The main differences between IFRS and GAAP depreciation come down to five things: IFRS lets you revalue property, plant, and equipment upward while US GAAP locks assets at historical cost; IFRS requires you to depreciate significant components of an asset separately while US GAAP only permits it; IFRS forces an annual review of useful life and residual value while US GAAP waits for a triggering event; IFRS allows previously recognized impairment losses to be reversed while US GAAP prohibits reversal; and IFRS has a dedicated fair-value regime for investment property that has no US GAAP equivalent. Each of these can change the depreciation base, the annual expense, or both, which is why a multinational running books under both frameworks usually ends up with two fixed-asset ledgers rather than one.
The Depreciation Base: Cost Model or Revaluation
US GAAP requires the cost model for PP&E. Under ASC 360, assets stay on the books at historical cost minus accumulated depreciation and any impairment losses. Writing up the value of PP&E is never permitted, so the depreciation base is fixed to what you originally paid.
IFRS gives a choice. IAS 16 allows either the cost model or the revaluation model, and the election applies to an entire class of assets. You cannot revalue a single building while leaving the rest of your real estate at cost.1IFRS Foundation. International Accounting Standard 16 – Property, Plant and Equipment
Under the revaluation model, an asset is carried at fair value on the revaluation date, minus any subsequent depreciation and impairment. Revaluations must be performed regularly enough that the carrying amount stays close to fair value. Upward revaluations go to other comprehensive income and accumulate in equity as a revaluation surplus. Decreases hit profit or loss unless they reverse a previous surplus.
The practical effect is direct. An IFRS company using the revaluation model may depreciate a significantly higher base than a US GAAP counterpart holding an identical asset. A factory purchased for $10 million and revalued to $15 million produces a higher annual depreciation charge going forward, which reduces reported profit even though no cash moved.
Revaluing upward also opens a deferred tax question. The carrying amount on the financial statements now sits above the tax base, which typically stays at historical cost. That temporary difference under IAS 12 requires a deferred tax liability, and where the revaluation gain is in other comprehensive income, the related deferred tax follows it into OCI rather than profit or loss.2IFRS Foundation. IAS 12 Income Taxes US GAAP has no equivalent complication because there is no revaluation.
Component Depreciation
IAS 16 requires companies to break an asset into its significant parts when those parts have different useful lives or different patterns of use, and depreciate each part separately. Aircraft engines, for example, must be depreciated on a different schedule than the airframe, because engines are overhauled or replaced well before the airframe reaches the end of its useful life. Even the residual cost that cannot be attributed to a specific significant part is depreciated on its own.1IFRS Foundation. International Accounting Standard 16 – Property, Plant and Equipment
When a component is replaced, IFRS requires the old part’s carrying amount to be removed from the books and the new part’s cost to be capitalized. That derecognition step keeps the balance sheet from carrying costs for parts that no longer exist in the asset.
US GAAP permits component depreciation but does not require it, and in practice very few companies bother. Most treat the asset as a single depreciable unit with one blended useful life. Simpler to administer, less precise. For dual reporters, this difference often forces a second fixed-asset ledger with component-level detail on the IFRS side.
Annual Review of Useful Life and Residual Value
IFRS requires companies to revisit both residual value and useful life at least once a year, at every financial year-end. If current expectations differ from previous estimates, the change flows through prospectively as a change in accounting estimate under IAS 8.1IFRS Foundation. International Accounting Standard 16 – Property, Plant and Equipment
US GAAP has no comparable annual mandate. Reviews are generally triggered only when events or changed circumstances suggest existing estimates may be off. In practice, a US GAAP company might run with the same useful life and salvage value for a decade without formal reassessment, while an IFRS reporter must document its conclusion every year, even when nothing has changed.
The annual review matters because it keeps depreciation expense aligned with reality. A machine originally expected to last ten years that now looks like seven gets a higher annual depreciation charge going forward. Under IFRS, that adjustment happens the first year the expectation shifts. Under US GAAP, it may not happen until an auditor or internal event forces the question.
Depreciation Methods and Method Changes
Both frameworks allow the same common methods: straight-line, declining balance, and units of production. Both also prohibit revenue-based depreciation for PP&E. IAS 16 states the prohibition explicitly, reasoning that revenue reflects factors like pricing and sales volume that have nothing to do with how an asset is physically consumed.1IFRS Foundation. International Accounting Standard 16 – Property, Plant and Equipment
Where the frameworks differ in tone is in how they frame the choice. IFRS is principle-based: the method should reflect the pattern in which the asset’s future economic benefits are expected to be consumed. US GAAP requires the method to be systematic and rational but is less prescriptive about the conceptual justification.
Changes in method end up in similar places by different reasoning. Under IFRS, a change in depreciation method is a change in accounting estimate, applied prospectively. Comparatives are not restated.3IFRS Foundation. IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors US GAAP reaches the same result. ASC 250-10-45-18 classifies a change in depreciation method as a change in accounting estimate effected by a change in accounting principle, and because the estimate component is inseparable from the principle component, it is treated as a change in estimate and applied prospectively. The one extra hurdle under US GAAP is that the company must demonstrate the new method is preferable. Neither framework requires restating prior periods.
Impairment and Reversal
Impairment resets the depreciation base, so it matters for depreciation even when you are not looking at it directly. The two frameworks differ in both the test and in whether a write-down can later be undone.
