Two Divisions of the Same Company Argue Over One Internal Price
When one business unit sells to another inside the same company, someone has to set the price. That number moves profit between divisions and between countries, which is why tax authorities care about it.
The Problem
Large companies are not single units. They are collections of divisions, each with its own income statement and its own manager whose bonus depends on that income statement. When one division sells something to another, a price has to be attached to the transaction. That price is the transfer price.
At the consolidated level the transfer price is invisible. Revenue booked by the selling division cancels against cost booked by the buying division, and the parent reports the same total profit no matter what number was used. Internally it is anything but invisible.
A transfer price does not create profit. It decides who gets credit for the profit that already exists, and that determines behaviour.
Why the Number Causes Fights
Suppose a components division makes a part for 40 dollars and the assembly division sells the finished product for 100. There are 60 dollars of profit between them. Set the transfer price at 50 and the components division books 10 while assembly books 50. Set it at 85 and the split reverses.
Both managers are measured on divisional profit. Both have a direct financial interest in the number. Neither is being unreasonable by arguing for it.
| Transfer price | Components profit | Assembly profit | Total |
|---|---|---|---|
| 50 | 10 | 50 | 60 |
| 70 | 30 | 30 | 60 |
| 85 | 45 | 15 | 60 |
The Three Common Methods
Market price. If the part is sold externally, use the external price. This is the cleanest method because it is objective and it forces each division to be competitive against the outside world. It fails when there is no external market, which is common for specialised components.
Cost plus. Take the selling division cost and add a fixed markup. Simple to administer, but it rewards the selling division for having high costs, because a percentage markup on a bigger number is a bigger absolute profit.
Negotiated. Let the two managers agree. This produces prices that both sides accept, at the cost of consuming management time and producing outcomes that depend on who negotiates better rather than on economics.
When the Price Causes Bad Decisions
The real damage is not the argument. It is when the transfer price makes a division reject something good for the company.
Return to the example. If the transfer price is 85 and the assembly division can only sell the product for 90, assembly sees a 5 dollar margin and may decline the order as not worth the effort. The company as a whole would have made 50 dollars on it, since true incremental cost is 40. A number invented for internal reporting has just destroyed a profitable sale.
The textbook answer is that the transfer price should equal marginal cost when there is spare capacity, because marginal cost is the only number that reflects what the company actually gives up. Companies rarely do this, because a division selling at marginal cost reports no profit and its manager objects.
The Tax Dimension
The argument stops being purely internal the moment the two divisions sit in different countries. If the components division is in a low tax jurisdiction and assembly is in a high tax one, the parent has an obvious incentive to set a high transfer price, shifting profit toward the low tax entity.
Tax authorities understand this perfectly well. The governing principle in most jurisdictions is the arm length standard: the transfer price must approximate what unrelated parties would have agreed. Companies maintain transfer pricing documentation to defend their numbers, and disputes over them are among the largest tax cases that exist.
The internal accounting question and the international tax question are the same question, which is why finance teams cannot set the number on management convenience alone.
How Finance Teams Handle It
A common resolution is to run two sets of numbers. One transfer price satisfies the tax and statutory requirement. A separate internal measure, often based on marginal cost or on contribution rather than reported divisional profit, is used to evaluate managers and make decisions.
That is more work, and it requires the finance function to explain clearly why a manager is being judged on a number that does not appear in the statutory accounts. It also avoids the failure where a division declines profitable business because an internal price told it to.
The Bottom Line
Transfer pricing is a rare topic that is simultaneously a management accounting problem, a behavioural problem and an international tax problem. The consolidated profit does not change, but incentives, reported divisional performance and the tax bill all do. The practical test of a transfer pricing system is not whether it is fair to the divisions. It is whether a division ever turns down business that the company as a whole should want.