ABC overhead allocation is particularly helpful when overhead costs vary by activity and are incurred across multiple products and processes.

• A. It is unnecessary when costs are uniform
• B. It is useful when overhead varies by activity and product variety
• C. It should never be used in manufacturing
• D. It is only used in service industries

Answer: (B)

Overhead allocation works best when costs come from different activities that drive expenses and these activities affect products or processes in varying ways. Activity-based costing breaks overhead into activity cost pools and assigns those costs to products based on how much each product uses those activities, rather than spreading overhead evenly by volume. When overhead varies by activity and there’s a mix of products and processes, ABC provides a more accurate picture of what each product truly costs, which supports better pricing, profitability analysis, and strategic decisions.

If overhead were truly uniform across all products, a simpler costing method could suffice, so ABC isn’t necessary in that case. It’s not limited to manufacturing; it’s widely used in manufacturing too because many overhead costs come from activities like setup, quality inspection, and engineering changes. This approach is also not confined to service industries; it’s applicable wherever activities drive costs across a range of products or processes.