Cash-Flow Gaps, Concentration Measures and Liquidity Ratios - Article

Introduction

Liquidity-risk measurement converts a bank's future cash receipts and payments into information that management can use.

A bank needs to know:

• how much cash is expected to come in;

• how much cash is expected to go out;

• when those cash flows will occur;

• whether negative gaps are concentrated in short periods;

• whether funding depends excessively on particular sources; and

• whether the bank has sufficient short-term and stable long-term liquidity.

The current 2026 IIBF BFM syllabus includes liquidity-risk measurement and management, liquidity-risk monitoring tools, the Liquidity Coverage Ratio and the Net Stable Funding Ratio.

The main numerical concepts can be grouped into three areas:

1. Cash-flow gaps and cumulative mismatches

2. Funding-concentration measures

3. Liquidity ratios such as LCR and NSFR

For CAIIB, calculation and interpretation are equally important.

A numerical answer may show a negative gap or a ratio above 100%, but the learner should also understand what that result means for the bank's liquidity position.

Learning Objectives

After studying this topic, you should be able to:

• understand cash inflows and cash outflows;

• distinguish a periodic gap from a cumulative gap;

• interpret positive and negative liquidity gaps;

• understand RBI's short-term cumulative mismatch limits;

• identify concentration by counterparty, product and currency;

• understand the purpose of LCR;

• understand the purpose of NSFR;

• distinguish short-term liquidity adequacy from structural funding stability; and

• avoid common CAIIB numerical interpretation errors.

Cash-Flow Gap Analysis

Liquidity gap analysis places expected cash inflows and cash outflows into specified time buckets according to when they are expected to occur.

Examples of inflows include:

• loan repayments;

• investment maturities;

• interest receipts;

• maturing interbank placements; and

• other contractual receipts.

Examples of outflows include:

• deposit withdrawals or maturities;

• borrowing repayments;

• loan disbursements;

• payment obligations;

• contingent commitments; and

• other contractual payments.

The objective is to determine whether the bank has sufficient liquidity in each period.

Periodic Liquidity Gap

Liquidity Gap = Cash Inflows − Cash Outflows

This shows whether inflows exceed or fall short of outflows in a particular time bucket.

Refer to the Formula Section for a detailed explanation, variables, and solved examples.

Positive Gap

A positive gap means expected inflows exceed expected outflows in that bucket.

It generally indicates a liquidity surplus for that period.

Negative Gap

A negative gap means expected outflows exceed expected inflows.

It indicates that the bank needs liquidity from:

• existing liquid assets;

• fresh funding;

• maturing investments;

• borrowing; or

• another available source.

Cumulative Liquidity Gap

A bank should not examine each time bucket independently.

A surplus from one earlier bucket may help absorb a later deficit, while repeated deficits can accumulate.

Cumulative Gap = Cumulative Cash Inflows − Cumulative Cash Outflows

This shows the overall liquidity surplus or deficit accumulated up to a particular time horizon.

Refer to the Formula Section for a detailed explanation, variables, and solved examples.

Why Cumulative Gap Matters

Suppose:

• one bucket has a small surplus;

• the next bucket has a large deficit; and

• the third bucket has another deficit.

Looking only at individual gaps may hide the growing liquidity shortage.

The cumulative position gives management a clearer view of the bank's funding requirement over time.

RBI Structural Liquidity Approach

RBI requires banks to monitor cash flows through the structural liquidity framework and establish Board/Risk Management Committee-approved prudential limits.

For the short-term buckets, RBI specifies that net cumulative negative mismatches should not exceed the following percentages of cumulative cash outflows:

These limits apply to the relevant short-term structural liquidity buckets under RBI's liquidity-risk framework.

Cumulative Negative Mismatch Ratio = |Cumulative Negative Mismatch| ÷ Cumulative Cash Outflows × 100

This ratio indicates whether the cumulative deficit remains within the applicable RBI tolerance for the relevant short-term bucket.

Refer to the Formula Section for a detailed explanation, variables, and solved examples.

