Open market operations are the Reserve Bank of India’s most flexible and market-friendly tool for managing durable liquidity in the banking system. When the RBI buys government securities from the secondary market, rupees flow out of the central bank into bank balance sheets — system liquidity expands. When the RBI sells government securities, liquidity is sucked out. Unlike the crr cash reserve ratio, which is a blunt statutory pre-emption, open market operations work through the price mechanism: a willing seller, a willing buyer, a market-determined yield. The OMO toolkit has expanded dramatically since 2008, encompassing outright purchases and sales, simultaneous switch operations (Operation Twist), the standing forex sterilisation function, and the now-routine bond-switch and buy-back operations conducted under the OMO calendar.
What Open Market Operations Are
Open market operations refer to the central bank’s purchase or sale of government securities in the secondary debt market for monetary policy and liquidity management purposes. The legal authority flows from Section 17(8) of the RBI Act, 1934, which empowers the Bank to deal in government paper. The RBI conducts open market operations through multi-price or uniform-price auctions on its E-Kuber platform, in which primary dealers and banks submit yield-based bids.
The defining features of open market operations are three:
- Durable, not transient: Unlike LAF repos which reverse the next day, an outright OMO purchase permanently expands the RBI’s balance sheet — and the corresponding rupee liquidity — until the bond matures or is sold back.
- Price-based, not quantity-based: The market discovers the yield at which liquidity is exchanged; the RBI sets the quantum on offer.
- Universally market-friendly: Because OMOs work through voluntary auctions, they avoid the distortions that statutory tools like CRR impose on bank balance sheets.
OMO Purchases: Injecting Liquidity
When the RBI judges that the banking system faces a durable liquidity deficit — a situation where banks consistently borrow from the LAF rather than parking surplus — it announces an OMO purchase auction. The mechanics are clean:
- The RBI notifies a basket of G-sec ISINs available for purchase and a total notified amount, typically ₹20,000–40,000 crore per auction.
- Primary dealers and banks submit yield bids electronically.
- The RBI accepts the lowest yields (highest prices) up to the notified amount.
- Settlement is T+1; rupees move into the seller bank’s RBI account, G-secs move to the RBI’s investment book.
The result: durable rupee liquidity expands by the auction size, the RBI’s holdings of G-secs rise, and yields on the purchased tenors typically ease 5–15 bps post-auction. The 2020-21 pandemic period saw cumulative OMO purchases of over ₹3 lakh crore, supporting the unprecedented government borrowing programme without destabilising yields.
OMO Sales: Absorbing Liquidity
The reverse operation absorbs liquidity. When the system runs a durable surplus — for example after heavy forex intervention by the RBI — OMO sales are announced. The mechanism mirrors purchases: bids are submitted, the RBI accepts the highest yields (lowest prices), and rupees flow back to the central bank.
OMO sales were used heavily between 2010 and 2014 to manage the liquidity surplus generated by capital inflows. In September 2023 the RBI signalled, for the first time in nearly a decade, the possibility of OMO sales to absorb post-GST-settlement surpluses — though the operation was ultimately not conducted as system liquidity tightened on its own.
Sterilisation: The Forex–OMO Linkage
Open market operations are the principal instrument of sterilised intervention in the forex market. When the RBI buys dollars to prevent excessive rupee appreciation, it pays in rupees, expanding domestic liquidity. If unchecked, this can fuel inflation and undermine the monetary policy committee targets. To neutralise the monetary impact, the RBI simultaneously sells G-secs through OMO, withdrawing the rupees it just injected.
This sterilisation arithmetic is central to India’s exchange-rate management:
- Dollar purchase → rupee injection
- OMO sale → rupee absorption
- Net monetary impact: neutral; net forex reserves: higher
The cost of sterilisation — the spread between the yield on G-secs sold and the return on incremental forex reserves — is the “quasi-fiscal cost” of forex management that the RBI absorbs on its balance sheet.
The Market Stabilisation Scheme
When sterilisation needs exceed the RBI’s available stock of G-secs, the Market Stabilisation Scheme (MSS) is activated. Launched in 2004 under a memorandum of understanding with the Centre, MSS allows the Government to issue special Treasury Bills and dated securities exclusively for the purpose of absorbing liquidity. The proceeds are sterilised in a separate cash account with the RBI. MSS was deployed extensively in 2007–08 during the capital-inflow surge and again briefly in November 2016 post-demonetisation.
The OMO Calendar
Since 2020–21 the RBI has moved towards a calendar-based OMO regime, publishing the schedule of switch operations and outright auctions in advance. The G-sec calendar published twice a year by the Government in consultation with the RBI now contains explicit OMO and buy-back windows. This calendarisation has reduced market surprise, improved primary dealer participation, and made OMOs a planning input for the Centre’s debt manager.
The calendar typically signals:
- Quarterly OMO purchase/sale windows based on durable-liquidity projections.
- Switch operations to extend the average maturity of the Centre’s debt without net new borrowing.
- Buy-backs of nearing-maturity G-secs to smooth redemption pressure.
