Growth • Unit Economics
SaaS / Fintech Unit Economics
Connect acquisition and retention to contribution margin, payback, and scalable growth.
CAC / LTV
Contribution Margin
Payback
Run-Rate Forecast
📂 Data needed for this module
CAC by Channel
Marketing & sales spend per channel vs. new customers won → CAC
Cohort Retention Data
Monthly revenue retained per cohort → LTV curve shape
COGS Breakdown
Direct costs to serve one customer → contribution margin per unit
P&L / Income Statement
Revenue, gross margin & OpEx → payback & profitability context
Growth & Churn Metrics
Monthly new, churned & expanded customers → run-rate forecast
Decision
Load data to see the decision.
Board View — Executive Summary
Capital Health
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Runway
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Funding Requirement
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Primary Risk
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Top Levers
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Recommendation
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Capital Allocation — Growth Investment Scenario
Model the operational impact of a growth investment without complex valuation math. Focused on payback and runway impact.
Working Capital — Cash Flow Timing Impact
Simple approximation for planning purposes. Not a full balance sheet model.
1. CAC / LTV Engine
Customer Acquisition Economics
Payback Sensitivity — Stress Testing Assumptions
2. Contribution Margin Analysis
Monthly Contribution
Contribution Margin Trend
3. Run-rate Forecasting
Forward Projection
MRR & Customer Projection
4. Cash & Runway Impact
Liquidity & Survival Analysis
Strategic Implication: Understanding runway is critical for capital allocation decisions. If runway < 12 months, growth initiatives compete with survival. If runway > 24 months, you can invest aggressively in scaling.
5. Integration Into Enterprise Financial Model
Unit economics doesn't live in isolation. Each metric feeds into enterprise-level planning and decision-making.
CAC → Operating Expense
Customer acquisition costs flow into Sales & Marketing budgets. Rising CAC increases OpEx and pressures EBITDA margins.
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Churn → Revenue Forecast
Monthly churn directly reduces ARR growth. A 5% churn rate means you lose 5% of your revenue base every month, requiring constant new customer acquisition just to maintain revenue.
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Payback → Cash Flow Timing
Longer payback periods create working capital needs. If payback is 18 months but you're growing 10% monthly, you need external capital to fund the working capital gap.
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Burn → Balance Sheet & Capital Needs
Monthly burn determines how much cash you need on the balance sheet. High burn with long payback means frequent fundraising. Low burn with short payback enables organic growth without dilution.
CFO Takeaway: Unit economics is the engine that drives the entire financial model. Improving LTV:CAC by 20% doesn't just make sales more efficient—it reduces OpEx, extends runway, delays the next fundraise, and improves company valuation by demonstrating capital efficiency.
Scope Note: This module focuses on SaaS unit economics and cash runway. It does not fully model working capital schedules such as:
- AR (Accounts Receivable) timing and collection
- Deferred Revenue unwinding
- AP (Accounts Payable) payment timing
- Inventory (not applicable to SaaS)
Future Enhancement: Full working capital modeling would connect billing cycles, payment terms, and cash conversion cycles to provide a more complete liquidity picture.
What This Demonstrates
Growth Analytics That Doesn't Lie
Moving beyond vanity metrics to understand true unit profitability, payback dynamics, and sustainable scaling models.
Finance-Grade Unit Economics
CAC/LTV with churn sensitivity, contribution margin decomposition, and run-rate forecasting built for decision-making.
Scenario-Driven Risk Visibility
Instant upside/downside modeling with risk flagging for churn spikes, negative CM, and extended payback periods.