FCA Cuts UK Transaction Reporting to 52 Fields, Targets £100M Savings

The FCA estimates UK firms spend £493 million a year on transaction reporting, and its finalised overhaul — policy statement PS26/15 — is projected to cut that bill by more than £100 million annually. These are the most significant changes to UK MiFIR transaction reporting since MiFID II took effect in 2018. But anyone who lived through EMIR Refit knows simplification rarely means less work.

What changes, in numbers?

The reportable field count falls from 65 to 52, and trading venues drop 11 instrument reference data fields. Scope narrows too. Roughly seven million instruments tradable only on EU venues leave UK reporting requirements entirely.

The biggest structural shift: FX derivatives exit MiFIR transaction reporting altogether. The FCA considers UK EMIR the more appropriate framework for that data. The move should reduce costs for more than 400 UK firms while removing duplication between regimes.

For retail FX and CFD brokers, that is arguably the headline change. Reporting the same transaction under two regimes, in different formats, to different destinations, was one of the least defensible features of the UK framework.

Back-reporting obligations also shrink. The maximum correction window for historical errors falls from five years to three. The corporate-events exemption widens, though IPOs, secondary offerings, placings and debt issuance stay reportable.

Why does FIRDS as golden source matter?

The FCA confirmed its Financial Instruments Reference Data System becomes the definitive source for determining reportability, with a seven-day cut-off after execution. In practice, firms stop checking whether an instrument entered FIRDS after the fact.

That shifts weight onto data governance. Firms must know where reference data comes from, how often it refreshes, and who owns it internally.

For derivatives on indices, where reportability is genuinely hard to determine, the FCA will allow voluntary over-reporting. Many brokers will find reporting everything cheaper than building systems to filter the edge cases.

Will Conditional Single-Sided Reporting deliver?

PS26/15 introduces a Conditional Single-Sided Reporting framework, letting more firms rely on a counterparty's report instead of filing duplicates. Several buy-side respondents told the FCA they remain sceptical about the benefits. Delegation looks simple. It demands accurate data sharing, defined responsibilities and solid contracts — otherwise firms swap one operational burden for another.

When does each deadline bite?

Full implementation lands on 3 April 2028. Three dates matter before then:

• 3 August 2026 — the FCA adopts a flexible supervisory approach across a defined list of areas; firms adopting changes early face no enforcement action, and the three-year back-reporting limit applies from this date.
• October 2026 — the FCA publishes the draft schema, validation rules and updated guidance, together forming the Transaction Reporting User Pack.
• 3 April 2028 — full effectiveness.

The October 2026 pack is the critical unlock. Until firms hold the revised schema and validation rules, they can scope system changes but cannot build against final specifications.

What happens beyond MiFIR?

The reforms sit inside a wider simplification effort. The FCA and the Bank of England have created a joint Transaction and Post-trade Reporting Industry Harmonisation Taskforce. Its goal: a single framework spanning UK MiFIR, UK EMIR and UK SFTR, built on the principle that firms report data once. Expect further consultations.

How should desks prepare?

The FCA requires no immediate action. Waiting until 2028 is still unwise. Reporting teams and vendors should:

• Review reporting logic against the revised scope, especially FX derivatives and EU-only instruments.
• Assess data governance and reference data sources ahead of FIRDS becoming the reportability arbiter.
• Check that correction and back-reporting procedures reflect the three-year limit already in force.
• Monitor the October 2026 schema release and budget time for system changes.

The savings won't arrive automatically. Firms that spend the next 18 months mapping reporting flows and cleaning data should capture them; those that wait risk turning a simplification exercise into another last-minute compliance project.