Tesla's Q3 profit fell 43% as AI and Optimus spending climbed

Tesla brought in $28.05 billion in revenue, about the same as the $28.1 billion of Q3 2025. Here is how the quarter looks next to the one before and the one a year ago, using Tesla's figures as laid out by Electrek:

On Tesla's preferred non-GAAP measure, earnings were $0.48 per share. Electrek says that beat the $0.45 analysts expected but is 4% below the $0.50 of a year ago.

The big picture: this was a better quarter than Q2, when the operating margin was 1.4%. It is still a worse one than Q3 2025.

Revenue was flat overall, but the pieces moved in different directions:

• Automotive: $20.6 billion, down 3% from a year ago, Ars Technica reports.
• Energy generation and storage: $2.88 billion, down 16%. Tesla partly blames tariff-related customer refunds, even though it deployed 13.7 GWh of storage, up about 10% from a year earlier.
• Services and other: $4.61 billion, up 33%. Tesla says gross profit here hit a record $734 million, from charging, insurance and parts, Electrek reports.

Tesla delivered 486,532 cars in the quarter, as we covered when the delivery numbers came out. Deliveries were down 2% from last year, and Tesla says battery availability was the limiting factor.

It also says it ended the quarter with the largest backlog for its passenger vehicles in four years.

Gross profit actually improved. Total gross margin was 19.6%, up from 18.0% a year ago, and automotive margin without regulatory credits rose to 18.1% from 15.4%. Tesla credits a better mix of regions and products and more subscription revenue from its Full Self-Driving software, partly offset by lower average selling prices.

The squeeze came further down the page. Operating expenses rose 39% to $4.78 billion:

• Research and development: $2.76 billion, up 69%. Tesla points to what it now calls "SI" (its AI work), Optimus and the Cybercab.
• Sales and administrative costs: $2.02 billion.
• Stock-based pay: $1.17 billion, up from $663 million a year ago, which includes the 2025 CEO pay package, Electrek reports.

Why it matters: spending on future products grew faster than the profit on today's cars. That is how a company can improve its margins and still earn 56% less operating income.

For years, Tesla earned money by selling emissions credits to other carmakers. That income is fading fast. It was $113 million this quarter, down from $417 million in Q3 2025 and $146 million in Q2.

Ars Technica explains why: nearly every other automaker now sells its own electric vehicles, so it no longer needs to buy credits from Tesla. Electrek adds that the credit line is not expected to come back, because carmakers no longer pay federal fuel-economy penalties.

Tesla's own filing says the drop weighed on operating income compared with last year.

Capital spending was $4.73 billion, more than double the $2.25 billion of a year ago. Ars Technica puts the rise at 110%. Free cash flow was still positive at $1.53 billion, and cash and investments ended the quarter at $45.4 billion.

The full-year plan is less clear. Electrek notes that Tesla has spent $13.01 billion in nine months against earlier guidance of more than $25 billion, and that the shareholder letter did not update that figure.

Yahoo Finance reports that on the earnings call Tesla lowered its full-year capex guidance to $20 billion. It quotes CFO Vaibhav Taneja saying the company plans to fund spending mainly from operating cash flow.

According to Yahoo Finance, the money is going to Optimus production lines, AI computing, the Cybercab ramp and a chip plant Tesla is building with SpaceX.

Tesla says Optimus has begun production on high-volume lines in Fremont. In its release it says the company has "proven that the current manufacturing process for Optimus is suitable for a commercial product," while it keeps improving the hardware.

Yahoo Finance reports that Elon Musk said reaching 1 million units a year, or 20,000 a week, would take "at least a year, maybe a little longer."

On self-driving, Tesla reports:

• Robotaxi miles: cumulative unsupervised miles grew eightfold from the previous quarter, to nearly 2 million.
• Cybercab: it joined the Austin Robotaxi fleet on September 3.
• FSD subscriptions: 1.74 million active, up from 1.48 million in Q2.
• AI computing: Tesla targets 400 MW of training compute by the end of the year.

Tesla stresses that FSD requires active driver supervision and does not make a car autonomous.

In real life If you own a Tesla, the number that touches you most is the subscription count. Tesla earns money from FSD every month it stays on, which is the kind of income the company says it wants more of.

A few smaller items explain why the GAAP profit and the adjusted profit look so different.

• Bitcoin: GAAP net income included a $288 million unrealized gain on Tesla's bitcoin holdings, Electrek reports.
• SpaceX: it also included a $142 million unrealized loss on Tesla's equity investment in SpaceX.
• Inventory: Tesla delivered 22,141 more cars than it built, which cut its inventory to 11 days of supply from 15 in Q2, Electrek reports.
• Prices: average selling prices fell again, which Tesla lists as one reason revenue stayed flat.
• Europe: Tesla says FSD is now approved in nine EU countries, after Croatia, Slovenia, the Czech Republic and Slovakia were added since Q2.

Wall Street expected a flat quarter. Electrek says analysts looked for about $28.06 billion in revenue, so the top line landed almost exactly where forecasts were.

The surprise was on the cost side: capital spending came in well below what analysts predicted, according to Yahoo Finance, which helped free cash flow stay positive.

Tesla also says it has started volume production of the Semi at its Nevada plant and unveiled an updated version on October 15. The company quotes a 500-mile range at full weight.

In energy, Tesla reports its highest-ever order rate and backlog for Megapack. Its Texas Megafactory has begun production, and the first Megapacks with Nevada-made cells have shipped.

The energy segment's gross margin rose to 33%, but Electrek notes that gross profit of $954 million is below the $1.07 billion of a year ago.

• If you own Tesla stock: profit is down while spending on new products is up. Tesla says it expects hardware profits to be joined over time by software and fleet-based profits.
• If you're shopping for a Tesla: Tesla says it has the largest backlog in four years and that battery supply, not demand, is holding back volume.
• If you follow robots: Optimus production has started, but Tesla says it will keep refining the design.
• If you're curious about FSD: subscriptions are up 67%, and the software still needs a driver paying attention.