What is a margin of safety?
In accounting and business management, the margin of safety is the difference between a company’s actual (or budgeted) sales and its break-even point — the level at which revenue exactly covers all fixed and variable costs. It represents the cushion a business has before it begins to incur a loss, making it a key metric for assessing financial resilience and operational risk.
The formula for margin of safety is:
Margin of Safety = (Actual Sales – Break-Even Sales) ÷ Actual Sales × 100
The result is expressed as a percentage, indicating how much sales revenue could decline before the business becomes unprofitable.
How to interpret the margin of safety
A higher margin of safety indicates lower financial risk — the business can absorb a significant drop in sales without falling into a loss. Conversely, a low margin of safety suggests that even a modest reduction in sales could push the business into unprofitable territory.
For example, if a business has actual sales of $200,000 and a break-even point of $120,000, the margin of safety is $80,000 — or 40%. This means sales would need to fall by more than 40% before the business starts losing money.
The margin of safety in investing
In investment analysis, the margin of safety carries a different meaning: it refers to the difference between the intrinsic value of a stock and its current market price. Buying a stock at a significant discount to its intrinsic value provides a financial buffer against uncertainty or valuation errors — a principle closely associated with value investing.
For Australian business owners, tracking the margin of safety helps with budgeting, pricing decisions, and strategic planning, particularly during periods of economic uncertainty or fluctuating demand.