How Tesla Counts Its 1.74 Million Self-Driving Customers

Tesla reports that 1.74 million vehicles currently have an active Full Self-Driving subscription. This number is up 67 percent from the same time last year. While that sounds like strong growth, the way the company defines a subscriber is doing a lot of the heavy lifting. A footnote in the recent Q3 2026 shareholder letter clarifies the math. It states that the metric follows the 2025 CEO Performance Award. That means it includes both people paying a monthly fee and those who bought the software outright. This is significant because hitting 10 million active subscriptions is a key milestone for Elon Musk to earn his pay package.

The definition matters because it changes how we view the product. For years, Tesla sold this software as a one-time purchase. Some owners paid as much as $15,000 for it. Under the current reporting method, every one of those cars counts as an active subscription as long as the vehicle is active. The only ones excluded from this count are free trials. Tesla stopped selling the software as a one-time purchase in February 2026. Now, new customers in the U.S. can only get it as a $99 monthly subscription. However, everyone who paid upfront before that date remains in the total. This approach allows Tesla to claim a massive user base, even though hundreds of thousands of those users are not currently sending a monthly payment.

There is also a question of what is being delivered. Many of the people in this count were sold on the promise of unsupervised self-driving. Tesla has not yet delivered that capability to all of them. The company also uses similar logic for its delivery numbers. Its cumulative delivery figure is now 10.2 million. This count includes any unsupervised robotaxis placed into commercial operation. This aligns with another milestone in the pay package, which is 20 million vehicles delivered. As of June 30, Tesla considered only the 20 million delivery target to be probable among its various goals.

The letter also highlights a 75 percent attach rate for new deliveries in North America. This means that more than three-quarters of new cars delivered in the third quarter included a Full Self-Driving subscription. Tesla calls this a nearly twenty percentage point increase from the previous quarter. The company believes the software is driving demand in markets where it is available. However, the letter does not define this attach rate precisely. It is unclear if it counts subscriptions started with introductory offers or how many of those buyers are still paying a few months later. The active subscription metric excludes free trials, but the company does not say if the same rule applies to this attach rate.

Looking at the pace of growth, Tesla added 260,000 net new subscriptions in the third quarter. This was its best quarter yet. If it continues at this specific quarterly pace, it would take about eight years to reach the 10 million goal. If it looks at the average over the last 12 months, which is about 700,000 per year, the timeline stretches to nearly 12 years. The compensation package runs until 2035, so there is still time, but the definition of success is fixed.

For investors in the Midwest and elsewhere, the main takeaway is the opacity of the data. Tesla does not say how many of the 1.74 million users actually pay the monthly fee. The company obviously knows this number. It also does not provide retention data for the 75 percent attach rate. A 75 percent take rate on a $99 a month product would be a strong business, but only if those customers stay. The board wrote the definition, and Musk's pay depends on it. Until the company shows us how many North American buyers who started a subscription are still paying today, the 1.74 million figure remains a mixed bag of loyal monthly payers and past upfront buyers.

This metric is now the headline software number for Tesla. The challenge for readers is separating genuine monthly revenue from a legacy of upfront sales. The definition was written for the pay package, not necessarily for investors trying to understand the current business health. The road to 10 million is long, and the counting method makes it look shorter than it might be.