Difficulty: Intermediate | Prerequisites: Introduction to cost accounting, overhead allocation basics, standard costing.
Anagene Inc. is a genomics technology company used as a case study in managerial and cost accounting courses to illustrate the problems that arise when a young, fast-changing company relies on budgeted volumes to allocate overhead. The case sits at the intersection of standard costing, overhead allocation, and capacity analysis. If you are comfortable with how overhead rates are built from estimated volumes, this case shows you what goes wrong when those estimates are wildly off, and what a better denominator looks like.
You should already understand basic product costing, the difference between fixed and variable costs, and how predetermined overhead rates work. If those concepts are not solid, revisit them before reading these notes.
Anagene is a young genomics firm whose gross margins swing wildly month to month because its cost system uses budgeted sales volumes as the overhead allocation base, and those budgets are nowhere near actual results. The fix proposed in the case is to switch the allocation base from budgeted volume to practical capacity, which stabilises product costs and makes unused capacity visible as a separate line item.
Predetermined overhead rate
The rate calculated at the start of a period by dividing estimated total overhead costs by an estimated allocation base (such as budgeted units or machine hours). It is used to apply overhead to products before actual figures are known.
In simple terms, this is the "best guess" rate a company sets in advance so it can price products and track costs without waiting for the books to close.
Budgeted volume (as allocation base)
The forecasted number of units (or other activity measure) a company expects to produce or sell, used as the denominator when computing the overhead rate.
Think of it as the number the company plugged into the bottom of the overhead-rate fraction. When actuals diverge from this number, the rate becomes misleading.
Practical capacity
The maximum output a resource can sustain under normal operating conditions, after subtracting expected downtime for maintenance, holidays, and similar interruptions. It does not assume perfect, round-the-clock operation.
In simple terms, this is the realistic ceiling of what a factory or department can produce, not the dream scenario and not the actual output in any one period.
Gross margin
Revenue minus cost of goods sold, expressed as a currency amount or a percentage of revenue. It measures how much of each sales pound or dollar is left after covering direct production costs.
Think of it as the profit on the product itself, before you pay for sales staff, rent on the head office, or anything else that is not directly tied to making the product.
Unused capacity cost
The portion of fixed overhead attributable to capacity that was available but not used. When practical capacity is the allocation base, this cost appears as a separate line item rather than being hidden inside the product cost.
In simple terms, it is the cost of resources you are paying for but not using. A practical-capacity system forces you to see it rather than burying it in the cost of whatever you did produce.
Cost system (standard cost system)
A system that assigns costs to products using pre-set (standard) rates rather than tracking every actual cost as it occurs. It simplifies accounting but relies on the accuracy of those standards.
Think of it as the company's internal pricing engine: it stamps a cost onto each unit based on what costs "should" be, then reconciles later with what they actually were.
Anagene's cost system uses budgeted (forecasted) sales volumes as the denominator in overhead rate calculations, rather than actual volumes or practical capacity.
The company is young and operates in genomics, a field with long sales cycles and unpredictable demand. This makes budgeted volumes unreliable by nature.
Example from the case: Anagene forecast 50,000 cartridge sales; actual sales came in at 26,000, roughly half the estimate.
Long sales lead times. Genomic assessments are complex. Customers take longer to evaluate and commit, stretching the sales cycle well beyond what the budget assumed.
Slower workstation sales. The installed base of Anagene workstations grew more slowly than expected, which capped the addressable market for cartridges.
Cartridge reuse. Customers found ways to reuse disposable cartridges instead of ordering replacements, reducing repeat purchase volume.
When budgeted volume is the denominator and actuals come in far below it, the overhead rate understates the true cost per unit during the budget period.
Conversely, if the company then adjusts or reconciles at period end, the variance is large and the gross margin swings sharply.
Because Anagene is also launching new products into new markets, actual volumes are doubly unstable: the base business is unpredictable and the new lines have no history to forecast from.
The result is gross margins that fluctuate month to month in ways that make it difficult for Gerald Kelly (president and CFO) to assess whether the company is genuinely profitable or simply riding volume noise.
Instead of dividing budgeted overhead by budgeted volume, the case proposes dividing it by practical capacity: the maximum output the resources can realistically sustain.
Practical capacity strips out expected downtime (maintenance, holidays) but does not assume perfect utilisation. It is a stable, engineering-based number rather than a sales forecast.
Using practical capacity as the denominator produces a lower, more stable overhead rate per unit. The rate does not bounce around with each month's sales forecast revision.
The cost that is "left over" (the overhead attributable to capacity you have but did not use) is reported separately as unused capacity cost. It sits on the income statement as a period expense, not inside the product cost.
