FRS 102 vs IFRS: Key Differences for UK Accountants

For UK and Irish accountants, one of the most practical questions is when to apply FRS 102 (UK GAAP) and how it differs from full IFRS. The two frameworks share a lot of DNA, but they differ in scope, complexity and several specific areas — and a major 2024 update, effective from January 2026, has just narrowed some of the biggest gaps. This guide explains the key differences and what the 2026 changes mean. For deeper study, see our financial reporting CPD.

What is FRS 102?

FRS 102 is the principal financial reporting standard in the UK and Republic of Ireland — the core of "UK GAAP". It's a single, proportionate standard designed for entities that don't apply full IFRS, offering a more concise rulebook with simplifications and policy choices suited to private and medium-sized businesses. Full IFRS, by contrast, is a comprehensive suite of separate standards used by listed groups and larger international entities.

The big-picture difference

The clearest distinction is scale and detail. IFRS is comprehensive, prescriptive and disclosure-heavy — appropriate for entities accountable to global capital markets. FRS 102 is deliberately lighter: fewer disclosures, more accounting policy choices, and a single document rather than dozens of standards. For many private companies, that proportionality is the whole point — they get robust, recognised accounts without the full IFRS compliance burden.

The 2026 periodic review: the gap narrows

The FRC's Periodic Review 2024 made significant amendments to FRS 102, effective for accounting periods beginning on or after 1 January 2026 (with early adoption permitted). Two changes stand out because they pull FRS 102 much closer to IFRS:

• Revenue — a new five-step revenue model aligned to IFRS 15 (identify the contract, identify performance obligations, determine the transaction price, allocate it, and recognise revenue as obligations are satisfied), with some simplifications. This replaces the old Section 23 approach.
• Leases — on-balance-sheet lease accounting for lessees, aligned to IFRS 16. Lessees now recognise a right-of-use asset and a lease liability for most leases, with exemptions for short-term and low-value leases, and the old operating/finance lease split disappears for lessees.

These are not cosmetic: by bringing leases on balance sheet, the changes affect metrics like EBITDA and net debt, which can ripple through to debt covenants and performance-based pay. The FRC has estimated the amendments affect millions of UK businesses, so preparation matters.

Key differences that remain

Even after 2026, FRS 102 and IFRS are not the same. Notable enduring differences include:

• Goodwill — under FRS 102, goodwill (and intangibles) are amortised over their useful life, with a cap where that life can't be reliably estimated. Under IFRS, goodwill is not amortised but tested for impairment annually.
• Financial instruments — FRS 102 uses a simpler "basic vs other" classification and does not apply the full IFRS 9 expected-credit-loss model, so impairment of receivables is less complex.
• Development costs — FRS 102 offers a policy choice to capitalise or expense qualifying development costs, whereas IFRS generally requires capitalisation once the criteria are met.
• Disclosure — FRS 102 requires considerably less disclosure overall, part of its proportionate design.

Which framework applies to you?

In broad terms, UK listed groups must prepare their consolidated accounts under IFRS, while a great many private companies use FRS 102 (or, for the smallest, FRS 105). Some entities have a choice. The right framework depends on size, ownership, group structure and the needs of users of the accounts — so it's worth confirming your specific obligations rather than assuming.

How to prepare for the 2026 changes

If you report under FRS 102, the lease change in particular needs early attention. A sensible run-up: identify all your leases and gather the data needed to calculate right-of-use assets and lease liabilities; model the impact on EBITDA, net debt and any affected covenants or bonus arrangements, and flag issues to lenders or stakeholders early; review revenue contracts against the new five-step model to spot where the timing of recognition could shift; and update systems and accounting policies before the first affected period begins. Starting now turns a potentially disruptive transition into a managed one.

Frequently asked questions

Is FRS 102 the same as IFRS?

No. FRS 102 is a single, more concise UK and Ireland standard with simplifications and policy choices; IFRS is a larger, more detailed suite. The 2026 changes narrow the gap on revenue and leases but differences remain.

What changed in FRS 102 from 2026?

A new IFRS 15-style five-step revenue model and on-balance-sheet lease accounting for lessees (IFRS 16-style, with exemptions), effective for periods beginning on or after 1 January 2026.

How is goodwill treated differently?

FRS 102 amortises goodwill over its useful life; IFRS does not amortise goodwill but tests it for impairment annually.

Who uses FRS 102?

Many UK and Irish private and medium-sized entities, while listed groups apply full IFRS for their consolidated accounts.

Stay current with Learnsignal

With the 2026 changes reshaping UK GAAP, keeping up to date matters. Learnsignal's financial reporting CPD helps UK and Irish finance professionals stay on top of FRS 102, IFRS and the differences between them, with flexible, expert-led learning.