PRA LIAF02/26: The Low-Impact Corrections That Bite on 1 January 2027

On 29 July 2026 the Prudential Regulation Authority published PRA LIAF02/26, finalising its April 2026 Low Impact Amendments Consultation (LIAC01/26) plus minor corrections made without further consultation. The “low impact” label is supervisory housekeeping and easy to leave unread. The trap is that several of these corrections touch the exact PRA Rulebook Parts that UK banks and building societies are already rebuilding for Basel 3.1 and for the restatement of the Capital Requirements Regulation into the Rulebook. The Basel 3.1 policy and rules generally apply from 1 January 2027, except for the market-risk internal model approach, which applies from 1 January 2028; the remainder-CRR restatement applies from 1 January 2027.

The changes do not arrive together. Statements of policy changed on 29 July 2026, one Groups Part rule change took effect on 30 July 2026, most rule amendments apply on 1 January 2027, and one operational-incident reporting correction is deferred to 18 March 2027. The task is to map which pieces reach your build and on which date.

Related reading: our guide to the PRA’s Basel 3.1 market risk and IMA adjustments.

The LIAF02/26 dates that actually matter

LIAF02/26 is deadline-driven only because it plugs into the 1 January 2027 implementation date for the UK’s post-Brexit prudential framework. LIAC01/26 consulted on six proposals; the PRA received a single response, on proposals 1 and 3, and finalised the rest broadly as consulted. Map each correction to its own commencement rather than assuming a single go-live:

• 29 July 2026: the statement of policy amendments under proposals 4, 5 and 6, covering the frequency of the O-SII designation exercise in SoP1/16, the scope of the O-SII buffer in SoP1/16 and SoP4/16, and Solvency II technical information in SoP1/20.
• 30 July 2026: the Groups Part rule amendments in Annex A of the finalised instrument.
• 1 January 2027: the consequential amendments to PRA rules relating to the Capital Requirements Regulations 2013, the Groups Part amendments in Annex B, the countercyclical capital buffer technical standard changes, the corrected “netting set” Glossary definition, the Credit Risk Standardised Approach and Internal Ratings Based corrections, and the SS15/13 changes.
• 18 March 2027: the corrections to the Notifications Part and the Regulatory Reporting Part on operational incident and third-party notifications.

Proportional consolidation now turns on voting rights

The Groups Part change is the one most likely to reach a consolidation model. The PRA clarified that a firm must apply proportional consolidation when a participation arises from its voting rights, where the rule previously referred only to a firm’s share of capital. It did this by amending Article 18(5) of the Groups Part, as finalised in PS3/26 on the restatement of CRR requirements, to add the voting-rights reference from 1 January 2027.

The respondent asked which proportion to consolidate when voting rights and capital differ. An updated SS15/13 answers: where a firm holds only voting rights, it consolidates on its share of voting rights; where it holds voting rights and capital in different proportions, it consolidates on its share of capital; and it may instead use its share of voting rights where that share is higher and better reflects the economic substance. The correction does not move the threshold for whether a participation exists. A participation still arises where a firm holds 20% or more of the voting rights or the capital of an undertaking; what changes is how much of the undertaking to consolidate.

The countercyclical buffer technical standard changes its plumbing

Proposal 3 amends the UK Technical Standard that identifies the geographical location of relevant credit exposures for calculating institution-specific countercyclical capital buffer rates. The buffer calculation is unchanged; the amendments replace cross-references to Capital Requirements Regulation provisions with references to the PRA Rulebook, reflecting Basel 3.1 in PS1/26 and the CRR restatement in PS3/26. For how these buffers sit in the stack, see our explainer on macroprudential buffer stacking. The definition of “trading book exposures” was aligned with the Capital Buffers Part, and the PRA confirmed that the Market Risk: Internal Models Approach (CRR) Part references to incremental default and migration risk apply during the current IMA transitional period. When that period expires at the end of 2027, ahead of FRTB-IMA applying from 1 January 2028, those references cease and the new default risk references become effective.

