Why India manages the float. M7.06 taught the impossible trinity: a country cannot simultaneously have a fixed exchange rate, free capital flows, and an independent monetary policy. It must give up one. India's answer is the managed float: it keeps monetary independence and partial capital-account openness, lets the rupee be market-determined, but the RBI intervenes to smooth volatility, not to defend a level. The doctrine, stated by successive governors, is explicit: the RBI has "no target for the rupee" and acts only to curb "excessive volatility" that could be destabilising. Why bother intervening at all if you believe in floating? Three practical reasons: (1) a disorderly slide can become self-fulfilling (importers rush to hedge, foreign investors flee, the fall accelerates, which is the M7.06 sudden-stop dynamic); (2) sharp depreciation is inflationary in an economy that imports ~85% of its oil, which directly threatens the 4% CPI target; and (3) many Indian firms have unhedged dollar liabilities (external commercial borrowings), so a lurch in the rupee is a corporate-balance-sheet event. So the RBI leans against the wind in both directions.
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How does the RBI use reserves to manage the rupee?
The mechanics, and the catch (recap from M7.02). To slow a fall, the RBI sells US dollars from its reserves and buys rupees, which withdraws rupee liquidity from the domestic system and inadvertently tightens monetary conditions. To slow a rise (and rebuild reserves), it buys dollars and pays in newly created rupees, injecting liquidity. FX intervention and domestic liquidity are the same balance sheet, so unless the RBI offsets with an OMO in the other direction (sterilised intervention), an FX operation is also a domestic-monetary operation. The RBI also operates in the forward market (and in non-deliverable forwards offshore), so its net dollar position, spot reserves plus the forward book, can differ from headline reserves; a sophisticated read nets the forward book against the headline number.
Does the rupee weaken over time?
The rupee's structural path. Over the long run the rupee depreciates against the dollar, roughly 2–4% a year on average across cycles (illustrative; check the trend on RBI/FRED data), for a first-principles reason from M0.03 and M7.06: India runs structurally higher inflation than the US, and by relative purchasing-power parity, the currency of the higher-inflation country tends to weaken to keep traded-goods prices aligned. USD/INR was around 83–88 through 2024–25 and is ~87 as of mid-2026. This matters enormously for a cross-border investor: an Indian rupee investor in US assets is long the dollar and earns the depreciation as a tailwind; a dollar investor in Indian equities must clear the ~2–4%/yr currency drag before the investment even breaks even in dollar terms. That is exactly why India's equity returns in rupees have often looked far better than the same returns measured in dollars, and why foreign investors demand a higher hurdle. Never quote an India return without saying in which currency.
How do you judge whether reserves are enough?
The reserve buffer, and how to judge it. India holds one of the world's largest FX-reserve piles: ~$690 billion as of mid-2026 (illustrative; it crossed $700bn briefly in late 2024, check on the RBI Weekly Statistical Supplement). Reserves are the war chest that makes the managed float credible and that buys insurance against a sudden stop. But the number in isolation is meaningless; you judge adequacy against what it must cover. Three standard metrics (worked in Worked Examples):
- Months of import cover = reserves ÷ average monthly imports. The old IMF rule of thumb is ≥3 months; a comfortable EM sits well above. India runs ~10–11 months (illustrative), which is very comfortable.
- Reserves-to-short-term-external-debt (the Guidotti–Greenspan rule) = reserves ÷ external debt maturing within 12 months. The rule: reserves should cover 100% of it, so a country can survive a year of zero rollover access. India covers its short-term external debt several times over, a direct lesson of 1991 (when reserves fell to ~two weeks of imports and India had to airlift gold to the Bank of England) and of the 2013 scare.
- The IMF ARA metric (Assessing Reserve Adequacy): a composite weighting short-term debt, other portfolio liabilities, broad money, and exports, to capture all the drain channels in a stress. Adequate is 100–150% of the ARA metric. India sits in or above the adequate range.
What are reserves really for?
The strategic point: reserves are not there to be spent defending a level (that is how you lose them, as the Bank of England did in 1992 and many EMs have since). They are there to make an attack not worth trying and to smooth genuine disorder. The buffer is a deterrent and a shock absorber, and its adequacy is the single most important number in judging whether India is externally fragile or robust. It is the centrepiece of the resilience story.