The central bank’s surprise cap on forex positions gave the battered rupee a brief reprieve on Monday, but bankers and analysts ‌say the steps will hit banks' trading revenue and that economic risks will erode currency gains.

The ​Reserve Bank of India opened a new front in its fight for currency stability on ⁠Friday, asking banks to limit net open rupee positions to $100 million, shifting to an absolute dollar limit from a previous cap of 25 per cent of total capital.

The change represents a tightening and comes as the war between Iran and the US and ‌Israel pushes up oil prices and tightens gas supply, heightening economic risks, wild currency swings and worries about capital flight from emerging markets.

India is particularly vulnerable as it imports 90 per cent of ‌its oil needs. The higher cost of crude oil imports is expected to widen India's current account ‌deficit.

Heavy ⁠selling from foreign investors pulled the rupee down to a record low of 94.81 against ⁠the US dollar on Friday. On Monday, it opened about 1 per cent higher at 93.60 before trimming gains.

"This is a move that reflects the RBI's desire to stabilise the currency in the immediate term, while noting that the FX interventions via dollar sales alone may not be ​cutting it since the risks from the oil ‌price rise are so large," said Dhiraj Nim, an economist and FX strategist at ANZ.

But the rupee is unlikely to see a lasting recovery, Nim said. "Near-term stability is likely but (the rule change) doesn't rewrite the fundamental pressures."

Closing the arbitrage gap

The curbs target the basis trade arbitrage for banks that grew as offshore ‌markets started to price in quicker rupee declines spurred by the Iran war relative to the ​onshore markets, four bankers said.

Collectively, banks had built up arbitrage positions of between $25 billion and $35 billion, a person familiar with the central bank's thinking said.

Such positions pressured the spot rupee as ⁠banks bought dollars locally and sold offshore, this person explained.

He and all the bankers mentioned in this story requested anonymity as they are not authorised to speak to the media. The RBI did not immediately respond to an ‌email seeking comment.

"By limiting the positions to just onshore positions, the RBI seems to have targeted the popular trade where banks buy USD/INR onshore and sell USD/INR NDF offshore to benefit from the spread," Michael Wan, senior currency analyst at MUFG Bank, said.

Banks’ treasury profits hit

What were once profitable arbitrage positions are now set to inflict sizeable losses on banks, the bankers said.

The 1-month dollar/ rupee non-deliverable forward points - which reflect the cost of hedging forex risk a month ahead - surged to a high of 100 paise on Monday, far above the 3–5 paise ‌spread at which these trades were initially locked in.

The wider the spread, the more money banks stand to lose because they ​exit trades at higher levels than where they entered.

The late Friday directive triggered a wave of weekend calls, with bankers seeking a deferral of the April 10 deadline set to meet the ⁠new position limits.

Fearing "major dislocation", bankers sought a three-month period to meet the deadline - a period over which most ⁠of these positions would have matured, according to six bankers.

For an estimated $30 billion arbitrage book, each 1 paisa widening beyond the locked-in spread translates into a 300 million Indian rupee ($3.20 million) loss, according to ‌Reuters calculations.

"If the spread between NDF and onshore markets stays elevated around current levels, banks could be staring at meaningful losses from the trades," said Kunal Kurani, vice-president at forex advisory firm Mecklai Financial.

Following the ​rupee's Monday early rally, Kurani has been asking importer clients to lock in FX hedges.

($1 = 93.8700 Indian rupees)

Published on March 30, 2026