Interpretation of the RBI Limits

If a calculated cumulative negative mismatch ratio:

• remains within the applicable limit → it satisfies that specific mismatch tolerance;

• exceeds the applicable limit → the position requires corrective attention under the liquidity framework.

However, being within the regulatory limit does not automatically mean the bank has no liquidity risk.

Management must also consider:

• funding concentration;

• market access;

• collateral;

• stress conditions;

• foreign-currency requirements; and

• contingent outflows.

Contractual vs Behavioural Cash Flows

Not every banking cash flow occurs strictly according to contractual maturity.

For example:

• some savings deposits may remain with the bank for long periods;

• some term deposits may be withdrawn early;

• some loans may be prepaid;

• undrawn credit facilities may suddenly be utilised.

Basel therefore expects banks to use prospective cash-flow forecasts and realistic assumptions about behavioural responses of customers and counterparties.

For CAIIB, distinguish:

Contractual Maturity

Based on the legally agreed payment date.

Behavioural Maturity

Based on expected customer or counterparty behaviour.

This distinction is important because liquidity risk depends on actual expected cash behaviour, not only contractual dates.

Funding-Concentration Measures

Liquidity can appear adequate in total while still being fragile because too much funding comes from one source.

Basel's liquidity-monitoring framework therefore includes concentration measures covering:

• significant counterparties;

• significant funding instruments or products; and

• significant currencies.

Counterparty Concentration

Counterparty Funding Concentration = Funding Liabilities from Significant Counterparty ÷ Total Liabilities × 100

This measures the bank's dependence on a particular significant funding counterparty or connected group.

Refer to the Formula Section for a detailed explanation, variables, and solved examples.

Basel defines a significant counterparty for this monitoring metric as a single counterparty or connected/affiliated group accounting for more than 1% of the bank's total balance sheet, subject to supervisory considerations.

Interpretation

A higher concentration means withdrawal of that counterparty's funding could have a greater liquidity impact.

The percentage is therefore a monitoring measure, not a statement that every exposure above 1% is automatically unacceptable.

Product or Instrument Concentration

A bank may obtain funding from many counterparties but still depend heavily on one instrument.

Examples include excessive dependence on:

• certificates of deposit;

• short-term wholesale deposits;

• unsecured market borrowing; or

• one particular debt instrument.

Basel's monitoring framework considers an instrument or group of similar instruments significant when it exceeds 1% of the bank's total balance sheet.

The purpose is to identify situations where disruption of one funding product could materially affect liquidity.

Important CAIIB Distinction

Many counterparties do not necessarily mean good diversification.

A bank could have:

• 100 counterparties;

• all providing overnight unsecured funds.

Counterparty concentration may appear low, but tenor and instrument concentration remain high.

Significant Currency Concentration

Liquidity must also be considered across currencies.

Basel defines a currency as significant for the concentration monitoring metric where liabilities denominated in that currency amount to 5% or more of total liabilities.

RBI also uses the 5% threshold for identifying significant currencies in liquidity monitoring.

Why This Matters

A bank may have:

• surplus INR liquidity; but

• insufficient USD liquidity.

If foreign-exchange or swap markets become stressed, the rupee surplus may not be easily converted into the required foreign currency.

Therefore:

Overall liquidity surplus ≠ adequate liquidity in every significant currency

Liquidity Coverage Ratio — LCR

The LCR is designed to strengthen a bank's short-term liquidity resilience.

Basel requires banks to hold sufficient High-Quality Liquid Assets (HQLA) to withstand a significant stress scenario lasting 30 calendar days.

LCR = Stock of High-Quality Liquid Assets ÷ Total Net Cash Outflows over the Next 30 Calendar Days × 100

The ratio compares the bank's available HQLA with stressed net cash outflows over a 30-day horizon.

Refer to the Formula Section for a detailed explanation, variables, and solved examples.

Minimum Requirement

Basel requires LCR to be at least 100% on an ongoing basis in normal circumstances.

RBI's current regulatory handbook states that applicable commercial banks in India are required to maintain a minimum 100% LCR on an ongoing basis, both at standalone and consolidated levels.

Interpretation

LCR ≥ 100%

The stock of HQLA is at least equal to the regulatory stressed net cash outflows over the next 30 days.

