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IFRS 1

First-time Adoption of International Financial Reporting Standards

IFRS 1 sets out the procedures an entity must follow when it adopts IFRS Standards for the first time as the basis for preparing its general purpose financial statements, requiring a complete set of financial statements covering the first IFRS reporting period and the preceding comparative year, generally prepared as if IFRS had always applied, subject to specific mandatory exceptions and optional exemptions. [S1]

Effective 2004-01-01Related: IAS 1 · IAS 8 · IFRS 3 · IAS 21

Overview

IFRS 1 applies to an entity's first IFRS financial statements — the first set in which the entity makes an explicit and unreserved statement of compliance with IFRS Standards. [S1] The core requirement is that an entity prepares an opening IFRS statement of financial position at the date of transition to IFRS (the beginning of the earliest comparative period presented), recognising all assets and liabilities IFRS requires, derecognising items IFRS does not permit, reclassifying items consistent with IFRS classification, and measuring all recognised assets and liabilities in accordance with IFRS, generally applying Standards retrospectively; any resulting adjustment compared to previous GAAP carrying amounts is recognised directly in retained earnings (or another appropriate equity category) at the transition date, not in profit or loss. [S2]

Why it matters

For any Nigerian entity converting from Nigerian GAAP, informal bookkeeping, or another local basis to full IFRS, IFRS 1 is the standard that governs the entire conversion exercise day-to-day: it determines what date the 'opening IFRS balance sheet' is struck at, which prior transactions must be reconstructed retrospectively, and which limited, practical exemptions are available to avoid disproportionately costly full retrospective restatement in specific areas (such as business combinations, cumulative translation differences, or fair value as deemed cost for certain assets). Getting the transition date and exemption elections wrong at the outset creates a flawed starting point that then distorts every subsequent reporting period.

Scope

Applies to an entity's first IFRS financial statements and each interim financial report, if any, presented under IAS 34 for part of the period covered by those first IFRS financial statements. It does not apply to an entity already reporting under IFRS Standards; an entity that applied IFRS in a previous period but whose most recent previous financial statements did not include an explicit and unreserved statement of IFRS compliance may choose to apply either IFRS 1 or IAS 8 (as if it had never stopped applying IFRS), and IFRS 1 can, in specified circumstances, be applied more than once by the same entity (a 'repeated application').

Key definitions

term
First-time adopter
definition
An entity that presents its first IFRS financial statements.
term
Date of transition to IFRS Standards
definition
The beginning of the earliest period for which an entity presents full comparative information under IFRS Standards in its first IFRS financial statements.
term
Opening IFRS statement of financial position
definition
An entity's statement of financial position at the date of transition to IFRS Standards.
term
Previous GAAP
definition
The basis of accounting that a first-time adopter used immediately before adopting IFRS Standards.
term
Mandatory exceptions
definition
Areas in which IFRS 1 prohibits retrospective application of IFRS Standards, generally because retrospective application would require the use of hindsight.
term
Optional exemptions
definition
Areas in which IFRS 1 permits (but does not require) a first-time adopter to avoid full retrospective application, because the cost of complying would likely exceed the benefit to users.

Recognition

In the opening IFRS statement of financial position, a first-time adopter recognises all assets and liabilities IFRS Standards require to be recognised, does not recognise items as assets or liabilities if IFRS Standards do not permit such recognition, reclassifies items recognised under previous GAAP as one type of asset, liability or equity component but as a different type under IFRS, and applies IFRS in measuring all recognised assets and liabilities. This is applied consistently for all periods presented in the first IFRS financial statements, using the same accounting policies throughout, and those policies must comply with each IFRS Standard effective at the end of the entity's first IFRS reporting period (not the standards in effect at earlier dates, except to the extent IFRS 1 itself provides transition relief).

Initial measurement

Assets and liabilities are measured in the opening IFRS statement of financial position in accordance with the specific IFRS Standard applicable to each item, generally as if that Standard had always applied (full retrospective application), except where a mandatory exception applies (for example, hedge accounting, non-controlling interest measurement in a way that would require hindsight, or certain classification and measurement decisions for financial assets that must be made on the basis of facts and circumstances at the date of transition) or where the entity elects one of the optional exemptions IFRS 1 provides (such as using fair value, or a previous GAAP revaluation, as deemed cost for an item of PPE, investment property, or an intangible asset, rather than reconstructing full historical cost).

