What forex reserves are, and what they are spent defending

What sits inside the reserve

Four things make up the print the RBI releases every Friday. Foreign currency assets, the largest piece, stood at 630.980 billion dollars after the week's fall, mostly dollars and other major currencies held in liquid instruments abroad. Gold stood at 111.292 billion dollars. It rose 68 million dollars the same week even as the total fell, because gold's dollar value tracks the gold price rather than the RBI's own buying or selling. Special Drawing Rights, an IMF-created reserve asset India can draw on, stood at 18.739 billion dollars, down 106 million. India's own reserve position with the IMF, the paid-in quota it can draw against without conditions, stood at 4.89 billion dollars (Business Standard, RBI data, 25 September 2026). Foreign currency assets alone carried 14.816 billion dollars of the week's 14.881 billion dollar fall. Gold rose and SDRs fell only slightly, a pattern consistent with dollar sales driving nearly the whole move. A print like this can also move on valuation alone, without any dollars changing hands. That mechanism is covered in depth in what India's forex reserves hold, and why the weekly number moves.

Where the reserve comes from

The reserve builds the ordinary way. The RBI buys dollars when more come into the country than leave it, through exports, foreign investment or foreign borrowing, and draws it down the same way in reverse. A rising reserve can simply mean more dollars showed up that week than the RBI let the market absorb on its own. A falling reserve can mean the same thing in reverse, the RBI stepping in to sell. The RBI has drawn dollars in through other channels. These include a special deposit scheme for overseas citizens that has raised 143.6 billion dollars. That inflow has barely lifted the rupee (Bloomberg-compiled data via Briefs, 25 September 2026). What the reserve holds on any given Friday is the running total of every rupee-for-dollar decision the RBI has made and left in place.

Why it falls when the rupee is defended

When the rupee comes under pressure and the RBI decides to defend it, the mechanism is direct. The RBI sells dollars out of the reserve and buys rupees with them. Every dollar sold this way is a dollar the reserve no longer holds. The rupees withdrawn from circulation in the same trade are one reason system liquidity tightens on a week the RBI intervenes hard. That channel is covered in what an RBI open market operation does to liquidity and yields. The RBI has also used sell-buy dollar swaps this year. It sells dollars now and agrees to buy them back later at a set date. That defends the rupee today while committing to rebuild the reserve on a fixed schedule (Bloomberg-compiled data via Briefs, 25 September 2026).

The week ended 18 September was reported as the sharpest such fall since 15 November 2024. The stated backdrop was climbing oil prices, a cost India pays for in dollars. Foreign investors were also selling Indian equities, and a prolonged conflict in the Middle East added to the pressure (Bloomberg-compiled data via Briefs, 25 September 2026). None of that says where the rupee goes next. It explains why one specific week's reserve fell the amount it did.

The prior week, ended 11 September, had already posted a smaller fall, 4.924 billion dollars, to 780.782 billion dollars. A small fall followed by one seven times larger reads like a defense that intensified over a fortnight, rather than a single shock (Business Standard, RBI data, 25 September 2026).

The same mechanism has shown up before. India's reserve reached an all-time high of 728.494 billion dollars in the week ended 27 February 2026. A separate bout of pressure tied to the West Asia conflict then pushed the rupee down over several weeks. The RBI again sold dollars to slow the move (Business Standard, RBI data, 5 June 2026). A reserve built up over calm months is the thing that gets spent down over difficult ones. That is the entire reason a central bank keeps a reserve, instead of letting every dollar earned pass straight back out.

A currency the RBI never defended would still move, only faster and with less warning for importers and anyone holding rupee assets or rupee-priced debt. Defending it slows the currency's move without erasing the underlying pressure, whether that pressure is an oil bill or a wave of foreign selling. A reader who watches the headline number fall in isolation sees India getting weaker. Read next to what the RBI actually did that week, a fall reads more like evidence the tool is being used than evidence it has run out.

What the reserve cannot do

A reserve buys time, not a floor. It can slow how fast a currency moves and give the market room to settle in an orderly way rather than a disorderly one. It does not fix where the rupee ends up, and no fact in this piece says or implies where that will be. The RBI treats its reserve as a buffer against shocks. That sits alongside other regulatory and market tools, rather than a promise about any specific level (Business Standard, RBI data, 5 June 2026). A reserve is finite too. Every dollar spent defending a currency this month is a dollar unavailable next month. It has to be rebuilt first, through trade inflows, foreign investment, borrowing, or a swap maturing back into the reserve.

