What Your Accountant Isn’t Telling You: Three Rules for Smarter Business Decisions
Profit-and-loss statements are essential for reporting performance to investors and other stakeholders. But when managers use them to make operational decisions, the same statements can sometimes point in the wrong direction.
The reason is simple: financial accounting is designed primarily to record and report historical results. Management accounting asks a different question-what will change if the business chooses one course of action rather than another?
That shift in perspective produces several counterintuitive rules. Three of them can materially improve decisions about products, reported profit and scarce resources.
1. Don’t Automatically Drop a “Loss-Making” Product
Suppose a monthly report shows that one product line is making a loss. The instinctive response is to discontinue it and stop the drain. Yet that decision can leave the company worse off.
The problem often lies in allocated overhead. Standard reports may assign each product a share of company-wide fixed costs, such as head-office rent or executive salaries. That allocation can make a product appear unprofitable even when its sales help cover costs the business will incur anyway.
The better test is incremental: compare the revenue that would be lost with the costs that would actually be avoided if the product disappeared.
Avoidable costs usually include the product’s variable costs and any fixed costs that exist solely because the product is offered. Unchanged corporate overhead is not relevant to the decision, because discontinuing the line will not eliminate it.
A reported loss may therefore conceal a positive contribution. If that contribution is removed while the overhead remains, the surviving products must carry a larger burden and total company profit may fall. Before closing a line, managers should ask not “Does it show a loss?” but “Will closing it improve total cash flow?”
2. The Same Month Can Produce Two Different Profit Figures
A company can report different profits for the same month even when sales and underlying costs are unchanged. The explanation lies in the treatment of fixed production overhead under absorption costing and marginal costing.
- Absorption costing includes both variable production costs and an allocation of fixed production overhead in the cost of each unit. Unsold units therefore carry some fixed overhead in inventory.
- Marginal costing charges only variable production costs to units and treats fixed production overhead as a period expense. It highlights the contribution each sale makes toward fixed costs and profit.
When production exceeds sales, absorption costing defers part of the period’s fixed production overhead in closing inventory. Profit can therefore appear higher than under marginal costing. When sales exceed production and inventory falls, the reverse effect can occur.
This difference matters because it can distort incentives. A manager may improve an absorption-costing profit figure by producing more units, even when demand has not increased, because more fixed overhead is carried forward in inventory. That does not mean absorption costing is wrong; it serves an important reporting purpose. But for short-term internal decisions, contribution and inventory movements often provide a clearer view of operating performance.
3. When Resources Are Scarce, Unit Cost Is Not the Deciding Factor
Every business has a constraint: a resource that limits how much it can produce or deliver. It may be machine time, specialist labour, production space or a critical material. Once that bottleneck is fully used, ordinary unit-cost comparisons are no longer enough.
Consider a company that can make several components more cheaply than it can buy them, but lacks enough skilled-labour hours to manufacture every component in-house.
Which items should it make, and which should it outsource?
Ranking components by the saving per unit can produce the wrong answer. The relevant measure is the saving generated by each unit of the scarce resource—for example, the saving per skilled-labour hour.
Use a three-step calculation:
- Calculate the relevant saving from making one unit internally: supplier price minus the relevant cost of internal production.
- Identify how much of the constrained resource one unit consumes.
- Divide the saving per unit by the resource requirement to obtain the saving per unit of the limiting factor.
Rank the components by that final figure and allocate the scarce resource from highest to lowest, subject to operational and strategic considerations.
The objective is not to maximise the saving on each unit. It is to maximise the return earned from the resource the business has least of.
This principle applies well beyond manufacturing. A consultancy may rank projects by contribution per specialist hour; a delivery business may examine contribution per vehicle-day; and a retailer may assess contribution per metre of shelf space.
From Reporting the Numbers to Managing Them
Management accounting is not simply a more detailed form of bookkeeping. It is a framework for choosing between alternatives. It shows why a loss-making product may still add value, why reported profit can change with inventory levels, and why scarce resources should be directed toward the highest return per unit of constraint.
The broader lesson is to look past allocated figures and ask what will actually change. Which cash flows are avoidable? What value is being deferred in inventory? What is the real bottleneck? Those questions turn accounting information from a record of the past into a tool for shaping the future.
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