Deferred Tax — Accelerated Capital Allowances vs. UoP Amortisation
Recording the deferred tax on the timing difference between accelerated tax depreciation and accounting UoP amortisation.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Deferred Tax Asset (Development Capex) | Asset (+) | 15,000,000.00 | - |
| Deferred Tax Benefit | Revenue (+) | - | 15,000,000.00 |
💡 Accountant's Note
In many mining jurisdictions, capital expenditure on mine development is immediately deductible for tax (100% deduction in year of expenditure) while for accounting it is capitalised and amortised over the mine life using UoP. This creates a large deferred tax asset in the development years (tax benefit taken upfront; accounting charge spread over mine life). As the mine produces, the DTA unwinds — higher taxable profits relative to accounting profits in production years.
Practitioner & Systems Framework
💻 ERP Architecture
The deferred tax calculation for mining requires maintaining a shadow 'tax asset register' that tracks the tax written-down value of each mining asset separately from the accounting NBV. The DTA = (accounting NBV - tax written-down value) × tax rate. For development-stage operations with 100% capital allowances, the tax WDV reaches zero in the first year of the allowance — the entire accounting NBV represents a DTA. As production proceeds, the DTA unwinds each year as UoP amortisation reduces the accounting NBV while the tax WDV (already zero) remains at zero. The DTA is recognised only to the extent it is probable that future taxable profits will be available for utilisation.
⚠️ Audit Flags
Auditors test the DTA recoverability assessment — for mines with long development periods or mines in lower-grade commodity environments, the probability of recovering large DTAs against future taxable profits requires careful analysis. Test the LOM financial model's projected taxable profits against the DTA balance. Confirm that the shadow tax asset register correctly reflects all capital allowances taken in prior periods. Review the ring-fencing constraint — if the DTA can only be utilised against future profits from the same mine (due to ring-fencing), the recovery timeline may extend significantly.
📄 Required Documentation
Shadow tax asset register (tax WDV vs. accounting NBV per asset), capital allowance calculations per jurisdiction, DTA recoverability assessment (LOM projected taxable profits), ring-fencing analysis, deferred tax roll-forward, effective tax rate reconciliation, and tax adviser confirmation of applicable capital allowance rates and deductibility rules.
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