Subsequent measurement

After the opening IFRS statement of financial position is established, all recognised assets and liabilities are subsequently measured under the ordinary requirements of the applicable IFRS Standard, exactly as for any other entity already reporting under IFRS; IFRS 1's role is limited to the transition itself and does not create any ongoing, entity-specific measurement basis beyond the first IFRS financial statements. Estimates made under previous GAAP at the date of transition are generally not revised for information that became available only after that date (to avoid the use of hindsight), unless those previous-GAAP estimates were themselves in error or reflected accounting policies not consistent with IFRS.

Presentation

An entity's first IFRS financial statements include at least three statements of financial position (opening, comparative period-end, and current period-end), two statements of profit or loss and other comprehensive income, two statements of cash flows, two statements of changes in equity, and related notes, including comparative information for all periods presented. A reconciliation of equity reported under previous GAAP to equity under IFRS is required at both the date of transition and the end of the last period presented under previous GAAP, along with a reconciliation of total comprehensive income under previous GAAP to total comprehensive income under IFRS for the latest period presented under previous GAAP.

Disclosure checklist

  • An explanation of how the transition from previous GAAP to IFRS Standards affected the entity's reported financial position, financial performance and cash flows.
  • Reconciliations of equity reported under previous GAAP to equity under IFRS Standards, at the date of transition and at the end of the latest period presented under previous GAAP.
  • A reconciliation of total comprehensive income under IFRS Standards for the latest period presented under previous GAAP, to total comprehensive income under previous GAAP for that same period (or profit or loss if the entity did not previously present total comprehensive income).
  • If the entity became aware of errors made under previous GAAP, disclosure of those errors distinguished from changes in accounting policy.
  • Details of which optional exemptions were elected and how they were applied, and any mandatory exceptions applied.
  • If the entity presented a cash flow statement under previous GAAP, material adjustments to that statement.

Practical treatment

The practical starting discipline is fixing the exact date of transition (the beginning of the earliest comparative period to be presented) before any other conversion work begins, since every subsequent reconstruction anchors to that date. From there, the most consequential early decision is which optional exemptions to elect — most commonly, using fair value or a previous revaluation as deemed cost for property, plant and equipment where reconstructing full historical cost and depreciation history is impracticable or prohibitively costly, and electing not to restate past business combinations retrospectively under IFRS 3. Nigerian entities converting from informal or cash-basis bookkeeping (rather than a codified previous GAAP) should also expect a larger volume of items requiring genuine reconstruction, since there may be no coherent 'previous GAAP' figures to reconcile from in the first place. See nigeria_notes for the specific Nigerian conversion context.

Common mistakes

  • Using an incorrect or inconsistent date of transition, rather than fixing it precisely as the beginning of the earliest comparative period to be presented.
  • Failing to prepare the required opening IFRS statement of financial position at the transition date as a distinct, reconciled starting point.
  • Applying hindsight to previous-GAAP estimates at the transition date, using information that only became available afterwards.
  • Omitting the required equity and total comprehensive income reconciliations between previous GAAP and IFRS.
  • Electing an optional exemption without documenting the basis for the election and how it was applied, leaving the transition difficult to audit or explain to users.
  • Restating a business combination retrospectively under IFRS 3 when the entity elected (or should have elected, given the cost/benefit trade-off) not to do so under IFRS 1's business combinations exemption.

CFO checklist

  • Fix and document the precise date of transition to IFRS before beginning detailed conversion work.
  • Prepare a complete opening IFRS statement of financial position at the transition date, reconciled to previous GAAP (or previous informal records) equity.
  • Evaluate and document each available optional exemption (business combinations, cumulative translation differences, deemed cost for PPE/investment property/intangibles, and others) and the basis for electing or not electing each.
  • Identify any mandatory exceptions relevant to the entity (e.g. hindsight-related restrictions) and confirm they have been correctly applied.
  • Prepare the required equity and total comprehensive income reconciliations between previous GAAP and IFRS for disclosure.
  • Coordinate the first IFRS financial statements' transition disclosures with CAMA 2020 statutory filing requirements and board sign-off timelines.

