Tesla Capex Doubles to $4.7B as Operating Income Falls 56%

Tesla spent $4.73 billion on capital expenditures in the third quarter of 2026, 2.1 times the $2.25 billion of a year earlier (our arithmetic), while its income from operations fell 56% to $718 million, the company said in its Q3 2026 Update on 21 October 2026. Tesla lists the first cause of the profit decline as an “increase in operating expenses driven by SI and other R&D projects, SBC (including 2025 CEO Performance Award) and SG&A.”

SI is Tesla’s shorthand for what the Update calls “Super Intelligence (SI)”, its AI work across cars and robots. Revenue was $28.05 billion, roughly flat from a year earlier, and the operating margin was 2.6%, against 5.8%. Free cash flow was $1.53 billion, down 62%, after negative $1.09 billion in the second quarter.

Business Pill · CAPEX AND DEPRECIATION

A short explainer on capex and depreciation: how money spent on long-lived assets such as data centres turns into a cost over years. It teaches the general idea only and says nothing about Tesla’s results.

Tesla Q3 2026 explained · video

The quarter in about a minute and a half, from our published pieces (21 Oct 2026).

What Tesla Reported

Total revenues were $28,046 million, against $28,095 million in the third quarter of 2025. Automotive revenues were $20.56 billion, down 3%. Energy generation and storage revenue fell 16% to $2.88 billion, which Tesla says was partially due to tariff-related customer refunds. Services and other revenue rose 33% to $4.61 billion.

Gross profit rose 9% to $5.49 billion, a 19.6% gross margin. Operating expenses rose 39% to $4.78 billion. Within them, research and development was $2,761 million, against $1,630 million a year earlier, about 69% more (our arithmetic).

GAAP net income attributable to common stockholders fell 43% to $787 million, or $0.22 a diluted share. On Tesla’s non-GAAP measure it was $1.70 billion, or $0.48 a share. Deliveries were 486,532 vehicles, down 2%, and production was 464,391.

Where the Cash Went

Cash from operating activities was $6.26 billion, flat from a year earlier. After $4.73 billion of capital expenditures, free cash flow was $1.53 billion, against $3.99 billion a year earlier. Capital expenditures over the trailing twelve months reached $15.41 billion, according to the Update.

Spending fell from the second quarter, when capital expenditures were $5.79 billion and free cash flow was negative $1.09 billion. Cash, cash equivalents and short-term investments rose $1.9 billion to $45.45 billion. Tesla says: “We continue to invest in the future through R&D and Capex spend across our businesses, including SI, robotics and energy.”

In plain terms, capital expenditures are the money spent on long-lived assets such as factories, data centres and computers; free cash flow is the operating cash left after that spending.

The AI Build, Line by Line

Compute: the Update lists Cortex 1 at more than 105 MW and Cortex 2 at more than 120 MW of training compute in Texas, and says: “We plan to reach 400 MW of SI training compute by the end of the year.”

Robotaxi: Tesla says it reached “nearly two million cumulative unsupervised miles” for its Robotaxi service by the end of the quarter, and began giving rides in Cybercabs in Austin on 3 September.

FSD: active FSD subscriptions were 1.74 million, up 67%, and Tesla reports an attach rate above 75% of new deliveries in North America.

Energy and robots: storage deployed was 13.7 GWh, up 10%; Megafactory Texas began production, with 50 GWh of planned capacity. Tesla says Optimus production began on its high-volume lines in Fremont.

SpaceX: Tesla booked a $142 million unrealized loss on its SpaceX equity investment in the quarter, after a $1,005 million gain in the second quarter; it bought $2,002 million of SpaceX equity in the first quarter. The Update does not mention a Tesla–SpaceX merger.

The Outlook

The Update gives no numerical guidance for deliveries or capital expenditures. Tesla says that, over time, it expects its hardware-related profits to be joined by faster growth in SI, software and fleet-based profits, and that capacity build-out for its multi-year infrastructure projects, including SI compute and semiconductor manufacturing, is under way. It says it continued construction of an Austin chip fab, where it plans to start commissioning equipment in 2027.

On cars, Tesla says “battery availability continued to be the limiting factor in increasing auto volumes in the quarter,” and that it ended the quarter with its largest passenger-vehicle backlog in four years.

Update, 21 October: What Musk Said on the Call

On the earnings call, Musk said he expects Optimus to reach a run rate of 20,000 units a week in a year or “maybe a little longer,” and that “we still have a lot to get through” with manufacturing, Axios reported. Our separate piece covers the target in full (our Optimus target piece).

Musk said Tesla is aiming for production capacity of 5 million vehicles a year by 2030, according to Axios. On a possible merger with SpaceX, he said: “I think i said everything that should be said yesterday,” per Axios, referring back to his remarks on SpaceX’s call.

