Why Traditional P/E Fails (And What to Use Instead)
When earnings are negative, the P/E ratio produces nonsense. A company losing $2 per share at a $50 stock price has a P/E of -25x. That number tells you nothing about whether the stock is cheap or expensive.
The point is: Negative earnings do not mean a company has no value. They mean you need different tools.
The valuation challenge breaks into three pieces:
- Revenue multiples to establish relative value when profits do not exist
- Unit economics to determine whether profits can ever exist
- Path to profitability analysis to estimate when losses turn into earnings
Get all three right, and you can value companies that traditional metrics cannot touch.
Revenue Multiples: The First Alternative
When earnings fail, revenue becomes the denominator. Two ratios dominate:
EV/Revenue = Enterprise Value / Total Revenue
For a company with:
- Market cap: $800 million
- Total debt: $100 million
- Cash: $150 million
- Trailing revenue: $200 million
EV = $800M + $100M - $150M = $750M EV/Revenue = $750M / $200M = 3.75x
EV/ARR (for SaaS businesses) uses Annual Recurring Revenue instead of total revenue. This is more relevant for subscription businesses because it excludes one-time fees and services that do not recur.
Why this matters: A SaaS company with $100M ARR trading at 8x EV/ARR is valued at $800M enterprise value. The multiple tells you what the market pays per dollar of recurring revenue.
Current benchmarks (2024):
- High-growth SaaS (50%+ growth): 10-15x ARR
- Moderate-growth SaaS (20-50% growth): 5-10x ARR
- Slow-growth SaaS (<20% growth): 2-5x ARR
The signal worth remembering: Revenue multiples let you compare unprofitable companies, but they only work if you believe margins will eventually materialize. A 10x revenue multiple on a company that will never be profitable is just paying for losses at scale.
Unit Economics: The Profitability Test
Before accepting any revenue multiple, you need to verify that the business can make money at the individual customer level. Three metrics matter:
Customer Acquisition Cost (CAC): Total sales and marketing spend divided by new customers acquired
Lifetime Value (LTV): Average revenue per customer times gross margin times average customer lifespan
LTV/CAC Ratio: Should exceed 3x for a healthy business
Example calculation:
- Annual contract value: $12,000
- Gross margin: 75%
- Average customer lifespan: 4 years
- Sales & marketing spend: $2M
- New customers acquired: 200
LTV = $12,000 x 0.75 x 4 = $36,000 CAC = $2,000,000 / 200 = $10,000 LTV/CAC = $36,000 / $10,000 = 3.6x
This company generates $3.60 in customer value for every dollar spent acquiring them. The unit economics work.
The point is: If LTV/CAC is below 1x, the company destroys value with every customer it acquires. No amount of growth fixes this.
Gross margin trajectory matters equally. A company at 50% gross margin heading toward 70% (as it scales infrastructure) is fundamentally different from one stuck at 50%.
Path to Profitability Analysis
Revenue multiples and unit economics establish that profits are possible. Path to profitability analysis estimates when they arrive.
The framework:
- Project revenue growth for 5-7 years based on historical rates and market opportunity
- Model gross margin expansion as scale benefits kick in
- Estimate operating expense leverage (sales and G&A as declining percentage of revenue)
- Identify the breakeven year when operating income turns positive
- Calculate steady-state margins once the company matures
Why this matters: A company reaching profitability in Year 3 is worth significantly more than one reaching profitability in Year 7, all else equal. The time value of money penalizes distant profits.
Red flags in path analysis:
- Breakeven year keeps pushing further out with each quarterly update
- Management cannot articulate specific margin improvement drivers
- Operating expenses grow faster than revenue despite claims of leverage
- R&D spend increases as percentage of revenue (not decreasing)
The key insight: Path to profitability is not a promise; it is a testable hypothesis. Track quarterly results against management projections. Consistent misses mean the path does not exist.
DCF with Negative Earnings: The Full Model
You can apply discounted cash flow analysis to unprofitable companies by explicitly modeling the loss years and subsequent margin expansion.
The structure:
- Years 1-3: Negative free cash flow (high growth, heavy investment)
- Years 4-5: Breakeven (growth moderates, margins improve)
- Years 6+: Positive free cash flow (mature business)
- Terminal value: Applied to normalized cash flow in final projection year
Key modifications from standard DCF:
- Use higher discount rates (12-15%+ for early-stage risk)
- Model operating margin expansion explicitly (not constant margins)
- Weight terminal value more heavily (often 70-80%+ of value)
- Use probability adjustments for execution risk
The point is: Early-stage DCF is not precise. It establishes a range of plausible values and identifies which assumptions matter most.
