Cost Accounting A Managerial Emphasis 14th Edition Chapter 5 Solutions

Working Through Chapter 5 of Horngren's Cost Accounting

Chapter 5 covers overhead allocation, and it is where most students hit their first real wall. The chapter moves from single-rate methods to dual-rate methods, then into activity-based costing, and finally touches on normal versus abnormal spoilage treatment. It sounds straightforward until you try to apply it to a problem with multiple cost pools and different allocation bases. I spent more time wrestling with a single overhead question than I did on the rest of the chapter combined. The core idea is that overhead never goes directly into a product the way direct materials and direct labor do. You have to assign it using some kind of allocation base, and that is where things get complicated. A predetermined overhead rate is calculated before the period starts, usually by taking estimated total overhead and dividing it by an estimated allocation base like direct labor hours or machine hours. When actual costs come in at the end of the period, they rarely match what you allocated, so you end up with either underallocated or overallocated overhead that needs to be dealt with.

Cost Accounting A Managerial Emphasis 14th Edition Chapter 5 Solutions

If you are looking for worked solutions, the official solution manual for this text is available through Pearson or various academic resource sites. Many students find it at first through course reserves or the publisher's companion website. The key thing to remember is that having the solution is not the same as understanding the method. I have seen students copy the numbers without grasping why a particular rate was chosen, and that breaks down fast when the professor changes a single assumption in the problem. Here is what actually happens when you work through the problems. You start with estimated overhead costs broken into cost pools, identify the allocation base for each pool, compute the rate, then apply it to the actual level of the base. For example, if your machining overhead pool is $480,000 and your allocation base is 60,000 machine hours, your rate is $8 per machine hour. If you actually ran 58,000 hours, you allocate $464,000. Then you compare that applied amount to what you actually spent. If actual overhead was $510,000, you have $46,000 underallocated, which you write off to cost of goods sold or prorate across inventories depending on what the problem asks for. The dual-rate method adds another layer because it separates variable and fixed overhead into two pools. This means two different rates instead of one. The variable rate uses actual activity, while the fixed rate is based on budgeted capacity. I ran into a specific issue once where the problem stated capacity in units produced but the allocation base was machine hours, and those two measures did not line up neatly. I had to convert the capacity figure by using the standard hours per unit, which the problem did not spell out explicitly. Once I worked through that mismatch, the numbers started making sense. The textbook hints at this conversion step but does not always walk through it clearly, which is why the solution manuals are useful for checking your setup.

Activity-based costing in this chapter follows the usual pattern of identifying activities, grouping costs into pools, selecting drivers, and computing rates. The counter-intuitive part that people miss is that ABC does not necessarily give you more accurate product costs just because it uses more cost pools. If your drivers are poorly chosen or if the activities do not actually drive the overhead costs you are assigning, you are just spreading error more precisely. I learned this the hard way on a case study where the engineering department tracked setup hours as the driver for quality inspection costs. Setup time had almost zero correlation with inspection labor, and the resulting cost distortions were worse than what a traditional single-rate system would have produced. Normal versus abnormal spoilage is another section that trips people up. Normal spoilage is treated as a product cost, meaning it stays in inventory and flows through to cost of goods sold when the product is sold. Abnormal spoilage is period cost, expensed immediately. The calculation involves determining the cost per good unit, then applying that to spoiled units. If a batch of 1,000 units has 40 normal spoiled units and each good unit carries $25 in overhead, you allocate $1,000 of spoilage cost into the good units rather than expensing it. Abnormal units get a separate write-off entry. One practical limitation of the methods in this chapter is that predetermined rates rely heavily on accurate estimates. If your estimated overhead or estimated allocation base is way off, every product cost downstream is distorted. This is especially problematic in environments with volatile energy prices or unpredictable maintenance schedules. In those cases, actual costing or hybrid approaches may be more appropriate, even though they are harder to implement operationally. The textbook focuses on standard budgeted rates because that is what most manufacturing firms actually use, but it is worth keeping in mind that the method has blind spots.

Another thing that is not always obvious from the chapter readings is how underallocated overhead gets closed out. The default approach in many problems is to write the entire variance to cost of goods sold at the end of the period. That is simple and fine when the amount is small relative to total COGS. But if your variance is large, prorating it between work in process, finished goods, and cost of goods sold gives a more accurate picture. Some instructors require the proration method, and you will lose points if you use the shortcut when the question expects the full allocation. Always check what the problem specifies before choosing how to close the variance. When you work through practice problems, I recommend starting with the simpler single-rate examples to get the mechanics down, then moving to dual-rate and ABC problems. The calculations are mechanically similar, but the setup and interpretation change significantly. Keep a running note on which base goes with which pool, because mixing those up is the most common error. Write out each step rather than jumping straight to the final rate. Most mistakes happen in the allocation base selection, not in the arithmetic itself.