The RBI’s decision to bar banks from NDD contracts is a strategic maneuver to regain "monetary sovereignty" over the Rupee. For years, the offshore NDD market has acted as a shadow market where hedge funds and global investors bet on the Rupee without holding the physical currency. Because these contracts are settled in US Dollars (cash-settlement) rather than INR, they create a price-discovery mechanism outside India's jurisdiction. This often led to situations where offshore volatility would "bleed" into the domestic market, forcing the RBI to burn through its forex reserves to defend the currency.
Furthermore, the RBI identified a growing trend of misuse where participants were using "hedging" as a facade for pure speculation. By cancelling and re-entering contracts based on favorable movements, traders were essentially gambling on the Rupee’s decline. By cutting off bank participation in these instruments, the RBI is effectively "onshoring" the Rupee market. This ensures that currency derivatives are backed by underlying trade or investment needs, reducing artificial fluctuations. For students of the Indian economy, this highlights the RBI’s preference for a stable, "managed float" exchange rate regime over a completely deregulated offshore market.