When AI Capital Spending Becomes a Credit Question

In the four quarters to June 2026, Alphabet, Amazon, Meta, Microsoft and Oracle spent 566 billion dollars on property and equipment. Their operations generated 692 billion over the same period. Two years earlier the same pair of numbers was 164 and 411: investment then absorbed 40 per cent of the cash the businesses produced, and it now absorbs 82 per cent.

Over those same two years the five moved from repaying about 27 billion dollars of debt a year, on net, to raising about 195 billion. Together those changes mark a financing transition: capital spending is absorbing far more internally generated cash just as net debt issuance has accelerated.

Section 01The funding gap that can be observed

Plant spending ultimately draws on cash from operations, cash already held, asset-sale proceeds or external capital. But capital expenditure minus operating cash flow is not a closed financing identity: dividends, buybacks, acquisitions and other investing flows also use cash, while disposals and working-capital movements affect what is available. The measured gap therefore describes pressure on internal cash generation, not a traced source of funds. As capital expenditure approaches operating cash flow, less internally generated cash remains for other uses and funding choices become more relevant.

The transition can therefore be dated, which is a narrower exercise than judging whether the investment is justified. What follows measures the transition at the five US-listed companies whose capital expenditure is dominated by data-centre and compute infrastructure and whose accounts are on one comparable basis. Nvidia is excluded: it sells the equipment rather than installing it, so its capital expenditure is a different object. The private builders are excluded because no comparable primary filing exists to read.

The filings do not identify AI capital expenditure separately. A cash flow statement records cash paid for property and equipment without breaking it down by purpose, so every figure below is total capital expenditure: at Amazon that includes fulfilment and transportation, and at all five it includes ordinary buildings. Attributing the increase to AI infrastructure follows the companies' own characterisation and the Bank of England's.

Section 02What the filings show

Figure 1 is built from as-filed XBRL facts. Cash-flow items are tagged year to date, so a fourth quarter never appears on its own; single quarters are recovered by differencing consecutive year-to-date facts, and reported quarters are used wherever they exist.

The lower panel is the measurement. Capital expenditure as a share of operating cash flow fell steadily through 2023, reaching 40 per cent in the four quarters to March 2024, and has risen in every quarter since to 82 per cent. The trough matters for reading the size of the move: at the start of the sample, in the year to September 2022, the ratio was 54 per cent, so 2024 was a low point rather than a normal level. The move is therefore from roughly one-half to roughly four-fifths, off a base that had itself been falling.

The rise is not the denominator giving way. Trailing four-quarter operating cash flow rose from 411 to 692 billion dollars over the two years, a gain of about two thirds. Trailing four-quarter capital expenditure rose from 164 to 566 billion, which is roughly three and a half times. The ratio moved because the numerator moved.

Nor is it one firm. Four of the five had a ratio in the thirties in the year to March 2024, and Amazon was at 54 per cent; at the latest reading Microsoft is at 63 per cent, Meta 69, Alphabet 71, Amazon 107 and Oracle 174. Removing Oracle, which is much the most extreme, leaves the aggregate at 77 per cent against 40 at the trough, so the result survives dropping the observation that drives it hardest.

Measured against revenue rather than cash flow, capital expenditure has gone from 12 per cent to 31 per cent of sales. A group of companies reinvesting close to a third of revenue in physical plant is a different kind of business from one reinvesting an eighth, whatever the plant is for.

Section 03From surplus to issuance

The left panel of Figure 2 puts two financing indicators on one axis. The internal surplus, defined here as operating cash flow minus capital expenditure and nothing else, peaked at 247 billion dollars in the four quarters to March 2024 and is now 126 billion. Net borrowing, proceeds minus repayments, was minus 27 billion in the year to June 2024 and is now plus 195 billion. Gross proceeds over the last four quarters were 250 billion.

The crossing of those lines is the empirical result: internal surplus fell as net debt issuance rose. The filings do not identify the use of debt proceeds. Cash is fungible, and these firms also pay dividends, repurchase shares, buy other assets and hold large securities portfolios, so nothing in the panel attributes a dollar of borrowing to a data centre rather than to any of them.

Borrowing is less standardised across the five filings than capital expenditure or operating cash flow. Each registrant tags its financing section differently: Alphabet reports proceeds net of issuance costs and includes commercial paper, Amazon separates short-term from long-term, Microsoft reports debt maturing in more than three months, and Oracle reports senior notes. The aggregate is therefore reliable in sign and in order of magnitude rather than to the dollar.

Section 04The stock, and what it is not

Flows have turned; the stock has not. Adding disclosed borrowings to finance-lease liabilities gives 577 billion dollars of interest-bearing obligations across the five at 30 June 2026, 0.83 times a single year of their operating cash flow. That total aggregates each registrant's own balance-sheet classification: current and non-current long-term debt at four of the five, notes payable at Oracle, and each firm's disclosed finance-lease liability, Meta's carried from its latest annual tag. Gross of cash and before any coverage test, the multiple is a scale marker rather than a leverage measure, and at this level it is not the profile of a group already under credit strain.

