Amazon is generating more cash. It’s spending even faster.

Amazon generated more cash from its operations over the past year. Yet its free cash flow turned negative. The difference is what it spent on property and equipment.

That can be a sensible choice for a growing company. It also means investors need to ask when the spending will produce cash they can keep, rather than assume rising earnings already answer that question.

This live chart does not plot capital spending or free cash flow. Its historical earnings use EPS multiplied by today’s share count, and its dashed section contains analyst estimates. Use the dated cash-flow table below to check what an earnings-based valuation leaves out; newer chart data may cover different periods.

More cash came in. Even more went into equipment.

Operating cash flow rose by $37.609 billion. Net equipment spending rose by $94.754 billion. Subtract the second change from the first, and free cash flow fell by $57.145 billion. Amazon attributes the spending increase primarily to AI investment in its results release.

The spending gap is real. Whether it is worthwhile depends on what the new assets earn over their lives. A negative number today cannot settle that question in either direction.

A server is paid for before it has finished working

Suppose a company pays $100 for equipment expected to last five years. In a simplified example with no residual value, it records $20 of depreciation each year: the accounting expense that spreads the equipment’s cost over its useful life. But the $100 cash payment happens when it buys the equipment. These are made-up figures, not Amazon’s asset values.

That timing explains why profit and cash left after investment can diverge. Amazon’s annual report describes straight-line depreciation over estimated useful lives. The estimates matter: equipment that becomes obsolete sooner can cost more to replace than an optimistic forecast allows.

Operating cash flow also differs from profit. As the SEC’s accounting guide explains, it adjusts for noncash expenses and changes in operating assets and liabilities. Customers paying earlier, inventory building up, or suppliers being paid later can change cash flow without an equivalent change in that period’s profit.

Don’t add every investment dollar back to profit

An optimistic forecast might label most spending “growth investment” and assume it will disappear once demand catches up. Some projects may indeed be temporary expansions. Others may need recurring replacement simply to maintain service and stay competitive. The cash-flow table alone cannot separate them.

Before removing spending from a forecast, identify the actual projects that would finish and the costs that would remain. Then ask whether slower investment would also mean slower sales. Holding revenue growth constant while cutting the assets needed to deliver it makes the forecast look better without making the business better.

Also keep the definition consistent. Amazon’s free cash flow subtracts net cash purchases of property and equipment from operating cash flow. Its annual report cautions that this measure excludes debt-principal payments and acquisitions. Buying equipment with financing rather than cash can change the measure without eliminating the obligation. It is not a complete account of money available for shareholders.

Give the investment a deadline and a return

For an investment case, write down when new capacity starts earning, how much cash it brings in after operating costs, and what upkeep or replacement it needs. Try a slower ramp-up as well as the one you expect. A project can eventually succeed and still offer a poor return if it costs too much or takes too long.

At the next earnings release, compare operating cash flow and net equipment spending over matching periods. Then look for evidence that the completed capacity is earning enough to support the forecast. One improving quarter is useful evidence, but not proof that every project will pay off.

Use Amazon’s earnings chart to examine the earnings assumptions behind the share price, and keep a separate cash-investment forecast beside it. For the other part of the return calculation, see how the price paid for earnings changes your return.