IAS 12 vs ASC 740: income tax differences

Deferred tax is technical under either framework, and the differences between IAS 12 and ASC 740 trip up groups that report in both. This guide sets out each difference, shows how the deferred tax asset test works in each, and explains the uncertain tax position rules side by side.

By Hamza Fida, Chartered Accountant. Reviewed by Mirza Fahad Baig, Chartered Accountant. Checked against official sources on . 3 minute read.

Short answer

IAS 12 vs ASC 740 share the same balance sheet approach to deferred tax but differ in several mechanics. US GAAP recognises all deferred tax assets and then reduces them with a valuation allowance; IFRS recognises them only to the extent recovery is probable. Uncertain tax positions follow a two-step recognition and measurement test under US GAAP and IFRIC 23 under IFRS. The frameworks also differ on tax rates, intragroup transfers, the initial recognition exemption and where tax effects are presented.

At a glance

Approach
Balance sheet, both
Deferred tax assets
Probable (IFRS) vs valuation allowance (US)
Uncertain positions
IFRIC 23 vs two-step test
Tax rates
Substantively enacted vs enacted
Initial recognition exemption
IFRS only
Balance sheet classification
Non-current, both
IAS 12 vs ASC 740: income tax differencesApproach: Balance sheet, both; Deferred tax assets: Probable (IFRS) vs valuation allowance (US); Uncertain positions: IFRIC 23 vs two-step test; Tax rates: Substantively enacted vs enacted; Initial recognition exemption: IFRS only; Balance sheet classification: Non-current, both.KEY FACTS AT A GLANCEIAS 12 vs ASC 740: income tax differencesApproachBalance sheet, bothDeferred tax assetsProbable (IFRS) vsvaluation allowance (US)Uncertain positionsIFRIC 23 vs two-step testTax ratesSubstantively enacted vsenactedInitial recognition exemptionIFRS onlyBalance sheet classificationNon-current, bothChecked against official sourcesTax BakersIAS 12 vs ASC 740: income tax differencesApproach: Balance sheet, both; Deferred tax assets: Probable (IFRS) vs valuation allowance (US); Uncertain positions: IFRIC 23 vs two-step test; Tax rates: Substantively enacted vs enacted; Initial recognition exemption: IFRS only; Balance sheet classification: Non-current, both.KEY FACTS AT A GLANCEIAS 12 vs ASC 740: income taxdifferencesApproachBalance sheet, bothDeferred tax assetsProbable (IFRS) vs valuation allowance (US)Uncertain positionsIFRIC 23 vs two-step testTax ratesSubstantively enacted vs enactedInitial recognition exemptionIFRS onlyBalance sheet classificationNon-current, bothChecked against official sourcesTax Bakers
Key facts at a glance, as set out in this guide.

IAS 12 vs ASC 740: what are the differences?

IAS 12 vs ASC 740 at a glanceIAS 12 vs ASC 740 at a glanceTOPICIFRSUS GAAPValuation allowanceNot usedRequiredSubstantively enacted ratesAllowedNot allowedInitial recognition exemptionAllowedNot allowedBackwards tracingRequiredNot allowedDeferred tax classificationNon-currentNon-current
Same balance sheet approach; different recognition mechanics.
AreaIAS 12ASC 740
Deferred tax assetsRecognised to the extent it is probable that taxable profit will be availableRecognised in full, then reduced by a valuation allowance if it is more likely than not that some will not be realised
Tax ratesEnacted or substantively enactedEnacted only
Uncertain tax positionsIFRIC 23: reflect uncertainty if acceptance by the tax authority is not probable, using the most likely amount or expected valueTwo steps: recognise only if more likely than not to be sustained; measure at the largest amount more than 50% likely to be realised
Initial recognition exemptionNo deferred tax on initial recognition of certain assets and liabilities outside a business combination, unless equal taxable and deductible differences ariseNo such exemption
Intragroup transfer of assetsDeferred tax at the buyer's rate on the new tax baseRecognised for transfers other than inventory; inventory transfers deferred until sold outside the group
Tax on items in equity or OCIFollows the item, including later changes (backwards tracing)Later changes generally go to profit or loss
Rate reconciliationRequired, format flexibleSpecified categories and thresholds for public companies under ASU 2023-09

An example: a deferred tax asset on tax losses

A company has tax losses of 400 carried forward and a 25% tax rate, so a potential deferred tax asset of 100. It expects taxable profits to use only half the losses.

IAS 12ASC 740
Gross deferred tax assetNot recognised separately100
Valuation allowanceNot used(50)
Deferred tax asset on the balance sheet5050

The net answer is often the same, but US disclosures show the gross asset and the allowance separately. The thresholds also differ in wording: "probable" under IFRS and "more likely than not" under US GAAP, which in practice are usually applied similarly for this purpose.

How do uncertain tax positions compare?

Suppose a company claims a deduction worth 100 and estimates a 60% chance it will be fully upheld and a 40% chance it will be disallowed.

  • ASC 740: the position is more likely than not to be sustained, so it is recognised, measured at the largest amount more than 50% likely to be realised: 100 here, since full acceptance has a 60% chance.
  • IFRIC 23: if acceptance is probable, the deduction is reflected as filed. Where it is not, the company uses whichever of the most likely amount or the expected value better predicts the outcome; for a single all-or-nothing issue, the most likely amount usually does.

With more possible outcomes, the two methods can give different numbers.

Why does the initial recognition exemption matter?

Under IFRS, buying an asset whose tax base differs from its cost, outside a business combination and without affecting accounting or taxable profit, creates no deferred tax. A 2021 amendment removed the exemption for transactions such as leases that create equal and offsetting temporary differences, so deferred tax is now recognised on them. US GAAP has no exemption and uses a simultaneous equations method for such assets.

How do they treat the global minimum tax?

Both recognise Pillar Two top-up tax as current tax and do not adjust deferred taxes for it: IFRS through a mandatory temporary exception in IAS 12, US GAAP by treating it like an alternative minimum tax. See Pillar Two and IAS 12.

Where to go next

See IFRS vs US GAAP: the key differences and the journal entry for deferred tax.

Need help applying the standards?

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Questions people ask

What is the difference between IAS 12 and ASC 740?

Both use the balance sheet approach. Differences include valuation allowances, tax rates, uncertain tax positions, the initial recognition exemption, intragroup transfers and backwards tracing.

Does IFRS use a valuation allowance for deferred tax assets?

No. IFRS recognises deferred tax assets only to the extent recovery is probable; US GAAP recognises them in full and deducts a valuation allowance.

How are uncertain tax positions treated under IFRS and US GAAP?

US GAAP uses a two-step more-likely-than-not test and cumulative probability measurement; IFRS uses IFRIC 23, with the most likely amount or expected value.

Which tax rate is used for deferred tax?

Enacted or substantively enacted rates under IFRS; enacted rates only under US GAAP.

Sources

Every fee, date and rule on this page was taken from these official and primary sources.

  1. IFRS Foundation: IFRS Accounting Standards
  2. FASB Accounting Standards Codification

Rules and fees change. If you are reading this long after October 4, 2026, confirm the figures with the source before you rely on them.

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This guide is general information. It is not tax or legal advice for your situation.