Financial Glossary
Retention
In a business context, retention refers to the ability to keep customers, subscribers, or employees engaged over time rather than losing them to churn or attrition. Customer retention rate = ((customers at end of period - new customers acquired during period) / customers at start of period) x 100. High retention reduces the cost of revenue because serving an existing customer is cheaper than acquiring a new one. In subscription and SaaS businesses, customer retention is directly tied to revenue retention (Net Revenue Retention). In HR contexts, employee retention rate tracks the percentage of staff who remain employed over a defined period.
Problem & Application
A campground membership program starts January with 500 annual members. Over the year, 80 cancel (churn) and 120 new members join. End of year: 540 members. Retention rate = (540 - 120) / 500 = 84%. Churn rate = 16%. At an annual membership fee of $300, 80 churned members represent $24,000 in lost recurring revenue. If reacquisition costs $75 per new member (marketing and promotion), recovering those 80 churned members costs $6,000 -- but you also must replace them with 80 new members at $6,000 cost just to stay flat, whereas retaining them would cost nothing. For SaaS companies, the revenue impact is calculated via Net Revenue Retention: if expanding customers more than offset churned revenue, NRR exceeds 100% -- the business grows revenue purely from its existing customer base without new sales. Improving retention by even 5 percentage points typically compounds into meaningful revenue differences over a three-to-five-year horizon due to the lifetime value effect.
In Short
Retention is a crucial indicator of loyalty, and improving it can lead to lower costs and higher lifetime value for both customers and employees.