CRD V Art. 73 · EBA GL/2016/10 · ECB SREP · Pillar 2 · Irish Banking

Internal Capital Adequacy
Assessment Process

A comprehensive explainer of the ICAAP — what it is, the inputs that feed it, how they flow through to the final capital adequacy assessment, the ECB's SREP response, and the Irish bank context.

What is the ICAAP?

The Internal Capital Adequacy Assessment Process (ICAAP) is the bank's own assessment of the capital it needs to cover all material risks — not just the minimum Pillar 1 requirement, but the full risk profile including risks not captured or only partially captured by Pillar 1 models. It is the cornerstone of Pillar 2 under the Basel / CRD framework.

The Purpose

Capital Adequacy — From the Inside

The ICAAP asks the board and management to step back from regulatory formulae and answer a fundamental question: given our specific business model, risk profile, strategy, and the economic environment we operate in — how much capital do we actually need? The answer may be more or less than the Pillar 1 minimum, but must be justified with rigour.

The Regulatory Obligation

CRD V Art. 73 — Mandatory

Every CRD-regulated institution must have a robust ICAAP proportionate to its nature, scale and complexity. For ECB-supervised banks (SSM significant institutions), the ICAAP must meet the ECB's specific expectations set out in its ICAAP Guide (2018, updated 2022). The ICAAP is submitted to the ECB annually as a formal supervisory document.

The ECB Response

SREP Sets P2R and P2G

The ECB uses the ICAAP as a primary input to its Supervisory Review and Evaluation Process (SREP). Based on its assessment of the ICAAP quality and the bank's risk profile, the ECB sets the Pillar 2 Requirement (P2R) and Pillar 2 Guidance (P2G) — the binding and non-binding capital add-ons on top of the Pillar 1 minimum. These directly determine the bank's overall capital requirement (OCR) and its distribution capacity.


The Three Pillars — Where ICAAP Sits

PillarWhat It IsWho Determines ItCapital Output
Pillar 1 Minimum capital requirements for credit, market, and operational risk — calculated using prescribed regulatory approaches (SA, IRB, FRTB, OpRisk SA) Prescriptive — determined by regulation. Bank has limited discretion (choice of approach, IRB model parameters) Minimum CET1 4.5% + AT1 1.5% + T2 2% = 8% total. Plus capital conservation buffer (2.5%) and other systemic buffers
Pillar 2 Additional capital for risks not fully captured by Pillar 1 — IRRBB, concentration risk, CSRBB, pension risk, business and strategic risk, model risk. ICAAP drives the Pillar 2 assessment. ECB sets P2R (binding) and P2G (non-binding guidance) based on SREP assessment of the bank's ICAAP and risk profile P2R typically 1–4% CET1 equivalent for Irish pillar banks. P2G an additional buffer recommendation
Pillar 3 Market discipline through public disclosure — banks must publicly disclose their risk profile, capital structure, and capital adequacy metrics to allow market participants to assess them Prescriptive templates (EBA ITS) plus judgment on additional disclosure No direct capital requirement — indirect discipline through market reaction to disclosed risk profile
ICAAP vs. ILAAP The ICAAP has a twin — the Internal Liquidity Adequacy Assessment Process (ILAAP), which performs the equivalent assessment for liquidity risk. Both are submitted to the ECB together as the "ICAAP/ILAAP" package and assessed in parallel in the SREP. The ICAAP covers solvency (can the bank absorb losses?); the ILAAP covers liquidity (can the bank meet its obligations?). They interact — a severe stress scenario may simultaneously impair capital (ICAAP concern) and trigger deposit outflows (ILAAP concern).

The ICAAP Flow — Inputs to Output

The ICAAP is not a single calculation — it is a structured process that integrates multiple risk assessments, stress scenarios, and capital projections into a single forward-looking view of capital adequacy. The diagram below shows how the inputs flow through the process to produce the final capital adequacy conclusion.

