Margin of Safety
How far sales can fall before the business hits its break-even point.
Formula
Variables
Example
($100k − $60k)/$100k = 40%
How it works
The margin of safety measures the buffer between current sales and the break-even level, showing how much sales could drop before the business stops making a profit and starts incurring a loss. It works by comparing the excess sales over break-even to total sales, then expressing that buffer as a percentage of sales so it is easy to judge the risk level. A higher margin of safety means the business has more room to absorb a fall in demand; a lower one means it is more exposed.
When to use it
Use this formula when analysing business risk, especially in budgeting, pricing decisions, or profit planning. It is common in cost-volume-profit analysis to assess how safe current sales are relative to the break-even point.
Worked example, step by step
Actual sales = $250,000 Break-even sales = $190,000 MoS = (Sales - Break-even) / Sales × 100% MoS = ($250,000 - $190,000) / $250,000 × 100% MoS = $60,000 / $250,000 × 100% MoS = 0.24 × 100% MoS = 24% Final answer: The margin of safety is 24%, so sales could fall by 24% before the business reaches break-even.
Common mistakes to avoid
- Using total profit instead of the difference between actual sales and break-even sales
- Dividing by break-even sales instead of actual sales
- Forgetting to convert the result into a percentage
Did You Know?
A thin margin of safety warns that a small dip in sales could push a firm into a loss.
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