Key Takeaways
- A deferred tax liability arises when the carrying amount of an asset exceeds its tax base, or the carrying amount of a liability falls below its tax base.
- The liability is measured at the tax rate expected to apply when the temporary difference reverses, not the rate in effect at the reporting date.
- IAS 12.15 requires recognition of all taxable temporary differences, with limited exceptions for goodwill and initial recognition of assets and liabilities outside a business combination.
- Getting the deferred tax balance wrong can trigger both a misstated tax line and an incorrect effective tax rate reconciliation, which reviewers flag quickly.
What is Deferred Tax Liability?
On about half the mid-market IFRS engagements we've worked, the deferred tax liability is the single largest source of review notes. The team calculates the temporary difference correctly but uses the wrong tax rate or misapplies the initial recognition exception. The balance itself is straightforward once you see the mechanics. The audit risk is in the assumptions sitting behind it.
IAS 12.5 defines a taxable temporary difference as any difference between the carrying amount of an asset or liability and its tax base that will result in taxable amounts when the carrying amount is recovered or settled. An asset with a carrying amount of EUR 400,000 and a tax base of EUR 300,000 produces a taxable temporary difference of EUR 100,000. When the entity recovers the asset (through use or sale), EUR 100,000 of taxable income emerges that the entity has not yet paid tax on.
IAS 12.15 requires recognition of a deferred tax liability (DTL) for all taxable temporary differences, subject to the exceptions in IAS 12.15 (a)–(b). The DTL is measured at the rate expected to apply in the period of reversal ( IAS 12.47 ). If the government has enacted or substantively enacted a rate change, the entity uses the new rate even before it takes legal effect. The auditor's job under ISA 540.13 (a) is to evaluate whether management's assumptions about the reversal period and the applicable rate are appropriate. Deferred tax sits where accounting estimates meet tax law, so the audit team needs financial reporting knowledge and access to tax specialists on engagements where the balances are material.
Worked example: Hoffmann Maschinenbau GmbH
Client: German engineering company, FY2025, revenue EUR 28M, HGB reporter with IFRS conversion for group reporting purposes. Hoffmann purchased a CNC milling machine in January 2024 for EUR 600,000. For IFRS purposes, the machine is depreciated straight-line over five years (EUR 120,000 per year). For German tax purposes, the asset qualifies for declining-balance depreciation at 25% in year one and 25% of the remaining balance in year two.
Step 1 — Determine the carrying amount and tax base at 31 December 2025
After two years of IFRS depreciation, the carrying amount is EUR 360,000 (EUR 600,000 less two years at EUR 120,000). Tax depreciation in year one was EUR 150,000 (25% of EUR 600,000). Tax depreciation in year two was EUR 112,500 (25% of EUR 450,000). The tax base is EUR 337,500. The taxable temporary difference is EUR 22,500 (EUR 360,000 less EUR 337,500).
Documentation note: record the IFRS carrying amount, the tax base per the Steuerbilanz, the resulting temporary difference, and the asset category. Cross-reference to the fixed asset register and the tax depreciation schedule.
Step 2 — Identify the applicable tax rate
Germany's combined corporate tax rate (Korperschaftsteuer at 15%, solidarity surcharge at 5.5% of KSt, and Gewerbesteuer at approximately 14% depending on the municipality) produces an effective rate of roughly 30%. The Bundestag has not enacted any rate changes effective for 2026. Hoffmann uses 30%.
Documentation note: record the rate components, the municipal Gewerbesteuer multiplier, the basis for concluding no substantively enacted rate change exists per IAS 12.47 , and the source document (Federal Gazette or equivalent) for each rate input.
Step 3 — Measure the deferred tax liability
EUR 22,500 multiplied by 30% produces a deferred tax liability of EUR 6,750. This sits in the statement of financial position as a non-current item, presented net against any deferred tax asset arising from the same tax jurisdiction per IAS 12.74 .
Documentation note: record the measurement calculation, confirm netting applies (same taxable entity, same tax authority), reconcile the DTL movement to the income tax expense in the statement of profit or loss per IAS 12.79 , and cross-reference the rate to the legislative source.
Step 4 — Project the reversal
In years three through five, IFRS depreciation will continue at EUR 120,000 per year while tax depreciation declines. The temporary difference will reverse as the tax base catches up to (and eventually matches) the carrying amount at the end of year five, when both reach zero. The deferred tax liability unwinds through the tax line over that period.
