---
title: Customer Retention Problem? How to Tell and Where to Start
description: How to tell if your business has a customer retention problem, which of four gaps is biggest, and one list you can build this week to find out.
image: https://images.pexels.com/photos/3933690/pexels-photo-3933690.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940
---

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3. Do You Have a Customer Retention Problem? How to Tell and Where to Start

\- Business Growth

# Do You Have a Customer Retention Problem? How to Tell and Where to Start

How to tell if your business has a customer retention problem, which of four gaps is biggest, and one list you can build this week to find out.

BG

By Brookwood Growth 

Oct 19, 2026 7 min read

![Asian female florist checking inventory in shop with flowers and ribbons on table.](https://images.pexels.com/photos/3933690/pexels-photo-3933690.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940)

You have a customer retention problem if fewer of last year's customers are still buying from you, or the ones who stayed are spending less, and new sales are covering it up. The fastest way to know: take the customers who bought from you twelve months ago, count how many are still buying, and compare what they pay now with what they paid then.

That check is easy to skip, because the top line looks fine. New customers fill the hole that departing ones leave, so revenue holds steady while the base underneath it gets thinner. That is the gap. Find the Gap. Close the Gap. On this blog, five posts each take one piece of the retention question. This page shows which one answers yours, and gives you one way to tell where to start this week.

## Four questions, four different gaps

Retention is not one number. It is four separate questions, and they lead to different fixes.

- **Are customers leaving?** That is a measurement question.
- **What does a loss really cost?** That is a pricing question about churn.
- **How much is the base you keep worth?** That is a question about the revenue you already have.
- **Are the customers who stay making you money?** That is a profit question, and it has two versions: big accounts and long-tenured ones.

## Measure it first: how many are you keeping?

If you do not know your retention rate, start here. [How to measure what you're retaining](https://www.brookwoodgrowth.com/blog/how-to-measure-what-you-re-retaining-and-why-it-matters) gives the formula for customer retention rate, the dollar version (Net Revenue Retention), and a simple weekly dashboard built from data you already have. It answers the question "are customers leaving, and from which group?"

## Price the loss: what one departure really costs

A lost customer costs more than the revenue that stops. You pay again to find and onboard a replacement (depending on the study and the industry, [Harvard Business Review notes](https://hbr.org/2014/10/the-value-of-keeping-the-right-customers) that winning a new customer costs five to 25 times more than keeping an existing one), and you lose what that customer would have added and referred. [The retention trap](https://www.brookwoodgrowth.com/blog/the-retention-trap-why-losing-one-customer-costs-more-than-you-think) adds those costs up line by line and ends with a review of your last five departures. It answers "how much should I be willing to spend to keep a customer?"

## See the base: the revenue you already have

It is easy to watch the pipeline every week and the existing base hardly at all. [The revenue you can't see](https://www.brookwoodgrowth.com/blog/the-retention-trap-why-losing-one-customer-costs-more-than-you-think) explains why the revenue you keep can matter more than anything in the pipeline, and which three numbers show whether that base is growing, leaking or paying back what it cost to win. It answers "if I stopped selling for 90 days, what would happen?"

## Check the big accounts: customers you pay to keep

Not every customer is worth keeping at any price. [Unprofitable customers: the ones you're paying to keep](https://www.brookwoodgrowth.com/blog/customer-paying-lose) covers accounts whose support time, custom work and negotiated discounts eat most of what they pay. They can be among the biggest names on your list, kept because their revenue line looks too large to lose. It answers "which of my customers cost more to serve than they bring in?"

## Check the loyal accounts: when tenure erodes margin

This is a different problem from size. [The loyalty that's actually costing you profit](https://www.brookwoodgrowth.com/blog/loyalty-costing-profit) covers accounts that were profitable once and lost margin one small concession at a time: a discount at one renewal, a custom report the next year, rush work after that. It gives a two-step test, margin by tenure and price realization. It answers "are my longest customers earning me less than my newest ones on the same work?"

## A method for this week: the four-column customer list

You need your customer list from twelve months ago and an hour. The point is not a perfect number. It is to see which of the gaps above is biggest in your business, so you read one post and act on it instead of reading all five.

### Step 1: build the list

Export every customer who paid you anything in the same month last year. Next to each name, add four columns.

- **Column A, then:** what they paid in that month last year.
- **Column B, now:** what they paid in the same month this year. Zero if they have stopped buying.
- **Column C, shrinking:** mark it if B is lower than A but not zero.
- **Column D, hard to serve:** mark it if your team would call the account demanding, heavily discounted or custom. Gut feel is fine for a first pass.

