Managerial-Accounting Relevant-Costing Relevant Costs vs Irrelevant Costs Sunk Costs Avoidable Costs

? What this actually is

Relevant costs vs. irrelevant costs is a concept in managerial accounting that helps decision-makers focus on costs that matter for a specific decision. Relevant costs are future costs that differ between alternatives, while irrelevant costs do not change regardless of the decision made. This matters because it ensures that managers make informed decisions based on costs that will actually affect the outcome, rather than being swayed by past expenses or fixed costs that won't change.

? The core logic (or formula)

1. Relevant Costs: Future costs that differ between alternatives.
2. Irrelevant Costs: Costs that do not differ between alternatives or are sunk costs.
3. Sunk Costs: Past costs that have already been incurred and cannot be recovered.
4. Avoidable Costs: Costs that can be eliminated by choosing one alternative over another.
5. Differential Costs: The difference in total cost between alternatives.

? Hidden rule nobody explains

In practice, managers often struggle with the concept of sunk costs. It's crucial to remember that sunk costs are irrelevant for future decisions because they have already been incurred and won't change regardless of the decision made. Focus on future costs that will differ between your options.

? Practical example / breakdown

Scenario: A company is deciding whether to continue with an existing project or to abandon it. The project has already incurred $50,000 in costs (sunk costs). If the project continues, it will incur an additional $30,000 in costs and generate $60,000 in revenue. If the project is abandoned, the company can avoid the additional $30,000 in costs but will not generate any revenue.

Step-by-Step Analysis: 1. Identify Sunk Costs: The $50,000 already spent is a sunk cost and is irrelevant for the decision.
2. Identify Relevant Costs: The additional $30,000 in costs if the project continues is a relevant cost.
3. Calculate Differential Costs:
- Continue the project: Additional cost = $30,000, Revenue = $60,000, Net Income = $30,000.
- Abandon the project: Additional cost = $0, Revenue = $0, Net Income = $0.
4. Make the Decision: Since continuing the project results in a net income of $30,000, while abandoning it results in $0, the company should continue the project.

? Your move today

Goal: Practice identifying relevant and irrelevant costs in a decision-making scenario.

Step-by-Step: 1. Find a recent decision your company or a case study faced.
2. List all the costs involved.
3. Categorize each cost as relevant or irrelevant.
4. Determine the differential costs between the alternatives.
5. Make a decision based on the relevant costs.

What to save: A table listing the costs, their categorization, and the final decision.

? Quick reference asset

⚠️ Common mistakes & recovery

• Common Error 1: Including sunk costs in the decision-making process.
• Recovery: Remind yourself that sunk costs are irrelevant because they won't change.
• Common Error 2: Not considering avoidable costs.
• Recovery: Always identify costs that can be eliminated by choosing one alternative over another.
• Quick Check: Ask yourself, "Are all the costs I'm considering future and differing between alternatives?"
• Exam Tip: Under time pressure, focus on identifying and eliminating sunk costs first to simplify the problem.

✅ Completion check

I can identify relevant and irrelevant costs in a decision-making scenario and make informed decisions based on differential costs.