Stage 1 — Foundations & Inputs
Business Model & Strategy
3–5 year strategic plan; revenue projections; business mix targets; growth assumptions
Risk Appetite Framework
Board-approved risk appetite; quantitative limits; risk tolerance statements for each material risk
Material Risk Identification
ORSA / risk taxonomy; all material risks identified and ranked; Pillar 1 and Pillar 2 risks catalogued
Macroeconomic Outlook
Base, adverse, and severe adverse macro scenarios; house prices, unemployment, GDP, interest rates
Stage 2 — Pillar 1 Capital Requirements
Credit Risk RWA
IRB models: PD × LGD × EAD → RWA. Output floor applied at 72.5% × SA RWA. IRB Explainer ↗
Market Risk RWA
FRTB SA or IMA — trading book sensitivities, credit spread risk charge, CVA. CSRBB Explainer ↗
Operational Risk RWA
New SA: BIC × ILM. Business indicator plus 10-year loss history. OpRisk Explainer ↗
Pillar 1 Minimum
8% × (Credit + Market + OpRisk RWA) + buffers. CET1 minimum = 4.5% + CCB 2.5% + O-SII/G-SII
Stage 3 — Pillar 2 Risk Quantification
IRRBB Capital
EVE sensitivity under 6 shocks. SOT check (−15% T1). Internal model or standardised approach. IRRBB Explainer ↗
CSRBB Capital
AFS portfolio spread sensitivity. ΔEVE under credit spread shocks. OCI impact on CET1. CSRBB Explainer ↗
Concentration Risk
Single-name, sector, and geographic concentrations beyond Pillar 1 diversification assumptions. Herfindahl index or add-on approach.
Pension Risk
Defined benefit pension deficit sensitivity to interest rates, inflation, and longevity. Sponsor covenant assessment.
Business & Strategic Risk
Revenue volatility; structural earnings risk; execution risk on strategy. Typically quantified via stressed income projections.
Model Risk
Uncertainty in IRB and other models — margins of conservatism, validation findings, MoC add-ons. Capital add-on for model uncertainty.
Stage 4 — Stress Testing
Base Scenario
Central macro forecast. 3-year projection of P&L, RWA, and capital ratios under expected conditions.
Adverse Scenario
Moderate stress — e.g. GDP −2%, unemployment +3pp, house prices −15%. Tests capacity to maintain capital above OCR.
Severe Adverse Scenario
Tail stress — e.g. GDP −5%, unemployment +6pp, house prices −30%. Tests capital adequacy at extreme but plausible conditions.
Reverse Stress Test
Works backwards: what scenario would cause the bank to fail? Identifies vulnerabilities; informs recovery planning.
Stage 5 — Internal Capital Requirement (ICR)
Aggregate Internal Capital Requirement
Sum of Pillar 1 + all quantified Pillar 2 risks. The bank's own view of capital needed under base conditions.
+
Stress Capital Buffer
Additional capital needed to remain above ICR under the adverse scenario. Derived from stress tests in Stage 4.
+
Management Buffer
Discretionary buffer above stressed ICR — ensures ongoing headroom for distributions, growth, and unexpected events.
Stage 6 — ECB Review (SREP)
ECB ICAAP Quality Assessment
ECB rates ICAAP quality (1–4). Deficient ICAAPsresult in higher P2R add-ons.
ECB Risk Assessment
SREP element scores for business model, governance, capital adequacy, liquidity. Each scored 1–4.
P2R Determination
Binding Pillar 2 Requirement set by ECB. At least 56.25% must be met by CET1; at least 75% by Tier 1.
P2G Determination
Non-binding guidance — additional buffer recommended. Breach does not trigger automatic restrictions but informs supervisory dialogue.
Stage 7 — Final Output: Overall Capital Requirement (OCR)
Overall Capital Requirement (OCR)
Pillar 1 minimum + P2R + combined buffer (CCB + O-SII + countercyclical). The binding floor below which CET1 cannot fall without triggering distribution restrictions. Typically 13–16% for Irish pillar banks.
Capital Distribution Capacity
Maximum Distributable Amount (MDA) — the maximum dividends, buybacks, and AT1 coupons permitted. Falls to zero if CET1 breaches the combined buffer requirement.
SREP Decision Letter
Annual ECB letter confirming P2R, P2G, and any qualitative requirements (management actions, model remediation, governance improvements).
The feedback loop The ICAAP is not a one-way process. The ECB's SREP response — particularly qualitative requirements or a high P2R — feeds back into Stage 1 for the following year's ICAAP. If the ECB identifies model risk weaknesses, those must be remediated in the model governance framework before the next cycle. If the P2G indicates the ECB expects higher capital than the bank is holding, the strategic plan (Stage 1) must be revised to include capital build. The ICAAP is therefore an annual cycle with a continuous improvement dynamic.

Risk Inputs — What Feeds the ICAAP

The ICAAP aggregates capital requirements across all material risks — Pillar 1 risks where regulatory models apply, and Pillar 2 risks where the bank must develop its own quantification methodology. The ECB expects all material risks to be captured, with transparent methodology for each.

Material Risk Identification

Before quantifying capital, the bank must identify all material risks. EBA GL/2016/10 requires banks to conduct a comprehensive risk identification exercise — typically through a combination of the risk taxonomy, loss data, RCSA outputs, and management judgment. Risks must be assessed for materiality; those deemed immaterial must be documented with justification.

