Deferred Tax Calculator
Ireland

IAS 12 deferred tax in Ireland: IAS 12 as adopted by the EU for IFRS reporters; FRS 102 Section 29 for entities applying Irish/UK GAAP

Ireland's 12.5% corporation tax rate on trading income is one of the lowest in Europe and is the primary reason many multinational groups locate holding companies, IP structures, and operational entities in Ireland. The 12.5% rate applies to trading income; passive income (investment income, rental income, certain foreign income) is taxed at 25%. Capital gains are taxed at 33%. For deferred tax, IAS 12.47 requires measurement at the rate expected to apply when the temporary difference reverses. This means Irish entities must split their temporary differences into three categories: those reversing through trading income (12.5%), those reversing through passive income (25%), and those reversing through capital gains (33%). The rate classification makes Irish deferred tax calculations more complex than those in single-rate jurisdictions. Ireland adopted IFRS as endorsed by the EU, and all entities listed on Euronext Dublin apply IAS 12. Private entities can choose FRS 102 Section 29, which uses a timing difference approach. The transition from the timing difference model (FRS 102) to the temporary difference model (IAS 12) creates differences in the deferred tax population, particularly for revaluations and business combinations. Pillar Two (the OECD/G20 global minimum tax) is particularly significant for Ireland because many multinational groups have Irish entities with effective tax rates below 15%. Ireland transposed the EU Minimum Tax Directive through Finance Act 2023, effective for accounting periods beginning on or after 31 December 2023.

Regulatory context: Irish Auditing and Accounting Supervisory Authority (IAASA); Revenue Commissioners for tax administration

IAASA (the Irish Auditing and Accounting Supervisory Authority) reviews the financial statements of Irish entities whose securities are admitted to trading on a regulated market. IAASA's 2023 observations on selected accounting topics included deferred tax, with specific findings on: the failure to apply different rates to different categories of temporary differences (entities applying 12.5% to all items, including those that should use 25% or 33%), inadequate disclosure of the key judgements in the deferred tax asset recoverability assessment, and insufficient detail in the effective tax rate reconciliation. IAASA has been particularly focused on Pillar Two disclosures since 2023. IAASA expects entities within scope to disclose their exposure, including the jurisdictions where the effective tax rate is below 15%, the expected impact of the top-up tax, and the application of the IAS 12.4A exception for deferred tax arising from Pillar Two. For Irish entities, the most affected are those in multinational groups where the Irish operations benefit from the 12.5% rate and may now face a top-up to 15%.

Practical guidance for Ireland

Irish practitioners must determine the correct rate for each temporary difference. Fixed assets used in trading activities generate temporary differences that reverse at 12.5% (through capital allowances against trading income). Investment properties generate temporary differences that may reverse at 25% (rental income) or 33% (capital gains on disposal). The IAS 12.51C sale presumption is particularly relevant for Irish investment property: if the entity expects to sell, the rate is 33% (capital gains); if the entity expects to hold and earn rental income, the rate is 25% (passive income). Share-based payments create temporary differences where the tax deduction may be claimed against trading income (12.5%) if the payments relate to employees engaged in trading activities. Capital allowances in Ireland follow a straight-line pattern for most assets: plant and machinery receive 12.5% per annum over 8 years, industrial buildings receive 4% per annum over 25 years. These rates often differ from the accounting depreciation, creating temporary differences. Intangible assets qualifying under Section 291A TCA 1997 receive capital allowances at the accounting depreciation rate (up to 80% of cost) or over 15 years, providing a closer match to the IFRS amortisation but still creating temporary differences where the tax and accounting useful lives differ. The Knowledge Development Box (KDB) provides an effective rate of 6.25% on qualifying IP income (10% deduction on qualifying profits). For entities with temporary differences that will reverse through KDB-qualifying income, measure deferred tax at 6.25%. This creates a fourth rate category for Irish deferred tax computations.

Audit expectations

IAASA inspection findings on deferred tax in Ireland emphasise the rate classification issue. Auditors should verify that each material temporary difference is classified to the correct income category (trading, passive, capital gains, KDB) and that the corresponding rate is applied. IAASA has found that auditors accept a blanket 12.5% rate without considering whether specific items (investment property gains, rental income, intercompany interest) should use 25% or 33%. Auditors should also test the Pillar Two exposure calculation for groups where the Irish entity's effective rate is below 15% after considering the top-up.

Ireland-specific considerations

Pillar Two is the defining issue for Irish deferred tax for the foreseeable future. Ireland's 12.5% trading rate is below the 15% minimum, meaning many Irish entities in qualifying groups will face a top-up tax. The IAS 12.4A exception means entities don't recognise deferred tax on the top-up tax itself, but they must disclose the exposure. The practical question is whether the top-up tax changes the rate at which existing temporary differences should be measured. Under IAS 12.47, the rate should reflect the expected rate when the difference reverses. If the entity expects to pay a 15% effective rate (12.5% plus a 2.5% top-up), should deferred tax be measured at 15%? The IAS 12.4A exception suggests not (it's a temporary exception from recognising deferred tax arising from Pillar Two). Existing temporary differences continue to be measured at 12.5%, and the top-up tax is recognised as current tax only. Ireland's group relief rules allow trading losses to be surrendered between group companies (Section 420 TCA 1997). This affects the recoverability of deferred tax assets on losses: if a profitable group company can accept the losses, the deferred tax asset is recoverable even if the loss-making entity itself has no future taxable profits. The assessment should consider the group structure and whether group relief is available. The Section 110 securitisation vehicle regime provides a tax-efficient structure for Irish SPVs holding qualifying assets. These vehicles are taxed on a minimal margin (the profit after interest and expenses), and deferred tax is usually immaterial. However, if the vehicle holds assets with temporary differences (such as IFRS 9 ECL provisions on loan portfolios), the deferred tax should be calculated on the vehicle's applicable rate.

Common inspection findings

IAASA found entities applying the 12.5% trading rate to temporary differences on investment properties, which should use the 25% passive rate or 33% capital gains rate depending on the recovery assumption.

Deferred tax assets on trading losses were recognised without assessing whether the losses would expire or whether the entity had sufficient future trading (not passive) income to absorb them.

The Pillar Two exposure disclosure was missing or generic, without identifying the specific jurisdictions affected or the expected magnitude of the top-up tax.

Auditors did not verify the entity's KDB claim or test whether the 6.25% rate was correctly applied only to qualifying temporary differences.

The tax rate reconciliation failed to separately identify the effect of income taxed at different rates (12.5%, 25%, 33%), making it impossible for users to understand the effective rate composition.