BoT prudential review 2026: where IFRS 9 stage transitions broke.
The Bank of Tanzania’s 2026 thematic prudential review found seven recurring IFRS 9 issues across commercial banks. Stage-2 migration thresholds, lifetime ECL inputs, and the gap between the IFRS 9 model output and the prudential return were the three biggest.
The Bank of Tanzania closed out its 2026 thematic prudential review on commercial-bank IFRS 9 implementations in late 2025. Seven issues recur across files we’ve seen, ranging from technical model questions to governance escalation pathways.
Stage-2 migration thresholds
The most common finding: stage-2 thresholds set at transition that have not been revisited despite portfolio shifts. Several banks were still applying 30-day arrears proxies on portfolios where the underlying default behaviour now diverges from that proxy.
"The model that was conservative at transition is not necessarily conservative three reporting cycles in."
Lifetime ECL inputs
Lifetime ECL inputs, particularly forward-looking macroeconomic scenarios, were either uncalibrated since 2023 or copied from group templates that don’t reflect Tanzanian-specific drivers (e.g. tourism cycles, agricultural commodity prices, Tanzania-shilling FX). The BoT review flagged both as material.
The IFRS 9 vs prudential return reconciliation
Most banks could explain the IFRS 9 number and could explain the prudential number. The issue was the explicit reconciliation between the two, requested by the BoT review team in 2026, which several banks could not produce within the 30-day window.
- Stage-2 trigger thresholds not refreshed for portfolio drift.
- Forward-looking macro scenarios stale or imported without local calibration.
- Lifetime ECL probability-of-default curves still on transition basis.
- Significant-increase-in-credit-risk (SICR) tests not documented per portfolio.
- IFRS 9 vs prudential return reconciliation not maintained.
- Override committee minutes lacking risk officer challenge documentation.
- Audit-committee escalation pathway for ECL judgements unclear.
What audit committees should ask
If the bank you serve was reviewed in 2026, ask: which of the seven were flagged, what is the remediation plan, and what is the timetable for the next thematic review. If your bank has not been reviewed yet, run the same diagnostic against the seven internally before the BoT does it for you.