FRS 100, the Application of Financial Reporting Requirements, is the UK and Republic of Ireland standard that tells an entity which financial reporting framework to use. Issued by the Financial Reporting Council, it contains no accounting rules of its own. It routes you to one of four destinations — FRS 101, FRS 102, FRS 105, or full UK-adopted IFRS — based on your entity’s size and structure.1Financial Reporting Council. FRS 100 Application of Financial Reporting Requirements Getting the routing right determines what your financial statements look like, what you must disclose, and how much compliance work you face each year.
Who FRS 100 Applies To
FRS 100 applies to virtually every entity that prepares financial statements intended to give a true and fair view under UK or Republic of Ireland legislation. That covers companies, LLPs, charities, and other non-corporate entities.2ICAEW. FRS 100 Application of Financial Reporting Requirements If you file under UK GAAP, FRS 100 is your starting point.
There is one significant boundary. Entities preparing accounts under full UK-adopted IFRS fall outside FRS 100’s framework for those accounts. Listed companies on the London Stock Exchange are required to prepare their consolidated accounts under IFRS, and any UK entity can voluntarily elect IFRS for its statutory accounts. In either case, FRS 100 doesn’t govern those particular financial statements.
Public benefit entities sit inside FRS 100’s scope. Charities, housing associations, and universities generally follow FRS 102 while also applying the sections marked specifically for public benefit entities and any relevant Statement of Recommended Practice for their sector.
The Four Reporting Frameworks
Each of the four destinations FRS 100 can send you to offers a different balance between disclosure detail and compliance simplicity. Which is available depends on your size classification and, in one case, your position within a group.
FRS 105: The Micro-Entities Regime
FRS 105 is the most streamlined option and is available only to entities that qualify as micro-entities under the Companies Act. The accounts consist of a balance sheet and profit and loss account with only limited disclosures — no cash flow statement, no directors’ report requirement, and minimal notes.3ICAEW. FRS 105 The Financial Reporting Standard Applicable to the Micro-entities Regime Certain accounting choices available under FRS 102 are removed: no deferred tax, no equity-settled share-based payment amounts. The simplicity comes at the cost of detail, which can be a drawback when lenders or investors want a fuller picture.
Not every entity below the size thresholds qualifies. Charities, LLPs, and certain other entity types are excluded from the micro-entity regime regardless of size.4Financial Reporting Council. FRS 105 The Financial Reporting Standard Applicable to the Micro-entities Regime
FRS 102: The Default for Most Entities
FRS 102 is the workhorse of UK GAAP. It applies to small, medium-sized, and large entities that don’t adopt full IFRS. The standard is based on the IASB’s IFRS for SMEs, adapted to comply with UK Companies Act requirements.5Financial Reporting Council. FRS 102 The Financial Reporting Standard Applicable in the UK and Republic of Ireland
Small entities benefit from Section 1A, which reduces presentation and disclosure requirements while keeping the same recognition and measurement rules the larger entities follow. Section 1A is a floor, not a ceiling: a small entity can always choose to provide fuller disclosures. Medium-sized and large entities apply FRS 102 in full.
FRS 101: The Reduced Disclosure Framework
FRS 101 sits in a specific niche. It’s available to qualifying entities within a group, meaning a member of a group whose parent prepares publicly available consolidated financial statements giving a true and fair view, where the entity is included in that consolidation.6ICAEW. FRS 101 Reduced Disclosure Framework Both subsidiaries and parents can qualify.
Entities using FRS 101 apply the recognition and measurement principles of full IFRS with significant disclosure exemptions, since the detail is already in the parent’s consolidated accounts.7Financial Reporting Council. FRS 101 Reduced Disclosure Framework It’s popular with subsidiaries of IFRS-reporting groups because it aligns individual entity accounts with group policies while cutting redundant disclosures.
One procedural point catches some entities out. Shareholders must be notified in writing before the entity switches to the reduced disclosure framework, and shareholders holding 5% or more of allotted shares in aggregate can object and block the election. If you have outside minority holders on the register, factor that notification step in well before your reporting date.
Full UK-Adopted IFRS
Any UK entity, regardless of size, can voluntarily elect to prepare statutory accounts under full UK-adopted IFRS. It’s most common among large multinational groups and entities seeking access to international capital markets. Choosing IFRS steps outside FRS 100 for those accounts.
