Simpler but stronger: what the SDDT regime means for smaller UK lenders

The Prudential Regulation Authority (PRA) published PS4/26 on 20 January 2026, confirming the simplified capital regime for Small Domestic Deposit Takers (SDDTs) and the additional liquidity simplifications that had been issued in near-final form as PS20/25 the previous October.¹ The regime takes effect on 1 January 2027, and it gives small UK banks and building societies a capital regime built for their size rather than a scaled-down version of the rules for large international banks. The proposals behind it came from CP7/24, The Strong and Simple Framework.

A proportional approach to capital

The PRA’s Strong and Simple initiative recognises a longstanding imbalance: the UK’s smallest deposit takers are subject to prudential rules designed for large, internationally active banks. While the Basel 3.1 framework strengthens resilience across the sector, its complexity can place disproportionate strain on smaller institutions with simple business models and limited international exposure. Our Basel 3.1 summary covers that full package.

The SDDT regime aims to resolve that tension by retaining the strength of the Basel framework while removing elements that add cost and complexity without meaningful prudential benefit.

Who qualifies as an SDDT?

Eligibility for the regime is limited to small, domestically focused firms. To qualify, a firm must:

• Have group total assets of £20 billion or less. The PRA amended SoP2/23 in April 2026 to help applicants with non-UK parent undertakings work out which entities count towards that test, which is where applications had been getting stuck²
• Be predominantly UK-focused, with only a small share of exposures outside the UK
• Maintain a simple business model, with limited or no trading activity
• Operate without significant foreign operations or complex group structures

Participation is optional, and eligible firms opt in through a Modification by Consent process operated under SoP2/23. A firm that wants to leave should engage its supervisors early and explain why before asking the PRA to revoke its modification, and while nothing prohibits coming back, SoP2/23 records that the PRA would not expect firms to exit and re-enter the regime frequently. Firms sitting inside an international group should read that April 2026 amendment before applying.²

How the SDDT regime simplifies the rules

The SDDT framework restructures the entire capital stack (Pillars 1 and 2, buffers, ICAAP, and reporting) to create a coherent, proportionate system.

1. Pillar 1: simplified capital requirements

SDDTs will adopt the Basel 3.1 standardised approaches for credit and operational risk, but with key simplifications:

• Credit risk: firms will use the Simplified Standardised Approach (SSA), a version of Basel’s Standardised Approach that removes internal models and external ratings. Risk weights are driven by loan-to-value (LTV) bands and exposure class, eliminating model variability and complex due diligence obligations.
• Market risk: SDDTs are exempt from the Fundamental Review of the Trading Book (FRTB). Only simple interest-rate and FX positions are in scope, with fixed capital add-ons replacing sensitivity-based measures.
• Operational risk: all SDDTs will use the Business Indicator (BI) approach, a single, income-based calculation that removes the need for internal loss data or advanced modelling.

Together, the simplifications to credit, market and operational risk requirements remove some of the most burdensome elements of Basel 3.1 while preserving risk sensitivity and comparability across firms. The SDDT start date is tied to the Basel 3.1 timetable. The PRA, in consultation with HM Treasury, announced on 17 January 2025 that UK implementation of the Basel 3.1 standards would be delayed by a year to 1 January 2027, citing uncertainty over when other major jurisdictions would adopt them alongside competitiveness and growth considerations. It confirmed the final rules in PS1/26 on the same day it published PS4/26.³

2. Pillar 2A: simplified and transparent

SDDTs get their own Pillar 2A methodology, simplifying the treatment of credit, concentration, and operational risk. The aim isn’t to lower capital standards, but to make the process more transparent and predictable. Firms will still need to demonstrate adequate capital for idiosyncratic risks, but with reduced modelling expectations and clearer supervisory dialogue.