This separation is the key insight of the case: it forces management to see how much they are paying for idle resources, rather than hiding that cost inside the price of every unit they ship.
This is not a textbook-only problem. Any company with high fixed costs and volatile demand faces the same overhead allocation question: semiconductor fabs, airlines, hospitals, and cloud-computing providers all grapple with how to cost their output when utilisation swings. The practical-capacity approach is standard in activity-based costing (ABC) implementations and is recommended by scholars such as Kaplan and Anderson precisely because it prevents idle-capacity costs from distorting product-level profitability.
Students often think practical capacity means theoretical (maximum possible) capacity. It does not. Practical capacity accounts for expected downtime; theoretical capacity assumes the plant runs flat out, 24/7, with no interruptions.
Students sometimes assume that unused capacity cost is "wasted" money that should be eliminated immediately. In reality, some unused capacity is strategic: you may hold spare capacity to handle demand surges, new product launches, or seasonal peaks. The point is to see it, not to treat it as inherently bad.
A common error is believing that switching to practical capacity changes total costs. It does not. Total overhead stays the same. What changes is where it shows up: some in the product cost, the rest as a visible unused-capacity line. The pie is the same size; you are slicing it differently.
Students occasionally confuse the allocation base (the denominator) with the cost pool (the numerator). Anagene's problem is with the denominator, not the total overhead dollars in the numerator.
⚠️ Be prepared to explain why budgeted volume is a poor allocation base for a young, high-growth company with unpredictable demand.
⚠️ Know how to compute an overhead rate using practical capacity and contrast the resulting product cost with one computed using budgeted volume.
⚠️ Expect a question asking you to identify and quantify unused capacity cost when practical capacity is the denominator.
⚠️ Understand the managerial implications: practical capacity makes idle resources visible, which supports better decisions about pricing, outsourcing, and capacity planning.
⚠️ Be able to distinguish between practical capacity, theoretical capacity, normal capacity, and budgeted volume as alternative denominators, and state when each is appropriate.
True or false: Practical capacity assumes the plant runs at 100% utilisation with no downtime.
False. Practical capacity subtracts expected downtime.
Fill in the blank: Anagene forecast ______ cartridge sales, but actual sales were only ______.
50,000; 26,000.
True or false: Switching the allocation base from budgeted volume to practical capacity changes total overhead costs.
False. Total overhead is unchanged; only its distribution between product cost and unused-capacity cost changes.
Fill in the blank: The cost of resources available but not used is called ______ ______ cost.
Unused capacity cost.
True or false: One reason Anagene's cartridge sales underperformed was that customers reused disposable cartridges.
True.
Q: Why does Anagene's current cost system produce unreliable gross margins?
A: Because the system uses budgeted sales volume as the overhead allocation base, and those budgets are far from actual results. When actual volume falls well short of the forecast, the overhead rate either understates product cost during the period or creates large variances at reconciliation, causing gross margins to swing unpredictably.
Q: What is practical capacity, and why is it proposed as a better allocation base for Anagene?
A: Practical capacity is the maximum output a resource can sustain under normal operating conditions, minus expected downtime. It is proposed because it is a stable, engineering-based figure that does not change with each sales forecast revision. Using it as the denominator produces a consistent overhead rate and separates unused-capacity cost into its own visible line item.
Q: Identify three factors that caused Anagene's actual cartridge sales to fall short of budget.
A: (1) Longer-than-expected sales lead times due to the complexity of genomic assessments, (2) slower-than-expected workstation sales reducing the installed base, and (3) customers reusing disposable cartridges instead of purchasing replacements.
Q: How does using practical capacity change the way unused capacity appears in the financial statements?
A: Under a budgeted-volume system, the cost of unused capacity is buried inside the product cost of units actually produced (or surfaces as a large variance). Under a practical-capacity system, unused capacity cost is reported separately as a period expense, making it visible to management.
Q: Does switching to a practical-capacity allocation base increase or decrease total overhead costs?
A: Neither. Total overhead remains the same. The change affects only how that total is split between product cost and a separate unused-capacity line. It is a reallocation, not a cost increase.
This case connects directly to activity-based costing (ABC), which also uses practical capacity as the recommended denominator for cost-driver rates. If your course covers ABC or time-driven ABC later, the Anagene case is the motivating example for why the denominator matters.
It also ties into variance analysis: the gap between budgeted and actual volume creates a volume variance (or production-volume variance) that is central to standard costing chapters. Understanding Anagene helps you see why that variance can be enormous in young companies.
More broadly, the case is an entry point into capacity management and strategic cost analysis, topics that surface in advanced managerial accounting and operations management courses.
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