Worked Example: SaaS Company with -20% Margins and 50% Growth
Consider CloudCo, a SaaS company with:
- Current ARR: $100 million
- Growth rate: 50% annually
- Gross margin: 72%
- Operating margin: -20%
- LTV/CAC: 4.0x
- Net revenue retention: 115%
Step 1: Revenue projection (assuming growth decelerates)
| Year | ARR | Growth |
|---|---|---|
| 0 | $100M | - |
| 1 | $150M | 50% |
| 2 | $210M | 40% |
| 3 | $273M | 30% |
| 4 | $328M | 20% |
| 5 | $377M | 15% |
Step 2: Margin expansion model
| Year | Gross Margin | Operating Margin |
|---|---|---|
| 0 | 72% | -20% |
| 1 | 74% | -12% |
| 2 | 76% | -4% |
| 3 | 77% | 5% |
| 4 | 78% | 12% |
| 5 | 80% | 18% |
Step 3: Calculate operating income
| Year | ARR | Op. Margin | Operating Income |
|---|---|---|---|
| 1 | $150M | -12% | -$18M |
| 2 | $210M | -4% | -$8.4M |
| 3 | $273M | 5% | $13.7M |
| 4 | $328M | 12% | $39.4M |
| 5 | $377M | 18% | $67.9M |
Step 4: Terminal value
Using 15x terminal operating income: $67.9M x 15 = $1,019M
Step 5: Discount to present value at 14% WACC
- PV of Years 1-5 operating income: ~$35M (net of losses and gains)
- PV of terminal value: $1,019M / (1.14)^5 = $529M
Enterprise Value: ~$564M EV/ARR: 5.6x current revenue
Interpretation: At 5.6x ARR, you are paying for the margin expansion story. If margins fail to improve, the value collapses. If growth stays higher longer, the value increases substantially.
Venture-Style Valuation: Probability-Weighted Scenarios
For companies with high uncertainty, assign probabilities to discrete outcomes rather than using a single forecast.
Three-scenario framework:
Bull case (25% probability): Management executes perfectly
- Year 5 revenue: $500M
- Exit multiple: 8x revenue
- Exit value: $4.0B
- Present value at 20% discount: $1.61B
- Probability-weighted: $403M
Base case (50% probability): Moderate success
- Year 5 revenue: $350M
- Exit multiple: 5x revenue
- Exit value: $1.75B
- Present value: $703M
- Probability-weighted: $352M
Bear case (25% probability): Competition wins, growth stalls
- Year 5 revenue: $150M
- Exit multiple: 2x revenue
- Exit value: $300M
- Present value: $121M
- Probability-weighted: $30M
Probability-weighted value: $403M + $352M + $30M = $785M
What this means in practice: Venture-style valuation makes uncertainty explicit. Instead of hiding risk in a discount rate, you model what happens if things go wrong (or right).
Why this matters: A company worth $1.6B in the bull case and $121M in the bear case requires different position sizing than one worth $800M in all scenarios.
Red Flags: When to Walk Away
Some unprofitable companies never reach profitability. Watch for these warning signs:
Structural unprofitability:
- Gross margins below 40% with no path to improvement
- LTV/CAC below 1.5x after years of operation
- Customer acquisition costs increasing year over year
- Net revenue retention below 100% (customers leaving)
Execution problems:
- Four consecutive quarters of missed guidance
- CFO turnover (especially during growth phase)
- Restatements of previously reported ARR or revenue
- Stock-based compensation exceeding 25% of revenue
Market problems:
- TAM (total addressable market) shrinking or saturating
- New entrants offering equivalent product at lower price
- Major customer concentration (top 10 customers >40% of revenue)
- Lengthening sales cycles without explanation
The point is: Every unprofitable company has a story about future profits. The red flags tell you when the story is fiction.
The test: If the company raised no more capital today, could it reach breakeven on existing cash? If the answer is no (and it keeps not being yes), the path to profitability may not exist.
Putting It Together: A Valuation Checklist
Before assigning any multiple to an unprofitable company:
- Calculate LTV/CAC from disclosed metrics. Is it above 3x?
- Verify gross margin trajectory. Is it improving or flat?
- Model the path to profitability year by year. When does operating income turn positive?
- Run a DCF with explicit loss years. What terminal assumptions are required to justify current price?
- Build probability-weighted scenarios. What is the bear case worth?
- Check for red flags. Does management have a credible execution track record?
If you cannot answer these questions with data (not narratives), you are speculating rather than valuing.
Next Steps
-
Select an unprofitable company in your portfolio or watchlist. Calculate its EV/Revenue and EV/ARR multiples. Compare to sector benchmarks.
-
Find the LTV/CAC ratio in company disclosures or earnings presentations. Many SaaS companies publish this directly. If it is below 3x, investigate why.
-
Build a simple spreadsheet projecting revenue and operating margins for 5 years. Identify the breakeven year. If breakeven is beyond Year 5, stress-test your assumptions.
-
Create three scenarios (bull, base, bear) with explicit probabilities. Calculate the probability-weighted present value. Compare to current market cap.
-
Read the most recent 10-Q or earnings call transcript. Flag any red flags from the list above. If you find two or more, consider reducing position size.
Related Articles
- Revenue Multiples for High-Growth Firms
- Adjusting for Share-Based Compensation and Dilution
- Scenario and Sensitivity Analysis Techniques
- Using Comparable Transactions Data
References
Damodaran, A. (2009). Valuing Young, Start-Up and Growth Companies: Estimation Issues and Valuation Challenges. Stern School of Business Working Paper. Available at: http://pages.stern.nyu.edu/~adamodar/
Mauboussin, M. J., & Rappaport, A. (2021). Expectations Investing: Reading Stock Prices for Better Returns. Columbia Business School Publishing. Chapters on early-stage company valuation.
SaaS Capital (2024). What Are Typical SaaS Valuation Multiples? Annual benchmark report on private and public SaaS valuations.
Koller, T., Goedhart, M., & Wessels, D. (2020). Valuation: Measuring and Managing the Value of Companies, 7th Edition. John Wiley & Sons. Chapter 30: Valuing High-Growth Companies.
