The CHAPS payment system underpins many of the largest financial transactions in the UK, enabling high-value transfers at speed. While the system has been in place for decades, the Bank of England has now mandated that fully structured addresses must be included in all CHAPS payments, aligning with the ISO 20022 standard.
For retail banks, complying with this new requirement will be essential as the initial deadline of November 2026 approaches.
Why address data quality matters in financial transactions
Traditional payments have long lacked consistently formatted address data, and this carries real, well-documented consequences. Sanctions screening, anti-money laundering (AML) checks, and operational repair processes all depend on address information that is accurate, complete, and structured. When data is fragmented or poorly formatted, this adds cost, introduces risk, and slows down legitimate transactions.
The financial services sector’s move toward richer, structured data through ISO 20022 directly acknowledges this problem. As financial crime continues to grow in sophistication and scale, trusted address data will become increasingly important. A payment that cannot be accurately matched to a verified person at a verified address is a payment that carries risk. For compliance and fraud teams, this verified address data will bring confidence in their decision-making.
How OS data enables ISO 20022 compliance
Ordnance Survey's Royal Mail Address data contains a complete set of standardised UK postal addresses, with data fields aligned to the ISO 20022 standard, ensuring compatibility from day one. Each address is structured to a consistently high standard to meet the Bank of England regulatory requirements and the PMPG Structured Address standard.
Beyond compliance
Importantly, each address can be anchored to a Unique Property Reference Number (UPRN) – a unique identifier assigned to every addressable location in Great Britain. This acts as a golden thread, enabling unambiguous data linking, matching, and validation across systems.
For banks, this means the ability to cross-reference address data with confidence, reducing the risk of false positives in fraud detection and improving the accuracy of Know Your Customer (KYC) processes.
Beyond compliance, the UPRN introduces a new level of efficiency. When matching addresses across internal systems or third-party datasets, the UPRN removes ambiguity and accelerates the process. Building-level data – accessible via the UPRN – can further support fraud and KYC workflows, giving teams a richer picture of the property and its context. This address data will also ensure alignment with global and cross-border payments, supporting a single global data model. It is not just a compliance box to tick, but will actively contribute to safer, faster, more informed financial decisions.
Act now to get ahead
With November 2026 approaching, the preparation window is narrowing. Switching to this structured address data is not a change that can be made overnight, requiring integration work and, in many cases, a review of how address information is captured at the point of customer onboarding.
Institutions that move early – integrating OS location data into their processes through trusted OS Partners – will be better placed for compliance. Ordnance Survey's data provides a robust, standards-aligned foundation that supports fraud prevention, customer verification, and operational efficiency well beyond the immediate deadline.
To discuss your ISO 20022 migration and take the first step, contact Ordnance Survey.
