Fixed Cost vs Variable Cost
Knowing which costs are which is how you actually price and plan. Fixed costs and variable costs behave differently as you sell more, and confusing the two leads to bad pricing, wrong break-even math, and ugly surprises when sales slow down.
Fixed Cost
Fixed costs stay the same no matter how much you sell. You pay them whether you have one customer or one thousand. Common examples are rent, salaries, insurance, software subscriptions, and loan payments.
Variable Cost
Variable costs rise and fall with how much you produce or sell. The more units you move, the more you pay. Common examples are raw materials, shipping, packaging, transaction fees, and sales commissions.
Fixed Cost vs Variable Cost: side by side
| Dimension | Fixed Cost | Variable Cost |
|---|---|---|
| Behavior with volume | Stays flat as sales go up or down. | Increases as you produce or sell more. |
| Examples | Rent, salaries, insurance, software subscriptions, loan payments. | Materials, shipping, packaging, transaction fees, commissions. |
| Effect on break-even | Higher fixed costs mean you need more sales to cover your baseline. | Higher variable costs mean each sale is less profitable, so you need higher prices or volume. |
| How it affects pricing | You must spread fixed costs across enough sales to make each unit profitable. | Every sale must cover its own variable cost before it contributes to fixed costs and profit. |
Which one, when?
Fixed Cost: Watch fixed costs for your baseline burn. These are the costs you must cover even when revenue is zero. They set the minimum sales you need to survive and they create leverage when sales grow because they do not rise with volume.
Variable Cost: Watch variable costs for per-sale profitability. These costs tell you whether each additional sale is actually worth making. If variable costs eat too much of the price, raising volume will not save you.
Frequently asked questions
Is rent a fixed or variable cost?
Rent is a fixed cost. You pay the same amount each month regardless of how much you sell. It is one of the classic examples of a fixed cost for most businesses.
Are salaries fixed or variable?
Most salaries are fixed costs because you pay them no matter how much you sell. Some pay structures include commissions or bonuses that change with sales, and those parts are variable. But the base salary is fixed.
Why do fixed and variable costs matter for pricing?
Pricing has to cover both. If you only cover variable costs, every sale still loses money after fixed costs are counted. If you only cover fixed costs and ignore variable costs, you will underprice and lose money on each unit. Smart pricing covers variable cost first, then contributes to fixed costs, then leaves profit left over.
Now run your own numbers
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