A currency defence, read from the documents

Chapter 5 listed the instruments. In October 2026 the Reserve Bank used most of them at once, and published the details. This chapter is an exercise in reading them.

Four days

Date	What was announced
7 October 2026	Policy repo rate raised 25 basis points to 5.50%, unanimously; stance changed to calibrated tightening
10 October 2026	Regulatory measures for the foreign exchange market, via two circulars
10 October 2026	A special window to sell dollars to three public sector oil marketing companies
12 October 2026	The oil window takes effect, "until further notice"

Three of chapter 5's four instruments, inside a week. Only direct spot intervention is absent from the announcements, and it would not be announced.

The regulatory measures, and what each one does

The release of 10th October issued A.P. (DIR Series) Circulars No. 25 and No. 26. Four measures.

A ban on rebooking cancelled contracts. Authorised dealers may not let a user rebook any cancelled rupee foreign exchange derivative contract, deliverable or non-deliverable, cancelled with any dealer after the directions. Rollovers at maturity remain allowed.

The mechanism: cancel-and-rebook is how a position is traded rather than hedged. A genuine hedger holds a contract to maturity; someone taking a view cancels when the rate moves and rebooks at the new level, booking the difference. Removing rebooking removes the round trip and leaves the hedge.

Position limits cut by 95%. The limit for hedging contracted exposures without producing proof of the underlying exposure falls from USD 100 million to USD 5 million equivalent. The same cut applies to exchange-traded rupee currency derivatives taken without an underlying exposure, measured across all recognised stock exchanges combined.

The mechanism: the "without documentary proof" allowance exists so that genuine businesses can hedge quickly without paperwork for every transaction. At USD 100 million it is also a large doorway for taking a position with no underlying trade at all. Cutting it to 5 million keeps the convenience for ordinary users and closes it as a speculative channel.

A declaration against double hedging. Dealers must obtain and retain a declaration that the same underlying exposure has not been hedged with another dealer.

The mechanism: one real export receivable hedged five times with five banks is one hedge and four positions. The declaration makes that a false statement rather than a gap.

A 20% cash Foreign Exchange Risk Reserve. For rupee derivative contracts with a notional value above USD 2 million equivalent, dealers must hold a cash reserve with the Reserve Bank equal to 20% of the rupee equivalent of the notional amount. It applies to contracts hedging current account exposures where the user is buying foreign currency against the rupee.

The mechanism: this is the heaviest of the four and the most precisely aimed. It makes large contracts in one direction — buying dollars, selling rupees — expensive to write, by freezing a fifth of the notional as cash at the central bank. Note the asymmetry: it applies to buying foreign currency, not to selling it. The cost falls on one side of the market only.

The oil window, which is the cleverest one

On the same day, the Reserve Bank opened a window to sell dollars directly to Indian Oil, Hindustan Petroleum and Bharat Petroleum, through designated banks, covering "the entire daily dollar requirements" of the three. No cap, no stated size, effective 12th October, until further notice.

Chapter 5 said oil is India's largest identifiable external shock. The oil marketing companies are the largest single, predictable, non-negotiable buyers of dollars in the Indian market — they must buy, every day, whatever the rate, because the country needs fuel.

Taking that demand out of the open market does three things at once. It removes a large daily block of rupee selling. It removes the most visible and predictable demand, which other participants can otherwise trade ahead of. And it does so without announcing a target level, because the Reserve Bank is simply meeting a customer's requirement rather than defending a number.

It is also direct intervention by another name: the dollars come from reserves either way. The difference is that this version is not observable as market activity.

What the documents say about why

Now the part the exercise is built around.

The stated reason, in full, is: "In view of the evolving conditions and to ensure orderly functioning of the foreign exchange market."

The oil window release says the decision followed an assessment of "current market conditions."

That is the entire explanation. The conditions are not described. No figure is given, no level is mentioned, no judgement about the exchange rate is offered. The releases describe what will be done and say the aim is to strengthen market discipline and risk management while keeping the market orderly and transparent.

This is deliberate, and chapter 5 explained why: a central bank running a managed float cannot name a level it is defending without handing the market a target. The silence is the policy.

What can and cannot be concluded

Separating these is the skill, and it is worth doing explicitly.

From the documents alone. The Reserve Bank raised rates, restricted speculative positions in rupee derivatives by 95%, made large one-directional derivative contracts expensive, and took the oil companies' daily dollar demand out of the open market — all within four days. Every one of those measures acts in the direction of supporting the rupee. A central bank does not do four of those things in a week about a currency that is behaving.

From the balance of payments. Chapter 3 found the trade deficit widening 17.1% over April to August, and chapter 4 found gross capital flows of unusual size in both directions in August. Both are consistent with pressure.

Not from any of it. The level of the rupee on any particular day, how much of it was a dollar story rather than a rupee story, whether the measures worked, and what the Reserve Bank was actually looking at. The releases do not say, the balance of payments arrives six weeks late, and the exchange rate on 10th October is a market fact these documents never mention.

The honest write-up of this episode therefore has a confident half and a marked gap — which is the same shape as chapter 22 of the company analysis subject, where the sentence ended in a blank the accounts could not fill.

What it costs

No intervention is free, and three costs are worth naming.

The reserves. Dollars sold through the oil window come out of the same stock as any other sale.

Market function. A 95% cut in position limits and a 20% cash reserve make the market thinner and hedging dearer for everybody, including the genuine exporter the rules are written to protect. Measures aimed at speculation always catch real users, which is why they are usually framed as temporary.

Credibility, in both directions. Measures that work buy time. Measures that visibly fail to hold a level invite a harder test, because the market has learned where the authority's limit is.

Which is the general lesson, and the one to carry out of this subject: a currency defence is a purchase of time, not a change of direction. What it buys is the chance for the underlying flows of chapters 3 and 4 to adjust. If they do, the defence looks prescient. If they do not, it looks expensive — and the difference is decided by the ledger rather than by the announcement.

The point

In four days in October 2026 the Reserve Bank raised the repo rate to 5.50%, banned rebooking of cancelled rupee derivatives, cut the no-documentation position limit from USD 100 million to USD 5 million, imposed a 20% cash reserve on large one-directional derivative contracts, and opened an uncapped dollar window for the three public sector oil marketing companies. Every measure points the same way. The stated reason is one clause about "evolving conditions", and the conditions are never described, because a managed float cannot name the level it is defending. What the documents support is the direction; what they do not support is any claim about the level, the cause, or whether it worked.