---
title: Fixing Your Unit Economics Before They Break Your Business | Capstone CFO
description: "How to spot and fix broken unit economics: customer acquisition cost, lifetime value, payback, contribution margin and churn, with practical fixes."
image: https://capstonecfo.com/hubfs/capstone-2026/insights-covers/fixing-your-unit-economics-before-they-break-your-business.png
---

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Insights

# Fixing Your Unit Economics Before They Break Your Business

Capstone CFO

**TL;DR:** unit economics tell you whether each customer or product makes money once you count what it cost to win and serve. Growth with broken unit economics just loses money faster. Track customer acquisition cost (CAC), lifetime value (LTV), CAC payback and contribution margin, and fix the weakest one first, usually pricing, churn or an expensive acquisition channel.

## The core metrics

| Metric | Formula | Rule of thumb |
| --- | --- | --- |
| CAC | Sales and marketing cost ÷ new customers | Track by channel, not just in total |
| LTV | Average annual gross profit per customer × average years retained | Use gross profit, not revenue |
| LTV:CAC | LTV ÷ CAC | About 3:1 is a common target |
| CAC payback | CAC ÷ monthly gross profit per customer | Shorter means less cash tied up in growth |
| Contribution margin | Revenue − variable costs | Must be positive on every sale |

## Five warning signs

1. **CAC keeps rising** while revenue per customer does not.
2. **Contribution margins are thin or negative,** so each sale deepens losses.
3. **Churn is climbing,** shrinking LTV.
4. **Nobody knows the payback period,** so budgets are guesses.
5. **Growth depends on discounts,** hiding true margins.

## Fixes that work

- **Price for value:** raise prices or reduce discounting for segments that can bear it.
- **Cut or rework expensive channels:** move budget to the channels with the best payback.
- **Reduce churn:** better onboarding, customer success and product fixes.
- **Lower cost to serve:** automation, self-service and smarter fulfillment.
- **Focus on profitable segments:** stop chasing customers you cannot serve profitably.

## Frequently asked questions

### Should LTV use revenue or gross profit?

Gross profit. Revenue overstates what a customer is really worth.

### What is a good CAC payback period?

It depends on your model and funding. Bootstrapped companies generally need shorter paybacks than venture-backed ones.

### How often should unit economics be reviewed?

Monthly for the core metrics, with a deeper cohort review each quarter.

*Want your unit economics checked? See [the metrics every CEO should track](https://capstonecfo.com/blog/top-financial-metrics-every-ceo-should-track-for-sustainable-growth) or [book a call with our CFO team](https://capstonecfo.com/meeting).*

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Talk with our CFO team about your goals.

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#### Who We Serve

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