AWS earned $17.8 billion. Who paid for the servers?

NOVEMBER 2, 2026 · THE WEEKDAY BRIEF

Good morning. Amazon earned $17.8 billion in operating income at AWS in the September quarter. Across Amazon as a whole, the last twelve months produced a $42.4 billion free cash outflow. A server can help explain how both figures can be true. Its supplier gets paid long before the last customer rents time on it.

Inside today’s brief: the gap between Amazon’s earnings and cash, Microsoft’s equipment bill, and the research costs that sit outside Google Cloud’s accounts.

Illustrative data center photograph · Brett Sayles / Pexels

Amazon’s October 29 earnings release puts the cash movements on the same clock. Over the twelve months through September, its businesses generated $168.3 billion in operating cash. Purchases of property and equipment, after sales proceeds and incentives, absorbed $210.7 billion. A year earlier, operating cash covered those purchases with $14.8 billion to spare. Amazon attributes most of the increase in equipment spending to AI investment.

Where Amazon’s operating cash went

Companywide, twelve months ended September 30 · US$ billions

Source: Amazon quarterly results. Figures rounded.

A server bought for cash shows up immediately in the cash calculation. On the income statement, its cost is spread over its useful life. A provider can therefore report growing operating profit from equipment already in service while writing much larger checks for the next generation. Amazon reports these cash figures for the whole company. Its warehouses, stores and delivery network share that ledger with AWS.

The optimistic reading is that Amazon is buying capacity ahead of customers who will pay to use it. AWS sales grew 39.3% from a year earlier. The competing reading is that customers will buy plenty of compute, but at prices too low to recover the cost of replacing the equipment. Watch whether operating cash begins to catch up with net equipment purchases as new sites enter service. AWS sales growth alone cannot settle that question.

Amazon’s third-quarter results

Microsoft’s two-story AI data center in Atlanta · Microsoft

Microsoft spent $39.4 billion in cash on property and equipment in the September quarter, up from $19.4 billion a year earlier. Those are companywide figures. If a customer signs today for computing capacity that opens next year, the signature can help justify construction. It still leaves somebody funding the interval between the equipment purchase and the customer’s payment.

For a buyer negotiating reserved capacity, the useful contract question is who carries the delay. Does billing start on a calendar date, or only when the promised machines are available for the workload?

Microsoft’s quarterly cash flow statement

Where Google counts the research bill

Cooling pipes at Google’s New Albany data center in Ohio · Google

Google Cloud earned $11.1 billion in operating income on $30.7 billion in September-quarter revenue. Alphabet also recorded $7.7 billion of expenses at the parent level, primarily for shared AI research and development. A model built once can serve both a cloud customer and a search user. Assigning the entire research bill to either business would give a misleading picture of its economics. Compare Cloud’s progress with Alphabet’s consolidated result before deciding how much of the benefit reached shareholders.

Alphabet’s quarterly filing

What changed? Amazon paid for equipment faster than its operations generated cash.

What was measured? $42.4 billion of companywide free cash outflow over twelve months.

What still costs money? Power, maintenance and replacement once servers enter service.

Who captures the gain? Suppliers collect at purchase. The operator’s return depends on the rates customers pay and how many hours they buy.

When your team reserves compute, what happens to the bill if delivery slips? Hit reply and tell us.

— Machines and Money team