Introduction
Some banks are more important to the financial system than others.
If a small bank faces difficulty, the impact may remain relatively contained.
However, failure of a very large, interconnected or difficult-to-replace bank can disrupt:
deposit and credit markets;
payment systems;
other financial institutions;
financial markets; and
the wider economy.
Such institutions are treated as systemically important.
The current IIBF CAIIB BFM Module B expressly includes Systemically Important Financial Institutions (SIFIs) and Risk Based Supervision (RBS) under Risk Regulations in Banking Industry. The examination can also include case studies and caselets.
For banking purposes:
SIFI is the broader concept of a systemically important financial institution.
SIB means a systemically important bank.
D-SIB means a Domestic Systemically Important Bank.
G-SIB means a Global Systemically Important Bank.
The central idea is:
The greater the damage that a bank’s failure could cause, the stronger the need for additional resilience and supervisory attention.
Learning Objectives
After studying this topic, you should be able to:
explain why some banks are classified as systemically important;
distinguish D-SIB classification from ordinary bank-risk assessment;
understand RBI’s D-SIB buckets and additional CET1 requirements;
explain Risk-Based Supervision and SPARC;
analyse cases involving probability and impact of bank failure; and
connect systemic importance with capital and supervisory intensity.
What Makes a Bank Systemically Important?
A bank is not classified as systemically important merely because it is profitable or financially strong.
The important question is:
What would happen to the financial system if this bank became distressed or failed?
The Basel D-SIB framework therefore focuses primarily on the impact of failure, rather than simply the probability that the bank will fail.
Important factors include:
Size
Interconnectedness
Substitutability or financial-infrastructure importance
Complexity
RBI uses these four broad indicators in its D-SIB assessment framework. Its 2023 review retained the selected indicators and their respective weights while updating parts of the measurement methodology.
Size
A very large bank may have:
large deposits;
extensive loans;
major market positions; and
a wide customer base.
Its failure could therefore affect a large part of the economy.
But size alone is not the complete test.
Interconnectedness
Banks transact extensively with:
other banks;
NBFCs;
financial markets;
clearing institutions; and
institutional counterparties.
Failure of a highly interconnected bank may transmit stress to several other institutions.
Substitutability
Some banking services may be difficult to replace quickly.
Examples can include substantial participation in:
payments;
custody;
clearing;
market infrastructure; or
important financial services.
RBI’s revised methodology updated the payments sub-indicator within substitutability to use the value and volume of digital payments.
Complexity
A complex bank may have:
multiple subsidiaries;
derivatives;
securities activities;
cross-border operations; and
complicated financial structures.
Complexity can make distress or resolution more difficult.
Current RBI D-SIB Position
As of September 2026, the latest published RBI D-SIB list is the 2025 list issued on 2 December 2025.
RBI continues to identify three Indian banks as D-SIBs:
Bucket | Bank | Additional CET1 as % of RWA |
|---|---|---|
5 | — | 1.00% |
4 | State Bank of India | 0.80% |
3 | — | 0.60% |
2 | HDFC Bank | 0.40% |
1 | ICICI Bank | 0.20% |
The additional CET1 requirement is over and above the Capital Conservation Buffer. The 2025 assessment used bank data as at 31 March 2025.
RBI’s revised methodology provides for annual assessment using end-March data, with the assessment process generally taking place later in the year.
D-SIB Additional Capital
Additional D-SIB CET1 Requirement = RWA × Applicable D-SIB Surcharge
This calculates the additional CET1 amount arising from the bank’s D-SIB bucket.
Refer to the Formula Section for a detailed explanation, variables, and solved examples.
The higher loss-absorbency requirement is maintained in Common Equity Tier 1, the highest-quality regulatory capital. Basel also requires D-SIB higher loss absorbency to be met fully with CET1.
Case 1: Very Large Bank but Strong Financial Position
Bank Alpha has:
excellent profitability;
strong asset quality;
comfortable capital;
a very large deposit base;
major payment-system activity; and
extensive connections with other financial institutions.
A learner argues:
“The bank is financially strong, so it cannot be systemically important.”
Analysis
The conclusion is incorrect.
Systemic importance does not mean the bank is weak.
The question is primarily about the consequences of distress or failure.
Because Bank Alpha is:
large;
interconnected; and
difficult to replace,
its failure could create severe disruption even if its present probability of failure is low.
CAIIB Lesson
Distinguish:
Financial weakness → probability-of-failure issue
from
Systemic importance → impact-of-failure issue
A financially sound bank can still be a D-SIB.
Case 2: Small Risk of Failure but Massive Potential Impact
Bank Beta has excellent governance and capital.
Its probability of failure is assessed as low.
However, it provides a major share of critical banking and payment services.
Should systemic importance be ignored because failure is unlikely?
Analysis
No.
Basel’s D-SIB approach specifically emphasises the potential impact of failure.
A low probability of failure does not eliminate the possibility of severe consequences if failure eventually occurs.
This is why systemically important banks are required to maintain greater resilience.
Case 3: SBI and Additional CET1
A case states that State Bank of India:
satisfies the normal RBI minimum capital requirements; and
maintains the full Capital Conservation Buffer.
