What is ECL and Why It Matters
Under IAS 39 (the old standard), you recognized losses only when evidence of impairment existed — typically when a payment was late or default occurred. This is the "incurred loss" model.
IFRS 9 flipped the model to forward-looking: you estimate the probability of default and recognize an allowance even for performing assets. This reflects economic reality: a loan made today has some probability of defaulting in the future, so that risk should be recognized now.
The Three-Stage ECL Model
IFRS 9 uses three stages to determine how much ECL to recognize:
| Stage | Asset Status | ECL Type | Trigger |
|---|---|---|---|
| Stage 1 | Performing (Low credit risk) | 12-month ECL | No SICR since recognition |
| Stage 2 | Underperforming (Increased risk) | Lifetime ECL | SICR occurred, but not in default |
| Stage 3 | Credit-impaired (In default) | Lifetime ECL | Default criteria met (>90 days arrears, bankruptcy, etc.) |
Stage 1: Performing Assets (12-Month ECL)
Most financial assets start in Stage 1 when initially recognized. The ECL allowance covers only the probability of default within the next 12 months.
ECL Calculation for Stage 1
Example: Bank mortgage, Stage 1
- Mortgage balance: £300,000
- PD (12-month): 0.15% (0.0015) based on historical mortgage default rates
- LGD: 25% (0.25) — property can be sold for ~75% of loan value
- EAD: £300,000
ECL = 0.15% × 25% × £300,000 = £1,125
The bank records a loss allowance of £1,125 against this mortgage, even though the borrower is current and paying on time.
Stage 2: Underperforming Assets (Lifetime ECL at SICR)
When credit risk increases significantly, the asset moves to Stage 2. Now you recognize the full lifetime ECL — the probability of default any time in the remaining life of the asset.
ECL Calculation for Stage 2
Same mortgage, now in Stage 2 (SICR triggered)
- Mortgage balance: £290,000 (£10k principal repaid)
- PD (lifetime, 27 years remaining): 2.5% (0.025) — borrower's credit rating dropped; unemployment risk increased
- LGD: 30% (0.30) — collateral slightly impaired
- EAD: £290,000
ECL = 2.5% × 30% × £290,000 = £21,750
The loss allowance jumped from £1,125 to £21,750. The increase (£20,625) is recognized as an impairment loss in P&L.
SICR Indicator: What Triggered the Move?
Possible triggers for this mortgage:
- Borrower's credit score dropped 100+ points
- Payment was 30 days late (but not yet 90)
- Borrower's employer issued a redundancy notice
- Local unemployment spiked to 8%+
Stage 3: Credit-Impaired Assets (Default & Lifetime ECL)
When an asset meets the default criteria (typically >90 days past due, bankruptcy filing, or unlikely to pay), it moves to Stage 3. The ECL remains lifetime, but recovery expectations are more pessimistic.
ECL Calculation for Stage 3
Same mortgage, now in Stage 3 (Default)
- Mortgage balance: £280,000
- PD: 100% (assumed defaulted; we're calculating loss, not probability)
- LGD: 45% (0.45) — property market weakened; recovery expected at 55% of outstanding)
- EAD: £280,000
ECL = 100% × 45% × £280,000 = £126,000
The full loss allowance is £126,000. Interest income on this mortgage is now calculated on the net amount (£280,000 −’ £126,000 = £154,000), not the gross balance.
SICR Triggers and Thresholds
SICR is the judgment call that determines when to move assets from Stage 1 to Stage 2. It's also where auditors spend the most time.
Quantitative SICR Triggers
| Portfolio Type | SICR Threshold | Example |
|---|---|---|
| Retail mortgages | 30 days arrears OR PD →‘ 200 bps | Payment 30+ days late; or PD from 0.5% to 2.5% |
| Credit cards | 60 days arrears OR PD →‘ 150 bps | Account delinquent; or risk premium increased |
| Corporate loans | Covenant breach OR credit rating downgrade ≥2 notches OR PD →‘ 300 bps | Debt/EBITDA covenant breached; or S&P downgraded to speculative |
Qualitative SICR Triggers
- Management change: CFO departed unexpectedly; board shake-up
- Regulatory action: License revoked; legal sanction
- Restructuring: Bankruptcy filing; debt-for-equity swap offered
- Industry decline: Oil price crash; retail sector downturn affecting borrower
- Collateral decline: Property value dropped 25%+; inventory obsolete
Audit Challenge: Many banks set SICR thresholds too conservatively (e.g., 500 bps PD increase). Auditors push back: "Market guidance is 300 bps. Your higher threshold delays Stage 2 movement and understates ECL." Result: ECL increases by 5— 10%+ in final audit adjustments.
PD, LGD, EAD: The Three Components
PD (Probability of Default)
Definition: The % probability that a borrower will default within a specified time frame (12 months for Stage 1, lifetime for Stage 2/3).
Estimation methods:
- Historical default rates: "In the past 20 years, 0.5% of mortgages defaulted"
- Credit rating PD: S&P/Moody's publish PDs by rating (e.g., BBB = 0.3% 1-year PD)
- Market-implied PD: From CDS spreads or bond yields
- Borrower-specific: Internal risk models based on FICO scores, income, debt ratios
LGD (Loss Given Default)
Definition: The % of exposure that is lost if the borrower defaults.
