Biggest CRR3 impact on COREP
The output floor. It can increase RWAs and reduce capital ratios even without business changes, so COREP must clearly show standardized RWAs, internal-model RWAs, and the floor adjustment.
Biggest CRR3 impacts on COREP (memorise)
🔹 Output Floor (MOST IMPORTANT)
Internal model RWAs ≥ 72.5% of Standardised RWAs
Applied at consolidated level
Drives capital ratios even if risk profile is unchanged
COREP impact:
New fields / templates showing:
RWAs before floor
Standardised RWAs
Output floor add-on
🔹 Credit Risk
Revised Standardised Approach
IRB restrictions + PD/LGD floors
COREP impact:
More granular exposure classes
Changes in RWA drivers
Clear IRB vs SA distinction
🔹 Market Risk
FRTB SA / IMA
COREP impact:
New / revised market risk templates
Higher granularity & reconciliation effort
🔹 Operational Risk
Single Standardised Measurement Approach (SMA)
COREP impact:
New op risk template
BI & loss component reporting
COREP Common Validation Rules
COREP is validated automatically before submission. Core checks ensure internal consistency.
RWA totals must reconcile across CA and CR templates.
Defaulted exposures must match regulatory default definition.
Leverage exposure must reconcile to BS + model EAD.
No negative or missing PD/LGD/EAD/CCF values.
Exposure class breakdowns must match across templates.
Output floor adjustments must be fully traceable.
Liquidity inflows/outflows must balance and respect caps.
COREP Common Validation Rules (Interview explanation)
COREP has strict automated checks. Most important ones are:
RWA consistency — RWA totals must match capital ratio denominators.
Default consistency — Defaulted exposures must match regulatory default definition used in models.
Leverage reconciliation — Exposure in leverage ratio must reconcile to balance sheet plus model-generated EAD for off-balance sheet items.
No negative or missing risk parameters.
Cross-template equality — e.g., exposure class breakdowns must match across modules.
Output floor adjustments must be explainable and traceable.
COREP Summary (Memorise This)
COREP is the key prudential reporting framework used by supervisors to assess capital adequacy. Under CRR3, its importance increases due to the output floor, revised risk approaches, and higher expectations around transparency. ECB and auditors focus strongly on unexplained RWA movements, output floor transparency, consistency with FINREP and Pillar 3, and robust governance and documentation. My role is to ensure COREP numbers are not only correct, but defensible and clearly explained.
COREP Template Structure
Capital adequacy ration:
(T1+Tier 2)Total Capital/ RWA x 100
Key Components:
Tier 1 Capital (Core Capital): Includes shareholders’ equity, retained earnings, and disclosed reserves.
Tier 2 Capital (Supplementary Capital): Includes undisclosed reserves, hybrid securities, and subordinated debt.
Risk-Weighted Assets (RWA): The bank’s total assets multiplied by their respective risk levels (e.g., loans have higher risk weights than government bonds).
| CR SA | Credit RWA under Standardized Approach
| CR Floor | Output floor impact and RWA adjustments |
| LR | Leverage exposure & leverage ratio |
| LCR / NSFR | Liquidity buffers, inflows/outflows, stable funding |
| LE | Large exposures |
| Module | Covers |
| CR IRB | PD, LGD, EAD, defaulted exposures, RWA from internal models |
| CA | Capital adequacy (CET1/
Module | Covers |
COREP Templates: Specific Changes & Examples
Templates that change or are introduced:
✓ Output Floor templates
RWA breakdown with standardized methods
Comparative fields for output floor application
✓ Credit risk templates
Expanded fields for:
Exposure types (e.g., corporates, retail, SMEs)
Collateral and guarantees
LTV bands for real estate
✓ Market risk templates
Updated fields aligned with FRTB SA and internal models
✓ Operational risk templates
BI/loss component fields
Clear traceability to capital calculations
✓ Capital adequacy templates (CET1 / Tier 1 / Total)
Must reflect:
Transitional rules
Output floor results
Any impacts from model limitations
Pro interview insight:
Interviewers are not just interested in which templates change, but why — so focus on regulatory drivers behind each template update.