The learner concludes that no further CET1 requirement applies.
Analysis
Incorrect.
Under RBI’s current 2025 D-SIB list, SBI is in Bucket 4 and carries an additional CET1 requirement of 0.80% of RWA.
This requirement is in addition to the Capital Conservation Buffer.
The same logic applies to:
HDFC Bank: 0.40%; and
ICICI Bank: 0.20%.
CAIIB Lesson
Always check whether the bank is a D-SIB before concluding that its ordinary minimum capital plus CCB represents the complete requirement.
Case 4: Bank Moves to a Higher D-SIB Bucket
Assume a D-SIB becomes more systemically important because of substantial growth in:
size;
interconnectedness;
payments activity; and
complexity.
Its systemic-importance score moves it into a higher bucket.
What is the regulatory logic?
Analysis
A higher bucket can lead to a higher additional CET1 requirement.
The surcharge is intended to provide greater loss-absorbing capacity where the consequences of failure would be more serious.
Basel requires higher loss absorbency for D-SIBs to be commensurate with their systemic importance.
This does not mean:
“The higher bucket bank is necessarily more likely to fail.”
It means:
“Its failure could have greater systemic consequences.”
What Is Risk-Based Supervision?
D-SIB classification answers:
How significant would the bank’s failure be to the financial system?
Risk-Based Supervision asks a broader question:
What risks does the bank face, how well are they controlled, and how intensively should it be supervised?
RBI describes RBS as an ongoing process in which the risks of a bank are assessed and an appropriate supervisory plan is designed.
RBI implemented the risk-based supervisory approach for commercial banks from 2013 onwards in a phased manner. RBI’s framework is known as SPARC – Supervisory Program for Assessment of Risk and Capital.
What SPARC Looks At
The framework considers areas such as:
inherent risk;
effectiveness of controls;
governance and oversight;
available capital;
emerging risks;
probability of failure; and
impact of failure.
RBI states that SPARC considers both risk of failure and impact of failure when determining the supervisory stance or intensity.
This creates an important link between:
RBS; and
systemic importance.
Case 5: Two Banks with the Same CRAR
Bank X and Bank Y have the same CRAR.
However:
Bank X
diversified portfolio;
stable funding;
effective controls;
low operational losses;
strong governance.
Bank Y
rapid unsecured growth;
sector concentration;
weak controls;
unstable funding;
repeated operational incidents.
Should both banks receive identical supervisory attention?
Analysis
No.
A risk-based approach does not rely only on a single capital ratio.
Bank Y has greater:
inherent risk;
control weakness; and
potential vulnerability.
It therefore warrants greater supervisory focus even though its reported CRAR is presently the same as Bank X.
RBI identifies differentiated supervision according to risk profile as a key objective of SPARC.
Case 6: Strong Controls against High Inherent Risk
A bank operates a large derivatives and treasury business.
Its inherent market and counterparty risks are high.
However, it has:
strong limits;
independent risk management;
robust valuation;
effective monitoring; and
strong Board oversight.
Analysis
RBS considers both:
inherent risk; and
quality of risk controls.
Strong controls can reduce residual supervisory concern, but they do not make the underlying activity risk-free.
The supervisor must continue to assess whether the controls remain appropriate for the scale and complexity of business.
CAIIB Lesson
Do not assess a bank only from:
the volume of risky business; or
the existence of controls.
Both must be considered together.
Case 7: D-SIB with Good Controls
A D-SIB has:
low current probability of failure;
strong capital;
excellent controls; and
strong risk governance.
Should its systemic importance now be ignored in deciding supervisory attention?
Analysis
No.
Under SPARC, supervisory stance considers both:
risk/probability of failure; and
impact of failure.
Because a D-SIB can cause major disruption if it fails, systemic impact remains relevant even when current controls are strong.
Basel also notes that more intensive supervision is an important policy tool for dealing with D-SIBs in addition to higher loss absorbency.
Case 8: Critical Digital-Payments Provider
A bank expands rapidly in digital payments.
Its services become important to a large number of customers and institutions.
A prolonged system outage could disrupt a significant part of the domestic payment ecosystem.
Analysis
This case involves more than ordinary technology risk.
At the bank level, the outage creates:
operational risk;
cyber/technology risk;
reputational risk; and
possibly liquidity effects.
At the system level, the bank’s importance in payment services can also affect its substitutability/systemic significance.
RBI’s revised D-SIB methodology specifically updated the payments measure within the substitutability indicator to capture digital-payment value and volume.
This illustrates how:
Operational risk at one institution can become systemic risk when the institution is sufficiently important.
Case 9: Foreign G-SIB Operating in India
A foreign banking group is identified internationally as a G-SIB and operates branches in India.
A learner argues:
“Only Indian D-SIB rules matter for its Indian operations.”
Analysis
That is incomplete.
RBI specifies that where a foreign bank with branches in India is a G-SIB, it must maintain an additional CET1 surcharge in India proportionate to its Indian RWA according to the prescribed approach.
Therefore:
D-SIB relates to domestic systemic importance;
G-SIB relates to global systemic importance.