Components: LGD = (EAD −’ Recovery) / EAD
Estimation methods:
- Collateral value: If the loan is secured, LGD = 1 −’ (collateral value / loan value)
- Historical recovery rates: "We recovered 65% of mortgages in default"
- Seniority: Secured loans have lower LGD; unsecured have higher
- Industry benchmarks: Retail loans typically 40— 50% LGD; unsecured consumer 60— 80%
EAD (Exposure at Default)
Definition: The total amount outstanding at the time of default.
For a term loan: Simply the principal outstanding
For a credit facility: Drawn amount + estimated future drawings
- Example: £500k line of credit, £300k drawn, £200k undrawn. If default happens, bank may draw the remaining £200k before the default materializes. EAD = £500k, not £300k.
Worked Example: Mortgage Portfolio ECL
Bank's Retail Mortgage Portfolio (31 Dec 2025)
- Total mortgages: £2 billion
- Stage 1 (performing): £1.8bn
- Stage 2 (SICR): £160m
- Stage 3 (defaulted): £40m
Stage 1 Calculation
Parameters: PD 12m = 0.18%, LGD = 25%, EAD = £1.8bn
ECL = 0.18% × 25% × £1.8bn = £810,000
Stage 2 Calculation
Parameters: PD lifetime = 2.2%, LGD = 28%, EAD = £160m
ECL = 2.2% × 28% × £160m = £9,856,000
Stage 3 Calculation
Parameters: PD = 100%, LGD = 42%, EAD = £40m
ECL = 100% × 42% × £40m = £16,800,000
Total ECL Allowance
Journal Entry (31 December 2025):
Cr Loss Allowance on Mortgages 27,466,000
Worked Example: Corporate Loan Portfolio Movement
Scenario: Technology Company Loan (1-Year Period)
1 January 2025: Initial recognition (Stage 1)
- Loan balance: £10m
- PD (12m): 0.8%
- LGD: 35%
- ECL = 0.8% × 35% × £10m = £28,000
30 June 2025: SICR occurs (moves to Stage 2)
- Borrower's credit rating downgraded from BB+ to BB−’ (2-notch decline)
- Loan balance: £9.5m (£500k repaid)
- PD (lifetime, 4.5 years): 4.5%
- LGD: 38%
- ECL = 4.5% × 38% × £9.5m = £1,620,750
Journal Entry (30 June 2025):
Cr Loss Allowance on Loan 1,592,750
(The increase from £28k to £1,620,750 is £1,592,750 of incremental impairment loss.)
Post-Model Adjustments (PMAs)
Many banks don't rely solely on the mechanical ECL formula. They apply "post-model adjustments" for factors the model doesn't capture:
- Macroeconomic scenarios: "Our model assumes baseline growth; recession is 30% likely, which would increase PD by 150 bps"
- Portfolio concentrations: "Retail portfolio is 40% real estate; commercial real estate downside is significant"
- Recent events: "Tech IPO market collapsed; our venture debt losses rose; lifetime PD increases 200 bps"
Audit Challenge: PMAs are subjective. Auditors scrutinize: "How did you justify a £5m PMA? Is it documented? Is it reversible or permanent? How does it correlate to your forward-looking info?"
Audit Red Flags in ECL
Red Flag 1: Stage 2 Thresholds Too High
Finding: Bank's SICR threshold is 500 bps PD increase; market standard is 300 bps.
Auditor action: Recalculate ECL using 300 bps threshold; estimate the impact (+£8m); propose adjustment.
Red Flag 2: Lack of Documentation
Finding: No written policy on how SICR is identified; asset reclassifications appear arbitrary.
Auditor action: Require documented SICR policy, then retroactively reclassify assets under that policy.
Red Flag 3: PMAs Unexplained
Finding: Management applied a £10m PMA for "general economic uncertainty" but provided no detailed justification.
Auditor action: Challenge the PMA; often it's reduced or eliminated.
Red Flag 4: Interest Income Misstatement in Stage 3
Finding: Bank continues to recognize interest on Stage 3 loans using the gross carrying amount, not the net amount (gross −’ allowance).
Auditor action: Correct interest income; likely a £2— 5m adjustment for large Stage 3 portfolios.
Real-Life Case Study: Staging a Loan Under the ECL Model
Scenario. A lender advances £1m to a corporate borrower. Over 18 months the borrower's credit deteriorates.
- Origination (Stage 1): 12-month ECL, say £5k provision.
- Significant increase in credit risk (Stage 2): after two covenant breaches, lifetime ECL, provision jumps to £60k, even though no payment is missed.
- Credit-impaired (Stage 3): borrower misses payments, interest now recognised on the net (post-provision) carrying amount.
Takeaway. The big P&L hit comes at the Stage 1→2 move, driven by change in risk since origination, not by an actual default. Auditors focus hard on the SICR triggers because that is where judgement, and provision size, is greatest.
Illustrative composite scenario for educational purposes. Figures are indicative and do not represent any specific company.
→ IFRS 9 Financial Instruments Hub
• IFRS 9 Classification & Measurement: Business Model Test & SPPI Explained
• IFRS 9 Hedge Accounting: Cash Flow & Fair Value Hedges with Effectiveness Testing
• IFRS 9 Impairment Accounting: Lifetime ECL vs 12-Month ECL & Stage Movements
• IFRS 9 Modification & Derecognition: Loan Changes, Forgiveness & Exit Accounting