IFRS 3 vs ASC 805: PPA Standards Compared
Key differences between IFRS 3 and ASC 805 purchase price allocation. Recognition rules, measurement, goodwill, and contingent consideration.
Introduction
IFRS 3 and ASC 805 are the two dominant accounting standards governing how companies allocate the purchase price in a business combination. Issued by the IASB and FASB respectively, these standards share a common objective: ensuring that acquired intangible assets are recognised at fair value and that goodwill reflects only the residual premium.
The standards were substantially converged following the 2008 joint revision project, yet important differences remain. These differences affect the amount of goodwill recognised, the treatment of contingent consideration, the measurement of non-controlling interests, and the ongoing impairment testing regime. For cross-border transactions and dual-listed companies, understanding these divergences is not optional — it is essential.
This comparison is written for practitioners navigating PPA engagements where the reporting framework matters to the valuation outcome.
Core Framework: Where the Standards Align
Both standards share the same foundational principles:
Acquisition method required. Both IFRS 3 and ASC 805 mandate the acquisition method (formerly called the purchase method). The acquirer must identify the acquisition date, determine the consideration transferred, and allocate the purchase price to identifiable assets and liabilities at fair value.
Fair value measurement. Both standards require acquired intangible assets to be recognised at fair value. Both reference their respective fair value measurement standards (IFRS 13 and ASC 820) for guidance on how fair value should be determined.
Recognition criteria. Both use the same two-pronged test: an intangible asset acquired in a business combination must be recognised separately from goodwill if it meets either the contractual-legal criterion or the separability criterion.
Measurement period. Both allow a measurement period of up to 12 months from the acquisition date to finalise the provisional purchase price allocation.
The convergence project was largely successful — the core recognition and measurement framework is substantially aligned. The remaining differences, while important, are at the edges rather than the foundation.
Key Differences
Contingent consideration
This is the most significant practical divergence:
| Aspect | IFRS 3 | ASC 805 |
|---|---|---|
| Classification | Always classified as an asset or liability (never equity) unless rare equity-settled arrangement | Classified as equity, asset, or liability based on settlement terms |
| Remeasurement | Liability-classified: remeasured at fair value each period through P&L | Liability-classified: remeasured at fair value through P&L. Equity-classified: not remeasured |
| Impact | All fair value changes hit the income statement, creating earnings volatility | Equity classification avoids post-acquisition P&L impact |
Under IFRS 3, contingent consideration arrangements based on future performance metrics (e.g., earn-outs) almost always require ongoing fair value remeasurement through profit or loss. Under ASC 805, if the arrangement meets equity classification criteria, it is measured at the initial fair value and never remeasured — reducing future earnings volatility.
Non-controlling interests (NCI)
| Aspect | IFRS 3 | ASC 805 |
|---|---|---|
| Measurement choice | Full goodwill method OR proportionate share method (election per transaction) | Full goodwill method required |
| Impact on goodwill | Proportionate method produces lower goodwill | Full goodwill is always recognised |
The NCI measurement choice under IFRS 3 can meaningfully affect the amount of goodwill recognised. A 70% acquisition under the proportionate method recognises only 70% of goodwill; the full goodwill method grosses up to 100%. This affects future impairment testing exposure.
Goodwill impairment testing
| Aspect | IFRS 3 / IAS 36 | ASC 805 / ASC 350 |
|---|---|---|
| Testing level | Cash-generating unit (CGU) or group of CGUs | Reporting unit |
| Methodology | Compare recoverable amount (higher of fair value less costs of disposal and value in use) to carrying value | Compare fair value of reporting unit to carrying amount |
| Qualitative screen | Not available | Optional qualitative assessment before quantitative test |
| Impairment reversal | Prohibited for goodwill | Prohibited for goodwill |
Bargain purchases (negative goodwill)
Both standards require a reassessment of all identified assets and liabilities before recognising a bargain purchase gain. Both recognise the gain immediately in profit or loss. The mechanics are substantially aligned.
