Deferred Tax and the AI Capitalisation Question (IAS 12 Meets IAS 38)

The Consequence Teams Miss

Capitalising AI development is now common — the earlier piece in this series covered how IAS 38 applies to fine-tuning, embeddings and agent frameworks. What is often missed is the second-order consequence: the moment an internally-generated intangible sits on the balance sheet with a carrying value that differs from its tax base, IAS 12 requires a deferred tax entry to reflect the future tax effect of that difference reversing.

This is not optional and it is not immaterial for a company capitalising six or seven figures of AI development. A capitalisation entry without the corresponding deferred tax entry is an incomplete accounting treatment that the auditor will pick up.

The Temporary Difference

The mechanism is a temporary difference. When AI development is capitalised for accounting purposes but the tax treatment differs — for example, where the expenditure has been relieved for tax differently from its accounting amortisation — the accounting carrying value and the tax base of the asset diverge. That divergence is a temporary difference: it will reverse over time as the asset is amortised for accounting and relieved for tax, and the two eventually converge.

A taxable temporary difference (carrying value above tax base) generates a deferred tax liability — the future tax the company will pay as the difference reverses. A deductible temporary difference (tax base above carrying value) generates a deferred tax asset, subject to a recoverability test. For most AI capitalisation, where the asset is carried at a value that has already been relieved for tax, the result is a deferred tax liability.

Computing the Provision

The deferred tax is measured by applying the tax rate expected to apply when the temporary difference reverses to the amount of the difference. For a UK company, that is the corporation tax rate expected in the reversal periods — currently the 25 per cent main rate, subject to any enacted future change. The provision is a balance-sheet item; the movement in it each period runs through the tax charge (or, where the underlying item is in other comprehensive income or equity, through OCI or equity).

The practical computation for a capitalised AI intangible: take the carrying value at the period end, determine the tax base, compute the temporary difference, and apply the expected rate. As the asset amortises and the tax relief unwinds, the temporary difference changes each period, so the provision is re-measured every reporting date rather than set once.

The UK Tax Interaction

The UK corporate intangibles regime governs how intangible fixed assets are relieved for tax, and the interaction with the accounting treatment determines the temporary difference. Where the tax relief follows the accounting amortisation, the temporary difference may be small; where the expenditure has been relieved differently — for example through a different tax deduction profile, or where R&D relief has been claimed on the same underlying costs — the difference can be significant.

The R&D interaction is worth specific attention. Where the same AI development costs have attracted R&D relief and been capitalised for accounting, the tax base and the accounting treatment can diverge materially, and the deferred tax computation needs to reflect the actual tax relief taken, not a simplifying assumption. Get the tax adviser and the accounting team into the same conversation on this.

Deferred Tax Assets and Losses

Many growth-stage fintechs are loss-making and carry tax losses. This complicates the deferred tax picture in a useful direction: a deferred tax asset can be recognised for carried-forward losses and for deductible temporary differences, but only to the extent it is probable that future taxable profit will be available against which the asset can be used. This is a judgement, and it is one the auditor scrutinises.

For a business that is loss-making now but forecasts profitability, the recoverability test turns on the credibility of the forecast. A company with a driver-based forecast showing a clear path to profit has a stronger basis for recognising the asset than one relying on optimistic assertions. The deferred tax asset recognition is therefore partly a function of forecast quality — another reason the forecast rigour discussed elsewhere in this series matters.

Disclosure and the Auditor

IAS 12 requires disclosure of the deferred tax balances, the movement in the period, and the components of the temporary differences. For a company with material capitalised AI intangibles, the auditor will expect to see: the deferred tax liability arising on the AI intangibles, the basis of measurement, and — if a deferred tax asset is recognised on losses — the evidence supporting recoverability.

The audit-readiness discipline is to document the deferred tax computation alongside the capitalisation policy, so that the two are presented as a coherent whole. An auditor who sees the AI intangibles capitalised with no deferred tax working will raise it; an auditor who sees both, computed consistently, moves on.

Key Takeaways

• Capitalising AI development under IAS 38 usually creates a temporary difference between accounting carrying value and tax base, which under IAS 12 requires a deferred tax entry.
• A taxable temporary difference generates a deferred tax liability; a deductible one generates a deferred tax asset subject to a recoverability test. Most AI capitalisation produces a liability.
• Measure the provision at the tax rate expected when the difference reverses — currently the 25 per cent UK main rate — and re-measure every reporting date as the asset amortises.
• The UK intangibles regime and any R&D relief taken on the same costs affect the tax base; get the tax and accounting teams into one conversation on this.
• A deferred tax asset on losses can be recognised only where future taxable profit is probable — so recognition depends partly on forecast credibility.
• Document the deferred tax computation alongside the capitalisation policy so the auditor sees a coherent whole rather than a capitalisation with no tax working.