A cross-sell is selling an existing customer an additional, complementary product or service alongside what they already buy. It increases revenue per account and deepens the relationship, making the customer harder to replace and raising switching costs.

Every additional service a client buys makes them meaningfully harder to lose. A single-service client can switch on a whim. A client relying on you across three connected functions has switching costs that a competitor cannot easily overcome. Cross-selling is a retention strategy that happens to also increase revenue.

Example:

A client on one engagement adds a second, connected service. Revenue rises and, more importantly, replacing you now means unpicking two dependencies instead of one.

How does cross-selling improve retention?

Each additional service increases switching costs. A customer dependent on you across several functions is far harder for a competitor to displace.

What makes a cross-sell work?

Genuine complementarity. The additional service must solve a real, connected problem, not simply add revenue to the account.