Size Thresholds That Determine Your Options
Whether FRS 105 or Section 1A of FRS 102 is open to you depends on your size classification under the UK Companies Act 2006. FRS 100 relies on those categories without setting them itself. An entity must satisfy at least two of three criteria — turnover, balance sheet total, and average number of employees — for two consecutive financial years to qualify for a given size category.8ICAEW. UK Company Size Thresholds Have Increased
The thresholds were substantially increased for financial years beginning on or after 6 April 2025. A transitional provision lets you benefit from the higher figures immediately: when determining size for a financial year starting on or after that date, you can treat the new thresholds as if they had applied in the previous year, rather than waiting two consecutive years under the new numbers.8ICAEW. UK Company Size Thresholds Have Increased
Micro-entity limits: turnover not more than £1 million, balance sheet total not more than £500,000, and not more than 10 employees on average. Meet two of the three and, subject to entity type, FRS 105 is available.
Small entity limits: turnover not more than £15 million, balance sheet total not more than £7.5 million, and not more than 50 employees. Small entities can use Section 1A of FRS 102 and generally qualify for audit exemption, though exemption can be lost if the entity is a subsidiary, a public company, or has had shares traded on a regulated market.9GOV.UK. Audit Exemption for Private Limited Companies
Medium-sized entity limits: turnover not more than £54 million, balance sheet total not more than £27 million, and not more than 250 employees. Medium-sized entities apply full FRS 102 without Section 1A simplifications and are subject to statutory audit.
Anything above those figures is large. Large entities apply full FRS 102 with the most extensive disclosure obligations, or they may elect IFRS. There’s no simplified option for a large entity unless it qualifies as a qualifying entity within a group and takes FRS 101.
The GAAP Hierarchy for Gaps in FRS 102
FRS 100 also sets out what to do when FRS 102 doesn’t explicitly address a transaction or event. Rather than leaving preparers to guess, the standard prescribes a four-step sequence:1Financial Reporting Council. FRS 100 Application of Financial Reporting Requirements
- First, apply the requirements and principles within FRS 102 itself, including any section that deals with the issue directly.
- Next, consider requirements and principles in other FRSs that address similar or related issues.
- Then look to the requirements of UK-adopted IFRS.
- Finally, consider generally accepted accounting principles established by custom, practice, or professional consensus, provided they’re consistent with the FRC’s overall framework.
Most entities never move past the first step. The hierarchy matters for unusual or complex transactions: a business combination with an odd structure, or a financial instrument that doesn’t fit neatly into FRS 102’s categories. When you reach into IFRS for guidance under this hierarchy, you’re borrowing the principle to fill a gap, not adopting IFRS wholesale for that transaction.
What Changes in 2026
FRS 100’s role as the routing standard is unchanged, but for accounting periods beginning on or after 1 January 2026 the destination most entities are routed to — FRS 102 — looks quite different.5Financial Reporting Council. FRS 102 The Financial Reporting Standard Applicable in the UK and Republic of Ireland Two changes matter most.
Lease accounting. The old split between operating leases (expensed through profit and loss) and finance leases (on the balance sheet) is replaced by a single model aligned with IFRS 16. All leases go on the balance sheet as a right-of-use asset with a corresponding lease liability, with exemptions only for short-term leases and low-value assets. Profit and loss will show depreciation and interest instead of rent expense, which will move ratios like EBITDA for many entities.
Revenue recognition. A new five-step model aligned with IFRS 15 replaces the previous approach: identify the contract, identify performance obligations, determine the transaction price, allocate it across obligations, and recognise revenue as each obligation is satisfied. For straightforward sales the practical impact is modest. For bundled contracts, long-term projects, or variable pricing, the transition takes real work.
Other notable additions include guidance on uncertain tax positions, enhanced related party disclosures that now cover commitments as well as transactions, and a new fair value measurement section drawing on IFRS 13 principles.
What Happens If You File Under the Wrong Framework
Filing accounts under a framework you don’t qualify for is not just a technical error. Companies House can impose financial penalties where it’s satisfied beyond reasonable doubt that an entity has committed a relevant offence under the Companies Act 2006, using authority granted by the Economic Crime and Corporate Transparency Act 2023.10GOV.UK. Companies House Approach to Financial Penalties
Penalties can be a fixed amount, a daily rate for each day the offence continues, or both. Companies House will typically issue a warning notice first, giving the entity 28 days to file corrected accounts before any penalty is imposed. The amount depends on the seriousness of the offence, whether the entity has committed similar offences in the past five years, and any aggravating or mitigating circumstances. Serious cases may be prosecuted rather than penalised financially.10GOV.UK. Companies House Approach to Financial Penalties
The most common misstep is a growing entity continuing to file micro-entity accounts under FRS 105 after breaching the size thresholds for two consecutive years. If you’re near a boundary, recheck at each reporting date, especially now that the 2025 threshold increases may have shifted your classification either way.