Risk CategoryPillarQuantification ApproachCapital SourceIrish Bank Relevance
Credit RiskP1IRB (A-IRB or F-IRB) or SA. PD × LGD × EAD formula IRB ExplainerPillar 1 RWA capitalLargest capital driver — mortgage and SME portfolios dominant
Credit Concentration RiskP2Herfindahl index; single-name exposure limits; sector concentration add-ons beyond Pillar 1 model assumptionsPillar 2 add-on to credit RWAIrish banks have geographic concentration (Ireland) and sector concentration (residential property)
Market Risk (trading)P1FRTB SA or IMA. Sensitivity-based method for interest rate, credit spread, FX, equity CSRBB ExplainerPillar 1 market risk RWALimited for Irish retail banks — mainly IRS for client hedging
IRRBBP2EVE and NII sensitivity under 6 standard shocks. Internal model or standardised approach IRRBB ExplainerPillar 2 — P2R if SOT breached or inadequate managementVery high — tracker mortgages, fixed-rate book growth, deposit repricing
CSRBBP2ΔEVE under credit spread shocks. AFS portfolio sensitivity decomposition CSRBB ExplainerPillar 2 — potential P2R if material OCI riskAFS bond portfolios — Irish sovereign and covered bond spread risk
Operational RiskP1New SA: BIC × ILM. Scenario analysis for tail events OpRisk ExplainerPillar 1 OpRisk RWATracker mortgage remediation in 10-year loss history elevates ILM
Conduct RiskP2Scenario analysis — potential future remediation, regulatory fines, litigation. Expert elicitation. May overlap with OpRisk Cat 4.Pillar 2 add-on where ongoing conduct exposure is identifiedOngoing regulatory examination exposure; consumer protection
Pension RiskP2DB pension deficit sensitivity to discount rate, inflation, longevity. Stress: discount rate +/−100bps, inflation +50bps, longevity +2 yearsPillar 2 — capital required to cover stressed pension deficit not already in equityAIB and BOI have material defined benefit pension schemes
Business & Strategic RiskP2Stressed revenue projections — impact of business model disruption, competitive pressure, revenue decline on earnings and retained capitalPillar 2 — implicitly captured in stressed capital projectionsFintech competition; Ulster Bank exit; mortgage market structural change
Model RiskP2Margins of conservatism on IRB models; validation finding adjustments; model sensitivity to parameter uncertaintyPillar 2 — add-on where model uncertainty is materialTRIM findings required significant MoC uplifts at Irish banks
Macroprudential / SystemicP2+buffersO-SII buffer (Other Systemically Important Institution) set by CBI/ECB. Countercyclical capital buffer (CCyB) set by CBICapital buffer requirement — above OCR, not P2RBoth AIB and BOI designated as O-SII; CCyB currently 1.5% in Ireland

Pillar 2 Risk Quantification — Approaches

Analytical / Formula-Based

Where a well-established methodology exists — IRRBB EVE sensitivity, pension deficit stress, concentration Herfindahl — capital is calculated using a defined formula applied to the bank's own data. Transparent and auditable but may not capture tail risks well.

Scenario Analysis

For risks without a standard formula — conduct risk, strategic risk, model risk — capital is estimated using stressed scenarios. Expert judgment calibrates the severity; the difference between the base and stressed capital position provides the P2 capital estimate. OpRisk — Scenario Analysis

Qualitative / Notional

Where risk cannot be reliably quantified, banks may assign a notional allocation based on materiality assessment and comparator analysis — or document why the risk is immaterial. The ECB will challenge thin quantification; all P2 capital must be substantiated.

Stress Testing in the ICAAP

Stress testing is the analytical engine of the ICAAP. It projects how the bank's capital position evolves under adverse conditions — testing whether it can remain above its capital requirements even in severe but plausible scenarios. The ECB places significant weight on stress test credibility, severity, and management actions.

The Scenario Hierarchy

Internal Stress Scenarios

The bank designs its own stress scenarios based on its specific risk profile and vulnerabilities. A good internal scenario is bank-specific — it stresses the factors most relevant to the bank's actual business model rather than generic macro shocks. For an Irish bank, a bank-specific severe scenario might combine a 30% house price fall, ECB rate cut to zero, and a major IT outage simultaneously.

Internal scenarios must be reviewed by the risk function and approved by the Board Risk Committee. The ECB expects them to be genuinely severe — not calibrated to produce comfortable outcomes.

ECB / EBA Supervisory Stress Tests

The EBA runs a system-wide stress test every two years applying a common adverse scenario to all significant institutions. Results are published; banks that perform poorly face increased supervisory scrutiny and potential P2G uplift in the subsequent SREP. The 2023 EBA stress test applied a severe adverse scenario including GDP −6%, house prices −21%, and commercial property −26%.

Supervisory stress test results feed directly into the ECB's SREP calibration — particularly for P2G, which is primarily driven by the capital depletion in the adverse scenario.


What a Stress Test Projects

Starting Balance Sheet

The stress test begins with the bank's current balance sheet — RWA, capital ratios, P&L run-rate, and risk exposures by portfolio. This is the "Day 1" position from which all projections are made.

Macro Scenario Application

The macro scenario (GDP path, unemployment, house prices, interest rates, credit spreads) is applied to the balance sheet through a series of satellite models — each translating macro variables into financial impacts. PiT PD curves rise under adverse macro, driving higher ECL provisions and IRB capital. NII changes with rate paths. CSRBB losses flow through OCI. IFRS 9 — Macro Overlays

P&L and Provision Impact

Higher PDs under the adverse scenario produce higher IFRS 9 ECL provisions — a direct P&L charge reducing retained earnings. NII may fall (ECB rate cut scenario) or remain elevated (rate spike scenario). Operational risk losses may increase. The net result is typically a significant reduction in pre-provision profit and a large increase in impairment charges.

