| 1. Scope and timetable | The regimes and the dates: Basel 3.1 from 1 January 2027, the market risk internal model approach from 1 January 2028, the SDDT regime for firms that opt in. | PS1/26; PS4/26 |
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| 2. Credit risk, standardised approach | Loan-splitting for residential mortgages (20% up to 55% of value), whole-loan weights where repayment depends on the property, assessing every existing exposure for that dependence by 1 January 2027, and the new weights for unrated corporates and SMEs. | CRR Instrument 2026, Articles 122 and 124F to 124G; PS1/26 para 2.6 |
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| 3. IRB | Which portfolios leave IRB, including central governments, central banks, equity and advanced IRB for corporates with revenue above £440 million; the PD, LGD and EAD input floors; slotting or the standardised approach for income-producing real estate. | PS9/24 chapter 3; PS1/26 para 2.10 |
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| 4. Operational risk | The Business Indicator built from the financial statements, the 12%, 15% and 18% marginal coefficients, and an internal loss multiplier fixed at one. | Operational Risk Part 5.8 and 5.9 |
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| 5. Market risk and CVA | The trading book boundary, the advanced and simplified standardised approaches, and the alternative, basic and standardised approaches to CVA risk. | PS1/26 chapter 3; PS17/23 chapter 4 |
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| 6. Output floor | Total risk exposure amount as the higher of un-floored RWAs and the floor share of standardised RWAs with the provisions adjustment, from 60% in 2027 to 72.5% from 1 January 2030, and where in the group it applies. | CRR Instrument 2026, Article 92 |
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| 7. Pillar 2A, the ICAAP and reporting | The off-cycle review, the end of the refined methodology, the Phase 1 Pillar 2A review and the lending adjustments; then the ICAAP, the new returns and the Pillar 3 templates. | PS9/24 chapter 6; PS2/26; PS15/26; PS1/26 |
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