Every used-Tesla buyer worries about hardware obsolescence. The number that actually determines whether the purchase makes sense is depreciation — and it dwarfs every other cost by a wide margin.
On a used Model 3 purchased at year 2 for $41,359, projected mid-2029 resale is ~$23,500 private-party. That's a ~$17,900 capital loss — ~$497/month, roughly 60% of the $839/month all-in cash cost. Free workplace charging saves real money, but it's noise against that figure.
The hardware question is less urgent than the forums suggest. Tesla stated on the Q1 2026 earnings call that "AI4 is sufficient for unsupervised Full Self-Driving." AI5 (HW5) slipped to roughly mid-2027 for production cars; even the Cybercab launches on HW4. FSD v15 is confirmed to run on HW4. Through 2026–2029, HW4 is current-generation.
The honest risk: Tesla admitted in April 2026 that HW3 can't do unsupervised FSD — hardware it had previously called sufficient. The promised free retrofit became a paid ~$3–5k swap that still hasn't shipped. HW4 faces the same eventual pattern; a memory-doubled HW4 Plus arrives in 2027. That's a real tail risk, not the base case.
Used Tesla values are currently firming — up 4.3% after the EV credit expired — which means buying at year 2, after the steep early drop, puts you on the flat part of the depreciation curve.
The decision isn't really about FSD hardware. It's about whether ~$839/month makes sense for the car and your situation.
Source: multi-source deep-research report 2026-07-06-tesla-m3-3yr-cost-hw4-obsolescence, dated 2026-07-07.
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