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Calculate 12-Month vs Lifetime ECL — IFRS 9 Worked Example | CALC SERIES #11

When a loan moves from Stage 1 to Stage 2 under IFRS 9, the ECL jumps from a 12-month measure to a lifetime measure. Here's the full PD × LGD × EAD calculation for both stages, the journal entry for the additional provision, and the interest treatment that trips most people.

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Calculate 12-Month vs Lifetime ECL — IFRS 9 Worked Example | CALC SERIES #11

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In this video

0:00 Introduction — IFRS 9's three-stage ECL model
0:22 The scenario — €500k loan, PD 2% (Stage 1), PD 15% (Stage 2), LGD 40%
0:55 Stage 1: 12-month ECL = 2% × 40% × €500k = €4,000
1:25 Significant increase in credit risk — trigger for Stage 2 move
1:55 Stage 2: lifetime ECL = 15% × 40% × €500k = €30,000
2:25 Additional provision required: €30,000 − €4,000 = €26,000
2:50 Journal entry for Stage 2 provision — Dr Credit loss expense / Cr Loss allowance
3:15 Stage 2 interest: still on gross carrying amount, not net
3:45 Common mistake — using 12-month PD for lifetime ECL
4:10 Recap — stage framework and the provision calculation

Key terms in plain English

Expected credit loss (ECL): A probability-weighted estimate of credit losses over the expected life of a financial instrument. IFRS 9 requires ECL to be recognised from the date of initial recognition, even before any loss event occurs.
12-month ECL: The portion of lifetime ECLs that represents expected credit losses from default events possible within 12 months after the reporting date. Applies to Stage 1 instruments where credit risk has not significantly increased.
Lifetime ECL: Expected credit losses resulting from all possible default events over the expected life of a financial instrument. Applies to Stage 2 (significant credit risk increase) and Stage 3 (credit-impaired) instruments.
Significant increase in credit risk: The threshold for moving from Stage 1 to Stage 2 under IFRS 9. There is no bright-line rule; entities assess relative, not absolute, changes in the risk of default since initial recognition.
Loss given default (LGD): The proportion of the exposure at default that will not be recovered in the event of default. LGD = 1 minus the recovery rate.

Full explanation

IFRS 9's three-stage ECL framework

IFRS 9 introduced a forward-looking expected credit loss model to replace IAS 39's incurred-loss approach. The model uses three stages to determine how much ECL to recognise. Stage 1: credit risk has not significantly increased since initial recognition — recognise 12-month ECL. Stage 2: credit risk has significantly increased but the instrument is not yet credit-impaired — recognise lifetime ECL. Stage 3: the instrument is credit-impaired — recognise lifetime ECL and calculate interest on the net carrying amount.

The scenario: €500,000 loan, Stage 1 then Stage 2

Parameters: exposure at default (EAD) = €500,000. Loss given default (LGD) = 40%. Stage 1: probability of default over 12 months = 2%. Stage 2: lifetime probability of default = 15%. The loan was initially in Stage 1. During the period, a significant increase in credit risk is identified — the loan moves to Stage 2.

Stage 1 ECL calculation

12-month ECL = PD × LGD × EAD = 2% × 40% × €500,000 = €4,000. This was already recognised as the opening loss allowance. Journal entry at initial recognition: Dr Credit loss expense €4,000 / Cr Loss allowance €4,000.

Stage 2 ECL calculation

Lifetime ECL = 15% × 40% × €500,000 = €30,000. The loss allowance must increase from €4,000 to €30,000. Additional provision required: €26,000. Journal entry: Dr Credit loss expense €26,000 / Cr Loss allowance €26,000.

Interest treatment in Stage 2

In Stage 2, the loan is not yet credit-impaired. IFRS 9 paragraph 5.4.1 requires interest revenue to be calculated on the gross carrying amount — before deducting the loss allowance. This is often confused with Stage 3, where interest is calculated on the net carrying amount (gross carrying amount minus the loss allowance). Moving to Stage 2 increases the ECL provision and expenses it, but does not change the interest calculation basis.

Common mistake: using 12-month PD for lifetime ECL

A common exam error: using the 12-month PD of 2% for the Stage 2 calculation. That gives 2% × 40% × €500,000 = €4,000 — identical to Stage 1. The lifetime ECL uses the lifetime PD of 15% because Stage 2 requires consideration of all possible default events over the expected life of the instrument, not just those within 12 months. The entire point of the stage move is that the institution now expects a higher loss over the life of the loan, and that higher expectation must be reflected in the allowance.