The gap this fills
Return on equity has a known weakness: borrowing shrinks equity and inflates the result. Return on invested capital was designed to close that door. It counts everything funding the business, owner capital and borrowed capital together, and asks what the whole pile earns.
The intuition is straightforward. If a business is handed $500 million from any source and produces $75 million of operating profit after tax, it earned 15% on the capital entrusted to it. Where that capital came from does not change how well it was used, and this measure refuses to pretend otherwise.
Microsoft, worked through
Take operating profit after tax of roughly $88 billion, against invested capital of about $290 billion once shareholder equity and borrowings are added together. Divide 88 by 290, multiply by 100, and the result is approximately 30%.
A figure near 30% is genuinely rare. It says that every dollar committed to the business, borrowed or owned, produced about thirty cents of operating profit in a year. Sustained over a decade, that is the signature of a company with something competitors cannot easily copy.
Rounded approximations, shown to make the arithmetic followable.
Why acquisitions cloud the picture
The main distortion here is not borrowing but buying. When one company acquires another above the value of its physical assets, the excess is recorded as goodwill, and goodwill sits inside invested capital.
A serial acquirer therefore carries a large capital base whether or not those purchases worked out. Its return on invested capital looks weak even when the underlying operations are strong. Some analysts strip goodwill out to see the operating business more clearly, which flatters acquirers instead, so it is worth knowing which version you are reading.
The practical response is to look at the trend. A company whose return on invested capital falls year after year following a run of acquisitions is telling you those purchases are not earning their price.
The threshold that matters more than any range
There is one comparison worth making above all others: is the return higher than the cost of the capital itself? A company earning 9% on capital that costs it 11% to raise destroys value with every expansion, no matter how impressive the growth headlines look.
As rough orientation, software and payments businesses often clear 20%, established consumer companies commonly sit between 12% and 20%, and capital-heavy industries such as utilities and airlines frequently run in single digits by nature. Judge each against its own sector and its own past.
Using it inside Stax
This measure works best as a quality gate rather than a ranking tool. Ask for companies clearing a sensible bar for their industry, then let other rules decide what your plan does with them and when.
Because it resists the borrowing distortion, it is a strong filter to pair with a debt limit when you want durable businesses rather than temporarily flattering ones. Build the plan, then let Stax replay it across five or more years of real market prices before you commit anything, real or simulated.