What is the Difference Between Relevant and Irrelevant Cost?

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The difference between relevant and irrelevant costs lies in their impact on managerial decisions. Here is a breakdown of the two types of costs:

Relevant Costs:

  • These are costs that will be affected by a managerial decision.
  • Relevant costs can be avoided or adjusted when a business is in the decision-making process.
  • They are also known as avoidable, differential, or incremental costs.
  • Relevant costs are useful for managers making decisions about the best course of action for the company.

Irrelevant Costs:

  • These are costs that will not change in the future when making one decision versus another.
  • Irrelevant costs are either positive or negative and are not impacted by a management decision.
  • They include sunk costs, committed costs, and fixed overheads, as these cannot be avoided.
  • Non-cash items, such as depreciation and amortization, are also considered irrelevant costs.
  • Irrelevant costs are not considered in the decision-making process, as they do not contribute to the evaluation of alternatives.

In summary, relevant costs are those that are affected by a managerial decision and are used to evaluate alternatives, while irrelevant costs are not impacted by the decision and are not considered in the evaluation process.

Comparative Table: Relevant vs Irrelevant Cost

The difference between relevant and irrelevant costs can be summarized in the following table:

Relevant Costs Irrelevant Costs
Affected by a managerial choice in a certain business situation. Would not be affected by a management decision.
Incurred when making business decisions since they affect the decision-making process. Have already been incurred or are not affected by the decision being made.
Examples include future cash flows, avoidable costs, and opportunity costs. Examples include committed costs, non-cash expenses (depreciation and amortization), and overheads.
Relevant costs are considered in decisions regarding shutting down or carrying on a business division, accepting or rejecting a special order, making a product in-house or buying from outside, and selling a semi-finished product or processed one. Irrelevant costs are not considered in decision-making processes as they do not affect the outcome of the decision.

Relevant costs are also referred to as differential costs or avoidable costs, while irrelevant costs are sometimes called committed costs. It is essential to understand the difference between relevant and irrelevant costs to make critical decisions in a business, as these costs can either make the company more profitable or put it under financial strain.