Client churn isn't evenly distributed across pricing models or agency sizes — and the biggest single driver of it isn't pricing at all, it's whether the client feels the results matched what they were promised.
| Model | Monthly churn | Annualized |
|---|---|---|
| Retainer-based | 1.6% | ~18% |
| Hybrid model | 2.5% | ~28% |
| Performance-based | 3.1% | ~33% |
| Project-based | 4.2% | ~42% |
See our pricing models guide for how each of these structures works — the churn gap here is one more real factor to weigh alongside cash flow and risk when picking a model, since retainer's predictability advantage extends to client retention as well.
Agency size correlates with churn too: smaller agencies (1-10 employees) see roughly 32% annual churn, dropping to 24% at 11-25 employees, 19% at 26-50, and 15% at 51+ — larger agencies tend to have more mature onboarding, reporting, and account management systems, which is likely doing more of that work than size itself.
Retainer clients stay with an agency for roughly 56 months on average — a genuinely long relationship once it's established. Project-based clients stay closer to 24 months. That gap is a strong argument for retainer's structural advantage in building a durable client base, independent of the pricing-model trade-offs covered in our pricing guide.
Unmet performance expectations rate as the highest-impact churn driver across every agency type studied. More specifically: delivery dissatisfaction is cited by 48% of departing clients as their top reason for leaving — not price, not a competitor's pitch, but a felt gap between what was promised and what was delivered.
This is why honest reporting matters for retention, not just transparency. A client who understands why a slow month happened and what's being done about it experiences a different "unmet expectation" than one who's surprised by a bad quarter they were never warned about. See our client reporting guide for how to report a weak month without eroding trust.
A meaningful and fairly recent churn driver: roughly 60% of senior marketing leaders report reducing agency spend specifically because of AI tooling that lets them bring work in-house. This doesn't always show up as a formal contract termination — it often shows up as quiet budget reduction or scope-narrowing rather than an outright churn event, which makes it easy to miss until revenue has already declined.
It varies quite a bit by pricing model: roughly 1.6% monthly (about 18% annually) for retainer-based agencies, up to 4.2% monthly (about 42% annually) for project-based agencies, with hybrid and performance models in between.
Unmet performance expectations, specifically delivery dissatisfaction — cited by 48% of departing clients as their top reason for leaving, ahead of price or competitor pitches.
Retainer clients stay roughly 56 months on average, meaningfully longer than project-based clients at around 24 months — one of the clearest structural advantages of retainer pricing beyond cash-flow predictability.
It's a growing factor — roughly 60% of senior marketing leaders report reducing agency spend due to AI tooling that lets them bring work in-house, often as quiet budget reduction rather than an explicit cancellation.
Related guides
Written by
Scott Holmes
AI systems consultant based in Barrie, Ontario. Founder of Pinnacle Tech Projects. Has managed client retention across retainer-based cold email engagements.
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