RWA Evolution

As PDs rise under the stress, IRB RWA increases — even before any defaults occur, because risk weights are PD-sensitive. This "RWA inflation" is a double-hit: capital falls (through provisions) and the denominator of the capital ratio also rises, compressing the ratio more than either effect alone would suggest.

Capital Ratio Projection

The year-by-year capital ratio is projected — typically over a 3-year horizon. The minimum capital ratio across the stress horizon is the "stressed CET1 trough". The P2G is calibrated so the bank's CET1 buffer above OCR remains positive even at the stressed trough.

Management Actions

Banks may include management actions in the stress — measures that would be taken in response to stress, such as dividend suspension, balance sheet reduction, or capital raising. The ECB scrutinises management actions carefully — they must be credible, timely, and within the bank's actual capacity to execute. Aggressive or unrealistic management actions are challenged and removed.


Reverse Stress Testing

Working backwards from failure A reverse stress test asks: what combination of events would cause the bank to breach its minimum capital requirement or become unviable? Rather than applying a scenario and observing the impact, the bank defines the failure outcome (e.g. CET1 below Pillar 1 minimum) and works backwards to identify the scenario severity that would produce it. This forces explicit acknowledgment of the bank's breaking point — and the management actions that could prevent it. Reverse stress tests are a regulatory requirement under CRD V and EBA guidelines, and feed directly into recovery plan trigger calibration.

Capital Adequacy Assessment & the Capital Stack

The ICAAP's capital adequacy conclusion compares available capital (what the bank actually holds) against required capital (the sum of all Pillar 1 and Pillar 2 requirements plus buffers). The gap between them — the capital headroom — determines the bank's distribution capacity and strategic flexibility.

The Capital Stack — Layer by Layer

Each layer of the capital requirement must be met by the appropriate quality of capital. The stack builds from the lowest (most permanent) capital upward.

Pillar 1 min CET1
4.50%
AT1 (Pillar 1)
1.50%
T2 (Pillar 1)
2.00%
P2R — CET1 portion
~1.50%*
P2R — AT1/T2 portion
~1.00%*
CCB (Capital Conservation)
2.50%
O-SII Buffer
0.50–1.50%
CCyB (variable)
1.50% (IE)
P2G (guidance — non-binding)
~1.50%*
Management buffer
bank discretion

* Indicative figures for illustrative purposes. P2R is bank-specific and confidential. CCyB = Irish rate as at 2024.

The MDA trigger — what really matters for distributions The Maximum Distributable Amount (MDA) restriction triggers when CET1 falls below the combined buffer requirement — specifically below Pillar 1 CET1 minimum (4.5%) + P2R CET1 portion + CCB (2.5%) + O-SII buffer + CCyB. Below this level, dividends, AT1 coupons, and discretionary staff bonuses are automatically restricted. For Irish pillar banks with combined buffer requirements of ~7–8% above the Pillar 1 minimum, the MDA trigger typically sits around 11–12% CET1.

Interactive Capital Adequacy Calculator

Credit Risk RWA (€bn)
€28bn
Market + OpRisk RWA (€bn)
€7bn
P2R (% of RWA)
2.50% of RWA
Combined Buffer (CCB + O-SII + CCyB)
5.50% of RWA
P2G (% of RWA)
1.50% guidance
Actual CET1 Ratio (%)
14.50%
Total RWA
€35bn
Pillar 1 CET1 Requirement
4.50%
Minimum CET1
P2R CET1 Component (56.25%)
1.41%
= P2R × 56.25%
OCR (binding minimum)
12.41%
P1 + P2R CET1 + combined buffer
MDA Trigger
12.41%
Below this — distributions restricted
Headroom above OCR
+2.09%
Available for distributions / growth
Headroom above OCR + P2G
+0.59%
Thin — ECB expects positive headroom vs P2G too
Capital Stack — Requirements vs. Actual CET1

SREP — The ECB's Response to the ICAAP

The Supervisory Review and Evaluation Process (SREP) is the ECB's annual assessment of each significant institution. It consumes the ICAAP as its primary input and produces the P2R and P2G — the Pillar 2 capital add-ons that determine the bank's overall capital requirement for the coming year.

The SREP Framework

The ECB's SREP assesses four elements, each scored on a 1–4 scale (1 = no material concerns; 4 = high risk / critical concerns). The aggregate SREP score drives the overall supervisory stance and P2R calibration.

Element A — Business Model Analysis

Assessment of the viability and sustainability of the business model — can the bank generate adequate returns to sustain its capital base? Considers competitive position, revenue diversification, cost efficiency (CIR), and strategic plan credibility. A bank with a structurally loss-making business model receives a high score (worse) regardless of its current capital position.

Element B — Internal Governance & Risk Management

Assessment of governance quality — board effectiveness, three lines of defence, risk culture, ICAAP and ILAAP quality. A weak ICAAP — thin quantification, inadequate stress testing, poor documentation, or failure to capture material risks — directly feeds into a higher SREP score and therefore a higher P2R. This is why ICAAP quality investment has a direct capital benefit.