What adequacy means

The RBI has its own standard for whether a reserve is comfortable. Governor Sanjay Malhotra said on 5 June 2026, with reserves then at 682.3 billion dollars as of 29 May, that the reserve was adequate on two measures. Import cover stood at about 11 months, and cover of external debt at 89.1 percent (Business Standard, RBI Governor Sanjay Malhotra on reserve adequacy, 5 June 2026). Import cover asks how many months of imports the reserve could pay for if every other source of dollars stopped at once. It is a stress test, the kind nobody expects to actually run. Ten to eleven months is the range treated as comfortable. The RBI's own framework weighs it alongside external debt cover and the reserve's short-term volatility, all together rather than any single number alone. A reader checking today's adequacy should look for the RBI's current statement of it. September's fall does not move the ratio by the same proportion as the dollar figure; the import bill and the debt figure move on their own timelines too.

What the same idea looks like inside a portfolio

A central bank's reserve and a disciplined crypto allocation are built on the same idea. Keep something spare, on purpose. Spend it in the periods the rest of the position needs it defended, then rebuild it in the calmer ones that follow. Inside Qatobit's QSI Growth index, alongside Bitcoin, Ethereum, Solana and a Gold allocation, a stable reserve is held for this purpose. It is rebalancing capital that the monthly rebalance draws on and replenishes, on a methodology Qatobit publishes rather than a discretionary call made in the moment. None of that predicts when a drawdown lands, any more than the RBI predicts which week the rupee needs defending. It is about the spare capital already sitting inside the construction before the week that needs it arrives.

The same logic scales the way any position sizing does. A three percent crypto allocation inside a one crore rupee portfolio is a written-down number, chosen before markets move. How much of a portfolio should sit in crypto is the sizing question this leads to. What a crypto index actually holds covers what an allocation across equity, debt and crypto holds beyond the reserve piece. Unfamiliar terms along the way sit in the glossary.

A forex reserve is capital held on purpose, meant to be spent in the weeks a currency needs defending and rebuilt in the ones that follow. The week ended 18 September 2026 was one of the spending weeks. The question worth watching next is whether the pressure behind it, oil, foreign outflows, or both, eases enough that a following week's print rises instead.

Frequently asked questions

What are forex reserves?

Forex reserves are the foreign currency, gold, Special Drawing Rights and IMF reserve position a country's central bank holds. India's stood at 765.901 billion dollars for the week ended 18 September 2026, after the RBI sold dollars to defend the rupee (Business Standard, RBI data, 25 September 2026).

Why do forex reserves fall?

Reserves fall when the RBI sells dollars out of them, most often to slow a rupee move it judges too fast. They also move with the dollar value of the gold and SDRs held inside them, even without any selling. The week ended 18 September 2026 fell 14.881 billion dollars, the sharpest such drop since November 2024. The RBI defended the rupee against rising oil prices that week (Bloomberg-compiled data via Briefs, 25 September 2026).

What does the RBI do with forex reserves?

The RBI sells dollars from the reserve to buy rupees when it wants to slow a rupee move. It buys dollars back into the reserve when more come into the country than the market needs. It has also used sell-buy dollar swaps and a special deposit scheme for overseas citizens to draw dollars in through other channels (Bloomberg-compiled data via Briefs, 25 September 2026).

How much forex reserves does India have?

India's reserves stood at 765.901 billion dollars for the week ended 18 September 2026, the RBI's most recently published print at the time this was checked. The RBI publishes an updated figure every Friday, so a reader wanting the current number should check that week's release.

Do forex reserves affect the stock market?

Indirectly. Reserves and equities both move with some of the same pressures: a weak rupee, high oil prices, or foreign investors pulling money out. A heavy week of RBI dollar selling can also tighten rupee liquidity in the banking system. None of that makes the reserve number itself a signal for equities on its own; it is one input among several that share a common cause.

Crypto investments are subject to market risk. Not financial advice.