LCR < 100%

HQLA is below that benchmark.

However, Basel expressly recognises that banks may use their HQLA during periods of actual liquidity stress, which can cause LCR to fall below 100%; supervisory response depends on the circumstances.

LCR Net Cash Outflows

Under the Basel LCR framework, expected inflows cannot completely offset expected outflows.

Cash inflows are generally capped at 75% of total expected cash outflows, ensuring that the bank maintains a minimum HQLA buffer rather than depending entirely on expected receipts.

Total Net Cash Outflows = Total Expected Cash Outflows − Minimum of [Total Expected Cash Inflows, 75% of Total Expected Cash Outflows]

This prevents excessive reliance on expected cash inflows when determining the 30-day stressed liquidity requirement.

Refer to the Formula Section for a detailed explanation, variables, and solved examples.

What Is HQLA?

HQLA are assets expected to remain sufficiently liquid during stress and capable of being converted into cash with little or no significant loss of value, subject to the applicable regulatory criteria.

For numerical questions, students may be given different categories of liquid assets and applicable regulatory treatment.

The article should focus on the concept:

HQLA forms the numerator of LCR.

Detailed asset-level eligibility, haircuts and calculations should be handled in the separate Formula Section.

Net Stable Funding Ratio — NSFR

LCR focuses mainly on 30-day liquidity stress.

NSFR addresses the longer-term structure of funding.

Basel states that NSFR seeks to reduce overreliance on short-term wholesale funding and requires banks to maintain a stable funding profile relative to their assets and off-balance-sheet activities.

NSFR = Available Stable Funding ÷ Required Stable Funding × 100

This ratio compares funding expected to remain reliable with the stable funding required by the bank's assets and off-balance-sheet exposures.

Refer to the Formula Section for a detailed explanation, variables, and solved examples.

Minimum Requirement

Basel requires NSFR to be at least 100% on an ongoing basis.

RBI's current regulatory handbook also requires applicable commercial banks to maintain a minimum 100% NSFR on an ongoing basis, at standalone and consolidated levels.

Available Stable Funding and Required Stable Funding

Available Stable Funding — ASF

ASF represents the portion of capital and liabilities expected to remain reliable over the one-year NSFR horizon.

Funding stability is influenced by characteristics such as:

• maturity;

• type of funding; and

• counterparty.

Basel generally treats longer-term liabilities as more stable than short-term liabilities and retail/small-business deposits as behaviourally more stable than similar-maturity wholesale funding.

Required Stable Funding — RSF

RSF reflects the amount of stable funding required for:

• assets; and

• off-balance-sheet exposures,

based on characteristics such as:

• liquidity;

• residual maturity; and

• funding requirement.

A long-term illiquid asset generally requires more stable funding than a highly liquid short-term asset.

LCR vs NSFR

Why One Liquidity Measure Is Not Enough

A bank may have:

• LCR above 100%; but

• excessive long-term reliance on unstable funding.

NSFR helps identify this structural weakness.

Another bank may have:

• NSFR above 100%; but

• a severe cash deficit tomorrow.

Short-term gap analysis and LCR remain important.

A third bank may satisfy both regulatory ratios but depend heavily on:

• one wholesale depositor; or

• one foreign currency.

Concentration measures are then necessary.

Therefore:

Gap Analysis + Concentration Monitoring + LCR + NSFR

provide different and complementary views of liquidity risk.

Numerical Interpretation Sequence

For CAIIB numerical questions, use the following sequence.

For Cash-Flow Gaps

1. Identify the correct time bucket.

2. Separate inflows and outflows.

3. Determine the periodic gap.

4. Build the cumulative position.

5. If cumulative position is negative, compare the mismatch ratio with the applicable tolerance.

6. Interpret whether the deficit is within the relevant limit.

For Concentration

1. Identify the funding source.

2. Identify the appropriate denominator.

3. Determine the concentration percentage.

4. Check whether the question refers to Basel monitoring significance or the bank's internal limit.

5. Interpret the dependence on that funding source.

For LCR

1. Identify eligible HQLA.

2. Determine stressed cash outflows.

3. Determine eligible inflows subject to applicable rules.

4. Determine net cash outflows.

5. Calculate LCR.

6. Compare with the 100% benchmark.

For NSFR

1. Determine Available Stable Funding.

2. Determine Required Stable Funding.

3. Calculate NSFR.

4. Compare with the 100% benchmark.

CAIIB Exam Focus

Remember these high-value points:

• A liquidity gap is calculated for a specific time bucket.

