IFRS vs US GAAP: key differences for Swiss businesses

Why “principles vs rules” is not enough

IFRS Accounting Standards are issued by the IASB. US GAAP for nongovernmental entities are organised in the FASB Accounting Standards Codification. Both frameworks aim to provide useful financial information, but their requirements are not interchangeable.

IFRS are often described as principles-based and US GAAP as rules-based. That shorthand does not resolve an accounting question. Both contain detailed requirements, exceptions and areas that require judgement. A company cannot choose a preferred result simply by invoking IFRS flexibility.

Before comparing, establish the entity type, reporting period and policies or alternatives available. Some US GAAP alternatives apply to eligible private companies and cannot be carried across to every listed company or group reporting package.

A Swiss subsidiary also needs a clear relationship between group reporting and its local statutory accounts. An IFRS or US GAAP consolidation package does not automatically replace Swiss legal or tax obligations. Our guide to IFRS and IAS explains the distinction between these deliverables.

The main differences at a glance

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This table identifies review areas. It does not mean that every transaction in a row produces an adjustment. Begin with the policies actually applied and the company’s contracts, rather than a theoretical list of all possible differences.

Inventory: a worked FIFO and LIFO example

LIFO means last in, first out; FIFO means first in, first out. These are cost-allocation methods, not instructions about which physical item leaves the warehouse first. Under IAS 2, LIFO is not allowed. US GAAP permits it within the applicable rules.

Assume a company buys 100 units for CHF 10 each and then 100 units for CHF 14 each. It subsequently sells 120 units for CHF 20 each. There are no other costs or inventory movements in this simplified example.

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Under FIFO, cost of sales comprises the first 100 units at CHF 10 and another 20 at CHF 14. Under LIFO, it comprises the latest 100 units at CHF 14 and another 20 at CHF 10. The difference in gross profit and closing inventory is CHF 320.

The underlying purchases and sales are identical. The accounting allocation changes; it does not create additional cash. In a real reconciliation, valuation write-downs and the rules for any reversal also require separate analysis.

US GAAP does not require every company to use LIFO. If both entities apply compatible FIFO policies, this particular difference may not arise.

Leases: balance-sheet recognition in both frameworks

IFRS 16 and ASC 842 generally require a lessee to recognise a right-of-use asset and a lease liability for leases within their scope, subject to the applicable exemptions. Saying that US GAAP operating leases always remain off the balance sheet is therefore incorrect.

A significant difference is the expense model. IFRS 16 generally separates depreciation of the right-of-use asset from interest on the liability. ASC 842 distinguishes finance leases from operating leases; its operating lease model generally presents a single lease expense.

The resulting pattern and classification can affect comparisons of operating profit, EBITDA and cash-flow categories. EBITDA also needs its own clear definition: a change in reported EBITDA does not by itself establish that the business generates more cash.

Review lease exemptions separately. The IFRS exemption for low-value underlying assets does not automatically apply under US GAAP. Also check lease term, options, modifications and discount-rate requirements using the same underlying contract data.

Revenue: a shared model with remaining differences

IFRS 15 and ASC 606 emerged from a joint standard-setting project. Both use a five-step approach: identify the contract, identify performance obligations, determine the transaction price, allocate that price and recognise revenue as the obligations are satisfied.

There are still differences in detailed requirements and application. Licensing arrangements, variable consideration, options and the nature of the promised goods or services may require careful analysis. Similar terminology is not sufficient evidence that the accounting will be identical.

One misleading shortcut is that software licence revenue is always recognised over time under IFRS and immediately under US GAAP. The answer depends on the rights granted, associated services and contractual facts under each framework.

Compare the same contract in a schedule showing each performance obligation, the allocated price, recognition timing and the supporting accounting analysis. That makes a real difference visible and also documents cases where the result is the same.

Our guide to revenue and turnover explains why revenue, invoicing and cash collection are distinct concepts.

Fixed assets, development and software

IAS 16 permits the cost model or the revaluation model for a class of property, plant and equipment when its conditions are met. US GAAP generally does not permit discretionary upward revaluation of tangible fixed assets held and used. An IFRS revaluation is not simply a choice to update any asset whenever management prefers a higher value.

Separate tangible assets from intangible assets. IAS 16 does not govern brands or software directly; IAS 38 and other relevant requirements may apply. Development expenditure must be assessed against the applicable recognition criteria rather than treated as automatically capitalisable.

For US GAAP software accounting, distinguish internal-use software from software intended for sale or marketing. These do not necessarily follow the same model. FASB’s 2025 amendments to internal-use software accounting also make the applicable version and adoption status important to check.

Useful lives, significant components, impairment and subsequent expenditure can create further issues. Prioritise material balances and retain the calculations supporting both the original treatment and the proposed reporting adjustment.

Build a reconciliation management can use

Start with the source framework, target framework and reporting period. Identify material transactions, confirm the applicable policies and calculate the differences. The purpose is a traceable bridge between reported figures, not an unsupported replacement of one total with another.

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Explain whether a difference changes measurement, timing or presentation. An adjustment may increase this year’s profit and reduce a later year’s profit. It may also affect profit without changing cash. Management needs those distinctions before interpreting a reporting movement as improved commercial performance.

Agree ownership of recurring entries and the information needed at the next close. Reconcile the final package back to the source accounts and retain a clear audit trail for every material adjustment.

Frequently asked questions