### Step 2: add up three totals

Total last year's monthly dollars for customers who went to zero. Total the drop for customers marked as shrinking. Total the current monthly revenue of customers marked as hard to serve. Compare the same month a year apart, not two different months, or seasonality will look like churn.

*Illustrative example:* a business had 120 customers last March. This March, 14 of them bought nothing, which was $9,800 a month that stopped. Another 22 bought less, a combined drop of $3,100 a month. And 6 accounts the team calls "difficult" pay $11,000 a month between them. These figures are invented to show the method, not drawn from any real business.

### Step 3: let the biggest total pick your next read

- If **lost customers** is the biggest total, price the loss with [the retention trap](https://www.brookwoodgrowth.com/blog/the-retention-trap-why-losing-one-customer-costs-more-than-you-think), then call three of the customers who left.
- If **shrinking customers** is the biggest, measure by cohort with [how to measure what you're retaining](https://www.brookwoodgrowth.com/blog/how-to-measure-what-you-re-retaining-and-why-it-matters) to see which group is fading.
- If **hard-to-serve revenue** is the biggest, check profit before you spend a dollar keeping anyone: [customers you're paying to keep](https://www.brookwoodgrowth.com/blog/customer-paying-lose) for big accounts, [the loyalty test](https://www.brookwoodgrowth.com/blog/loyalty-costing-profit) for long-tenured ones.

The three totals measure different things, so treat the comparison as a rough pointer, not a verdict. In the illustrative example above, the hard-to-serve total is largest, so the first job is a profit check on six accounts, not a retention campaign. If you would rather see how retention compares with the other places money leaks, [Take the 2-Minute Gap Check](https://www.brookwoodgrowth.com/gap-check). It covers customers alongside cash, pricing and follow-up.

## Frequently asked questions

### How do I measure customer retention?

Pick a starting point, such as twelve months ago, and list who was buying then. Count how many are still buying and compare what they spend now with what they spent then. Track both the count and the dollars, because price changes can make one look better while the other gets worse. [How to measure what you're retaining](https://www.brookwoodgrowth.com/blog/how-to-measure-what-you-re-retaining-and-why-it-matters) has the full method.

### How do I calculate customer retention rate?

The formula used in [our measurement guide](https://www.brookwoodgrowth.com/blog/how-to-measure-what-you-re-retaining-and-why-it-matters): customer retention rate is (customers at the end of the period minus new customers added during it) divided by customers at the start, times 100. *Illustrative example:* start with 200, add 30, end with 215, and you kept (215 minus 30) divided by 200, or 92.5%. New customers are left out on purpose, so they cannot hide the ones who left.

### How do I deal with unprofitable customers?

First confirm they are unprofitable: revenue minus the time, custom work and discounts they take. Then work through three options in order: move them to your current standard terms, keep the price but cut the scope, or let the contract end. [The unprofitable customers post](https://www.brookwoodgrowth.com/blog/customer-paying-lose) shows how to find these accounts, and [the loyalty post](https://www.brookwoodgrowth.com/blog/loyalty-costing-profit) walks through those three options.

## The one decision to make this week

Build the four-column list from last year's customers, see which total is biggest, and commit to one of three moves for the next 30 days: win back the customers who left, find out why the shrinking ones are spending less, or check profit on the hard-to-serve accounts before you spend anything to keep them. Pick one. The other two can wait until you know the first one's number.

## More from When numbers don't agree

### [![Financial data dashboard on laptop and phone showing the full cost picture hidden behind a simple revenue loss entry](https://www.brookwoodgrowth.com/hubfs/brookwood/Blog%20Photos/neil-fernandez-_rAKDw1Fd54-unsplash.jpg?w=600) Business Growth The Retention Trap: Why Losing One Customer Costs More Than You Think](https://www.brookwoodgrowth.com/blog/the-retention-trap-why-losing-one-customer-costs-more-than-you-think)

### [![Business leader reviewing customer profitability reports to identify unprofitable accounts](https://www.brookwoodgrowth.com/hubfs/brookwood/Blog%20Photos/adeolu-eletu-E7RLgUjjazc-unsplash.jpg?w=600) Business Growth Unprofitable Customers: The Ones You're Paying to Keep](https://www.brookwoodgrowth.com/blog/customer-paying-lose)

### [![Business documents, notepad, and calculator on a desk representing the financial analysis required before making a hiring decision](https://www.brookwoodgrowth.com/hubfs/brookwood/Blog%20Photos/kelly-sikkema-U20dtBwxHEU-unsplash.jpg?w=600) Business Growth Why Your Next Hire Should Be Defined by This One Number](https://www.brookwoodgrowth.com/blog/why-your-next-hire-should-be-defined-by-this-one-number)

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