COREP templates most affected (say this confidently)
Capital Adequacy templates (CET1 / Tier 1 / Total)
Credit Risk templates (SA & IRB)
Market Risk templates (FRTB)
Operational Risk template (SMA)
Output Floor-related disclosures
Interview tip: Stress that template changes are driven by regulation, not reporting preference.
COREP ↔ FINREP ↔ Pillar 3 Consistency
Why it matters:
Regulatory (COREP), accounting (FINREP), and market transparency (Pillar 3) reporting must tell a consistent story.
Inconsistencies raise audit flags and trigger supervisory questions.
Focus areas for consistency:
Capital components: CET1, AT1, Tier 2 must match across reports
RWA totals and risk breakdowns need to logically reconcile
Output floor effects must be consistent across COREP and Pillar 3
Narrative explanations should align in all reports
Example phrasing:
I always ensure consistency by establishing solid reconciliation controls between COREP, FINREP, and Pillar 3. Any differences must be documented, justified, and signed off before submission — as supervisors will look for consistent storylines, not isolated silos of data.
CRR3 & COREP foundations, focused on:
Capital requirements
RWA for credit risk calculation logic (with criteria + key drivers)
LCR and Leverage ratio requirements/criteria
CRR3 summary (credit RWA, default definition, model governance)
COREP structure + validation rules
Short note: CRR3 → model implementation implications
CRR3 Output Floor – impact on capital ratios
What changes under CRR3?
RWAs calculated using internal models cannot fall below 72.5% of RWAs calculated under standardized approaches.
RWAfinal=max(Model RWA,72.5%×Standardised RWA)
Why this matters:
RWAs may increase → capital ratios decrease
No change in capital numerator, only denominator
👉 ECB hot-button phrasing:
Under CRR3, capital ratios may decline even if the risk profile is unchanged, purely due to the output floor.
CRR3 → Model Implementation Implications
“CRR3 doesn’t remove credit risk models, but it changes how they plug into capital systems.”
Banks must build parallel RWA engines: Standardized + IRB + Floor reconciliation.
Model pipelines need regulatory floors and overrides embedded in logic.
Default labels must be recalibrated to stricter EBA-aligned rules.
Strong model governance must be productionized — model registry, approvals, documentation, validation, monitoring, and audit logs.
Floor impacts create a capital adjustment layer that must be reproducible for COREP reporting.
Leverage ratio data feeds must consume model EAD/CCF consistently.
CRR3: Key impacts on COREP
a) Output Floor
Requires internal model RWAs ≥ 72.5% of standardized RWAs
Affects COREP capital ratios at consolidated level
COREP implications
New fields for standardized RWA comparison
Core capital tables must show pre-floor vs post-floor positions
Additional disclosures may be needed for binding/not binding status
This is the most material change for regulatory capital monitoring.
b) Credit Risk
Revised Standardised Approach (more granular risk weights)
Limitations on Internal Ratings-Based (IRB) models
PD/LGD floors
COREP implications
Expanded credit risk templates and breakdowns
Adjustments to exposure class calculations
Consistent documentation of IRB vs SA RWA outcomes
c) Market Risk
FRTB implementation requirements
New sensitivity-based standardized approach (SA01 templates)
COREP implications
New/revised market risk templates
Higher data granularity
Reconciliation controls between old and new market RWA calculations
d) Operational Risk
Transition to SMA (Standardised Measurement Approach)
COREP implications
New operational risk template
Inclusion of BI and loss components
Consistent reporting across legal entity and consolidated levels
Can you explain Basel III and its importance for regulatory reporting?
Basel III is a global regulatory framework implemented through CRR and CRD in the EU to strengthen bank capital adequacy, liquidity, and leverage requirements.
Its main objectives are to:
Improve banks’ ability to absorb losses
Strengthen capital quality through CET1 requirements
Introduce leverage and liquidity ratios
Enhance risk coverage and transparency
From a regulatory reporting perspective at Citi, Basel III requirements are reflected in COREP reports, where we calculate and report:
CET1, Tier 1, and Total Capital ratios
Risk-Weighted Assets (RWA)
Leverage Ratio
Capital buffers and requirements
These reports are submitted to Bundesbank and BaFin and reviewed by ECB under the Single Supervisory Mechanism.