Element C — Capital Adequacy (SREP Capital)

Assessment of capital adequacy under both normal and stressed conditions. Draws directly on the ICAAP — the ECB compares its own assessment of required capital against the bank's ICAAP conclusion. Where the ECB's view of required capital exceeds the bank's own assessment, the gap drives P2R upward. Stress test results (EBA adverse scenario) primarily drive P2G calibration.

Element D — Liquidity Adequacy (SREP Liquidity)

Assessment of liquidity adequacy — based on the ILAAP. Considers LCR, NSFR, survival horizon under stress, and funding structure stability. Liquidity findings may generate Pillar 2 liquidity add-ons (specific liquidity requirements) rather than capital charges, though severe liquidity vulnerabilities can indirectly increase P2R capital requirements.


P2R — Pillar 2 Requirement

The P2R is a binding, institution-specific capital requirement set by the ECB in the SREP decision. It is confidential — not published — but the total OCR (which embeds P2R) can be inferred from distribution restrictions and public statements.

FeatureDetail
Binding?Yes — binding from the date of the SREP decision letter. Breach triggers automatic MDA restrictions and potential supervisory measures.
Capital compositionAt least 56.25% of P2R must be met by CET1; at least 75% by Tier 1 capital. The remaining 25% can be Tier 2. This is the CRD V composition rule (the "Danish compromise" extension).
What drives P2R?SREP element scores; ICAAP quality; specific risk quantifications (IRRBB, concentration, pension); EBA stress test results; qualitative risk assessment for risks without standard methodologies.
Typical range (Irish banks)Approximately 2.0–3.5% of RWA for the Irish pillar banks — reflecting material IRRBB, conduct risk legacy, and concentration in Irish property markets. Specific figures are confidential.
Can it change?Yes — the ECB resets P2R annually in the SREP. A bank that significantly improves its ICAAP quality, reduces IRRBB sensitivity, or resolves major conduct exposures can see P2R reduced. Deterioration in risk profile increases it.

P2G — Pillar 2 Guidance

Non-binding but consequential P2G is the ECB's recommendation for an additional capital buffer above the binding OCR — primarily calibrated from the EBA stress test adverse scenario capital depletion. Unlike P2R, breach of P2G does not automatically trigger MDA restrictions. However, a bank operating below P2G is expected to have a credible capital build plan and must proactively engage with its JST. Sustained operation below P2G will eventually translate into supervisory action — a P2G breach that persists signals the bank may not be able to absorb stress, which the ECB will reflect in the next SREP P2R. Distribution decisions (dividends, buybacks) are closely scrutinised relative to P2G headroom.

ICAAP Governance

The ECB places as much weight on ICAAP governance as on ICAAP quantification. A technically sophisticated capital model embedded in a governance framework where the board does not meaningfully engage with the output will receive a poor SREP score. The "use test" — evidence that the ICAAP genuinely informs decision-making — is a core ECB expectation.

Board and Senior Management Responsibilities

BodyICAAP ResponsibilityMinimum Standard
Board of DirectorsApprove the ICAAP document and key assumptions; approve the risk appetite; confirm capital adequacy conclusion; challenge stress test scenarios; sign-off on submission to ECBBoard must actively engage — not rubber-stamp. ECB inspectors interview non-executive directors to test genuine understanding. Risk committee deep-dive mandatory.
Board Risk CommitteeReview and challenge ICAAP methodology; review risk quantification for each material risk; assess stress test design and results; recommend ICAAP approval to the full boardAt least two sessions per year dedicated to ICAAP review. Minutes must show substantive challenge, not just approval.
CEO / CFO / CROCEO and CFO accountable for business model and strategic plan inputs. CRO responsible for risk identification and quantification. All three sign the ICAAP attestation letter to the ECB.Management attestation is a formal supervisory requirement — personal accountability for ICAAP quality is explicit under CBI IAF / SEAR.
Risk & Finance FunctionsBuild and maintain ICAAP infrastructure — models, data, scenarios, capital projections. Provide independent risk quantification. Challenge business assumptions in capital projections.ICAAP team must have adequate resources and seniority. The ECB specifically assesses whether the ICAAP has sufficient investment — underfunded ICAAP teams are a governance finding.

The Use Test — Making ICAAP Outputs Matter

The ECB's use test — what it looks for The use test requires evidence that ICAAP outputs are integrated into real business decisions — not just produced for the regulator and then filed. Evidence the ECB expects to see includes: capital allocation to business units based on ICAAP risk estimates; strategic plan decisions that reflect capital adequacy constraints identified in the ICAAP; stress test outcomes that have influenced dividend or buyback decisions; risk appetite limits that are calibrated to ICAAP capital thresholds; and management information packs that reference ICAAP metrics in monthly reporting. Where the ICAAP is disconnected from how the bank actually runs itself, this is a governance finding that directly inflates P2R.

