LAF Corridor Explained: Repo, SDF & MSF for CAIIB Central Banking

The LAF corridor sits at the heart of the Reserve Bank of India's day-to-day liquidity management, and it is one of the most exam-relevant topics in the CAIIB Central Banking (CB) elective. For bankers preparing for the paper, understanding how the LAF corridor works — and how it links the repo rate, the SDF, and the MSF — turns abstract monetary policy into something concrete you can answer questions on. This article breaks down the framework as it stands in 2026.

What the LAF corridor actually is

The LAF corridor is the band within which the RBI keeps short-term money market interest rates, especially the weighted average call rate (WACR), which is the operating target of monetary policy. The Liquidity Adjustment Facility (LAF) is the toolkit through which the central bank injects or absorbs overnight liquidity from the banking system, and the "corridor" is simply the floor-to-ceiling spread around the policy repo rate.

The corridor has three reference rates:

• Policy repo rate — the central, anchoring rate at which the RBI lends overnight funds to banks against government securities.
• Standing Deposit Facility (SDF) rate — the floor of the corridor, set 25 basis points below the repo rate, at which banks park surplus funds with the RBI without receiving collateral.
• Marginal Standing Facility (MSF) rate — the ceiling, set 25 basis points above the repo rate, at which banks borrow emergency overnight funds.

Because the SDF and MSF are symmetric around the repo rate, the corridor width is normally 50 basis points. The idea is that no bank should need to lend in the market below the SDF (it could just park with the RBI) or borrow above the MSF (it could borrow from the RBI), so market rates stay boxed inside the band. Mastering this structure is foundational for the CAIIB Central Banking elective.

The current corridor and policy rates in 2026

As of 2026, the corridor remains a symmetric 50-basis-point band built around the policy repo rate. The Monetary Policy Committee (MPC) sets the repo rate, and the SDF and MSF rates move mechanically with it: SDF at repo minus 25 bps, MSF at repo plus 25 bps. The Bank Rate is aligned with the MSF rate.

Rather than memorising a number that changes after every policy review, candidates should focus on the relationships and always confirm the live figures before an exam attempt. The LAF corridor structure stays constant even when the absolute rate level shifts:

• SDF = Repo − 0.25% (corridor floor)
• MSF = Repo + 0.25% (corridor ceiling)
• Bank Rate = MSF rate

The Cash Reserve Ratio (CRR) and Statutory Liquidity Ratio (SLR) sit alongside the corridor but are not part of it — they are reserve requirements, not lending/absorption rates. You can track the latest repo, SDF, MSF, CRR and SLR figures on the constantly updated RBI rates resource, which is the safest single source to revise from before the CB paper. For breaking policy developments, the IIBF news feed is also worth a scan.

How the RBI operates within the corridor

The corridor is not a passive band — the RBI actively conducts operations to keep the WACR near the repo rate. Since the framework was refined, the RBI has emphasised a flexible, demand-driven approach using both fixed-rate and variable-rate operations.

Variable rate repo and reverse repo

The main fine-tuning tools are Variable Rate Repo (VRR) auctions, which inject liquidity when the system is in deficit, and Variable Rate Reverse Repo (VRRR) auctions, which absorb surplus liquidity. These are conducted at market-determined rates within the corridor, of varying tenors (overnight to several days), depending on the RBI's read of durable versus frictional liquidity needs.

Standing facilities

The SDF and MSF are standing facilities — available on demand at the bank's initiative, every day, without auction. The SDF replaced the fixed-rate reverse repo as the floor in 2022, and crucially it is uncollateralised, freeing up government securities for banks.

Durable liquidity tools

For longer-lasting liquidity adjustments, the RBI uses Open Market Operations (OMO) in G-Secs, foreign exchange swaps, and changes to the CRR. To test your grasp of these mechanics, try the timed CAIIB mock tests, which include scenario-based liquidity questions.

Why the LAF corridor matters for monetary transmission

The whole point of the corridor is monetary policy transmission — ensuring that a change in the repo rate actually flows through to deposit rates, lending rates, and ultimately to inflation and growth. A narrow, well-anchored corridor reduces volatility in overnight rates, which gives banks a stable reference for pricing loans linked to external benchmarks.

Key transmission points to understand:

• Operating target: The WACR is what the RBI steers; keeping it close to the repo rate signals a "neutral" liquidity stance.
• Stance signalling: When the RBI pushes the WACR toward the SDF (floor), it is effectively easing; pushing it toward the MSF (ceiling) tightens conditions.
• External benchmark lending: Many retail and MSME loans are linked to the repo rate, so corridor discipline directly affects borrowers' EMIs.

For the CB elective, expect questions linking the corridor to inflation targeting — the RBI operates under a flexible inflation targeting (FIT) mandate of 4% CPI inflation with a +/- 2% tolerance band. The corridor is the operational machinery that delivers on that target. Reinforce these linkages with the match-the-concept game, which pairs each tool with its function, and browse related explainers on the iibf.store blog.

The MPC: who sets the rate the corridor is built on

The repo rate that anchors the LAF corridor is decided by the Monetary Policy Committee, a statutory six-member body created under the amended RBI Act, 1934. Understanding its composition is a reliable exam scorer.

• Three RBI members: the Governor (Chairperson, with a casting vote in a tie), a Deputy Governor in charge of monetary policy, and one officer of the RBI nominated by the Central Board.
• Three external members: appointed by the Central Government, typically economists or academics, who serve a fixed term and bring an independent perspective.

Decisions are taken by a majority vote, and the MPC meets at least four times a year (in practice, six bi-monthly meetings). The minutes and each member's vote are published, supporting transparency and accountability. The committee's overriding legal objective is to maintain price stability while keeping in mind the objective of growth — codified as the 4% (+/- 2%) CPI inflation target reviewed every five years. Because the corridor mechanically follows the repo rate the MPC sets, every CAIIB candidate should know both the MPC structure and the corridor logic together as one connected system.

For authoritative guidance, refer to the official resources of the Reserve Bank of India and the Indian Institute of Banking & Finance.

Frequently Asked Questions

Conclusion: lock in your LAF corridor marks

The LAF corridor ties together almost every Central Banking concept — the repo rate, the SDF and MSF standing facilities, liquidity operations, the MPC, and inflation targeting — into one testable framework. Master the relationships rather than chasing changing numbers, and confirm the live rates before your attempt. Ready to test yourself? Attempt the CAIIB practice tests on liquidity and monetary policy, or revise the full syllabus through the CAIIB Central Banking course and walk into the exam confident.