Operation Twist: Twisting the Yield Curve
Operation Twist is a special class of OMO in which the RBI simultaneously buys long-dated G-secs and sells short-dated G-secs of equal value. The net liquidity impact is zero — rupees absorbed at the short end equal rupees released at the long end — but the shape of the yield curve is twisted: long yields fall, short yields rise.
The RBI first conducted Operation Twist in December 2019, modelled on the Federal Reserve’s 2011 twist programme, to compress the steep term premium that had emerged in the 10-year G-sec yield. Five rounds were conducted between December 2019 and April 2020, each of ₹10,000 crore on each side. The 10-year G-sec yield fell by nearly 50 bps as a direct consequence.
Operation Twist is particularly valuable when the central bank wants to support long-term borrowing costs — and through them, corporate bond yields and home-loan rates linked to G-sec benchmarks — without expanding base money. The architecture of Indian bond market depth and liquidity, as discussed in developing corporate bond market in india and bond yields, is reinforced by predictable twist operations.
OMO vs Liquidity Adjustment Facility
The most common UPSC confusion is between OMOs and the Liquidity Adjustment Facility (LAF). Both manage liquidity; everything else is different.
| Feature | OMO | LAF (Repo / Reverse Repo / SDF) |
|---|---|---|
| Tenor | Outright, permanent until matured | Overnight to 14-day |
| Instrument | Outright purchase/sale of G-secs | Collateralised lending/borrowing |
| Balance sheet impact | RBI’s investment book changes | RBI’s net lending/borrowing position changes |
| Liquidity type | Durable | Transient / frictional |
| Trigger | Persistent structural surplus/deficit | Day-to-day funding mismatches |
| Rate determination | Market auction yield | Policy rate (repo) or corridor floor (SDF) |
| Conducted under | Section 17(8) RBI Act | Liquidity Adjustment Facility framework |
The simple rule of thumb: LAF manages the flow of daily liquidity; OMO manages the stock of durable liquidity. A repo cut by the monetary policy committee lowers the price of overnight money; an OMO purchase changes the quantity of money permanently. Both must work in coordination — a repo cut unsupported by adequate durable liquidity will fail to transmit, and OMO injections without rate alignment will distort the corridor.
Recent OMO Activity
The 2024–25 cycle saw a meaningful return of OMO purchases:
- January–March 2025: ₹2.6 lakh crore of OMO purchases announced in a calibrated programme to address the durable liquidity deficit that had emerged from heavy GST-settlement-driven government cash balances.
- August 2025: Switch operations of ₹50,000 crore to flatten the curve ahead of the festival borrowing window.
- October 2025: OMOs scaled back as the CRR cut delivered durable liquidity infusion.
This sequence illustrates the calibration: the RBI uses OMOs surgically when liquidity stress is observable and reaches for the CRR when a larger, structural infusion is needed.
Limitations of OMOs
Three caveats matter for GS-III answers:
- Fiscal–monetary linkage: Heavy OMO purchases effectively monetise government debt, complicating the FRBM and fiscal deficit india discipline.
- Market depth: OMOs work only if the secondary G-sec market is deep enough to absorb large auctions without volatile yield moves.
- Signalling ambiguity: Aggressive OMO purchases can be read as a dovish bias even when the MPC is on hold, blurring the monetary policy signal.
Frequently Asked Questions
What are open market operations?
Open market operations are the purchase or sale of government securities by the RBI in the secondary market to manage durable liquidity in the banking system, conducted under Section 17(8) of the RBI Act, 1934.
How do OMOs differ from repo operations?
OMOs are outright, permanent transactions in G-secs; LAF repos are short-tenor collateralised lending operations that reverse within one to fourteen days. OMOs change the stock of liquidity; LAF manages the flow.
What is sterilisation?
Sterilisation is the neutralisation of the domestic monetary impact of forex intervention. When the RBI buys dollars and creates rupee liquidity, it simultaneously sells G-secs through OMO to absorb that liquidity.
What is Operation Twist?
A simultaneous OMO purchase of long-dated G-secs and sale of short-dated G-secs of equal value, designed to flatten the yield curve without changing net liquidity. India first used Operation Twist in December 2019.
What is the Market Stabilisation Scheme?
The MSS, launched in 2004, allows the Government to issue special securities exclusively to absorb liquidity when the RBI’s own G-sec stock is insufficient for sterilisation. Proceeds are held in a separate cash account.
Does the RBI publish an OMO calendar?
Yes. Since 2020-21 the RBI publishes a calendar of OMO purchase, sale, switch and buy-back operations in coordination with the Government’s market borrowing calendar, reducing surprise and improving market participation.
Can OMOs replace CRR changes?
Not entirely. OMOs are tactical and reversible; CRR changes are statutory and structural. The RBI uses OMOs for calibrated short-term liquidity tilts and CRR moves for large, durable infusions or withdrawals.
How do OMOs affect bond yields?
OMO purchases compress yields on the tenors bought (especially the 10-year benchmark), and OMO sales push yields up. Twist operations selectively flatten or steepen the curve depending on which tenors are bought and sold.
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