Acquiring 20 clients does not mean you will have 20 clients in ten years. At a typical 8–10% annual attrition rate — the rate most MFDs run without measuring — a 100-client book becomes 40–50 clients in a decade. Half the practice walks out the back door while the front door is still open. And almost no MFD measures this. The book looks healthy on the AUM line because new clients hide the churn. Until growth slows. Then the hollowing becomes visible. And by then it is too late to fix.
Walk into any growing MFD practice. The numbers look the same: AUM up, client count up, trail income up. The advisor reports "healthy growth." The reality underneath the growth is rarely measured: how many clients walked out this year?
Most MFDs cannot answer this question. The CRM, if any, doesn't track exits. The mental model treats every monthly trail receipt as confirmation that the book is intact. It is not. A practice with 200 clients and 12% annual attrition is also a practice that has lost 24 clients this year — the equivalent of three months of new acquisition silently undone.
Because acquisition is visible (new clients, onboarding paperwork, congratulations) and attrition is invisible (clients quietly redeeming, switching to direct, going to a competitor), the entire industry under-counts churn and over-counts growth. This is the Attrition Problem.
Attrition compounds. Each year's losses leave a smaller base for next year. The intuition that "7% per year over 10 years = 70% lost" is wrong. Survivors compound just like wealth: the actual retention is (1−rate)^N.
| Annual Attrition Rate | 5-Year Retention | 10-Year Retention | 20-Year Retention |
|---|---|---|---|
| 3% · "Best in class" | 86% | 74% | 54% |
| 5% · "Strong practice" | 77% | 60% | 36% |
| 7% · "Industry average" | 70% | 48% | 23% |
| 10% · "Concerning" | 59% | 35% | 12% |
| 15% · "Crisis" | 44% | 20% | 4% |
Cohort retention — what fraction of a starting client base remains active. The "industry average" 7% rate halves a cohort in 10 years. The "concerning" 10% rate halves it in 7. Most MFDs are running between 8–12% and don't know it.
Of 100 clients acquired today, only 19 remain after 20 years — the typical span of an MFD career. The other 81 leave for direct plans, competitors, life events, or the unmeasured "we lost touch" category. Acquisition has to refill the bucket faster than this rate of leakage just to maintain the book.
Attrition has identifiable causes — the question is which ones the MFD can address. The unfixable ones (death, relocation, true financial change) are about 30% of churn. The other 70% is preventable with deliberate practice design.
"A book of one hundred clients acquired over a career is not a book of one hundred clients. It is a book of whoever stayed. The MFD who measures growth without measuring loss is doing arithmetic on half the equation. Acquisition is the visible win. Attrition is the silent loss. One looks like progress. The other is invisible. Until the year growth slows. Until the year a buyer audits the book. Until the day the founder retires and the firm-loyal clients stay while the founder-tied clients walk. The MFDs who build durable practices are the ones who stopped optimising for the front door and started watching the back door."