FAQs

q
We're converting from informal, cash-basis bookkeeping rather than a codified 'previous GAAP' — does IFRS 1 still apply?
a
Yes. IFRS 1 applies to any entity's first IFRS financial statements regardless of how rigorous or codified its previous basis of accounting was; 'previous GAAP' is simply whatever basis the entity used immediately before adopting IFRS, and the same opening IFRS statement of financial position and reconciliation requirements apply, though the volume of reconstruction needed may be larger where previous records were informal.
q
Do we need to restate every historical business combination retrospectively under IFRS 3 as part of our IFRS 1 transition?
a
Not necessarily. IFRS 1 provides an optional exemption allowing a first-time adopter not to apply IFRS 3 retrospectively to business combinations that occurred before the date of transition, which most entities elect given the cost and complexity of full retrospective restatement; if elected, this must be applied consistently to all business combinations before the transition date, not selectively.
q
Can we use current fair value instead of reconstructing historical cost for our property, plant and equipment?
a
Yes, IFRS 1 permits an optional 'deemed cost' exemption allowing an entity to measure an item of PPE (or investment property, or certain intangible assets) at its fair value at the date of transition, using that fair value as its deemed cost going forward, rather than reconstructing a full historical cost and accumulated depreciation history.

Nigeria application notes

Regulatory overlay

IFRS 1 applied to Nigerian public interest entities during Nigeria's phased national IFRS adoption process, which the IFRS Foundation records as having an effective date of 1 January 2012, phased by entity category (significant public interest entities, other public interest entities, and small and medium-sized entities adopting in subsequent phases); it continues to apply today to any Nigerian entity newly converting to IFRS for the first time, most commonly an SME graduating from a simplified or informal accounting basis, or a company preparing for an NGX listing or foreign investment that requires full IFRS financial statements. [S3]

Tax interaction (Nigeria)

An IFRS 1 transition adjustment recognised directly in opening retained earnings (rather than profit or loss) does not, in itself, retrospectively alter a Nigerian entity's already-filed companies income tax returns for periods before the transition date; the tax treatment of transition adjustments, and how the entity's post-transition IFRS-based figures feed into its current and future companies income tax computations at the standard illustrative rate of 30% (subject to the small-company exemption and other qualifying conditions) under the Nigeria Tax Act 2025, should be assessed separately with current NRS guidance rather than assumed to follow the accounting transition automatically. [S6][S_TAX1][S_TAX2] Nigerian rates, thresholds, exemptions, incentives and filing rules referenced in this file (including CIT, VAT, withholding tax categories, sector-specific regulatory capital and licensing requirements, and the small-company threshold) should be independently verified against the Nigeria Tax Act 2025, the Nigeria Tax Administration Act 2025, NAICOM/NUPRC/Mining Cadastre guidance, and current NRS practice at the reporting or filing date, since thresholds, rates and reliefs are subject to periodic revision and to sector- or entity-specific qualifying conditions. This file does not constitute legal or tax advice. [S_TAX1][S_TAX2]

FX considerations

Nigerian entities converting to IFRS with foreign operations or foreign-currency-denominated historical transactions commonly elect the IFRS 1 exemption to deem cumulative foreign currency translation differences as zero at the date of transition, avoiding the need to reconstruct a full historical naira/foreign-currency translation history; where this exemption is elected, any gain or loss on a subsequent disposal of that foreign operation excludes translation differences arising before the transition date, which should be clearly documented for future reference.

SME practical note

Nigerian SME clients converting to IFRS for the first time (commonly ahead of a bank facility renewal, an equity raise, or a group reporting requirement) frequently lack a codified previous GAAP basis at all, having kept informal or cash-basis records; Outliers treats the IFRS 1 opening balance sheet exercise as the foundational deliverable of any such engagement, since getting the transition date, exemption elections, and opening reconciliation right determines the reliability of every subsequent reporting period built on top of it.

