India’s passenger-vehicle industry enjoyed an unusually strong volume cycle after the GST cuts of September 2025. Between October 2025 and September 2026, volumes grew roughly 22% — well above the sector’s historical 6-7% trend. Bernstein’s auto team has now reverse-engineered that surge and reached a clear conclusion: a large part of the boom was temporary, and the payback begins in earnest from October.
The GST cut worked through two channels. It unlocked purchases that had been postponed ahead of implementation and improved affordability, bringing new households into the market. The result was a mix of pent-up demand, genuine market expansion, and purchases pulled forward from future periods. Those drivers are now diverging. Favourable base effects are rolling off, some of the pulled-forward demand is unwinding, and commodity-led price increases by OEMs have already erased more than half — in some cases 50-60% — of the original consumer price benefit.
Bernstein estimates that actual PV volumes in the first post-GST year exceeded a no-GST counterfactual by about 726,000 units. Of that excess, roughly 326,000 units (45%) can be attributed to genuine affordability-led market expansion, calculated using a framework of consumer price benefit, GST-exposed market share (about 80%), and a price elasticity of 1.2x. Another 280,000 units (39%) are classified as demand borrowed from future periods. The remaining 120,000 units (17%) are treated as residual or counterfactual error — neither confidently permanent nor purely temporary.
This decomposition explains the revised volume trajectory. Bernstein now forecasts FY27 wholesale PV growth of 12.7%, higher than its earlier 7% estimate, but almost entirely concentrated in the first half (26%). Second-half volumes are expected to be broadly flat. For FY28, the bank projects a 1.4% decline. The longer-term picture remains healthy: a 6.2% CAGR between FY25 and FY28E, rising to 8.2% if the forecast extends to FY29E. The next central government wage revision is expected to expand the affordable customer pool again, potentially lifting volume growth to 14-15% in FY29. Growth could arrive earlier in FY28 if wage announcements come sooner.
The repayment of borrowed demand will not be instantaneous. Bernstein assumes 40% of the opening demand debt is repaid in the second half of FY27 and the remaining 60% in FY28, reflecting the range of how far purchases were advanced — some by a few months, others by more than a year. Meanwhile, the residual affordability benefit continues to shrink as OEM price hikes absorb more of the original GST advantage. By FY28, the residual consumer price benefit is expected to reach zero.