Margin of Safety
A margin of safety is the gap between your estimate of value and the price you pay. It exists because every estimate contains error.
Why this matters for beginners
You cannot remove uncertainty from valuation. A margin of safety means moderate errors produce mediocre results rather than permanent losses.
Main explanation
If you estimate a business is worth 100 per share and pay 70, the thirty percent discount absorbs a degree of error in your assumptions.
The required margin depends on confidence. Predictable businesses justify smaller discounts; cyclical or opaque ones require far more.
A margin of safety is not the same as a low multiple. It is a discount to your own estimate, which may be lower than the current price.
It also affects behaviour. Buying with a discount makes it easier to hold through volatility because the decision did not depend on precision.
Example using a real company
Estimating value at 100 and paying 70 means your estimate can be twenty percent too optimistic and the purchase still works.
- →Stable business: a 20 to 25 percent discount may be enough.
- →Cyclical business with uncertain earnings: 40 percent or more may be appropriate.
Common beginner mistakes
- ✕Treating a low multiple as automatic margin of safety.
- ✕Using the same discount for every business.
- ✕Adjusting the estimate upward to justify the current price.
Key terms
- Margin of safety
- The discount between estimated value and price paid.
- Intrinsic value
- Your estimate of what a business is worth.
- Estimate error
- The unavoidable inaccuracy in any valuation.
Key takeaways
- 01The discount absorbs errors in your assumptions.
- 02Less predictable businesses require larger discounts.
- 03It is a discount to your estimate, not to a peer multiple.
Check yourself
- 01A margin of safety is measured against your own estimate of value.
- 02A low price-to-earnings ratio automatically provides a margin of safety.
- 03Less predictable businesses justify a larger discount.
Try the concept on a real company
Use the Analyzer to form a rough value range for a company, then note what price would give you a comfortable discount.
Educational examples only. Not buy or sell recommendations.