Common Nigerian pitfalls

  • Treating an informal or cash-basis prior accounting history as if it were already 'previous GAAP' in the IFRS 1 sense, without a genuine reconciliation exercise to establish the opening IFRS balance sheet.
  • Failing to document which optional exemptions (deemed cost for PPE, business combinations, cumulative translation differences) were elected and why.
  • Assuming a transition adjustment recognised in opening retained earnings automatically amends a previously filed Nigerian tax return for the same period.
  • Setting an inconsistent or undocumented date of transition, undermining the reliability of the opening IFRS statement of financial position.

FRC pronouncements

No FRCN pronouncement specific to IFRS 1 transition mechanics has been identified; the relevant Nigerian regulatory context is FRCN's original phased national adoption roadmap (now largely historical for entities that converted during the initial 2012-era transition) alongside CAMA 2020's ongoing statutory financial statement and true-and-fair-view requirements that any newly converting Nigerian entity must also satisfy. [S3][S4] Board approval of the first set of IFRS financial statements (and the underlying opening IFRS balance sheet judgements) should follow the same governance and resolution mechanics applicable to any other set of Nigerian statutory accounts under CAMA 2020. [S5]

Worked examples

Electing the deemed cost exemption for property, plant and equipment

A Nigerian manufacturing company converting to IFRS for the first time has a factory building with a previous-GAAP carrying amount of ₦80,000,000, based on incomplete historical cost records. At the date of transition, an independent valuer determines the building's fair value to be ₦150,000,000. The company elects to use this fair value as deemed cost under the IFRS 1 exemption.

Facts

Workings

Adjustment to restate the building to its deemed cost at the transition date: 150,000,000 - 80,000,000 = 70,000,000

This adjustment is recognised directly in opening retained earnings (or another appropriate equity category) at the date of transition, not in profit or loss.

Going forward, the building's deemed cost of 150,000,000 becomes its new cost basis under IAS 16, depreciated over its remaining useful life from the transition date.

Journal entries

Restate the factory building to its fair value at the date of transition, using the IFRS 1 deemed cost exemption, with the adjustment recognised directly in opening retained earnings.

AccountDr (₦)Cr (₦)
Property, plant and equipment – factory building70,000,000
Retained earnings (opening balance, date of transition)70,000,000

Reconciling previous GAAP equity to IFRS equity at the date of transition

The same company's previous-GAAP total equity at the date of transition was ₦500,000,000. In addition to the ₦70,000,000 PPE deemed cost adjustment, the company also recognises a ₦12,000,000 previously unrecognised expected credit loss allowance on trade receivables required under IFRS 9, and derecognises a ₦5,000,000 previously capitalised cost that does not meet any IFRS asset recognition criteria.

Facts

Workings

IFRS equity at the date of transition: 500,000,000 + 70,000,000 - 12,000,000 - 5,000,000 = 553,000,000

Sources & citations

  1. [S1]IFRS 1 First-time Adoption of International Financial Reporting Standards — IFRS Foundationaccessed 2026-07-18
  2. [S2]IFRS 1 First-time Adoption of International Financial Reporting Standards — IFRS in Brief — Moore Globalaccessed 2026-07-18
  3. [S3]IFRS - Use of IFRS Standards by jurisdiction: Nigeria — IFRS Foundationaccessed 2026-07-18
  4. [S4]Highlights of the provisions relating to financial statements, audit and annual returns in CAMA 2020 — Dentons ACAS-Lawaccessed 2026-07-18
  5. [S5]Navigating Corporate Decisions in Nigerian Companies Limited by Shares Under CAMA 2020 — The Legal Troveaccessed 2026-07-18
  6. [S6]Nigeria - Corporate - Taxes on corporate income — PwC Worldwide Tax Summariesaccessed 2026-07-18
  7. [S_TAX1]Nigeria Tax Act, 2025 has been signed – highlights — EY Globalaccessed 2026-07-18
  8. [S_TAX2]Nigeria's 2025 Tax Reform Acts Explained: Key Changes — Baker Tilly Nigeriaaccessed 2026-07-18
Last reviewed 2026-07-18 · Reviewer: Rafiu Olawuyi, FCA (Author / Technical Reviewer)