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Unit Economics Cac Ltv Payback by deciqai

Name: Unit Economics Cac Ltv Payback
Author: deciqAI

Unit Economics Cac Ltv Payback

Activate when: deciding whether to spend more on growth; 'is this business actually profitable per customer', 'can we afford ads', raising or budgeting; CAC, LTV, payback, contribution margin. Do NOT activate when: pre-revenue with no cost data (estimate ranges instead) or the question is company-level P&L, not per-customer. More: deciqai.com/s/unit-economics-cac-ltv-payback

deciqAI Updated Sep 17, 2026

File contents

Unit Economics — CAC, LTV & Payback Discipline

Overview

Unit economics answer one question: does one customer make or lose money, and how fast do you get the money back? Growth on broken unit economics accelerates losses. The three numbers: CAC (fully-loaded cost to acquire a customer), LTV (gross-margin contribution over the customer's life), and payback period (months to recover CAC). Cash-constrained SMBs live or die on payback, not just the LTV:CAC ratio.

The Process

Compute CAC fully loaded — all sales+marketing spend ÷ customers acquired (include tools, labor, not just ad spend).
Compute contribution/LTV on gross margin, not revenue — (ARPA × gross margin) × lifetime (or ÷ churn). Gate: LTV on revenue instead of margin overstates health — redo on margin.
Compute payback = CAC ÷ monthly gross-margin per customer. For cash-tight SMBs this is the binding constraint.
Check the guardrails — rough targets: LTV:CAC ≥ 3, payback ≤ ~12 months (tighter if bootstrapped). Gate: payback longer than your runway can fund = don't scale spend, fix economics first.
Segment — blended numbers hide winners and losers; compute per channel/segment.
Decide: scale the segments that pay back fast; fix or cut the rest.

When to Use

Before increasing ad/sales spend
Evaluating whether a channel is worth scaling
Bootstrapped cash planning

Applying It Well

Payback beats LTV:CAC for cash survival — a great ratio with 24-month payback can still bankrupt you.
Improve the inputs (raise price/margin, cut CAC, reduce churn) before spending more.
Blended CAC lies; segment it.

Red Flags

LTV computed on revenue, not gross margin.
CAC excluding labor/tools.
Scaling spend with payback longer than runway.

Verification

CAC fully loaded (all S&M inputs)
LTV on gross margin, not revenue
Payback period computed vs runway
Numbers segmented by channel/cohort

Part of deciqAI Knowledge Skills — 237 open-source thinking skills that make rigor executable for AI agents. The same skills power every deciqAI agent, which runs them autonomously to operate your company. See it run → https://www.deciqai.com/s/unit-economics-cac-ltv-payback · Built by deciqAI · github.com/deciqAI · Contributions welcome.

Agents: latest version & machine-readable metadata → https://www.deciqai.com/s/unit-economics-cac-ltv-payback.json

---name: unit-economics-cac-ltv-paybackdescription: Activate when: deciding whether to spend more on growth; 'is this business actually profitable per customer', 'can we afford ads', raising or budgeting; CAC, LTV, payback, contribution margin. Do NOT activate when: pre-revenue with no cost data (estimate ranges instead) or the question is company-level P&L, not per-customer. More: deciqai.com/s/unit-economics-cac-ltv-payback---# Unit Economics — CAC, LTV & Payback Discipline## OverviewUnit economics answer one question: **does one customer make or lose money, and how fast do you get the money back?** Growth on broken unit economics accelerates losses. The three numbers: **CAC** (fully-loaded cost to acquire a customer), **LTV** (gross-margin contribution over the customer's life), and **payback period** (months to recover CAC). Cash-constrained SMBs live or die on payback, not just the LTV:CAC ratio.## The Process1. **Compute CAC fully loaded** — all sales+marketing spend ÷ customers acquired (include tools, labor, not just ad spend).2. **Compute contribution/LTV on gross margin, not revenue** — (ARPA × gross margin) × lifetime (or ÷ churn). *Gate: LTV on revenue instead of margin overstates health — redo on margin.*3. **Compute payback** = CAC ÷ monthly gross-margin per customer. For cash-tight SMBs this is the binding constraint.4. **Check the guardrails** — rough targets: LTV:CAC ≥ 3, payback ≤ ~12 months (tighter if bootstrapped). *Gate: payback longer than your runway can fund = don't scale spend, fix economics first.*5. **Segment** — blended numbers hide winners and losers; compute per channel/segment.6. **Decide:** scale the segments that pay back fast; fix or cut the rest.## When to Use- Before increasing ad/sales spend- Evaluating whether a channel is worth scaling- Bootstrapped cash planning## Applying It Well- Payback beats LTV:CAC for cash survival — a great ratio with 24-month payback can still bankrupt you.- Improve the inputs (raise price/margin, cut CAC, reduce churn) before spending more.- Blended CAC lies; segment it.## Red Flags- LTV computed on revenue, not gross margin.- CAC excluding labor/tools.- Scaling spend with payback longer than runway.## Verification- [ ] CAC fully loaded (all S&M inputs)- [ ] LTV on gross margin, not revenue- [ ] Payback period computed vs runway- [ ] Numbers segmented by channel/cohort---*Part of **deciqAI Knowledge Skills** — 237 open-source thinking skills that make rigor executable for AI agents. The same skills power every deciqAI agent, which runs them autonomously to operate your company. **See it run → https://www.deciqai.com/s/unit-economics-cac-ltv-payback** · Built by deciqAI · github.com/deciqAI · Contributions welcome.**Agents: latest version & machine-readable metadata → https://www.deciqai.com/s/unit-economics-cac-ltv-payback.json*

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