---
title: Subscription Unit Economics — RGM Training
url: https://realgrowthmatters.com/training/subscription-growth/subscription-unit-economics/
updated: 2026-06-10
source_html: https://realgrowthmatters.com/training/subscription-growth/subscription-unit-economics/
---

[Home](../../../index.html) › [Training](../../index.html) › [Subscription Growth](../index.html) › Subscription Unit Economics

RGM° · Training

# Subscription Unit Economics

Tiny retention changes compound dramatically. MRR components, churn math, LTV, payback, expansion, cash conversion.

### What you will learn

1. [Why subscription unit economics differ](#why)
2. [MRR and components](#mrr)
3. [Churn math compounds](#churn-math)
4. [LTV for subscriptions](#ltv-sub)
5. [Payback and CAC discipline](#payback)
6. [Expansion economics](#expansion)
7. [Cash conversion for subs](#cash)
8. [Advanced playbook](#advanced)
9. [Common mistakes](#mistakes)
10. [Checklist](#checklist)

## Why sub unit economics differ

Tiny changes in retention compound dramatically. A 90% retained subscription has 10× the customer lifespan of a 50% retained one. Subscription unit economics reward retention obsessively.

## MRR components

- New MRR.
- Expansion MRR.
- Reactivation MRR.
- Contraction MRR.
- Churn MRR.
- Net new MRR = sum.

## Churn math

- 5% monthly churn = 46% retained after 12 months.
- 2% monthly churn = 78% retained after 12 months.
- 10% monthly churn = 28% retained after 12 months.
- The math is unforgiving; even small churn-rate differences produce massive LTV gaps.

## LTV for subscriptions

- LTV = ARPU × gross margin / churn rate (simple).
- Better: sum of expected revenue across cohort with retention curve.
- Discount future revenue for present value.
- Predicted LTV from cohort behavior.

## Payback and CAC discipline

- Subscription payback often 12–24 months.
- Long payback acceptable when retention strong.
- Payback ratio (LTV/CAC) targets 3×+ for healthy.
- Channel-level CAC informs allocation.

## Expansion economics

- Plan-tier upgrades.
- Seat additions.
- Add-on purchases.
- Usage-based fees.
- Expansion is cheaper than acquisition; invest accordingly.

## Cash conversion

- Monthly billing: cash matches revenue.
- Annual prepay: cash front-loaded; capital efficient.
- Discount annual prepay 10–20% typically.
- Long-payback subscriptions need annual prepay or capital reserves.

## Advanced playbook

- Cohort retention curves visible monthly.
- Predictive LTV at subscriber level.
- Channel-level LTV.
- Annual prepay incentive optimization.
- Expansion playbook by segment.
- Plan-tier optimization quarterly.
- Churn prediction with intervention triggers.
- Save offer ROI measurement.
- Reactivation campaign tracking.
- Compliance-aware cancellation that still saves where possible.

## Common mistakes

- Average-based LTV instead of cohort-based.
- Channel-level LTV missing.
- Annual prepay not offered.
- Expansion under-invested.
- Churn math not understood; small changes ignored.
- Predictive churn missing.
- Save offers not measured.
- Cancellation flow generic.
- Reactivation campaigns absent.
- Plan tier stale.

## Operating checklist

- MRR components tracked monthly
- NRR as headline metric
- Cohort retention curves visible
- Channel-level LTV
- Annual prepay incentive
- Expansion playbook
- Predictive churn where supports
- Save offer ROI measured
- Reactivation campaigns
- Plan tier reviewed quarterly

## Sources and further reading

- Patrick Campbell, ProfitWell
- David Skok, For Entrepreneurs
- Christoph Janz, Point Nine
- Daniel McCarthy customer-based valuation
- Andrew Chen LTV writing
- OpenView SaaS benchmarks
- Tomasz Tunguz B2B SaaS
- RGM DTC Growth unit economics
- Frederick Reichheld loyalty research
- Reforge retention curriculum
- Stripe Atlas subscription playbooks
- ProfitWell churn research

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Part of the [Subscription Growth](../index.html) series.