Retention rate is the percentage of an agency's book that renews rather than lapsing or moving elsewhere. It is the mirror image of lapse rate, and the single most consequential number in an independent agency.
How to calculate it
The straightforward form:
Retention rate = policies renewed ÷ policies up for renewal
Measured over a rolling twelve months. But which denominator you use changes the story:
- Policy retention — counts policies. Simple, but treats a $400 auto policy and a $40,000 commercial account identically.
- Premium retention — counts written premium. Reflects revenue reality but can be flattered by rate increases on a shrinking book.
- Client retention — counts households or accounts. The truest measure of relationship health.
Serious agencies track all three, because a book can show 91% policy retention while quietly losing its largest accounts.
What good looks like
Independent P&C agencies typically run between 84% and 92%. Personal lines monoline auto sits at the low end; multi-line commercial accounts with strong relationships sit at the high end.
Why small movements matter so much
Retention compounds. A book retaining 88% of its clients each year loses half of them in about five and a half years; at 93%, losing that same half takes nearly ten. (The arithmetic: 0.88 compounded halves in ~5.4 years, 0.93 in ~9.6.) That difference does not show up in a single quarter — it shows up as the gap between an agency that grows on new business and one that grows on top of a stable base.
The corollary: a five-point retention improvement is usually cheaper to buy than the equivalent new business, because the clients already know you.