Tesla's FSD (Supervised) Attach Rate Hit 75% on New Vehicles. Here's Why That Single Number Could Matter More Than Robotaxi for the Stock in 2027.

Tesla (TSLA) reported a 75% attach rate for paid Full Self-Driving (Supervised) on new North American vehicles in Q3 2026, a figure that points to a subscription business gaining real scale.

Active paid FSD customers reached 1.74 million globally, up 67% year over year. That growth rate and customer base form the core of the bull case: recurring software revenue layered on top of vehicle sales.

The source article argues this stream could matter more to TSLA's valuation in 2027 than robotaxi development, with potential annual revenue in the billions. That is the article's thesis, and it rests on the subscriber count continuing to compound rather than stalling once early adopters are captured.

Interpretation: a 75% attach rate on new vehicles suggests FSD is becoming a default purchase rather than an optional add-on, which shifts the debate from "will people pay?" to "will they keep paying?" Retention is the open variable. Tesla has not disclosed detailed retention rates, so the durability of the 1.74 million figure remains unproven. Subscription revenue is only as valuable as the cohort that stays subscribed.

The comparison to robotaxi also reframes where investors may assign value. Robotaxi is a future-state bet; FSD (Supervised) subscriptions are a reported, measurable number today.