RBI Tightens Grip on Rupee Market

The Reserve Bank of India's strict new rules have largely ended a period of heavy arbitrage trading in the Indian rupee. By imposing tight limits on banks' foreign exchange positions and blocking access to offshore non-deliverable forward (NDF) contracts, the central bank pushed major players to exit trades that exploited price differences between India and overseas markets. This action seems to have met its main goal of stabilizing the rupee and cutting currency swings, while also changing how the market operates.

New Limits for Banks and NDFs

Starting April 10, 2026, banks must limit their net open rupee positions onshore to $100 million. This is a sharp drop from previous internal limits, which could be as high as $1 billion. The RBI's March 27 directive specifically targeted arbitrage trades linking the onshore market with dollar-settled NDFs. Estimates suggest around $40 billion in these positions have been closed out. The RBI also stopped authorized dealers from offering rupee NDFs to clients, both local and foreign, further blocking offshore speculation. This crackdown has helped the Indian rupee recover significantly after hitting lows near 95 per dollar. One-year forward premiums have also fallen, suggesting most positions have been unwound.

Understanding Non-Deliverable Forwards (NDFs)

Non-deliverable forwards (NDFs) are private agreements where the profit or loss from the difference between a set future exchange rate and the current rate is paid in a widely traded currency, like the US dollar, instead of the local currency. This method is common for currencies facing capital controls or conversion limits, offering ways to hedge and find arbitrage profits. RBI Governor Sanjay Malhotra explained that these arbitrage trades had caused "heightened volatility" and "increased price swings" recently, leading to the RBI's action. The move fits the RBI's long-standing approach of letting the market set exchange rates but stepping in carefully to control extreme swings, not to fix a specific rate. While the RBI has historically managed volatility via spot and forward markets, these new rules are a major regulatory change from letting banks set their own limits. Many central banks manage volatility, but the RBI's strong move to restrict offshore tools shows a clear effort to regain direct command over domestic market movements and limit how overseas pricing affects local markets.

Costs and Unforeseen Risks

While the RBI's strict controls have stabilized the rupee, they also create new risks. Banning NDF offers to clients and drastically cutting banks' onshore positions could divide the currency market. This division might lead to more volatility in the onshore market, potentially becoming the only place for many to hedge their currency needs. The sudden tightening has already affected bank treasury departments, with estimated system-wide losses between Rs 3,000 crore and Rs 4,000 crore. These losses stem from mandatory adjustments to the market value of positions built as the rupee fell. Adding to the situation, a rush of corporate arbitrage on March 30 saw firms exploit openings from banks unwinding positions. They traded over $7 billion in NDFs, pushing the rupee to a record low before the RBI stepped in more forcefully. This shows how regulatory changes can open unexpected arbitrage opportunities, requiring more central bank action and potentially hindering accurate price discovery.

Temporary Measures, Long-Term Goals

Governor Sanjay Malhotra stated that these measures are "reactions to specific market movements" and not "structural changes." He emphasized that they "are not going to remain in place forever." The RBI reiterated its commitment to developing and deepening the foreign exchange market, alongside promoting the rupee's international use. The market will watch for cues from the RBI on when these temporary restrictions might be reviewed and eventually lifted, once conditions stabilize.