Research and development acquired
| Aspect | IFRS 3 | ASC 805 |
|---|---|---|
| In-process R&D | Recognised as an intangible asset at fair value | Recognised as an intangible asset at fair value |
| Subsequent treatment | Accounted for under IAS 38 (capitalise development costs if criteria met; expense research) | Accounted for under ASC 730/ASC 350 (different rules for software vs other R&D) |
Comprehensive Comparison Table
Full comparison of key provisions
| Provision | IFRS 3 | ASC 805 |
|---|---|---|
| Issuing body | IASB | FASB |
| Jurisdiction | 140+ countries (UK, EU, Australia) | United States |
| Recognition test | Contractual-legal OR separable | Contractual-legal OR separable |
| Fair value framework | IFRS 13 | ASC 820 |
| Contingent consideration | Remeasured at FV through P&L | Equity-classified not remeasured |
| NCI measurement | Choice: full or proportionate | Full goodwill only |
| Goodwill impairment | One-step (IAS 36) at CGU level | One-step (ASC 350) at reporting unit |
| Qualitative impairment screen | Not available | Available (Step 0) |
| Measurement period | Up to 12 months | Up to 12 months |
| Bargain purchase | Gain in P&L after reassessment | Gain in P&L after reassessment |
| Acquired IPR&D | Intangible asset (IAS 38 rules) | Intangible asset (ASC 730/350 rules) |
IFRS 3 Distinctive Features
- NCI proportionate method available (lower goodwill)
- Contingent consideration always remeasured (more volatile P&L)
- No qualitative screen for goodwill impairment
- Impairment testing at CGU level (potentially smaller units)
ASC 805 Distinctive Features
- Full goodwill method required (higher goodwill balance)
- Equity-classified contingent consideration not remeasured
- Optional qualitative impairment screen (Step 0)
- Impairment testing at reporting unit level
Practical Implications for Cross-Border Deals
Scenario: UK company acquires US target
A UK-listed company reporting under IFRS acquires a US subsidiary. The PPA is performed under IFRS 3 for the group accounts. Key considerations:
- NCI measurement choice — the UK parent can elect the proportionate method, recognising less goodwill than US GAAP would require
- Contingent earn-out — must be remeasured each period under IFRS, creating P&L volatility that US GAAP might avoid with equity classification
- The US subsidiary may also need a PPA for local US GAAP statutory accounts under ASC 805 — potentially producing different intangible asset and goodwill balances
Scenario: US company acquires UK target
A US-listed company must apply ASC 805. The full goodwill method applies regardless of ownership percentage, and the qualitative impairment screen is available for ongoing testing.
In a 2025 cross-border acquisition, the difference in goodwill recognised under IFRS 3 (proportionate method) versus ASC 805 (full goodwill) was £12 million on a £180 million deal. This difference directly affected the annual impairment testing exposure and the acquirer's reported return on assets.
Emerging Developments
Both standard-setters are considering reforms:
- IASB Goodwill and Impairment project — considering enhanced disclosure requirements for business combinations and potentially reintroducing goodwill amortisation (shelved but may return)
- FASB ASU on goodwill — issued ASU 2017-04 simplifying the impairment test; ongoing consideration of amortisation for public and private companies
- Convergence outlook — further convergence appears unlikely in the near term as both boards focus on separate agendas
Decision Framework for Practitioners
1. Determine the reporting framework
The acquirer's reporting framework determines which standard applies. For dual-listed companies, both may apply to different reporting requirements.
2. Identify divergence points early
Map the key differences (contingent consideration, NCI, impairment) against the specific deal structure to understand where outcomes will differ.
3. Model both scenarios for cross-border deals
When both IFRS and US GAAP reporting are needed, run parallel PPA models and reconcile the differences for management and board communication.
4. Document the basis of preparation
Clearly state which standard was applied, which elections were made (NCI method under IFRS 3), and how contingent consideration was classified.
Conclusion
IFRS 3 and ASC 805 are more alike than different — the core recognition and fair value measurement framework is substantially converged. The meaningful differences lie in contingent consideration treatment, NCI measurement options, and goodwill impairment mechanics. Practitioners working on cross-border transactions must understand both standards and model the impact of divergence on reported goodwill and future P&L.
For the related comparison of ongoing intangible asset accounting, see IAS 38 vs ASC 350. For UK-specific considerations, explore FRS 102 vs IFRS. The Academy lesson on Accounting Standards provides the full educational context.
The Bottom Line
The standards are converged on fundamentals but diverge on details that can materially affect reported goodwill and earnings. For cross-border M&A, understanding these differences is not academic — it directly affects the acquirer's balance sheet, impairment exposure, and post-deal earnings profile.
Related Glossary Terms
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