The frameworks are related but not identical.
“Too Big to Fail” – Correct Interpretation
D-SIBs are sometimes informally called “too big to fail” institutions.
This expression can be misleading if interpreted literally.
It does not mean:
the bank can never fail;
depositors or investors are guaranteed against every loss; or
Government rescue is automatically promised.
The purpose of the systemic-bank framework is precisely to reduce:
probability of failure;
impact of failure;
moral hazard; and
wider financial disruption.
RBI’s original D-SIB framework arose from lessons of the global financial crisis, when distress at large interconnected institutions generated major financial-system consequences and public-sector intervention created moral-hazard concerns.
D-SIB Framework vs Risk-Based Supervision
Basis | D-SIB Framework | Risk-Based Supervision |
|---|---|---|
Main Question | How damaging could failure be? | What risks exist and how should supervision respond? |
Primary Focus | Systemic importance | Risk profile and supervisory stance |
Important Dimensions | Size, interconnectedness, substitutability, complexity | Inherent risks, controls, governance, capital, failure risk and impact |
Capital Impact | Additional CET1 based on bucket | May influence supervisory capital/action |
RBI Framework | D-SIB assessment | SPARC |
Key Nature | Systemic-impact framework | Forward-looking supervisory framework |
The two frameworks complement each other.
A systemically important bank can require:
higher loss-absorbing capital; and
stronger supervisory attention.
Practical Banking Application
Consider a large bank showing rapid growth in:
unsecured lending;
digital payments;
wholesale funding;
interbank transactions; and
derivatives.
A sound regulatory and supervisory assessment should not ask only:
“Is its CRAR above the minimum?”
It should consider:
What are the bank’s material inherent risks?
Are governance and controls effective?
Is capital sufficient for the risk profile?
Could emerging risks materially increase its probability of failure?
How large would the impact of failure be?
Is the bank systemically important?
Does an additional D-SIB CET1 requirement apply?
Should supervisory intensity increase?
This is the practical connection among:
Risk Profile → Capital → Systemic Importance → Supervisory Stance
CAIIB Exam Focus
Remember these high-value concepts:
IIBF specifically includes SIFIs and RBS in BFM Module B.
D-SIB means Domestic Systemically Important Bank.
D-SIB assessment focuses primarily on the impact of failure, not merely probability of failure.
RBI uses size, interconnectedness, substitutability and complexity as broad systemic-importance indicators.
RBI revised parts of its D-SIB assessment methodology in December 2023 without changing the selected indicators or their weights.
The current 2025 RBI D-SIB list contains SBI, HDFC Bank and ICICI Bank.
SBI is in Bucket 4 with 0.80% additional CET1.
HDFC Bank is in Bucket 2 with 0.40%.
ICICI Bank is in Bucket 1 with 0.20%.
D-SIB additional capital is over and above the CCB.
D-SIB higher loss absorbency is maintained in CET1.
RBI’s RBS framework is called SPARC.
SPARC means Supervisory Program for Assessment of Risk and Capital.
RBI implemented RBS for commercial banks from 2013 onwards in a phased manner.
RBS is forward-looking and risk-focused.
SPARC supports differentiated supervisory intensity.
RBS considers both the risk of failure and impact of failure.
Systemically important institutions may require greater supervisory attention even when their current probability of failure is low.
For the December 2026 CAIIB cycle, IIBF’s published regulatory cut-off is 30 June 2026; the RBI 2025 D-SIB list issued in December 2025 therefore falls within that cut-off.
Common Exam Traps
Trap 1: “D-SIB Means the Bank Is Financially Weak”
Incorrect.
D-SIB classification primarily reflects systemic importance, not a prediction that the bank will fail.
Trap 2: “Only Size Determines D-SIB Status”
Incorrect.
RBI also considers interconnectedness, substitutability and complexity.
Trap 3: “D-SIB Additional CET1 Is Part of the Normal CCB”
Incorrect.
The D-SIB surcharge is additional to the CCB.
Trap 4: “All D-SIBs Maintain the Same Additional CET1”
Incorrect.
The requirement depends on the bank’s D-SIB bucket.
Trap 5: “Higher D-SIB Bucket Means Higher Probability of Failure”
Incorrect.
The bucket relates to systemic importance. A higher bucket mainly reflects greater potential systemic impact.
Trap 6: “RBS Means Compliance Checking Is Abandoned”
Incorrect.
RBS remains concerned with compliance, but gives greater emphasis to material risks, controls, emerging vulnerabilities and forward-looking supervision.
Trap 7: “Same CRAR Means Same Supervisory Risk”
Incorrect.
Two banks with the same CRAR can have very different inherent risks, controls and systemic importance.
Trap 8: “‘Too Big to Fail’ Means Government Rescue Is Guaranteed”
Incorrect.
The regulatory objective is to increase resilience and reduce systemic damage, not promise automatic rescue.
Memory Technique
Remember D-SIB assessment as S-I-S-C:
S – Size
I – Interconnectedness
S – Substitutability
C – Complexity
For RBS, remember:
Risk of Failure + Impact of Failure = Supervisory Stance