Credit-risk corrections riding in with Basel 3.1

Because PS1/26 introduces the UK’s Basel 3.1 credit-risk rules from 1 January 2027, the PRA used LIAF02/26 to correct four points in that not-yet-in-force material, which makes the Basel 3.1 build the cleanest place to absorb them. Article 120(4) of the Credit Risk: Standardised Approach (CRR) Part is clarified so that, where multiple credit ratings are available, due diligence is carried out only for the single credit rating selected under Articles 138 and 139 for a given exposure. Readers building the EU equivalent can compare our guide to CRR3 credit-risk standardised approach ECAI due diligence, noting that the UK now cites its own Rulebook Parts.

Articles 121(2) and 121(5) are corrected for exposures to Article 119 institutions with no nominated ECAI rating: the Article 121(2) risk weight for exposures over three months’ original maturity does not apply where the Article 121(4) treatment for goods-movement exposures of six months or less applies, and the Article 121(5) preferential 30% risk weight can be used as an alternative to Article 121(2) but not to Article 121(4). Article 151(5) of the Credit Risk: Internal Ratings Based Approach (CRR) Part is corrected for the exposure value of slotting-approach exposures giving rise to counterparty credit risk, and inaccurate references to the “residential real estate” definition in paragraphs 5.8 and 5.9 of SS10/13 are fixed. The PRA made these without further consultation as within CP16/22 on the Basel 3.1 standards.

The operational-incident reporting fix lands last

The latest-commencing correction follows PS7/26 on operational incident and third-party reporting, published in March 2026. Rule 2.3B(1) of the Notifications Part is corrected so that third country branches are excluded from the material third-party notification requirements, and Rule 25.1(5) of the Regulatory Reporting Part is corrected so that UK branches of overseas banks are included in the operational incident reporting requirements. The PRA treats both as within CP17/24 and made them without further consultation, effective 18 March 2027.

Branch structures are where this bites, because each correction moves a different perimeter in a different direction, one out of a notification duty and one into a reporting duty. When I read a correction like this, I trace each named rule to the return it feeds, since a wording fix in a notification Part can change which legal entity files. Firms running the UK counterpart to the EU machinery in our DORA ICT incident reporting guide should confirm which branch entities the corrected rules capture before the March 2027 date.

The glossary fix that is easy to miss

The “netting set” correction is the kind that breaks a downstream calculation silently. PS3/26 restated the CRR definition of “netting set” into the Glossary Part from 1 January 2027, and LIAF02/26 corrects an error in a cross-reference inside it so that it points at Section 7 of Chapter 3 of the Counterparty Credit Risk (CRR) Part and the Credit Risk Mitigation (CRR) Part, with a minor editorial correction. The PRA relied on CP13/24 on the remainder of the CRR restatement and states that the change does not alter policy.

Frequently Asked Questions

Does LIAF02/26 change any COREP or regulatory return templates?

No. It amends PRA Rulebook Parts, a UK Technical Standard, and several supervisory statements and statements of policy. The operational-incident corrections change which branch entities fall inside the notification and reporting perimeters, but the data items themselves are unchanged.

Can firms use the new SS15/13 consolidation guidance before 2027?

The SS15/13 changes are implemented from 1 January 2027, but the PRA states that firms may refer to them for guidance in the meantime. That matters if you are validating a consolidation model now, because the expectations on how much of a participation to consolidate are already visible.

Which firms need to look at the Groups Part change?

Firms that apply proportional consolidation of a participation. The amended Article 18(5) adds voting rights alongside share of capital, and SS15/13 sets out how much to consolidate when the two proportions differ. The 20% participation threshold is unchanged.

Do the credit-risk corrections add new capital requirements?

No. They clarify the Basel 3.1 rules the PRA finalised in PS1/26 before those rules apply on 1 January 2027, covering due diligence on the selected credit rating under Article 120(4), the interaction of the Article 121(2), 121(4) and 121(5) treatments, and the slotting exposure-value point in Article 151(5). They correct the drafting; they do not recalibrate the capital numbers.