• Positive gap means inflows exceed outflows.

• Negative gap means outflows exceed inflows.

• A negative gap does not automatically mean insolvency or liquidity failure.

• Cumulative gap considers the combined position up to that time bucket.

• RBI's short-term structural-liquidity limits apply to net cumulative negative mismatches.

• The limits are 5%, 10%, 15% and 20% for the Next Day, 2–7 Days, 8–14 Days and 15–28 Days buckets respectively.

• Cash-flow assumptions may be contractual or behavioural.

• Funding concentration should be examined by counterparty, instrument/product and currency.

• Basel's monitoring metric treats a counterparty or instrument/product above 1% of the bank's total balance sheet as significant for this purpose.

• A currency is significant where liabilities in that currency are 5% or more of total liabilities.

• These significance thresholds are monitoring thresholds, not universal maximum concentration limits.

• LCR measures short-term resilience over a 30-day stress horizon.

• HQLA forms the numerator of LCR.

• Basel caps recognised LCR inflows generally at 75% of expected outflows.

• LCR minimum is 100% under normal ongoing conditions.

• NSFR addresses structural funding stability over a one-year horizon.

• NSFR minimum is 100%.

• RBI currently requires applicable commercial banks to maintain both LCR and NSFR at a minimum of 100% on an ongoing basis.

• LCR and NSFR address different dimensions of liquidity.

• Compliance with one liquidity measure does not guarantee compliance with another.

Common Exam Traps

Trap 1: “A negative periodic gap always means the bank has violated RBI's liquidity limit.”

Incorrect. The relevant RBI short-term limits relate to the net cumulative negative mismatch relative to cumulative cash outflows.

Trap 2: “A positive gap in one bucket guarantees an overall liquidity surplus.”

Incorrect. Later buckets may create larger deficits.

Trap 3: “The 20% mismatch limit applies to every maturity bucket.”

Incorrect. RBI's short-term tolerance increases across the specified buckets from 5% to 20%.

Trap 4: “A significant funding counterparty under Basel means funding from that counterparty is prohibited.”

Incorrect. The threshold identifies concentration for monitoring.

Trap 5: “A bank with many funding counterparties cannot have concentration risk.”

Incorrect. Concentration can also arise by instrument, maturity or currency.

Trap 6: “LCR and NSFR are interchangeable.”

Incorrect. LCR focuses on 30-day liquidity resilience; NSFR focuses on one-year stable funding.

Trap 7: “LCR above 100% means the bank can never experience liquidity stress.”

Incorrect. It is a regulatory liquidity measure, not a guarantee against every possible stress.

Trap 8: “Expected cash inflows can always fully offset LCR cash outflows.”

Incorrect. Basel generally caps recognised inflows at 75% of expected outflows.

Trap 9: “NSFR measures the size of the bank's HQLA buffer.”

Incorrect. HQLA is central to LCR. NSFR compares Available Stable Funding with Required Stable Funding.

Trap 10: “If LCR and NSFR are above 100%, funding concentration can be ignored.”

Incorrect. Concentration is a separate dimension of liquidity risk and must still be monitored.

Memory Technique

Remember G–C–L–N:

G — Gap: When do cash inflows and outflows occur? C — Concentration: Where does funding come from? L — LCR: Can the bank withstand 30-day liquidity stress? N — NSFR: Is funding sufficiently stable over one year?

For RBI short-term mismatch limits, remember:

5 – 10 – 15 – 20

corresponding to:

Next Day → 2–7 Days → 8–14 Days → 15–28 Days

The central CAIIB principle is:

Liquidity cannot be understood from one ratio alone; timing, concentration, short-term resilience and structural funding stability must all be assessed together.