Google just maxed out the AI credit card

Alphabet just posted the biggest quarter in its history, and its stock fell about 10% after hours. Revenue rose 25% to $127.6 billion, and Google Cloud more than doubled.

The market wasn’t reacting to a bad business. It was reacting to a bill. Alphabet now spends more than $50 billion a quarter on AI infrastructure, and that spending isn’t yet showing up as better margins. It is showing up as higher costs, weaker cash flow and a fast-growing pile of debt.

The margin went backwards, not forwards

On paper, operating margin improved from 30.5% to 31.8%. That comparison is flattered: last year’s quarter carried a one-off $3.5 billion European Commission fine, which Alphabet itself excluded to report a 33.9% underlying margin.

Compare like with like and the picture flips. Underlying operating margin fell from 33.9% to 31.8%. Operating income grew 17% to $40.6 billion, well behind revenue. Google Services, the Search and YouTube money machine, earned only about 6% more on 11% more revenue, and its margin slipped from 42.5% to 40.7%.

Year-over-year growth, July to September 2026. 2025 profit figures exclude the $3.5 billion EC fine.

Show the numbers

	Growth
Revenue	25%
Operating income	17%
Google Services operating income	6%

Source: Alphabet Q3 2025 and Q3 2026 earnings releases

Where the money goes

Every cost tied to the AI build-out is growing faster than sales. Capital spending more than doubled to $51.4 billion, about 40% of revenue. Interest expense rose about sevenfold to nearly $1 billion as debt piled up.

Year-over-year growth, July to September 2026

Show the numbers

	Growth
Capital spending	114%
Alphabet-level costs (mostly AI research)	71%
Depreciation	49%
Research and development	36%
Revenue	25%

Source: Alphabet Q3 2026 earnings release

Spending on that scale doesn’t hit profits all at once. It arrives slowly, as depreciation, for years. Net property and equipment rose from $247 billion in December to $373 billion in September. Much of it is servers and data centers that will add to depreciation as they come into service, whether or not the AI demand behind them holds up.

The miss survives the investment loss

Reported earnings per share were $2.12, against a consensus of about $3.02. The easy explanation is an $8.7 billion loss on Alphabet’s stakes in other companies, which Alphabet says cut EPS by $0.55. That loss is mostly noise: Alphabet booked about $136 billion of gains on its securities in the first half of the year, and these values swing every quarter.

Add the $0.55 back and EPS is $2.67, the adjusted figure Reuters compared with the $3.02 consensus. That is still about 12% short, and operating income confirms it: $40.6 billion against about $43.2 billion expected.

• Operating pressure: core advertising revenue of $82.0 billion came in about $1.4 billion below estimates, while depreciation and AI research costs kept climbing.
• Financing and share count: interest expense rose about sevenfold, new preferred stock cost $298 million in dividends, and diluted shares rose 1.4%.

Google Cloud beat expectations. The shortfall came from the core ad business and the cost of the build-out, not from the investment portfolio.

Alphabet now borrows to build

Free cash flow was −$9.1 billion, the second negative quarter in a row, against analyst expectations of roughly break-even. Capital spending of $51.4 billion exceeded the $42.3 billion the business generated from operations.

Billions of dollars per quarter

• Operating cash flow
• Capital spending

Show the numbers

	Operating cash flow	Capital spending
Q4 2025	$52.4bn	$27.9bn
Q1 2026	$45.8bn	$35.7bn
Q2 2026	$39.1bn	$44.9bn
Q3 2026	$42.3bn	$51.4bn

Source: Alphabet Q3 2026 earnings release, free cash flow reconciliation

Operating cash flow itself fell 13% from a year ago, from $48.4 billion to $42.3 billion, while revenue grew 25%. Part of that is working capital: inventory jumped to $13.3 billion as Alphabet builds TPU systems to sell.

Alphabet has also shifted from returning cash to raising it:

• No share buybacks this quarter, against $11.5 billion a year earlier.
• $28.7 billion of new bonds. Long-term debt is up from $46.5 billion to $125.1 billion since December.
• $12.4 billion from selling new shares through its at-the-market program, which Alphabet says is mainly to cover about $30 billion of 2026 tax bills on vesting employee stock awards.
• An $80 billion equity program announced in June, including $10 billion from Berkshire Hathaway. The part outside the at-the-market program is earmarked for general purposes, including AI infrastructure.

This isn’t a liquidity crisis. Alphabet ended the quarter with $265.1 billion of cash and marketable securities, and free cash flow over the past 12 months is still positive at $19.7 billion. But a company that spent years shrinking its share count is now issuing shares and borrowing heavily to keep building.

The bull case, and why it isn’t enough yet

The spending is clearly buying something. Google Cloud revenue rose 103% to $30.7 billion, its operating margin jumped from 23.7% to 36.2%, and its profit reached $11.1 billion, both ahead of analyst estimates. Alphabet also says Search query growth is the fastest in five years, and the Gemini app has passed one billion users.

• Some of Cloud’s growth is hardware: Alphabet says sales of its TPU systems were a meaningful contributor. Hardware sales are lumpier than recurring cloud subscriptions.
• The return can’t be measured yet: the capital spending serves Search, YouTube, Cloud and AI research, and the assets last for years. The test is whether company-wide margins and cash flow rise as the new capacity comes online.

Cloud is the proof that AI demand is real. It isn’t yet the proof that the returns cover the cost.

What to watch

• The 2027 spending plan: the 2026 guide of $195 billion to $205 billion stands, and management has said 2027 will be significantly higher.
• Google Services margin: if the core business keeps losing margin, AI costs are eating into the profit engine.
• Depreciation: it grew 49% in a year, and net property and equipment is up $126 billion since December.
• Free cash flow and dilution: a return to positive free cash flow without more share sales would change the story.

Alphabet isn’t broken. It is buying growth with margin. Until the spending shows up as rising margins rather than rising costs, the market is likely to keep judging Alphabet on the quality of its earnings, not the speed of its revenue growth.