A cost driver is the factor or activity that causes costs to be incurred — the variable whose changes most directly cause corresponding changes in a particular cost element. Identifying cost drivers is central to both cost analysis and driver-based planning: when management understands which operational activities or business metrics drive which costs, they can model how cost changes will follow changes in business volume, product mix, or operational decisions, rather than simply extrapolating historical cost ratios.
Why This Matters
Understanding cost drivers transforms cost management from reactive to predictive. When management knows what drives each major cost line, they can model the cost implications of operational decisions before those decisions are made, rather than discovering cost impacts after the fact. Cost driver analysis also enables more accurate budgeting and forecasting by replacing historical percentage-based extrapolation with models that respond to actual changes in the underlying drivers of cost.
Where This Fits
This term sits within the Performance Analysis area of Performance & Control.
Related Terms
Related Knowledge
To be added when relevant Knowledge Hub articles are published