Maturity Gap Analysis in Banks: CAIIB BFM Guide (2026)

Maturity gap analysis is the oldest and most intuitive tool a bank treasury uses to measure how its net interest income reacts to changing interest rates. By slotting every asset and liability into time buckets according to when it reprices or matures, a bank can see — bucket by bucket — whether it earns more or less as rates move. For CAIIB Bank Financial Management candidates, maturity gap analysis is a near-certain scoring topic because it links directly to the RBI Asset-Liability Management framework and to the Interest Rate Sensitivity (IRS) statement every bank files.

Unlike sophisticated market-value techniques, the gap method works purely on the accrual book: it asks a simple question — in each time band, how much of my balance sheet will reprice? The answer drives decisions on lending, deposit pricing and hedging. This guide walks through the calculation, the RBI time buckets, how to read positive and negative gaps, and where treasury and forex exposure fit in.

📊 What Is Maturity Gap Analysis?

Maturity gap analysis, also called the repricing gap model, classifies balance-sheet items as Rate Sensitive Assets (RSA), Rate Sensitive Liabilities (RSL), or non-sensitive items within a defined time horizon. An item is "rate sensitive" if its interest rate will be reset — or the item will mature and be renewed — inside that time bucket. A one-year floating-rate loan linked to the repo-based external benchmark, a 90-day treasury bill, and a maturing bulk deposit are all rate sensitive in the near buckets; equity, cash and fixed assets are not.

The core idea is that when market rates change, interest income from RSA and interest expense on RSL both change, but rarely by the same amount in the same bucket. The mismatch — the "gap" — determines the direction and size of the impact on Net Interest Income (NII). Because the technique focuses on the accrual (earnings) perspective rather than the economic-value perspective, it is quick to build and easy for a branch or treasury manager to interpret. Every bank in India prepares a bucket-wise Interest Rate Sensitivity statement as part of its ALM discipline, making this an examinable, practical skill. For a broader treasury context, revisit the forex case study chapter, which shows how rate and currency mismatches interact on a real balance sheet.

🧮 How to Calculate the Interest Rate Sensitivity Gap

The periodic gap for any time bucket is simply:

Gap = RSA − RSL

where RSA and RSL are the rupee amounts of rate-sensitive assets and liabilities falling in that bucket. A related measure, the Gap Ratio = RSA ÷ RSL, tells you at a glance whether a bucket is asset-sensitive (ratio > 1) or liability-sensitive (ratio < 1). The change in net interest income is estimated as:

ΔNII = Periodic Gap × Δi, where Δi is the change in interest rate (in decimals).

Suppose a bank has ₹500 crore of RSA and ₹400 crore of RSL in the 1–3 month bucket. The gap is +₹100 crore. If rates rise by 1% (0.01), the annualised NII improves by roughly ₹1 crore for that bucket. The cumulative gap — the running total of periodic gaps across buckets — is often more useful because it captures the bank's aggregate sensitivity up to a chosen horizon.

💡 Exam Tip: ΔNII uses the periodic or cumulative gap, not total assets. Multiply the gap by the rate change and by the fraction of the year the position is held, and watch the sign carefully.

Remember that the gap is a point-in-time snapshot. Because loans prepay and deposits roll over, the actual reprising can differ from contractual dates, so behavioural assumptions matter in practice.

🗂️ RBI Time Buckets and the Gap Statement

The RBI ALM guidelines prescribe standard time buckets so that gap statements are consistent across banks. For the Statement of Structural Liquidity and the Interest Rate Sensitivity statement, the revised buckets are: Day 1 (next day); 2–7 days; 8–14 days; 15–28 days; 29 days to 3 months; over 3 months to 6 months; over 6 months to 1 year; over 1 year to 3 years; over 3 years to 5 years; and over 5 years. Slotting every item into the correct bucket is where most exam mistakes happen.

The Interest Rate Sensitivity statement is built from these buckets by placing each RSA and RSL against its repricing date, computing the periodic and cumulative gaps, and comparing them to board-approved tolerance limits. Banks also monitor Earnings at Risk — the potential NII loss from an adverse rate move within the one-year horizon. This bucket discipline mirrors the currency-wise mismatch tracking treasuries use for forex; the exchange rates and forex business chapter explains how the same maturity-ladder logic applies to net open currency positions.

⚠️ Common Mistake: Placing savings and current account (CASA) balances entirely in Day 1. RBI permits behavioural bucketing of core, stable CASA into longer buckets — treating it all as overnight badly distorts the gap.

⚖️ Positive, Negative and Zero Gaps

The sign of the gap tells you how the bank is positioned for rate moves. A positive (asset-sensitive) gap means more assets reprice than liabilities in the bucket, so rising rates lift NII and falling rates hurt it. A negative (liability-sensitive) gap is the reverse: the bank benefits when rates fall. A zero gap means NII is broadly immunised against small rate moves in that bucket.

A treasury deliberately runs a positive gap when it expects rate hikes and a negative gap when it expects cuts — but only within board limits, because a wrong rate call magnifies losses. Gap analysis pairs naturally with capital and market-risk tools; see how buffers are sized in Capital Adequacy and Risk Weighted Assets, and how loss potential is quantified using Value at Risk (VaR). Browse the full Bank Financial Management topic hub for related notes.

🌐 Gap Analysis, Treasury and Forex Exposure

In an integrated treasury, interest-rate gap analysis sits alongside liquidity and currency mismatch management. The same maturity-ladder discipline that produces the rupee gap statement also drives the maturity and position (MAP/NOP) statements for foreign currency, where cross-border flows from trade finance and remittances create their own reprising and rollover risk. A bank funding foreign-currency assets with short-dated swaps, for instance, carries both a currency mismatch and an interest-rate gap that must be read together.

📌 Remember: Gap analysis measures the earnings impact of rate changes. It does not capture the change in the economic value of equity — that needs duration-based or value-at-risk methods, which is why RBI expects banks to run both perspectives.

Cross-border business also connects to arithmetic beyond banking: setting tolerance limits and testing whether a gap breach is statistically significant borrows from inferential statistics. If your averages and confidence intervals feel rusty, the ABM note on hypothesis testing is a useful companion. To drill the numeric side of gap and NII questions, work through problems on iibf.store mock tests and the interactive match-the-concept game.

🧠 Practice MCQs: Maturity Gap Analysis

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❓ Frequently Asked Questions

Maturity gap analysis rewards candidates who can slot items into the right RBI buckets, compute the gap and its ratio, and read the earnings impact correctly. Master the sign convention and the ΔNII formula and this becomes a guaranteed-marks area. Ready to test yourself? Take a full CAIIB BFM practice course and lock in the concept before exam day.