The Test
US GAAP uses a two-step approach under ASC 360. First, compare the asset group’s carrying amount to the undiscounted future cash flows expected from its use and eventual disposal. If the carrying amount is lower, the asset passes and no impairment is recorded. Only if the asset fails this screen does the company proceed to step two, measuring the loss as the difference between carrying amount and fair value. Undiscounted cash flows create a higher bar for recognition.
IFRS runs one step under IAS 36. Compare the carrying amount to the recoverable amount, which is the higher of fair value less costs of disposal and value in use. Value in use uses discounted cash flows, so the IFRS test is more sensitive to impairment than the US GAAP screen.4IFRS Foundation. IAS 36 Impairment of Assets
Reversal
This is where the gap is widest. US GAAP flatly prohibits reversing an impairment loss on a long-lived asset held for use. Once written down, the new lower carrying amount becomes the asset’s cost basis going forward, and depreciation continues from there even if conditions improve dramatically.
IFRS allows reversal on PP&E when there has been a genuine change in the estimates used to determine recoverable amount, such as improved market conditions or better-than-expected asset performance. The reversal cannot exceed the carrying amount the asset would have had if the impairment had never been recognized, after normal depreciation. Goodwill impairment can never be reversed under either framework. The mere passage of time is not sufficient grounds for reversal; something about the underlying economics has to have changed.
The effect on reported earnings can be substantial. An IFRS company that wrote down a factory during a downturn and later reverses during recovery shows a gain that boosts income and a higher depreciation base going forward. A US GAAP company in the same situation reports neither.
Investment Property
IAS 40 creates a depreciation treatment with no US GAAP equivalent. Under the fair value model, investment property is remeasured to fair value at the end of each reporting period, changes in fair value go straight to profit or loss, and the property is not depreciated at all.5IFRS Foundation. IAS 40 Investment Property
US GAAP has no separate concept of investment property. Real estate held for rental income or capital appreciation is accounted for as ordinary PP&E under ASC 360, which means it is depreciated over its useful life using the cost model. The only exception involves investment companies qualifying under ASC 946, which use specialized fair-value accounting.
For real-estate-heavy companies, the choice between IAS 40’s fair value model and its cost model can move reported income by millions. Electing the fair value model removes depreciation expense from investment properties entirely, at the cost of fair-value volatility hitting the income statement every period.
Right-of-Use Assets Under the Lease Standards
Lease accounting produces another divergence. IFRS 16 uses a single lessee model: virtually all leases generate a right-of-use asset and a lease liability, and the right-of-use asset is depreciated on a pattern consistent with a finance lease. Depreciation on the asset and interest on the liability are recognized separately, which front-loads total expense because interest is higher in early periods.
ASC 842 keeps the operating-versus-finance distinction. Finance leases follow the same depreciation-plus-interest pattern as IFRS 16. Operating leases recognize a single straight-line lease expense over the term, even though a right-of-use asset appears on the balance sheet. That right-of-use asset is not depreciated in the traditional sense; it functions as a plug figure to produce the straight-line expense.
The result is that two identical lease arrangements can produce different expense timing on the income statement depending on the framework. An IFRS lessee typically shows higher total expense in the early years and lower later. A US GAAP lessee with an operating lease shows level expense throughout.
Tax Depreciation Sits Outside Both Frameworks
Neither IFRS nor US GAAP governs how depreciation works for tax purposes, but the gap between book and tax depreciation drives deferred tax accounting under both.
In the United States, the IRS requires the Modified Accelerated Cost Recovery System for most tangible property. MACRS assigns fixed recovery periods that often differ from book useful lives. Commercial buildings are depreciated over 39 years, residential rental property over 27.5 years, and equipment over 5 or 7 years using accelerated declining-balance methods. These schedules typically front-load tax deductions relative to book depreciation, creating temporary differences and deferred tax liabilities. Companies changing their tax depreciation method for any asset must file IRS Form 3115, which applies to changes in the overall method or in the treatment of any specific item.6Internal Revenue Service. About Form 3115, Application for Change in Accounting Method
IFRS reporters in other jurisdictions run into the same dynamic with local tax rules, though the specifics vary by country. For a multinational, the real administrative burden lives in maintaining separate schedules for financial reporting under two standards and for tax in multiple jurisdictions. Three or more parallel fixed-asset registers for the same equipment is common.
Disclosure Requirements
IFRS requires detailed disclosures about depreciation policies. Companies must disclose the measurement basis for gross carrying amounts, the depreciation methods applied, and the useful lives or rates for each class of PP&E. A full reconciliation of carrying amounts at the beginning and end of the period is mandatory, showing additions, disposals, impairment losses, reversals, and depreciation expense. Revaluation-model users add disclosures on the effective date of the most recent revaluation, whether an independent valuer was involved, and movements in the revaluation surplus.1IFRS Foundation. International Accounting Standard 16 – Property, Plant and Equipment
US GAAP disclosures are less granular. Companies must identify major classes of depreciable assets, the methods used, and total depreciation expense for the period. The reconciliation requirement is not as detailed. For dual reporters, the IFRS disclosure package drives the workload. Preparing the IFRS reconciliation with component-level detail and revaluation disclosures takes materially more effort than meeting the US GAAP requirements, and most dual reporters build their processes around the more demanding IFRS standard and extract US GAAP disclosures from the same data.