A business can spend the same money, develop the same product and sign the same lease—and report different results under IFRS and US GAAP.
Those differences matter when a founder presents accounts to investors, a group consolidates an overseas subsidiary or a lender assesses financial performance.
The useful question is which accounting differences could change the decisions people make about your business. Four areas deserve particular attention: development costs, inventory, leases and impairment.
First, establish which reporting framework you need
IFRS Accounting Standards are issued by the International Accounting Standards Board. US GAAP for nongovernmental entities is principally contained in the FASB Accounting Standards Codification.
Your reporting basis depends on the applicable requirements and the purpose of the accounts. Local statutory reporting, group consolidation and investor reporting may require different information.
Do not assume that approaching US investors automatically requires a complete US GAAP conversion. The SEC’s Financial Reporting manual explains that qualifying foreign private issuers can file financial statements complying with IFRS as issued by the IASB without reconciling them to US GAAP. The relevant compliance statements and audit opinion matter.
Confirm the actual requirement before commissioning conversion work. This article compares full IFRS with US GAAP; it does not cover every local adaptation, private-company alternative or industry-specific rule.
1. Development costs: when spending becomes an asset
Under IAS 38, research expenditure is expensed. Development expenditure must be capitalised when the specified recognition conditions are met. Capitalisation records qualifying expenditure as an asset rather than immediately charging it all against profit.
The distinction requires evidence. Calling a project “development” in a budget does not establish that it qualifies. Document the relevant conditions, the date they were first satisfied and the costs incurred afterwards.
Under US GAAP, costs within ASC 730’s research-and-development scope are generally expensed as incurred. However, software and certain acquired assets have separate requirements. “US GAAP expenses every development cost” is an unsafe shortcut.
Software businesses should check the applicable guidance and adoption status. FASB’s issued ASU 2025-06 changes internal-use software accounting for annual periods beginning after 15 December 2027, with early adoption permitted. It should not automatically be treated as mandatory for 2026 accounts.
Worked example: the same project, different reported profit
Assume a fictional manufacturer develops a non-software product during 2026. Research expenditure is incurred before development begins. All subsequent development expenditure meets IAS 38’s conditions when incurred, while the expenditure falls within ASC 730 under US GAAP.
The asset becomes available for use on 1 October 2026. Its useful life is three years, with straight-line amortisation and no residual value or impairment.
Figures are whole US dollars. All project costs are paid during 2026. Tax effects, financing and other accounting differences are excluded; this is not a country-specific tax computation.
| Item | Calculation or basis | USD |
|---|---|---|
| Research expenditure | Assumed project cost | 60,000 |
| Qualifying development expenditure | Assumed project cost | 180,000 |
| Total project cash payments | 60,000 + 180,000 | 240,000 |
| Annual IFRS amortisation | 180,000 ÷ 3 years | 60,000 |
| IFRS amortisation for 2026 | 60,000 × 3/12 | 15,000 |
| IFRS asset at year-end | 180,000 − 15,000 | 165,000 |
Amortisation spreads the asset’s cost over its useful life. Here, it begins when the asset is available for use.
| Reporting item | IFRS: USD | US GAAP: USD |
|---|---|---|
| Profit before project costs and tax | 400,000 | 400,000 |
| Research expense | (60,000) | (60,000) |
| Development expenditure expensed immediately | — | (180,000) |
| Development asset amortisation | (15,000) | — |
| Profit before tax | 325,000 | 160,000 |
| Development asset at year-end | 165,000 | 0 |
| Total project cash payments | 240,000 | 240,000 |
The IFRS result includes a recognised asset and a smaller current-period expense. The project has not generated extra cash because of that accounting treatment.
For an investor comparison, explain the adjustment and the future amortisation attached to the asset. Comparing profit figures without that context can give a misleading impression of performance.
2. Inventory: the cost formula can change margins
IAS 2 permits FIFO or weighted-average costing for ordinarily interchangeable inventory and requires specific identification for appropriate non-interchangeable items. LIFO—last in, first out—is not permitted under IFRS. US GAAP permits LIFO.
FIFO assigns the earlier purchase costs to goods sold; LIFO assigns the later costs first. When purchase prices rise, those choices can produce different inventory values and gross margins.
An IFRS reporting group acquiring a US business using LIFO should assess the conversion adjustment before comparing operating results.
Also check subsequent measurement. IFRS generally uses the lower of cost and net realisable value. Under US GAAP, inventory using LIFO or the retail inventory method retains a different lower-of-cost-or-market model.
Ask for inventory policies, cost layers and valuation workings. A closing stock figure alone may not explain the difference.
3. Leases: balance-sheet recognition does not make the models identical
Both frameworks generally bring lessee lease assets and liabilities onto the balance sheet, subject to relevant exceptions.
IFRS 16 generally uses a single lessee model, with depreciation of the right-of-use asset and interest on the lease liability. US GAAP’s ASC 842 retains finance and operating lease classifications. An operating lease generally produces a single straight-line lease expense; a finance lease separates amortisation and interest.
For a lease treated as operating under US GAAP, IFRS reporting can therefore show a different expense pattern and different components within performance measures.
That can affect EBITDA comparisons, depending on the definition used. Review the lease schedules and the metric’s calculation together. Neither the accounting label nor a higher EBITDA figure changes the contractual rent payable.
4. Impairment: a recovery may be treated differently
For assets within IAS 36, IFRS compares carrying value with recoverable amount. Where the relevant conditions are met, an impairment loss on an asset other than goodwill is reversed, subject to a ceiling based on the carrying amount without the earlier impairment. Goodwill impairment is never reversed.
Under US GAAP, previously recognised impairment losses on long-lived assets held and used under ASC 360 cannot be reversed. This comparison should not be extended indiscriminately to inventory, financial instruments or assets held for sale, which have different guidance.
When reviewing a recovering business, examine its impairment history. An improvement in trading conditions may affect the two sets of accounts differently.
Build a reconciliation that supports decisions
For cross-border reporting, I would start with five checks:
- Confirm the reporting purpose. Establish what each regulator, parent company, lender or investor actually requires.
- Identify material differences. Prioritise the transactions capable of changing reported profit, assets or agreed financial measures.
- Collect supporting records. Retain project approvals, cost records, inventory layers, lease schedules and impairment workings.
- Separate recurring adjustments. Maintain opening balances, current-period movements and future expense effects for each material difference.
- Explain the commercial meaning. Show which changes reflect accounting requirements and which reflect changes in the business itself.
A useful IFRS-to-US-GAAP reconciliation connects each material adjustment to evidence and explains its effect over time. Start there before using reported margins or asset values to judge performance, agree lending terms or negotiate a transaction.
Patel Pratik & Co. can support businesses with financial-reporting reviews, cross-border reporting analysis and the assessment of material accounting differences.
