means the large majority of agencies are making renewal and staffing decisions about specific clients without the one number that would tell them whether a given account is still a good deal, running on a blended, agency-wide sense of health instead of the account-level reality.
A client past its natural end is, almost by definition, invisible under that kind of blended view. The account can look fine at the top-line agency level for a long time while quietly running well below a healthy margin underneath, precisely because nobody is looking at it closely enough, by itself, to notice.
The Margin Math: Healthy vs. the Danger Zone
Per LoomDeck’s 2026 compilation of Parakeeto and TMetric benchmark data, a healthy P&L level gross margin runs 50% to 60%, with 70% or higher as the target on individual projects and retainers. TMetric’s separate 2025 dataset flags gross margin under 40% as a danger threshold. A client kept past its natural end tends to drift toward that danger zone rather than the healthy range, as scope quietly expands, discounts accumulate, or the account simply requires more senior time than its retainer was ever priced to support.
Without per-client tracking, that drift is exactly the kind of slow, gradual change that never triggers an obvious alarm. Nothing about the relationship looks dramatically different month to month. The margin has just been eroding underneath a number nobody is watching at the account level.
The Utilization Cost Hiding Alongside the Margin Cost
Margin is not the only thing this client is quietly consuming. Parakeeto’s data puts typical net annual utilization for a full team at 50% to 60%, against TMetric’s 65% to 80%, or 70% to 75%, “sweet spot” for billable utilization. Every hour spent servicing a client that both sides privately know should have ended already is an hour that is not going toward a better-fit account, or toward the new-business work that would replace it with something healthier.
That is the harder cost to see in a spreadsheet, since it never shows up as a negative number, it shows up as capacity that is simply unavailable for something better, quarter after quarter.
The Harder Edged Cost: What It Does to the Agency’s Own Value
There is a sharper version of this cost than margin or utilization alone. The same client concentration thresholds Projectworks uses to flag one large, at risk client as a red flag to a buyer, treated as professional consensus rather than a single peer reviewed figure since sources disagree on the exact cutoff, apply just as directly to a client kept well past its natural end for the wrong reasons. A client an agency is quietly relieved to still have on the books because it fills a revenue gap is, from a buyer’s perspective, exactly the kind of dependency that compresses a sale multiple, not evidence of a healthy, diversified business.
An agency that has never priced its own future sale into a renewal decision is missing half of what this specific client relationship is costing, the ongoing margin drag today, and a real discount on what the business itself would be worth tomorrow.
What Finally Triggers the Decision
The agencies that act on this, rather than letting it run indefinitely, tend to be the ones that put a real number on it first, comparing this specific account’s margin and utilization draw against the agency’s own healthy benchmarks, rather than relying on a general sense that the relationship has gotten harder than it used to be. Once the cost is written down instead of just felt, the decision that follows usually looks less dramatic than the delay leading up to it suggested it would be.
Sources
The external data in this article draws on the sources below. Figures described in the text as estimates or industry triangulations are directional and are not attributed to a single dataset.
- TMetric, 2025 marketing agency profitability benchmarks
- LoomDeck, Agency Profitability Benchmarks 2026 (compiling Parakeeto and TMetric data)
- Projectworks, Client Concentration Risk: What It Is, Why It Tanks Your Valuation and How to Fix It