Microsoft floats record US$25b bond sale for AI buildout

The bond sale is Microsoft's first major issuance in nearly a decade, and the company framed it as long-term funding for AI infrastructure and cloud platforms. That timing matters because Microsoft is already planning US$170b to US$190b in calendar 2026 capex. Using debt rather than drawing down current cash lets the company spread the cost of data centers and cloud hardware over time, which can preserve flexibility for dividends, buybacks, or acquisitions.

The structure of the deal adds senior, unsecured liabilities across maturities from 2 to 40 years, so total debt rises but repayment is staggered. With a AAA rating and strong earnings, interest costs are supported, though investors may still want to watch leverage metrics such as net debt to free cash flow as AI spending continues. A checkpoint is how free cash flow and Microsoft Cloud margins trend over the next four quarters as the US$25b is deployed; if Azure and AI-related revenue supports operating margin near current levels while net debt to free cash flow remains contained, that would suggest the AI capex is being absorbed without undue balance-sheet pressure. Separately, the expanded Estée Lauder collaboration points to Microsoft pushing AI partnerships beyond its own cloud stack into global consumer brands.