IFRS quantitative finance series
IFRS 9 Staging and SICR: Quantitative Tests That Banks Can Defend
Significant increase in credit risk determines whether a bank recognises twelve-month or lifetime expected losses. It is a relative assessment since initial recognition, supported by reasonable and supportable information and not reduced to a mechanical arrears rule.
Relative and absolute risk
A relative increase in lifetime default risk is often the main quantitative signal, but very low-risk assets can display large ratios from a small base while high-risk assets may deteriorate materially without a dramatic ratio. Combining relative and absolute thresholds can make the decision more stable.
Qualitative information matters
Watchlists, forbearance, covenant breaches, sector stress and adverse borrower information can identify deterioration before delinquency. These indicators need clear ownership, effective dates and evidence that they enter staging promptly rather than after the reporting close.
Validate transitions, not just balances
Validation should examine migration into and out of Stage 2, time spent in stage, subsequent default, cures and re-defaults. A low Stage 2 balance is not evidence of quality if the rule transfers accounts only immediately before default.
Quantitative expression
Implementation controls
- Store origination risk measures for every account.
- Test backstops and rebuttals separately.
- Monitor Stage 2 entry lead time before default.
- Require documented approval for cures and overrides.