India’s September inflation surge has strengthened expectations of further monetary tightening, with economists increasingly factoring in at least another 50 basis points of repo rate hikes and a terminal rate of 6-6.25% in the current cycle. The outlook has been complicated by expectations that inflation could breach the Reserve Bank of India’s 6% upper tolerance limit in October, alongside persistent rupee weakness, which could amplify imported price pressures.

Retail inflation accelerated to 5.54% in September from 4.82% in August, driven by food prices and a broadening of inflation across the consumer basket. Food inflation climbed to 7.74%, while rural inflation crossed 6% to reach 6.08%. The increase has reinforced concerns that the inflation shock could become more persistent as a deficient monsoon, strong El Niño conditions, and elevated global commodity prices weigh on the outlook.

ANZ expects headline inflation to breach the RBI’s 6% tolerance threshold in October, with limited relief from base effects. It expects two additional 25-basis-point hikes in December and February, while warning that persistent inflation and currency weakness could result in a steeper tightening cycle.

Emkay Global and Kotak Institutional Equities also expect at least 50 bps of further hikes, with 25 bps increases in December and February. Both expect inflation to remain around 6% in the coming months, raising the risk of negative real interest rates unless monetary policy tightens further.

IDFC FIRST Bank estimates October inflation at 6.1%, driven by food prices and adverse base effects. It expects the terminal repo rate to settle at 6.0-6.25%, although it favours a gradual approach given that the current inflation impulse is largely supply-side driven and the economy is not showing signs of overheating.

Inflation Broadens Beyond Food
The September print has raised concerns about the breadth of price pressures rather than the headline rate alone. IDFC FIRST Bank found that 27% of the CPI basket by weight recorded inflation of 6% or higher in September, compared with an average of 12% between January and May. Within food, 59% of items by weight registered inflation of at least 6%.

Emkay noted that 46% of the CPI basket by weight recorded inflation above 4% in September, compared with 37% in August. Core inflation also edged higher to 4.3%, while core inflation excluding precious metals rose to 3.2%.

The pipeline remains a concern. Higher global commodity prices, shipping costs and input expenses are feeding into producer prices, with the risk that firms pass these costs on to consumers. A prolonged oil-price shock could intensify this process, while weak rainfall and El Niño conditions threaten food supplies into the winter crop season.

SBI Research expects inflation to peak at 6.7-6.8% in November and projects the 2026-27 average at 5.3%. It sees the peak policy rate reaching 6%, with the RBI potentially choosing between a 50-bps repo hike in December and a more gradual approach involving an interim increase in the marginal standing facility rate followed by a 25-bps repo hike.

Rupee Stability Becomes Key Policy Variable
The rupee is emerging as an important factor in determining the pace of tightening. Currency weakness can raise the domestic cost of imported crude oil, energy and other commodities, adding to inflation even when the initial shock originates overseas.

SBI Research said the RBI’s response would depend partly on the rupee’s trajectory, alongside food and energy prices. ANZ similarly warned that continued currency weakness could keep inflation above the target for longer and increase the risk of a steeper hiking cycle.

IDFC FIRST Bank sees scope for a more gradual approach if recent RBI measures help moderate the pace of rupee depreciation. This creates a policy trade-off: the central bank must contain inflation expectations without tightening too aggressively in response to a supply-driven shock.

The immediate focus is shifting towards October inflation and the extent of currency pressure. If headline inflation breaches 6% and underlying price pressures continue to broaden, expectations of further hikes are likely to strengthen. A more stable rupee and moderation in commodity prices, however, could give the RBI room to spread the expected tightening over several meetings rather than front-load it.

For now, the economist consensus points to at least 50 bps of additional tightening, with the terminal repo rate seen at 6-6.25%. The pace will depend on whether inflation becomes entrenched and whether currency stability can reduce the need for a more aggressive policy response.