A deferred tax asset (DTA) is only worth booking if the entity will earn enough future taxable profit to actually use it. IAS 12 and US GAAP both test that recoverability, but they arrive at the balance-sheet number by opposite mechanical routes — and understanding the difference is what stops a group reporting under both frameworks from double-counting or mislabelling one of the largest judgemental estimates in the accounts. This guide walks through the recognition test, the sources of future taxable profit, how positive and negative evidence is weighed, the journals under each framework, the auditor's red flags, disclosure, and a real filed example.
Recognition Test vs Valuation Allowance: What Actually Differs?
The frameworks reach a similar net asset but present it in opposite ways. IAS 12 recognises a deferred tax asset only to the extent that it is probable future taxable profit will be available against which the deductible temporary difference or loss can be utilised (IAS 12.24 for deductible temporary differences; IAS 12.34 for unused tax losses and credits). There is no separate contra account: the balance sheet carries the net recoverable amount directly, and any unrecoverable portion is simply never recognised.
US GAAP takes the reverse path. Under ASC 740-10-30-5 an entity first recognises the full gross deferred tax asset for every deductible temporary difference and carryforward, then records a separate valuation allowance to reduce that gross asset to the amount that is "more likely than not" (a threshold explicitly greater than 50%) to be realised. The gross DTA and the allowance are disclosed separately even though only the net reaches the reader's mental model of the balance sheet.
The probability bar is close in substance. "More likely than not" under ASC 740-10-30-5 is an express greater-than-50% test; IAS 12 does not put a number on "probable", but in practice preparers and auditors read it as more likely than not too. The genuine differences are (1) presentation — one net line versus gross-plus-allowance — and (2) the direction of the test, which changes what the auditor asks to see. Because IAS 12 recognises only the recoverable portion, IAS 12.82 requires specific disclosure and evidence when a DTA is recognised in an entity that has suffered a loss in the current or preceding period.
Where Does the Future Taxable Profit Come From?
Both frameworks require the future taxable profit to come from an identifiable source, not merely from optimism. IAS 12.28-.29 and ASC 740-10-30-18 list near-identical sources, and the recoverability memo should map each DTA to one of them.
The Four Sources
ASC 740-10-30-18 sets out four sources of taxable income, in the order an entity should look to them: (a) future reversals of existing taxable temporary differences; (b) future taxable income exclusive of reversing temporary differences and carryforwards; (c) taxable income in prior carryback years if carryback is permitted; and (d) tax-planning strategies. IAS 12.28 mirrors (a) by allowing a DTA where sufficient taxable temporary differences relating to the same taxation authority reverse in the same period, while IAS 12.29 covers the equivalent of (b) and (d) — probable future taxable profit and tax-planning opportunities. Reversing taxable temporary differences (source (a)) are the strongest evidence because they are already on the balance sheet and do not depend on forecasts.
Tax-Planning Strategies
A tax-planning strategy is a prudent and feasible action management would actually take to prevent a loss or credit expiring unused (ASC 740-10-30-19; IAS 12.30). The strategy must be prudent, feasible, and one management would implement — for example, selling an appreciated asset with a built-in gain, electing to switch from tax-exempt to taxable investments, or accelerating a group reorganisation. It cannot be a hypothetical the entity would never really pursue. Where a strategy would carry significant expense, ASC 740-10-30-19 requires that net-of-expense benefit to be reflected in sizing the allowance, and the strategy must be disclosed under ASC 740-10-50-8.
How Do You Weigh Positive Against Negative Evidence?
All available evidence, both positive and negative, must be weighed, and objective verifiable evidence carries more weight than subjective forecasts. ASC 740-10-30-23 states plainly that the weight given to potential evidence should be commensurate with the extent to which it can be objectively verified, and that forecasts of future income are inherently more subjective than, say, existing contracts or reversing temporary differences. IAS 12.35-.36 applies the same logic to unused tax losses: their existence is "strong evidence" that future taxable profit may not be available, so a DTA on losses is recognised only to the extent of convincing other evidence.
The Cumulative Loss Position
A cumulative loss in recent years is the single piece of negative evidence that is hardest to overcome. ASC 740-10-30-21 to -30-23 treat a cumulative pre-tax loss over the current and two preceding years as significant negative evidence that is objective and difficult to outweigh; in practice, once an entity is in a three-year cumulative loss position, a full valuation allowance is the default, rebuttable only by strong, verifiable positive evidence such as firm backlog or reversing taxable temporary differences. IAS 12.35 is the direct analogue: where an entity has a history of recent losses, it recognises a DTA on unused losses only to the extent it has sufficient taxable temporary differences or other convincing evidence. This is why forecasts alone rarely support recognition in a loss-making entity — the auditor will discount them precisely because they are the least verifiable evidence facing the most objective negative indicator.