ICAAP Annual Cycle

MonthActivityOwner
Jan–FebSREP decision letter received for prior year. P2R and P2G confirmed. Qualitative requirements noted. New ICAAP cycle planning begins.CRO / CFO; Board Risk Committee informed
Mar–AprRisk identification and materiality assessment updated. Business plan / strategic plan confirmed for stress test base scenario. Macro scenarios designed and approved.Risk function; Strategy / Finance; ORCC
May–JulPillar 1 RWA projections updated. Pillar 2 risk quantifications refreshed (IRRBB, CSRBB, pension, concentration). Stress tests run under all scenarios.Risk function; Capital management; Treasury
Aug–SepICAAP document drafted. Internal validation / peer review. Capital adequacy conclusion drafted. Management actions documented where applicable.Capital team; second-line validation; Legal
OctBoard Risk Committee review and challenge. Board approval. Management attestation letters signed.Board; CEO; CFO; CRO
NovICAAP submitted to ECB Joint Supervisory Team. Accompanying letter from CEO/CRO/CFO.CRO; JST relationship management
Dec–JanECB review and dialogue. Requests for clarification or supplementary analysis. SREP preparation begins. Cycle recommences.CRO; ECB JST

Worked Example — Irish Pillar Bank ICAAP

An illustrative ICAAP capital adequacy assessment for a hypothetical large Irish retail bank — showing how Pillar 1 and Pillar 2 risk quantifications aggregate to an internal capital requirement, how stress testing identifies the capital buffer needed, and how the SREP conclusion compares.

Assumptions — illustrative onlyAll figures are hypothetical. Designed to be representative of an Irish pillar bank's order of magnitude, not to replicate any specific institution.

Step 1 — Starting Position

Total RWA
€35bn
Credit €27bn + Market €2bn + OpRisk €6bn
CET1 Capital
€5.1bn
14.6% CET1 ratio
Total Capital
€6.3bn
18.0% total capital ratio
Net Interest Income
€1.4bn
Annual run-rate

Step 2 — Pillar 1 Capital Requirements

ComponentRWAP1 Min (8%)CET1 Required (4.5%)
Credit Risk (A-IRB + output floor)€27.0bn€2,160m€1,215m
Market Risk (FRTB SA)€2.0bn€160m€90m
Operational Risk (New SA)€6.0bn€480m€270m
Total Pillar 1€35.0bn€2,800m€1,575m (4.50%)

Step 3 — Pillar 2 Risk Quantification

Pillar 2 RiskCapital Required (€m)% of RWAMethodology
IRRBB — EVE sensitivity4201.20%Parallel up scenario ΔEVE = −€1,050m; 40% capitalised IRRBB Explainer
Credit concentration risk2800.80%Irish property concentration add-on (Herfindahl approach); single-name excess
CSRBB — AFS portfolio1750.50%+150bps spread shock on €5bn AFS portfolio; duration 4.5yr → €337m; 52% capitalised CSRBB Explainer
Operational risk (P2 add-on)1050.30%Conduct risk scenario (future remediation probability); cyber tail scenario
Pension risk1400.40%Stressed DB deficit: −100bps discount rate shock → €350m deficit increase; 40% not offset by P&L hedges
Model risk1050.30%Margin of conservatism on IRB PD models; 5% uplift to credit RWA × 8% capital ratio
Business & strategic risk700.20%Revenue stress under competitive scenario; structural NII decline
Total Pillar 21,2953.70%Sum of all Pillar 2 quantifications

Step 4 — Internal Capital Requirement and Stress

Pillar 1 CET1 requirement
4.50%
Pillar 2 (internal view)
3.70%
Internal Capital Requirement
8.20%
P1 + P2 before buffers
Combined Buffer
5.50%
CCB 2.5% + O-SII 1.5% + CCyB 1.5%
ScenarioCET1 Trough (3yr)vs. OCR (binding)vs. OCR + P2GConclusion
Base14.6% → 15.2%+2.8%+1.3%Comfortable — capital builds through retained earnings
Adverse (GDP −2%, HPI −15%)14.6% → 12.1%+0.3%−1.2%Below P2G at trough — ECB expects P2G headroom; focus of SREP dialogue
Severe adverse (GDP −5%, HPI −30%)14.6% → 9.8%−2.0%−3.5%Breach of OCR at trough — management actions required (dividend suspension + portfolio disposal)
The adverse scenario P2G breach drives P2G calibration The adverse scenario showing a trough 1.2% below OCR + P2G is the primary input to the ECB's P2G calibration. The ECB will set P2G at approximately the size of the capital depletion in the adverse scenario — i.e. a P2G of around 1.5% would ensure the bank remains above OCR at the trough. This illustrates directly why P2G tracks adverse stress test results.

Step 5 — SREP Outcome

P2R (ECB binding)
2.50%
Confidential; total capital composition requirement also set
P2G (ECB guidance)
1.50%
Adverse scenario depletion; non-binding but distribution-sensitive
OCR (binding CET1 minimum)
11.91%
4.5% + P2R CET1 (1.41%) + combined buffer (5.50% × CET1 portion 100%)

Irish Bank Context

The ICAAP has taken on greater importance for Irish banks following the post-crisis period — the ECB's increased supervisory intensity through TRIM, targeted model reviews, and deep SREP dialogue has raised the standard required of Irish bank ICAAPas significantly since 2015.