Axios also compared the quarter with analysts’ expectations: the $4.7 billion of capital expenditures was “still far below S&P Capital IQ expectations of $7.8 billion,” revenue missed expectations of $28.2 billion and net income trailed expectations of $925 million. Tesla shares rose 1.7% in after-hours trading, Axios reported.

According to our recording of the call, Musk also said the Cybercab fleet in Austin has grown by a factor of 10 since launch about a month ago, and that Tesla aims to make a first test chip at its Austin research fab around May or June and a useful chip at volume around the third quarter of 2028. A timestamped clip of the call posted on X by cb_doge labels those segments “Cybercab Austin fleet 10x” and “Useful chips volume Q3 2028.” These points are paraphrased from the recording, not quoted.

Tesla also cut its spending plan on the call. Chief financial officer Vaibhav Taneja said: “We’re revising our CapEx guidance to be approximately 20 billion for the current year as a result of managing our capital deployment efficiently and plan to fund it primarily from our cash flows from operations”, according to a Benzinga transcript. Yahoo Finance reported the change as $20 billion from $25 billion previously.

Connecting the Coverage

A day earlier, on 20 October, SpaceX reported its third quarter; CNBC reported from the call that SpaceX is on track to bring 200,000 Nvidia Grace Blackwell systems online a month for the rest of 2026 (our SpaceX call piece).

On the same call, Elon Musk said SpaceX and Tesla have formed special committees of independent directors to discuss a potential merger and that they have not agreed terms, Axios and The Verge reported (our merger piece). Tesla’s Update does not address it.

Bloomberg wrote on 21 October that a tie-up “could add more than $110 billion to his fortune by accelerating the vesting of Tesla shares that otherwise wouldn’t vest until 2028.” That is Bloomberg’s calculation; no deal has been agreed.

On 19 October, Tesla’s proxy statement listed “1 million bots delivered” among the milestones in Musk’s 2025 pay award (our Optimus piece). And on 21 October Nvidia said Bolt picked its driving software for a planned European rollout of at least 25,000 Lucid robotaxis, a rival robotaxi plan (our Bolt piece).

The Structural Read

As we read it, the cost of Tesla’s AI work shows up in two lines of its own tables: capital expenditures of $4.73 billion against $2.25 billion a year earlier, and research and development of $2,761 million against $1,630 million.

As we read it, the car and energy businesses did not grow enough to cover that: revenue was roughly flat at $28.05 billion, with automotive down 3% and energy generation and storage down 16%, while services and other rose 33%.

As we read it, the Update ties the spending to a compute target rather than a dollar figure: Tesla says it plans to reach 400 MW of SI training compute by the end of the year, and gives no numerical capital expenditures guidance. On the call, the company cut its 2026 guidance to about $20 billion (see the call Update below).

Three Implications

FOR TESLA SHAREHOLDERS As we read it, the quarter shows a company funding its AI build from operating cash: $6.26 billion of operating cash flow covered $4.73 billion of capital expenditures, leaving $1.53 billion of free cash flow, down 62%.

FOR AI SUPPLIERS Tesla lists Cortex 1 at more than 105 MW and Cortex 2 at more than 120 MW, and says it plans 400 MW of SI training compute by year end; as we read it, that is the demand signal in this Update for chip, power and cooling suppliers.

FOR ROBOTAXI RIVALS Tesla reports nearly two million cumulative unsupervised Robotaxi miles and Cybercab rides in Austin since 3 September; Bolt, separately, plans at least 25,000 Lucid robotaxis on Nvidia software in Europe.

The Business Engineer Lens

This story maps onto the Business Engineer framework The AI Capex Map & The State of AI Hyperscalers.

The framework’s sizing of the cycle: “The total cycle: $725B Big Four + $50B Oracle + $13B Apple + $60B Neoclouds + $80B China + $60B Sovereigns + $48B Other = ~$1.04 trillion in 2026 compute capex.”

As we read it, Tesla sits outside the framework’s “Big Four” line, in the “Other” spenders building their own compute: its $4.73 billion of quarterly capital expenditures covers factories as well as SI compute, and the Update does not split them. The framework was published in May 2026 and does not discuss this Update.

What Is Not Established

The Update does not break out how much of the $4.73 billion of capital expenditures went to AI compute, or how much of the research and development increase is SI work. The 2.1 times and 69% figures are our arithmetic from Tesla’s own tables. Musk’s comments from the earnings call are in the Update above, from Axios’s report and our recording of the call.

We read the Update in full; the Form 8-K was not yet on the SEC’s EDGAR system when this was written. We did not contact Tesla.

The Bottom Line

Tesla’s capital expenditures were $4.73 billion in the third quarter of 2026, 2.1 times a year earlier (our arithmetic), and income from operations fell 56% to $718 million, with Tesla citing higher operating expenses driven by SI and other R&D projects. Revenue was roughly flat at $28.05 billion and free cash flow was $1.53 billion, as Tesla says it plans to reach 400 MW of SI training compute by the end of the year.