Amazon's AI Spending Is Squeezing Cash Flow. Big Tech Faces a Costly Reckoning

Big Tech's AI ambitions are starting to cost more than its cash flow can support. For years, strong earnings allowed cloud companies to finance their expansion without much outside help.

Now, data center spending is growing faster than the cash coming in, pushing even the biggest names toward debt markets. Investors are taking a closer look at which companies can turn those investments into actual returns.

Amazon's growth comes at a cost

AmazonAMZN reported 39% growth in Amazon Web Services revenue to roughly $46B, its fastest pace in nearly five years. The cloud division generated $17.8B in operating income, helping companywide operating income climb to $28.1B from $17.4B a year earlier.

CEO Andy Jassy expects AWS revenue growth to exceed 40% in both 2027 and 2028. However, the expansion has come with a sharp increase in infrastructure costs, with property and equipment purchases rising by $94.8B.

Amazon's trailing 12-month free cash flow swung to a $42.4B outflow from a $14.8B inflow a year earlier. The company is generating more operating profit, but spending on data centers and equipment is absorbing more cash than its operations produce.

That leaves investors waiting for an indication of when those investments will begin improving cash flow.

Investors are getting more selective

AlphabetGOOGL showed how quickly sentiment can turn when spending outpaces expectations. Google Cloud revenue surged 103% to $30.71B, but earnings of $2.12 per share missed Wall Street's $2.97 estimate. Management also signaled another substantial increase in capital spending for 2027 without offering comparable revenue guidance.

MicrosoftMSFT reported 48% Azure growth and faced a more measured reaction, while OracleORCL gave investors a specific financial target by forecasting more than $30B in annual free cash flow by fiscal 2029.

The contrast is becoming more important as AI spending increases. Revenue growth still matters, but investors also want to see how quickly that growth can cover the cost of expanding capacity.

Amazon has provided strong demand forecasts, although it has yet to establish a timeline for its free cash flow to recover.

Borrowing fills the funding gap

Microsoft is reportedly planning a bond sale of at least $25B, its first since 2017, as it prepares to spend roughly $170B during calendar 2027. CFO Amy Hood has pointed to capacity shortages as a reason for continued investment.

The borrowing extends across the industry. Amazon, Alphabet, Meta PlatformsMETA, and Oracle issued approximately $194B in bonds through early July, a 79% increase from a year earlier.

Alphabet has also accumulated up to $1.08T in future purchase, lease, and other commitments. Quarterly capital spending reached $51.4B, while free cash flow fell to negative $9.07B.

Morgan Stanley and JPMorgan analysts estimate the sector could issue as much as $1.5T in new debt. Borrowing allows companies to continue building capacity, but interest expenses and repayment obligations could become harder to manage if demand grows more slowly than expected.

Which companies are better positioned?

Amazon has one of the stronger demand outlooks, with AWS carrying a $496B backlog and management forecasting further growth. It also maintained its 2026 capital spending forecast at roughly $220B, although the free cash flow deficit remains a concern.

Microsoft has taken a more measured approach, reducing its annual spending forecast to $170B from $175B while reporting strong Azure growth. Oracle's fiscal 2029 free cash flow target provides a clearer benchmark, though the company still needs to deliver on it.

Alphabet faces greater uncertainty. Its cloud business is expanding rapidly, but rising financial commitments and weaker-than-expected earnings make it harder to judge when that growth will translate into stronger cash generation.

The next earnings reports will be judged as much on cash flow as cloud growth. With borrowing and spending commitments climbing, companies that can show a credible path to recovering their investments have a stronger case than those asking shareholders to keep waiting.