The Reserve Bank of India’s September bulletin has put a number on the deposit mobilisation that steadied the rupee earlier this year: foreign currency non-resident (B) deposits accounted for about $133 billion of the $143.5 billion raised through special inflow schemes, even as the central bank flagged that the currency’s gains have reversed in September with crude oil prices rising.
The same bulletin, released on September 26, said August bank deposit growth was the fastest in 15 years. For bank boards and corporate treasuries, the two data points belong together. They show a liability franchise that improved sharply through the middle of the year, and a foreign-currency window whose economics can turn quickly when oil moves.
What the RBI bulletin says
Deputy Governor Poonam Gupta’s assessment in the bulletin described the rupee’s overcorrection as having unwound. The currency had drawn support from FCNR(B) inflows, which are dollar deposits parked with Indian banks by non-resident Indians and others. Those inflows gave banks a pool of foreign currency that could be swapped into rupees, easing pressure on the spot market.
The support did not last into September. Higher crude oil prices changed the arithmetic: India’s import bill rises when oil climbs, and the rupee gives back gains that were not backed by durable flows. The bulletin’s message is not that FCNR(B) deposits disappeared. It is that the tailwind they provided has been offset by a familiar current-account pressure.
Why bank deposit growth matters
August’s deposit growth, the fastest in 15 years, gives banks more room to fund credit without leaning as heavily on high-cost bulk deposits. That matters for net interest margins and for lenders that have been competing for deposits while credit growth has stayed ahead of deposit growth for much of the cycle.
But the composition matters as much as the headline. FCNR(B) deposits are not ordinary retail savings. They carry a cost linked to overseas interest rates and swap arrangements, and they can reverse when rate differentials narrow or when depositors see better opportunities elsewhere. A 15-year-high deposit growth print is a strong liability-side signal, but it does not make the system immune to global rate and oil shocks.
For Indian companies, the read-through is practical. Importers with unhedged dollar payables are exposed if the rupee resumes its slide. Exporters may see a more competitive exchange rate, but only if global demand holds. Banks with large overseas borrowing programmes will watch the swap market, because the cost of converting FCNR(B) dollars into rupees determines whether the inflow remains attractive.
The oil reversal
Crude is the hinge. The bulletin notes that the rupee’s FCNR(B)-led gains reversed in September as oil prices rose. West Asia tensions have kept the market alert to supply disruptions, and India’s sensitivity to crude is direct: every $10 increase in the oil price adds to the import bill, widens the trade deficit, and feeds through to inflation expectations.
That is why the RBI’s September assessment should be read with the August deposit data. The banking system entered the final quarter of the calendar year with stronger deposit growth. But the external account has become less supportive. The rupee’s path will depend on whether oil stays elevated and whether foreign portfolio flows return.
The bulletin’s currency read landed in a week when foreign institutional investors were net sellers of Indian equities for a sixth straight week, offloading ₹11,490 crore in the week ended September 25, while domestic institutional investors bought ₹16,398 crore, according to exchange data. That divergence matters for the rupee: portfolio flows are another marginal source of dollars, and their absence makes deposit inflows and oil prices more important for the currency’s near-term path.
What to watch next
Bank treasurers will track three things: the pace of FCNR(B) renewals, the swap cost for dollar deposits, and the RBI’s stance on liquidity. Companies with foreign-currency debt will watch the same signals, because a weaker rupee raises the domestic cost of servicing dollar loans even when global rates are unchanged.
The bulletin is not a policy decision. It is a monthly stocktake, and its language is deliberately measured. But for institutions that manage balance sheets, the message is clear enough: deposit growth is a cushion, not a cure. The FCNR(B) boost helped India through one stretch of currency pressure. September’s oil move shows how quickly that help can be tested.