Key ICAAP Challenges for Irish Banks

Property Concentration Risk

Irish banks have extreme geographic and sector concentration — predominantly lending to Irish borrowers secured on Irish property. The Pillar 1 IRB model assumes a diversified portfolio; Irish banks must hold a material Pillar 2 concentration add-on to reflect that actual losses in a severe Irish property downturn (2008–2012: −55% peak-to-trough for residential, worse for commercial) would far exceed the diversified loss assumption embedded in the ASRF formula underlying IRB capital. IRB Explainer — Capital Formula

IRRBB — Tracker Mortgage Complexity

The tracker mortgage book creates a distinctive IRRBB profile that requires careful ICAAP treatment — the EVE impact (negative under rate rises due to long fixed-rate mortgage book) and the NII impact (positive under rate rises due to tracker book) pull in opposite directions. Quantifying the net capital requirement requires full cashflow modelling across decades of remaining mortgage maturities, with careful treatment of the contractual floor on tracker rates at ECB MRR + margin. IRRBB Explainer

Conduct Risk Legacy

The tracker mortgage scandal, PPI mis-selling, and ongoing CBI examination activity mean Irish banks must hold Pillar 2 capital for forward-looking conduct risk — the probability of future remediation programmes or regulatory fines from exposures not yet identified. Quantifying this is highly judgmental; scenario analysis based on the quantum and trajectory of current examination activity is the primary methodology. The ECB has focused on ensuring Irish banks' conduct risk P2 capital is not systematically underestimated. OpRisk Explainer — Loss Categories

Output Floor Transition

The CRR III output floor phases in between 2025 and 2030 — progressively increasing Pillar 1 credit RWA for Irish mortgage books where A-IRB models produce risk weights well below the SA floor. The ICAAP must model the multi-year RWA trajectory as the floor ratchets up, project the capital implications, and demonstrate the bank's capital plan absorbs the headwind without breaching OCR. AIB and BOI have publicly quantified this as a several-billion-euro RWA headwind phasing over five years. IRB Explainer — Output Floor


The ECB's ICAAP Expectations — Evolution Since 2018

AreaECB Expectation (2018 Guide)Evolution to Present
ProportionalityICAAP must be proportionate to bank's nature, scale, complexityECB has raised expectations for all SSM banks — even smaller SIs face more granular ICAAP requirements. The ECB has signalled that "simple" ICAAPsare no longer acceptable for banks with material Pillar 2 risks.
Stress severityStress scenarios must be severe but plausiblePost-COVID and post-2022 rate cycle, the ECB expects stress scenarios calibrated to recent observed stress — scenarios that do not include a 2022-style rate shock are now considered insufficiently severe for Irish banks.
IRRBB / CSRBB integrationIRRBB capital must be quantified and reflected in P2R discussionCRR III Art. 84 now explicitly requires CSRBB to be separately identified and reported. ECB expects IRRBB and CSRBB to be separately decomposed in the ICAAP rather than reported as a combined sensitivity.
Capital distribution governanceICAAP should inform distribution decisionsECB now explicitly links ICAAP stress test results to distribution capacity. Banks are expected to model MDA trigger proximity under adverse scenarios before confirming dividend or buyback programmes.
Climate riskNot explicitly required in 2018 GuideECB now expects climate risk to be integrated into the ICAAP — both transition risk (carbon price scenarios) and physical risk (flood, heat stress on collateral). Irish banks face physical risk through collateral exposed to coastal flooding and transition risk through energy-inefficient mortgage portfolios.

Bank Profiles — ICAAP Focus Areas

AIB Group

AIB's ICAAP is dominated by the interaction between its large tracker book (IRRBB), its AFS sovereign portfolio (CSRBB), the output floor transition on its mortgage book (Pillar 1 headwind), and legacy conduct risk from the tracker examination. AIB discloses its OCR and CET1 headroom explicitly and calibrates dividends and buybacks against P2G proximity — demonstrating the direct use test link between ICAAP outputs and distribution decisions.

Bank of Ireland

BOI's ICAAP spans two regulatory jurisdictions (ECB/SSM and PRA) — a complexity that requires consolidated and solo ICAAPs running in parallel with different stress scenarios. The PRA's concurrent stress test (UK equivalent of EBA stress test) and the ECB's SREP may produce different P2G conclusions, requiring a consolidated view of the binding constraint. BOI's UK mortgage book adds cross-currency IRRBB and CSRBB that must be separately modelled and aggregated.

PTSB

PTSB's ICAAP is focused on managing a rapid balance sheet transformation — the 2023 Ulster Bank acquisition materially changed PTSB's risk profile, requiring a significant ICAAP refresh. Integration risk (Pillar 2 operational), the inherited mortgage portfolio characteristics, and the tracker book concentration are the dominant themes. PTSB's smaller capital base makes P2G headroom management proportionally more complex — a 1% P2G is a larger relative constraint for PTSB than for its larger peers.

