Comprehensive and Detailed Explanation (paraphrased from CIPS L4M2 content)
CIPS L4M2 defines fixed costs as those that do not change in total with small changes in the level of activity within a relevant range (for example, rent, insurance, basic utilities standing charges).
Premises costs (C) – such as rent and building insurance, are typically fixed: they are paid regardless of production volume (within normal operating levels).
Utilities costs (D) – often treated as fixed or semi-fixed in exam-style questions: the organisation pays standing charges and must maintain services regardless of output.
In contrast:
Staff overtime (A) – varies with workload; this is a variable cost.
Sales commission (B) – depends on sales volume, so it is variable.
Materials costs (E) – directly linked to output (more units = more materials), so variable.
Understanding fixed versus variable costs is vital when preparing a business case (e.g. break-even, sensitivity analysis, and assessing the impact of demand changes).
Relevant CIPS L4M2 areas:
Cost behaviour: fixed, variable, semi-variable
The role of cost analysis in business cases and sourcing decisions
Overhead allocation and cost structures