Evidence Weighting Table
| Evidence | Direction | Objectivity / weight |
|---|---|---|
| Reversing taxable temporary differences (same authority, same period) | Positive | High — already recognised, not forecast-dependent |
| Firm sales backlog / contracted revenue | Positive | High — externally verifiable |
| Strong recent earnings history | Positive | Medium-high — objective but backward-looking |
| Management profit forecasts beyond contracted work | Positive | Low — subjective (ASC 740-10-30-23) |
| Cumulative loss in recent years | Negative | Very high — objective (ASC 740-10-30-21) |
| History of carryforwards expiring unused | Negative | High — objective |
| Losses expected to continue / restructuring pending | Negative | Medium-high |
Worked Example: Same Facts, Two Frameworks
Facts. Delta Components has £30m of unused trading losses at 31 December 2025 and a 25% tax rate, giving a gross DTA of £7.5m. It also has taxable temporary differences (accelerated capital allowances) reversing over the next four years with a tax effect of £4.5m against the same tax authority. Management forecasts return the business to profit but the entity is in a cumulative loss position over 2023-2025. The recoverability conclusion: £4.5m is supported by reversing taxable temporary differences (objective), and management judges a further £1.0m probable from firm backlog; the remaining £2.0m is not supported.
IAS 12 Recognition Entries
Under IAS 12 only the recoverable £5.5m (£4.5m from reversals + £1.0m from backlog) is recognised; the £2.0m unsupported portion is simply never brought onto the balance sheet (IAS 12.24, .34). There is no gross asset and no contra.
| Account | Dr (£m) | Cr (£m) |
|---|---|---|
| Deferred tax asset (SoFP) | 5.5 | |
| Deferred tax income (P&L / tax expense) | 5.5 |
The £2.0m sits off balance sheet as an unrecognised DTA, disclosed under IAS 12.81(e). Net DTA carried: £5.5m.
ASC 740 Gross DTA + Allowance Entries
Under ASC 740 the full £7.5m gross DTA is recognised, then a £2.0m valuation allowance is booked to reduce it to the more-likely-than-not amount of £5.5m (ASC 740-10-30-5; -30-16 to -30-18).
| Account | Dr (£m) | Cr (£m) |
|---|---|---|
| Deferred tax asset — gross (SoFP) | 7.5 | |
| Deferred tax benefit (P&L) | 7.5 | |
| Deferred tax expense (P&L) | 2.0 | |
| Valuation allowance (contra-DTA) | 2.0 |
Net DTA carried: £7.5m − £2.0m allowance = £5.5m. Identical net asset and identical net P&L benefit (£5.5m) to IAS 12 — but the ASC 740 note discloses the £7.5m gross and the £2.0m allowance separately (ASC 740-10-50-2).
Reassessment the Following Year
Recoverability is not a one-off judgement — it is reassessed every reporting date (IAS 12.56; ASC 740-10-30-2). Assume that in 2026 Delta wins a major multi-year contract, exits its cumulative loss position, and the full £30m of losses now becomes probable of use. The previously unrecognised £2.0m is brought back.
| IAS 12 (2026) | Dr (£m) | Cr (£m) |
|---|---|---|
| Deferred tax asset (SoFP) | 2.0 | |
| Deferred tax income (P&L) | 2.0 |
| ASC 740 (2026) — release of allowance | Dr (£m) | Cr (£m) |
|---|---|---|
| Valuation allowance (contra-DTA) | 2.0 | |
| Deferred tax benefit (P&L) | 2.0 |
Under IAS 12 this is a reinstatement of a previously unrecognised asset (IAS 12.37); under ASC 740 it is a "release" of the valuation allowance. Both hit the current-year tax line as a benefit, which is exactly why a large release can flatter earnings — see the case study below.
Auditor Red Flags and the Relevant ISAs
DTA recoverability is a textbook accounting estimate, so the auditor's work is anchored in ISA 540 (Revised), Auditing Accounting Estimates and Related Disclosures. Because the estimate depends on forecasts and on management's assertions about future profit, it also draws on ISA 500 (audit evidence) and, where the entity is loss-making, ISA 570 (going concern). Three red flags recur:
- Optimism bias in the forecast (ISA 540). Management's forecast is the least verifiable evidence supporting the most objective negative indicator (a cumulative loss). ISA 540 requires the auditor to evaluate the method, assumptions and data, and to test for management bias by looking at the accuracy of prior-year forecasts against actuals. A history of forecasts that consistently overshot is a strong signal the current allowance is too low.
- Insufficient corroboration of the source of profit (ISA 500). ISA 500 requires sufficient appropriate evidence. If a DTA rests on "future taxable income", the auditor should trace it to something external — firm backlog, signed contracts, reversing taxable temporary differences — rather than accepting a spreadsheet. A DTA supported only by uncontracted growth in a loss-making entity is a classic overstatement risk.
- Recognising a DTA while flagging going-concern doubt (ISA 570). There is an inherent tension in recognising an asset that depends on future profits in the same accounts that disclose material uncertainty about the entity continuing to trade. ISA 570 requires the auditor to reconcile the two: if going concern relies on the very profits that also justify the DTA, the evidence must be robust and the disclosures consistent, or the DTA should be written down.