Capital Adequacy Templates (MOST IMPORTANT)
What they show
CET1, Tier 1, Total Capital ratios
RWAs by risk type
CRR3 impact
Output floor affects total RWAs
Capital ratios may change without business activity
ECB focus
Are ratios correct?
Are movements explainable?
Capital Requirements — Criteria & Thresholds
Banks must meet minimum ratios calculated as:
CET1 ratio = CET1 Capital ÷ Total RWA
Tier 1 ratio = Tier 1 Capital ÷ Total RWA
Total Capital ratio = (Tier 1 + Tier 2) ÷ Total RWA
Key criteria
CET1 must be mostly equity and retained earnings
Supervisory deductions are stricter (e.g., intangible assets, deferred tax assets, insufficient provisions)
RWA must include credit, market, CVA, and operational risk
Capital buffers (on top of minimums)
Banks must hold capital above Pillar 1 minima:
Capital Conservation Buffer (CCB): 2.5% CET1
Countercyclical Buffer (CCyB): country-specific
Systemic buffers (O-SII / G-SII)
Pillar 2 Guidance (supervisory)
👉 Interview phrasing:
Breaching buffers does not mean insolvency, but it triggers restrictions on distributions.
Capital ratio calculation formulas (must memorise)
CET1 Ratio
CET1ratio=CET1 Capital/Risk-Weighted Assets (RWA)
CET1 Capital includes:
Common shares
Share premium
Retained earnings
Other comprehensive income
minus regulatory deductions (intangibles, DTAs, etc.)
Capital ratios under CRR3
CET1 ratio Highest-quality capital vs RWAs
Loss-absorbing capacity
Tier 1 ratio CET1 + AT1 vs RWAs
Going-concern capital
Total Capital ratio Tier 1 + Tier 2 vs RWAs
Overall solvency
Common COREP Validation Rules
Supervisors run automated validation checks such as:
RWA consistency → RWA totals must match capital ratio denominators
Default alignment → Defaulted exposures must match EBA default definition used in models
Leverage reconciliation → Total exposure used in LR must reconcile to balance sheet + off-BS EAD
No negative or missing risk parameters
Cross-template equality checks (e.g., exposure class breakdowns must match across modules)
Standardized vs IRB comparison must exist and floor adjustments must be explainable.
Credit Risk Templates (SA & IRB)
What they show
RWAs by exposure class (corporates, retail, mortgages, etc.)
Standardised vs internal models
CRR3 impact
Revised standardised approach
IRB restrictions and parameter floors
ECB focus
Clear split between IRB and SA
Consistent exposure values
Default Definition (CRR3/EBA aligned) — Criteria
A borrower is defaulted when:
90+ Days Past Due (DPD) on a material credit obligation, OR
Unlikely To Pay (UTP) criteria are met, such as:
Distressed restructuring
Bankruptcy/insolvency
Fraud
Severe financial deterioration
Contagion rules across products
Probation and cure periods must be applied
Materiality thresholds determine if 90+ DPD triggers default
Impact on models → Default labels become more conservative, earlier, and standardized, which directly changes model training datasets and recalibration needs.
Difference between Expected Loss and RWA?
Expected Loss is an accounting concept covered by provisions.
RWA is a regulatory concept used to calculate capital requirements.
Expected Loss uses PD, LGD, and EAD directly.
RWA uses regulatory formulas to determine capital required for unexpected loss.
Explain Basel III capital framework.
asel III is a regulatory framework designed to strengthen bank capital, liquidity, and risk management.
It includes:
Capital Adequacy Ratio (CET1, Tier 1, Total Capital)
Leverage Ratio
Liquidity ratios (LCR, NSFR)
Credit risk measurement (Standardized and IRB approaches)
Output Floor to limit model risk
Its main goal is to improve the resilience of banks during financial stress.