Fixed Costs

Measured as

Measure Fixed Costs with the same date, unit basis, and accounting or policy definitions used in the rest of your model.

Misused when

• Classifying step-function costs as purely fixed.
• Ignoring fixed costs when setting break-even targets.
• Allocating fixed costs to units inconsistently across periods.
• Treating fixed costs as sunk when planning new programs.

Operator takeaway

• Fixed costs create operating leverage as revenue scales.
• Some costs are fixed only within a volume range (step costs).
• Separate fixed vs variable to compute contribution margin correctly.
• Tie Fixed Costs 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

• Quantify the impact with Break-even Pricing Calculator if you need to turn the definition into an operating assumption.
• Read Break-even pricing: contribution margin, break-even units, and profit if the decision depends on interpretation, policy, or trade-offs beyond the raw formula.