An SDDT’s own Pillar 2A methodology is worth separating from the PRA’s wider Pillar 2A review, which reached final policy as PS15/26 in May 2026. That document states that its credit risk chapter "does not apply to firms that opt in to the SDDT regime", with one consequential exception. It instead updates the two instruments an SDDT actually works to: SoP5/25 on Pillar 2 methodology for SDDTs, and SS4/25, the SDDT version of the statement on the ICAAP and the Supervisory Review and Evaluation Process (SREP).⁴ An SDDT therefore reads PS15/26 for changes to its own documents rather than for the mainstream methodology.

3. Buffers and stress testing

The most significant change is a Single Capital Buffer (SCB), which replaces the Capital Conservation Buffer (CCoB), the Countercyclical Buffer (CCyB), and the PRA buffer.

The SCB is calibrated using a Non-Cyclical Stress Test (NCST), designed to ensure resilience without the volatility of annual system-wide stress exercises. This stability allows small firms to hold lower management buffers, freeing up capital that might otherwise be trapped as "buffers on buffers".

4. ICAAP and disclosures

Under the SDDT regime, the Internal Capital Adequacy Assessment Process (ICAAP) becomes more proportionate. Our ICAAP guide covers the standard process this simplifies. Documentation, stress testing, and frequency are all simplified, but firms must still evidence sound capital planning and risk governance. Two specifics matter here. SDDTs work to their own supervisory statement, SS4/25, rather than sharing SS31/15 with the rest of the sector. And the frequency relief is the part of the regime that is already live, having taken effect on 20 January 2026 alongside the reverse stress testing expectations, rather than waiting for 2027.¹

Disclosure requirements (Pillar 3) are similarly scaled down, and annual, standardised templates replace the extensive quarterly Basel disclosures. The sequencing is worth noting: liquidity returns for SDDTs have already been simplified, while the capital reporting simplifications arrive with the regime on 1 January 2027. The PRA’s discussion paper on future banking data treats this work as the approach its wider reporting reform would draw on, which suggests the first tranche rather than the whole of that reform.⁵

Implementation timeline

The regime was finalised in PS4/26 on 20 January 2026, and it arrives in two stages rather than one. Paragraph 1.15 confirms that the capital regime itself takes effect on 1 January 2027. Three things took effect earlier, on 20 January 2026, the day the policy statement was published: the changes to SoP2/23, the rules and expectations on how often a firm must update its ICAAP, including reverse stress testing, and the equivalent expectations for the Internal Liquidity Adequacy Assessment Process (ILAAP).¹ So the relief on assessment cycles is available now, while the capital stack waits for the Basel 3.1 cutover. A transition period allows firms to migrate from the existing Interim Capital Regime and adapt systems, data, and governance structures.

Firms will need to map data, reconcile RWAs, and align governance before the cutover.

What this means for small lenders

For building societies and regional banks, the SDDT regime offers three tangible benefits:

• Cost efficiency: simpler rules reduce the need for expensive model validation, data infrastructure, and consultant-heavy submissions.
• Predictability: the Single Capital Buffer and non-cyclical stress test offer greater stability in capital planning.
• Focus on governance: the framework prioritises oversight and prudence over technical modelling, reinforcing the idea that good governance, not complexity, underpins resilience.

"Simpler" doesn’t mean "lighter-touch".

Supervisory engagement will not soften, with the PRA expecting strong internal controls and clear evidence of capital adequacy. Firms should view the SDDT regime as an opportunity to enhance clarity and efficiency rather than dilute prudential rigour.

A chance to strengthen the sector

The SDDT regime could reshape how smaller UK lenders engage with prudential regulation. By easing unnecessary burdens while maintaining resilience, the PRA hopes to support competition and diversity in the UK banking market, and to encourage sustainable growth among smaller, member-focused institutions.

At Gini, we work closely with UK lenders to interpret and apply new prudential frameworks like the Strong and Simple regime. Our team supports clients through the full process, from assessing SDDT eligibility and preparing data for the Simplified Standardised Approach, to updating ICAAPs and governance documentation.

We also deliver tailored training sessions for boards, risk, and finance teams to ensure firms not only comply, but understand how the new regime fits within their long-term capital and growth strategies.

Frequently asked questions