What is the change to the O-SII designation exercise?

Proposal 4 changes the O-SII designation exercise from an annual assessment to an assessment at least once every two years, while allowing the PRA to review the O-SII list at any time if structural changes occur. O-SII buffers continue to be set at least annually. Proposal 5 amends the definition of firms in scope of the O-SII buffer in SoP1/16 and SoP4/16. Both amendments took effect on 29 July 2026.

Related Articles

• PRA Basel 3.1 Market Risk and IMA Adjustments: how the UK is implementing the trading-book and internal-model rules that LIAF02/26 cross-refers to.
• Macroprudential Buffer Stacking: where the countercyclical capital buffer sits in the combined buffer requirement.
• CRR3 Credit Risk Standardised Approach ECAI Due Diligence: the EU counterpart to the UK credit-rating due diligence the correction clarifies.
• DORA ICT Incident Reporting: the EU regime that runs parallel to the UK operational-incident reporting rules being corrected.
• EBA 2026 O-SII List and Capital Buffer Obligations: how systemically important institutions are identified and buffered in the EU.

Key Takeaways

• PRA LIAF02/26, published 29 July 2026, finalises LIAC01/26 plus minor corrections and touches Rulebook Parts firms are already rebuilding for 1 January 2027.
• Commencement splits across 29 July 2026, 30 July 2026, 1 January 2027 and 18 March 2027; treat each correction on its own date.
• The Groups Part change adds voting rights to Article 18(5) proportional consolidation; SS15/13 explains how much to consolidate when voting rights and capital differ, and the 20% threshold is unchanged.
• The countercyclical buffer technical standard swaps CRR cross-references for PRA Rulebook references and aligns the “trading book exposures” definition; the calculation is unchanged.
• Four Basel 3.1 credit-risk points are corrected before PS1/26 applies: Article 120(4) due diligence, Articles 121(2) and 121(5), and Article 151(5) slotting exposures.
• Operational-incident corrections change the branch perimeter for third country branches and UK branches of overseas banks from 18 March 2027; the “netting set” glossary cross-reference is corrected from 1 January 2027.

Sources and References

• Bank of England / PRA, LIAF02/26: Low Impact Amendments Finalisation July 2026 (published 29 July 2026), with its appendices for the Groups, countercyclical capital buffer technical standard, Glossary, notifications and operational incident reporting, and credit risk amendment instruments.
• Bank of England / PRA, PS1/26: Implementation of Basel 3.1: Final rules, most rules applicable from 1 January 2027 with the market-risk internal model approach from 1 January 2028.
• Bank of England / PRA, PS3/26: Restatement of CRR requirements, 2027 implementation, final, the basis for the Groups Part Article 18(5) and “netting set” changes.
• Bank of England / PRA, PS7/26, Operational resilience: Operational incident and third-party reporting (March 2026).
• Bank of England / PRA, SoP1/16: The PRA’s approach to identifying O-SIIs, and SoP4/16 on the implementation of the O-SII buffer, amended by LIAF02/26 with effect from 29 July 2026.
• PRA Rulebook (Groups; Credit Risk: Standardised Approach (CRR); Credit Risk: Internal Ratings Based Approach (CRR); Notifications; Regulatory Reporting; Glossary) and SS15/13 and SS10/13: www.prarulebook.co.uk.

How to work LIAF02/26 into the 2027 build

Treat LIAF02/26 as a checklist against the 1 January 2027 programme rather than a standalone task. Confirm whether your consolidation logic touches voting-rights participations, whether your buffer engine reads the corrected cross-references, whether the four credit-risk points sit inside your Basel 3.1 configuration, and which branch entities the March 2027 incident-reporting corrections capture. The cost of missing one is a calculation or notification quietly following the pre-correction wording after the date it was meant to change.

Disclaimer: The information on RegReportingDesk.com is for educational and informational purposes only. It does not constitute legal, regulatory, tax, or compliance advice. Always consult your compliance officer, legal counsel, or the relevant supervisory authority for guidance specific to your institution.