Disclosure Requirements
Both frameworks demand transparency about the judgement, because the reader cannot otherwise gauge how fragile the asset is. IAS 12.81(e) requires disclosure of the amount and expiry date of deductible temporary differences, unused tax losses and credits for which no DTA is recognised, and IAS 12.82 requires the amount of a DTA and the supporting evidence when the entity has suffered a loss in the current or preceding period in the relevant tax jurisdiction. ASC 740-10-50-2 requires disclosure of the total gross deferred tax assets, the total valuation allowance, and the net change in the allowance during the year; ASC 740-10-50-8 requires disclosure of the nature of any tax-planning strategy relied upon. In both cases the recoverability judgement is typically also a critical accounting estimate / key audit matter, disclosed in the significant-judgements note.
Case Study: Ford's Valuation Allowance Release
Company. Ford Motor Company (US GAAP, ASC 740). All figures below are taken from Ford's publicly filed Forms 10-K.
What happened. Ford had carried large valuation allowances against US deferred tax assets built up in loss years. As profitability and tax-planning actions improved the realisability outlook, Ford reversed $918 million of previously established US valuation allowances in 2021 and a further $405 million in 2022, each reversal flowing through the income tax line as a benefit (per the income-tax note to Ford's 10-K filings).
Where it left the balance sheet. At 31 December 2023 Ford reported total gross deferred tax assets of $30,982 million, against which it held valuation allowances of $4,187 million, leaving net deferred tax assets of $26,795 million (Ford 2023 Form 10-K, income taxes note). The gross-plus-allowance presentation is exactly the ASC 740 mechanics illustrated above — the reader sees both the $30,982m gross asset and the $4,187m allowance, not just the net.
Why it matters. A release is recognised in the period the more-likely-than-not threshold is met, so it lands as a discrete tax benefit that can materially lift reported earnings in that year. This is precisely why auditors scrutinise the timing of a release: releasing too early (before the positive evidence is objective and verifiable) overstates earnings; releasing too late understates the asset. Under IAS 12 the same economics would appear as the reinstatement of a previously unrecognised DTA (IAS 12.37) rather than the release of a contra account, but the earnings effect would be the same.
Figures are drawn directly from Ford Motor Company's publicly filed Forms 10-K (SEC EDGAR). No figures have been estimated or bridged.
Frequently Asked Questions
What is the difference between IAS 12 and ASC 740 on DTA recoverability?
IAS 12 recognises a DTA only to the extent it is probable future taxable profit will be available (IAS 12.24, .34), carrying the net recoverable amount with no contra account. ASC 740 recognises the full gross DTA then records a separate valuation allowance to reduce it to the "more likely than not" amount (ASC 740-10-30-5). Same net figure, opposite presentation.
Is "probable" the same threshold as "more likely than not"?
Close but not defined identically. "More likely than not" is an explicit greater-than-50% test (ASC 740-10-30-5); IAS 12 does not put a number on "probable" but it is generally read as more likely than not. The bigger practical difference is presentation and the direction of the test.
Why is a cumulative loss position significant negative evidence?
Because it is objective and hard to rebut. ASC 740-10-30-21 to -30-23 treat a cumulative loss over the current and two prior years as significant negative evidence; IAS 12.35 requires convincing other evidence before recognising a DTA on losses where there is a history of recent losses. Forecasts alone rarely overcome it.
What are the sources of future taxable profit?
ASC 740-10-30-18 lists four: reversing taxable temporary differences, future taxable income exclusive of reversals, carryback income, and tax-planning strategies. IAS 12.28-.29 mirrors these. Reversing taxable temporary differences are the strongest because they do not depend on forecasts.
How often is recoverability reassessed?
Every reporting date. IAS 12.56 requires the DTA carrying amount to be reviewed and reduced (or reinstated) as recoverability changes; ASC 740-10-30-2 requires the valuation allowance to be reassessed each period on all available evidence.
What is a tax-planning strategy?
A prudent, feasible action management would actually take to stop a loss or credit expiring unused — for example selling an appreciated asset or switching to taxable investments (ASC 740-10-30-19; IAS 12.30). Net-of-cost benefit is what counts, and the strategy must be disclosed (ASC 740-10-50-8).
Does an IFRS DTA reduction go through profit or loss?
Yes, unless the related item was recognised in OCI or equity, in which case the tax follows it there. A reduction because recoverability is no longer probable is charged to the tax line in P&L (IAS 12.56), and a later reinstatement is credited there (IAS 12.37).
• IAS 12 Tax Loss Carryforwards: DTA Recognition & Utilization
• IAS 12 Tax Rate Changes: Remeasuring Deferred Tax Balances
• IAS 12 Deferred Tax on OCI: Recognizing Tax Effects in Other Comprehensive Income
• IAS 12 in M&A: Deferred Tax on Acquisition Fair Value Adjustments
About the author
Usman Qureshi is a Chartered Certified Accountant (ACCA) working in audit and advisory. He writes the IFRS, FRS 102 and US GAAP guides published on this site. Membership is listed on the ACCA public register.