Question 1

What is FRTB IMA?

Accepted Answer

FRTB IMA (Internal Models Approach) is the advanced alternative to the standardized approach within the FRTB framework of the Basel Committee on Banking Supervision (BCBS d457). It allows an entity to calculate its regulatory capital for market risk using its internal models, subject to supervisory approval per desk. The central measure is Expected Shortfall (ES) at 97.5% calibrated to a historical stress period, instead of the VaR of the previous framework.

Question 2

Which tests must a desk pass for IMA approval?

Accepted Answer

Each desk must pass two quarterly tests: (1) Backtesting comparing standard VaR (99% and 97.5%) against hypothetical P&L and actual P&L; exceptions that exceed thresholds lead to downgrading the desk. (2) P&L Attribution Test (PLAT) comparing the hypothetical P&L of the front-office model against the hypothetical P&L of the risk model, with Spearman and Kolmogorov-Smirnov metrics within bands. A desk that fails the tests is relegated to the standardized approach, with significantly higher capital consumption.

Question 3

What HPC infrastructure does FRTB IMA require?

Accepted Answer

The daily per-desk calculation involves revaluing the portfolio under hundreds of risk scenarios (Liquidity Horizons by risk factor, non-modellable risk factor NMRF scenarios, stressed scenarios) and producing Expected Shortfall, Stressed ES, NMRF stress capital, default risk charge, and the inputs for PLAT and backtesting. For a tier 1 bank with dozens of trading desks, the resulting grid handles billions of revaluations per day. Typical infrastructure: HPC cluster of tens of thousands of cores with Symphony orchestrator or equivalent, capable of completing the regulatory cycle within the intraday window.

Question 4

How does it fit into a 2026 tier 1 European bank architecture?

Accepted Answer

In typical 2026 tier 1 banking architecture, FRTB IMA calculation runs on IBM Spectrum Symphony clusters with proprietary engines (Murex, Algorithmics, Openlink) or internal C++/Python. The stack aligns with DORA Art. 28 (documented critical ICT providers) and, if it embeds AI models, with ISO 42001 and the AI Act. Vermont Solutions operates these environments with +130 K HPC cores managed, 300 M tasks/day and -75% risk simulation time thanks to the Symphony Add-on.

Question 5

Is FRTB IMA in force in 2026?

Accepted Answer

The effective application of FRTB in the EU has suffered successive delays from the original BCBS calendar. EU Regulation 2024/1623 (CRR3) postponed FRTB entry into force in the EU to 1 January 2026 for the standardized approach, with empowerment for the European Commission to delay IMA through delegated act. The exact status of IMA by jurisdiction must be verified with the competent authority — most tier 1 European banks maintain IMA development in parallel pending the definitive applicability.

FRTB IMA — Internal Models Approach for market risk

Calculation components

Typical computational load

European tier 1 reference stack

Official sources