Keeping a customer is usually cheaper than winning a new one, and the habits that retain customers are mostly ordinary: a good first experience, fast and honest support, useful messages sent with permission, simple rewards that fit how people buy, and a way to listen and act on feedback. Choose a retention measure, such as the share of customers who buy again within a set time, and improve it one change at a time.
Key takeaways
- Harvard Business Review reports that acquiring a new customer can cost "five to 25 times more" than keeping an existing one, depending on the study and industry, and cites Bain & Company's finding that a 5% rise in retention can raise profits by 25% to 95%. These are older, widely quoted figures; treat them as indicative, not as a forecast for your business.
- In Canada, the Canadian anti-spam law (CASL) asks businesses to obtain consent before sending commercial electronic messages; get advice for your own situation, as other countries have their own rules.
- Measure retention directly, such as repeat purchase rate or active customers after 30, 90 and 365 days.
- Tools like loyalty schemes or digital wallets help only when customers get something they value.
Why does retention matter?
Existing customers already know you, so selling to them again costs less than finding new ones. HBR's article reports the cost gap and the Bain finding on profit above, without naming all the underlying studies, so use them as a reason to look at your own numbers, not as a promise. A simple test: what share of last year's customers bought again, and what did each repeat customer bring in compared with a new one?
Seven tactics
1. Make the first experience easy
The first days decide whether someone returns. Make sign-up short, show the first useful result quickly, and send a clear welcome that explains what to do next. For apps and online stores, test the first-run flow on a phone; see Nine expensive eCommerce mistakes.
2. Answer quickly and honestly
Support is a retention tool. Publish clear delivery, returns and pricing terms, reply to messages promptly, and say plainly when something went wrong and what you are doing about it. AI assistants can handle common questions if they use your real policies and hand off to a person when needed; see AI for eCommerce.
3. Send messages people value, with permission
Email, messaging and notifications can bring customers back when they are useful: order updates, how-to help, relevant offers. In Canada, CASL asks businesses to obtain consent before sending commercial electronic messages, and other countries have their own rules, so record how and when each person agreed and make unsubscribing easy. See Digital marketing in 2026.
4. Reward behaviour customers care about
A loyalty programme, points or a stored balance only works if the reward is worth having and simple to use. A digital wallet or stored value can reduce friction at checkout and encourage a return visit, but it adds responsibilities: security, clear terms for balances, and compliance with payment and financial rules where you operate, so take specialist advice before building one.
5. Personalise carefully
Use what customers have told you or done with you, such as past purchases or stated preferences, to suggest what is relevant. Be open about what you use, collect only what you need and let people change their choices. Do not guess sensitive things about people.
6. Listen, then act
Ask for feedback after key moments, read what comes back, and fix the repeating problems. Tell customers what changed. Replies to reviews show future customers that you listen.
7. Keep improving the product
People stay with things that keep working and keep getting better. Fix bugs, keep pages fast and update what is out of date. For apps, store requirements change each year; see Mobile app development challenges.
How do you measure retention?
| Measure | What it tells you |
|---|---|
| Repeat purchase rate | Share of customers who buy again in a period |
| Active customers after 30, 90, 365 days | Whether people keep using the product |
| Churn | Share who leave in a period |
| Time between purchases | How often people come back |
| Revenue per returning versus new customer | Whether retention is worth the effort |
Pick one or two measures, track them monthly and compare groups of customers who joined in the same month.
A simple 30-day plan
- Calculate your repeat purchase or active-customer rate today.
- Read the last 50 support messages and reviews for repeating problems.
- Fix the top one and write down the change.
- Review your email and notification consent records.
- Re-measure next month.
Our eCommerce solutions page describes how we help build stores and apps that bring customers back.
FAQ
Is retention really cheaper than acquisition?
HBR reports that acquiring a customer can cost five to 25 times more than retaining one, depending on the study and industry. Check your own acquisition and repeat-purchase numbers.
Do I need consent to email customers?
In Canada, CASL asks businesses to obtain consent before sending commercial electronic messages. Other countries have their own rules, so check the law where your customers are.
Is a loyalty programme worth it?
Only if customers value the reward and it is simple to use. Test a small version first and measure repeat purchases.
Should we build a digital wallet?
Only with specialist advice, because stored value brings security and regulatory obligations. Many businesses start with a simpler loyalty feature.
How do we start measuring retention?
Pick repeat purchase rate or active customers after a set time, measure it today and track it monthly.
Sources (2 links)
- Harvard Business Review, "The Value of Keeping the Right Customers": https://hbr.org/2014/10/the-value-of-keeping-the-right-customers
- Government of Canada, "Canada's anti-spam legislation": https://fightspam-combattrelepourriel.ised-isde.canada.ca/site/canada-anti-spam-legislation/en
