Definition
Margin of safety is the buffer between estimated intrinsic value and purchase price, used to protect against uncertainty.
Formula
Margin of safety = (intrinsic value - price) / intrinsic value
Example
If intrinsic value is $100 and price is $70, margin of safety is 30%.
How to use it
- Use larger margins of safety when assumptions are uncertain.
- Combine with sensitivity analysis to test downside risk.
Common mistakes
- Treating a single valuation point as precise truth.
- Ignoring changes in discount rates or growth expectations.
Measured as
Margin of safety = (intrinsic value - price) / intrinsic value
Misused when
- Treating a single valuation point as precise truth.
- Ignoring changes in discount rates or growth expectations.
Operator takeaway
- Use larger margins of safety when assumptions are uncertain.
- Combine with sensitivity analysis to test downside risk.
- Tie Margin of Safety to the same balance-sheet date, scenario, and decision memo you are using elsewhere in the model.
- Document which claims, costs, or adjustments your team includes before comparing numbers across forecasts, covenants, or valuation work.
Next decision
- Read DCF valuation: forecast cash flows, discount rate, and terminal value if the decision depends on interpretation, policy, or trade-offs beyond the raw formula.
- Decide whether Margin of Safety belongs in cash planning, valuation, or debt monitoring so the number is used in the right model.
Where to use this on MetricKit
Guides
- DCF valuation: forecast cash flows, discount rate, and terminal value: A practical guide to DCF valuation and WACC discount rate choices: how to forecast FCF, choose a discount rate, and avoid terminal value traps.
- DCF sensitivity guide: WACC, terminal growth, valuation: How to run a DCF sensitivity table, choose defensible WACC and terminal growth ranges, and judge whether valuation is robust.