What's a good client retention rate for an accounting firm?

Top-performing accounting firms achieve 90-96% client retention rates (cpajournal.com/2024/01/23/state-of-the-profession-3/), while the industry average ranges from 60-70% for small firms to 75-85% for larger firms. Even a 5% improvement in retention can significantly increase profitability, as acquiring new clients costs significantly more (futurefirm.co/accounting-client-retention-strategies-growing-firms/) than retaining existing ones.