The aggregate conceals a distribution, and the distribution is where the interest lies. Alphabet is at 0.55 times operating cash flow, Microsoft 0.58, Meta 0.65 and Amazon 0.90. Oracle is at 4.29, roughly five times the group figure, and it is also the firm whose capital expenditure most exceeds the cash its operations generate. The panel establishes that the two facts coincide, not why.

The Bank of England reached a similar reading in its July 2026 Financial Stability Report, judging that at the start of 2026 the stock of outstanding debt from AI companies was relatively modest, and that this had helped contain the immediate risk to financial stability, while noting that the pace of activity in credit markets during the first half of 2026 was causing potential risks to build rapidly.

funding capacity, per period and per firm:

    cash available for capex  =  operating cash flow
                              +  reduction in cash and securities
                              +  proceeds of asset sales
                              +  net external capital raised
                              -  other cash uses

    capex minus operating cash flow is an indicator of pressure
    on that capacity, not a traced funding identity

measured, five firms, trailing four quarters, USD bn:

                        to Mar 2024     to Jun 2026
    capital expenditure          164             566
    operating cash flow          411             692
    capex / cash flow           39.8%           81.8%
    internal surplus             247             126
    net borrowing                -18             195

    interest-bearing obligations at 30 Jun 2026:  577 bn
    as a multiple of one year of cash flow:       0.83x

One firm shows why cash capital expenditure is a floor rather than a total. Microsoft added 24.6 billion dollars of right-of-use assets in exchange for finance-lease liabilities in the year to June 2026, against 115.9 billion of cash capital expenditure. That is roughly a fifth again of infrastructure obtained with no investing outflow at all, because the lessor financed the building. It shows up on the balance sheet: 62 per cent of Microsoft's interest-bearing obligations are finance leases, and its lease liability of 66.6 billion is larger than its 40.3 billion of borrowings. A reader following only the capital-expenditure line would miss both the asset and the obligation.

A cash flow statement records the spending of a company. It does not record the spending done on its behalf.

The panel captures what sits on five balance sheets and no more. The Bank of England's report describes capital being raised for the same build-out through securitised data-centre structures, special purpose vehicles and other bespoke arrangements, and reports the OECD's estimate that the share of private credit financing AI investment rose from 9 per cent in 2024 to 34 per cent in 2025. It also records that AI issuers accounted for 41 per cent of non-refinancing US high-yield issuance in the year to the report, against 1 per cent of the high-yield index at the end of 2025. None of that flow appears in Figure 1 or Figure 2. The measurement is therefore a partial view of a financing transition whose least disclosed part sits outside these five consolidated balance sheets.

Section 05What the arithmetic then requires

The right panel of Figure 2 takes the measured trailing four-quarter base, grows capital expenditure and operating cash flow at constant annual rates, and accumulates capital expenditure minus operating cash flow over eight quarters. The panel is a sensitivity map, not a forecast.

Over the last year capital expenditure at these five grew 81 per cent and operating cash flow 35 per cent. Repeating both rates for two years produces a cumulative gap of about 378 billion dollars between the two series. That gap could be met from existing cash, asset sales or external funding; shareholder distributions and other cash uses could enlarge it. Hold cash-flow growth at 10 per cent instead, and the gap becomes positive once capital expenditure growth rises above about 30 per cent. Because it is the difference between two large and separately growing quantities, assumptions that sound like small revisions move it by hundreds of billions.

The other variable the scenario holds fixed is time. Debt raised to build a data centre has a stated maturity; the equipment inside has a useful life set by the pace of hardware improvement, and the Bank of England's report notes mixed evidence on how quickly AI chips depreciate, with current shortages arguing for longer lives and rapid efficiency gains for shorter ones. Whether that becomes a maturity mismatch depends on the terms of individual debt agreements and on how the risk is allocated between lender, borrower and tenant, none of which is visible from consolidated filings.

Two things would change the reading, and both are observable in the same quarterly data. If capital expenditure growth decelerates towards the growth rate of operating cash flow, the ratio stabilises wherever it happens to be, and the financing question recedes without any debt being repaid. If cash generation disappoints while spending is already committed, the capex-to-cash-flow gap widens and management must choose among cash reserves, asset sales, reduced other uses or outside capital. What the last two years establish is that the group has used up the margin which made that choice unimportant.

This research is analysis and commentary for general information. It is not investment advice, an offer, or a solicitation, and it contains no price forecasts and no view on any security. Figures 1 and 2 are the author's own calculations from the primary filings cited; the right-hand panel of Figure 2 is a scenario under stated assumptions.