Balance Sheet Scenario Analyser

Interactive scenario analysis based on AIB Group's FY 2025 actual balance sheet. Adjust the macro and balance sheet parameters to see how NII, ECL provisions, CET1 ratio, and overall capital headroom respond. This is a simplified but structurally accurate model — the same type of analysis that feeds an ICAAP stress test.

Base case — AIB Group FY 2025 Actuals Total assets €148.2bn · Net loans €71.2bn · Investment securities €21.5bn · Loans to banks/CBI €48.5bn · Customer deposits €117.2bn · NII €3,748m · NIM 2.73% · CET1 16.2% · ECB deposit rate base assumed 2.00% · Deposit beta ~20%. Source: AIB Group Annual Financial Results, December 2025.

Balance Sheet — Base Case (€bn)

Assets — €148.2bn
Liabilities & Equity — €148.2bn

Scenario Parameters

ECB Deposit Rate (%)
2.00% vs base 2.00%
Key driver of tracker NII and deposit cost
Loan Book Growth (%)
+3.0%
AIB guidance: ~3% in 2025; 5% CAGR 2025–2027
Deposit Pass-Through / Beta (%)
20% deposit pass-through
AIB FY 2025 actual: ~20%; higher beta = more NII erosion on rate cuts
Irish House Price Change (%)
0% house prices
Drives LGD and ECL on €37bn+ Irish mortgage book
Credit Spread Shock (bps)
0 bps credit spread
Impacts AFS portfolio (€21.5bn, ~4.5yr duration) via OCI → CET1
GDP Growth (%)
2.5% GDP growth
Drives PD and ECL across all portfolios; AIB base ~2.5%
Scenario NII
€3.75bn
FY 2025 base: €3.75bn
ΔNII vs Base
+€0m
Rate + volume + beta effects
Net Interest Margin
2.73%
Base: 2.73% (Q4 exit: 2.69%)
ECL Charge
€1.1bn
Base ECL allowance: €1.1bn
AFS OCI Impact
€0m
CSRBB → direct CET1 reduction
Scenario RWA
€74.7bn
Base: €74.7bn (CET1 16.2%)
Scenario CET1 Ratio
16.2%
Base: 16.2% (Dec 2025 actual)
Headroom above OCR
+4.2%
Comfortable headroom
Gross Loans
€72.3bn
Base: €72.3bn
Customer Deposits
€117.2bn
Base: €117.2bn
Total Assets (est.)
€148.2bn
Base: €148.2bn
NIM Sensitivity disclosed
−€378m per −100bps
AIB disclosed Dec 2025 NII −100bps sensitivity
NII · ECL · CET1 — Base vs. Scenario

Key Balance Sheet Sensitivities — Guidance from AIB FY 2025

ParameterAIB Disclosed SensitivityDirectionModelled Mechanism
ECB rate −100bps−€378m NIINegative — tracker book reprices down immediately; partially offset by deposit cost reliefTracker (€10.5bn × −1%) + partial variable + CBI deposit (€48.5bn × −0.85%) − deposit savings (€117bn × 20% beta × −1%)
Deposit beta 20%Base assumptionEach 10pp increase in beta costs ~€117m additional NII per 100bps of ECB moveHigher beta = more deposit cost passed to customers; critical for NII in rate-cut environment
Loan growth +1%~+€30m NIIPositive — new loans at current market rates (~4.5% approx.) generate incremental interest income€72bn × 1% growth × 4.5% yield × (1-tax) = after-tax retained earnings add to CET1
House prices −10%Indirect via ECLNegative — worsens LGD on €37bn+ Irish mortgage book; stage migrations increase ECL provisionsHPI drives LGD in IFRS 9 downside scenario; also affects IRB RWA indirectly over time
Credit spread +100bps on AFS~−€970m OCINegative direct CET1 hit — €21.5bn × 4.5yr duration × 1% ≈ €970m unrealised OCI lossAFS bonds FVOCI — spread widening flows directly to AOCI and reduces CET1 without P&L
GDP −1pp below base~+€80–120m ECLNegative — lower GDP increases macro PiT PD estimates across all portfoliosIFRS 9 macro overlay: scenario weights shift toward downside; PiT PD rises; stage migrations increase
Model caveats This analyser uses simplified linear approximations of AIB's actual balance sheet sensitivities. Real ICAAP models use full cashflow projections, non-linear ECL behaviour, dynamic RWA evolution, and management action overlays. The NII sensitivities are broadly calibrated to AIB's disclosed −100bps NII sensitivity of −€378m (Dec 2025). ECL and RWA responses are illustrative order-of-magnitude estimates. This tool is designed to demonstrate how balance sheet parameters interact — not to replicate AIB's internal models.

ICAAP Reference Data Pipeline

The ICAAP is assembled from data flowing through a chain of models and processing steps — each with defined inputs, transformations, and outputs. Click any stage below to explore its inputs, models/processing steps, and outputs in detail.

How to use this Each row is a pipeline stage. Click to expand and see: the Inputs (source data feeding this stage), the Models & Processing (what transforms the data), and the Outputs (what this stage produces for downstream stages). Outputs from one stage become inputs to the next.