FCNR(B) swap window: RBI’s rupee defence strategy

India’s rupee defence has been a live topic across market forums after the Reserve Bank of India (RBI) disclosed the scale of dollar inflows mobilised through a special USD-INR swap facility. The central bank drew $143.596 billion in foreign currency inflows under the facility up to September 18, with FCNR(B) deposits forming the overwhelming share. The window was introduced in June and allowed banks to swap US dollars for rupees with the RBI, and reverse the swap when it matures. Social media discussion has focused on two points at once: the inflow numbers are huge, yet the spot rupee did not strengthen dramatically. Posts also highlight that the swap is a balance-sheet operation rather than a direct market sale of dollars. That difference matters for how quickly the spot exchange rate reacts. It also matters for the future, because swaps and deposits come with repayment obligations. The result is a policy move that buys time and liquidity, while shifting where the FX risk sits.

How the RBI swap window changed the playbook

For years, a common way to smooth rupee volatility was selling dollars from forex reserves in the spot market. The recent approach leaned more on attracting foreign currency into the system through NRI deposits and overseas borrowings, rather than relying only on intervention. Under the special facility introduced in June, banks could raise foreign currency and swap it with the RBI for rupees with an agreement to reverse later. This added rupee liquidity while rebuilding foreign currency resources through the swap route. Online threads often described it as the RBI seeking “breathing room” when the rupee was under pressure. The programme was also linked to a period when reserves were reported to have fallen from $128.5 billion in the last reporting week of February 27 to around $175 billion by the last week of May. The context cited in posts includes pressure after the Iran war began and volatility from the West Asia conflict. The RBI has also been active in both spot and forward markets to contain volatility, according to the same discussions.

What the RBI mobilised and where it came from

The mobilisation numbers were the headline, especially the dominance of FCNR(B) deposits. In one RBI disclosure, total inflows under the concessional swap facilities reached $136.38 billion as of August 31. Within that, FCNR(B) deposits were $127.23 billion, while OFCBs were $1.26 billion and the ECB route was $1.89 billion. Another update referenced $143.596 billion mobilised up to September 18, again led by FCNR(B). A separate Finance Ministry statement cited $13 billion as of August 21, with FCNR(B) at $15.40 billion at that point. The differences reflect different cut-off dates that were shared widely on social media. The intent, as described by the government, was to strengthen India’s “external buffers” to handle global volatility. Many posts compared it with the 2013 NRI deposit drive that was launched after the US Federal Reserve’s tapering announcement.

How FCNR(B) deposits and the swap actually work

FCNR(B) deposits are foreign-currency deposits that NRIs can hold with Indian banks. The principal and interest are maintained in a foreign currency, which is why depositors do not carry rupee risk on the deposit itself. In the swap structure discussed online, banks raise fresh 3-to-5-year FCNR(B) deposits in foreign currency and then swap the dollars with the RBI for rupees at a concessional rate. The RBI absorbs the hedging cost for the principal under the concessional swap. The swap is reversed later, meaning the RBI must return dollars when the swap matures. That is why the inflows are often described as a form of external borrowing rather than permanent reserves. The same threads repeatedly note that the risk does not disappear, it relocates across participants. This mechanics-focused angle explains why the inflow headline and the spot FX move can diverge.

Why the rupee’s reaction looked smaller than expected

A widely shared observation was that the rupee did not show the “desired impact” despite the dollar pile-up. The rupee hit a lifetime low of 96.87 on May 20, which was cited as a major reason the RBI launched the scheme. It was at 95.71 on June 8 when the scheme began, and it closed at 94.95 on Tuesday after the FCNR(B) window was closed, then at 94.97 on Wednesday. Those levels became central to online debate, because they suggest only a modest strengthening over the period despite very large mobilisation. One explanation repeated in posts is that the FCNR(B) route is a swap, not a market sale. Banks hand dollars to the RBI for rupees, so those dollars do not necessarily enter the open market where the exchange rate is set. In other words, the facility can improve the RBI’s FX position and system liquidity without mechanically pushing spot USD-INR lower. That framing is why many traders focused on the RBI’s simultaneous spot and forward activity.