Documentation note: include a five-year reversal schedule showing the temporary difference at each year-end and the corresponding deferred tax liability. This schedule is the primary evidence for ISA 540.18 when the reviewer evaluates the reasonableness of the projected reversal.
The DTL of EUR 6,750 is defensible because the temporary difference traces to the divergence between IFRS and tax depreciation methods, the rate is sourced from current enacted legislation, the reversal schedule shows when the liability will settle, and the netting treatment follows IAS 12.74 . That last point on the reversal schedule matters most at review. A reviewer who can open the file and see a five-year unwind schedule will sign off quickly. A reviewer who has to reconstruct the reversal from scratch will send it back.
Why it matters in practice
- Teams frequently calculate deferred tax using the current-year tax rate without checking whether a substantively enacted rate change applies to the reversal period. IAS 12.47 requires the rate expected to apply when the temporary difference reverses. A two-percentage-point rate change on a EUR 5M temporary difference shifts the DTL by EUR 100,000, which can exceed performance materiality (PM) on mid-market engagements. We've seen teams SALY the prior-year rate into a new schedule without a second glance, only to have the reviewer catch a rate change that was published months earlier.
- The initial recognition exception in IAS 12.15 (b) is often misapplied. It applies only to the initial recognition of an asset or liability in a transaction that is not a business combination and that, at the time of the transaction, affects neither accounting profit nor taxable profit. Teams sometimes extend this exception to subsequent measurement or to transactions that do affect profit, which understates the DTL.
- At firms like ours, the deferred tax working paper is the one most likely to come back from review with a full page of comments. It is genuinely frustrating. You think the logic is airtight, but the reviewer wants to see the rate sourced to a specific legislative reference, the reversal schedule tied line by line to the fixed asset register, the netting analysis cross-referenced to IAS 12.74 , and the year-on-year movement reconciled to the tax line. The file should tell a story from temporary difference to balance sheet line, and anything less gets bounced.
Deferred tax liability vs. deferred tax asset
| Dimension | Deferred tax liability | Deferred tax asset |
|---|---|---|
| Source | Taxable temporary differences: carrying amount exceeds tax base (assets) or tax base exceeds carrying amount (liabilities) | Deductible temporary differences, unused tax losses, unused tax credits |
| Recognition threshold | Recognised for all taxable temporary differences, with limited exceptions ( IAS 12.15 ) | Recognised only to the extent that it is probable that future taxable profit will be available ( IAS 12.24 ) |
| Judgement required | Low to moderate: mainly rate selection and reversal timing | High: requires a forecast of future taxable profits sufficient to absorb the deductible differences |
| Common audit risk | Understatement (temporary differences missed or exception incorrectly applied) | Overstatement (asset recognised without sufficient evidence of future profitability) |
| Balance sheet presentation | Non-current, netted against deferred tax assets from the same jurisdiction per IAS 12.74 | Non-current, netted against deferred tax liabilities from the same jurisdiction per IAS 12.74 |
The practical difference on an engagement is where the audit effort concentrates. A DTL is primarily a completeness question: have all taxable temporary differences been identified? A deferred tax asset is a valuation question: is there enough future taxable profit to use it? Mixing up the risk direction leads to testing the wrong assertion.
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Frequently asked questions
How do I audit a deferred tax liability on a large fixed asset base?
Obtain the entity's fixed asset register with both carrying amounts and tax bases by asset category. Recalculate the temporary differences for the largest categories and apply the expected reversal rates. ISA 540.18 requires the auditor to evaluate whether the assumptions (depreciation methods, useful lives, tax rates) produce a reasonable estimate. For entities with hundreds of assets, testing the methodology on the top 10 categories by value usually covers the majority of the balance.
Can a deferred tax liability be offset against a deferred tax asset?
Yes, but only when the entity has a legally enforceable right to set off current tax assets against current tax liabilities and the deferred amounts relate to income taxes levied by the same authority on the same taxable entity. IAS 12.74 sets out these conditions. If the deferred tax asset arises in a different jurisdiction or a different group entity, netting is not permitted.
Does a deferred tax liability affect the effective tax rate reconciliation?
Yes. The movement in the deferred tax balance forms part of total income tax expense under IAS 12.79. An increase in the deferred tax liability raises tax expense without a corresponding cash outflow. The effective tax rate reconciliation (IAS 12.81) must explain why the effective rate differs from the statutory rate, and temporary difference movements are one of the primary reconciling items.