Tesla's FSD numbers hide a catch

A new metric in Tesla's quarterly report raises questions about how the company defines success for its most hyped software feature.

Tesla reported that it now has 1.74 million active Full Self-Driving subscriptions, a figure representing a 67% increase from the same period last year. However, a footnote in the Q3 2026 shareholder letter reveals that this count is not limited to current monthly payers. The metric explicitly follows the definition used in the 2025 CEO Performance Award, which includes both upfront payments and monthly subscriptions. This means that owners who purchased the feature outright, some years ago, are still included in this active count as long as their vehicles remain operational.

This counting method carries significant weight because reaching 10 million active subscriptions is a specific milestone required for Elon Musk to earn parts of his 2025 pay package. The distinction matters further because hundreds of thousands of these counted users were originally sold unsupervised self-driving capabilities, a feature Tesla has yet to fully deliver. The company stopped selling FSD as a one-time purchase on February 14, 2026. New customers in the US now pay $99 per month, while previous buyers who paid up to $15,000 upfront remain in the statistics. The only group excluded from this total is those on free trials.

Analysts flagged this accounting approach back in April when the number stood at 1.28 million. Six months later, Tesla has still not disclosed how many of the 1.74 million users are actually paying the monthly fee. The letter applies a similar logic to delivery figures, counting any unsupervised Robotaxis placed in commercial operation toward the 10.2 million cumulative delivery milestone, which also aligns with the compensation plan's 20 million vehicle target.

Tesla also claims that over 75% of new North American deliveries in Q3 included FSD subscriptions, citing a nearly twenty percentage point sequential increase. The company suggests that the software is driving demand in available markets. However, the report does not define this attach rate, leaving it unclear whether it includes introductory offers or if it accounts for retention after a few months. Unlike the active subscription metric, the letter does not specify if free trials are excluded from this 75% figure.

The path to the 10 million subscription milestone remains long. The 2025 award consists of 12 tranches, each requiring both a market cap and an operational milestone. As of June 30, only the 20 million delivery target was considered probable. In Q3, Tesla added 260,000 net FSD subscriptions, its best quarter to date. At this pace, reaching 10 million would take about eight years. At the average pace of the last 12 months, the timeline extends to roughly 12 years, well within the award's 2035 deadline.

Critics argue that counting upfront buyers as subscribers is not inherently wrong, but presenting the total as proof of momentum is misleading when the definition was crafted for compensation purposes. The board wrote the definition, the CEO's pay depends on it, and the company has not yet revealed how many customers pay $99 monthly. The 75% attach rate is a more compelling claim if it holds up, but investors still need clarity on retention rates among North American buyers to understand the true health of the business.