The role of RBI intervention, forward sales, and hedging

Social media posts pointed to a gap between “inflows” and “spot impact,” and tried to account for it. One reason cited is continued RBI dollar selling in spot and forward markets to smooth volatility linked to the West Asia conflict. At end-June, the RBI’s net forward short position was cited at $103 billion, just below the all-time high of $107 billion at end-May. A second reason is bank hedging linked to the deposit structure. Because the RBI covers only the principal through the swap, banks still owe foreign-currency interest to non-resident depositors. To protect those interest outflows, banks buy dollars forward, which can add to dollar demand. This dynamic can offset the psychological effect of strong gross inflows. It also explains why some observers said the scheme does not remove rupee risk, it shifts it into future cash flows and hedges. As a result, the market sees two opposing forces at once: a rebuilt buffer through swaps and ongoing demand through hedging.

Why banks and NRIs participated so aggressively

The discussions attribute the heavy take-up to both pricing and risk structure. The facility reduced exchange-rate risk for banks by offering a concessional swap that covered hedging cost on the principal. That made it easier for banks to offer more attractive returns to depositors, which helped draw in the diaspora. Participants repeatedly referenced India’s 35-million-strong diaspora as the base the scheme tapped. Posts also noted that FCNR(B) interest was described as tax-free and fully repatriable in the shared context. Another draw was that banks could leverage the foreign-currency deposits, with some lenders offering loans several times the original deposit. Specific leverage ranges were widely circulated: 9x at private banks such as HDFC Bank and ICICI Bank, and up to 19x at banks such as HSBC. Regulatory relaxations were also discussed, including that certain loans against fresh or renewed FCNR(B) deposits could be made without worrying about ANBC-linked priority sector targets. Posters also highlighted that banks did not have to set aside CRR and SLR on certain fresh FCNR(B) deposits and fresh NRE term deposits mobilised in the specified window.

The timing shift: early closure of the FCNR(B) window

The RBI’s decision to change timelines became another key thread. The FCNR(B) swap window was advanced and closed on August 31, earlier than the originally indicated schedule, according to posts citing RBI communication. At the same time, the closure date for ECBs and OFCBs was retained at December 31 in the shared context. The early closure was read in two ways online: either the RBI was satisfied with mobilisation, or it wanted to manage the size and maturity profile of future obligations. The update that inflows under the facility had touched $136.38 billion as of August 31 added weight to the “sufficient mobilisation” view. The subsequent disclosure of $143.596 billion till September 18 kept the focus on how much was ultimately drawn into the system. Traders also debated whether the move would change banks’ pricing of dollar deposits once the window closed. The operational point remains that swaps mature and must be reversed, regardless of the window being open or shut. That is why timing and maturity buckets matter for macro watchers.

The main risk markets keep flagging: repayment and rollover

Even supporters of the scheme on social media repeatedly noted that deposits and loans must eventually be repaid. When swaps mature, the RBI must return dollars to banks under the reverse transaction. That creates a future demand for dollars at maturity, unless it is managed through renewals, reserves, or new inflows. The programme is therefore often described as creating future repayment and rollover obligations. Another risk discussed is higher dependence on foreign capital, which can become challenging if global sentiment turns. The leverage angle adds to the sensitivity, because lending several times the deposit increases balance-sheet exposure if funding conditions shift. There is also a messaging risk, because big inflow numbers can lead to expectations of immediate rupee strength that may not materialise in spot. Finally, bank hedging for interest payments can keep forward dollar demand elevated, which can influence near-term pricing. These are the reasons many posters framed the scheme as a liquidity and buffer tool, not a one-step fix for USD-INR.

What traders and investors are watching next

Market conversations have moved to what happens after the window-driven inflows peak. One focus is the RBI’s ongoing mix of spot intervention, forward market activity, and swap-based buffer building. Another is whether the rupee remains stable if volatility in global energy and geopolitics persists, given the context referenced in posts. Participants are also watching how banks manage the interest leg hedges and the maturity profile of deposits. The size of the RBI’s forward book was repeatedly cited as an important indicator alongside headline reserves. Investors are also tracking whether mobilisation through ECBs and OFCBs continues up to the stated December 31 closure date. On the banking side, discussions centre on how much lending was built on top of these deposits, and what happens when the preferential conditions end. For the rupee, the key takeaway in the social chatter is that the facility can support buffers and liquidity without guaranteeing a large spot move. That is why the conversation has stayed active even after the FCNR(B) window’s closure.