An ordinary person can earn a paycheque, pay her taxes, cover living costs and mortgage payments, and perhaps even add to her savings — and at the end of the day she will still owe most of her mortgage. This is a normal state of affairs, and nobody finds it puzzling. Yet when a company reports profits alongside large amounts of debt, the reaction is often to question whether it’s really making money. After all, if a company is “truly” profitable, why is it in debt?
The short answer is that debt is not the opposite of profit. Loss is the opposite of profit. This imagined contradiction is easier to resolve once we recognize that profit is a flow and debt is a stock. According to the SEC’s guide to financial statements, the income statement records revenues, expenses, and profit over a period, while the balance sheet records assets and liabilities — such as debt — at a point in time.
In fact, debt and profit are entirely unrelated concepts. Imagine a firm borrows money to purchase a machine. When the loan arrives, the firm’s cash and debt rise by the same amount. When the purchase is made, the firm simply exchanges one asset (cash) for another (the machine). Neither transaction creates a profit or a loss. Over time, the machine may be used in productive activities that raise revenue. By the same token, depreciation in the machine’s value can lower profit over its useful life, and interest — the cost of managing debt — adds to expenditures for as long as the debt is outstanding.
The best way to think about debt is as a contract that moves purchasing power across people and time. Savers give up control over their resources today, while borrowers promise principal and interest later in exchange for controlling those resources now.
Banks and bond markets pool and match funds from many people, letting a single firm undertake a factory, railway, or phone network without first accumulating the cash itself. As Frédéric Bastiat put it, credit institutions “can make it easier for borrowers and lenders to find one another and reach an understanding.” Adam Smith made a related point: what the borrower receives is “not the money, but the money’s worth, or the goods which it can purchase.” In effect, what debt does is rearrange the distribution of claims on real resources at a given point in time.
But if interest on debt and asset depreciation can eat into profits, why not simply pay for everything in cash? Because a business must control resources before it can use them to produce goods and services. If a supermarket doesn’t fill its shelves with products, there’s nothing for its customers to buy.
Firms also borrow to acquire other companies, bridge the wait for customers to pay invoices, keep cash on hand for a downturn, or avoid issuing new shares and diluting existing owners.
Verizon is a real-life case study of a company that has taken on large amounts of debt and managed it reasonably well. As of the end of 2025, the telecommunications giant carried $158.2 billion of debt. That year, it earned $17.6 billion after $6.7 billion in interest expense, while generating $37.1 billion in operating cash. Verizon spent $17 billion, largely on infrastructure that will serve customers for years to come — and it makes sense for those assets to be paid for over the years as well.
SpaceX and the companies building AI infrastructure offer further illustrations of the distinction between debt and profit. SpaceX’s $25 billion bond issue in June 2026 was largely used to refinance existing borrowing — the figure alone tells us little about profitability, or whether that level of debt is healthy.
AI infrastructure companies could prosper if demand keeps their equipment busy at prices that cover costs. On the other hand, competition may push prices down, while better chips may shorten the commercial life of existing equipment.
We should expect outcomes to vary considerably across firms. Growing demand can support successful businesses without making every investment worthwhile. What matters is whether customer payments eventually cover operating costs, replacement investment, and debt commitments.
None of this means debt is harmless. Interest payments can strain a company’s cash flow even when revenues are healthy. A company can, in theory, be profitable and still fail — if too much cash is tied up in assets, or when a large loan reaches maturity.
What debt describes is how a business is financed. Most profitable firms carry debt because they need to pool resources from lenders to begin or expand their ability to produce goods and services. What matters is what the debt was used for, and whether the company has enough cash flow to meet its commitments. Debt and profit are not, and have never been, opposites.
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