In business combinations, purchase price allocation (PPA) creates fair value step-ups on identifiable assets and liabilities. These step-ups are often not tax-deductible, creating deferred tax liabilities. This guide covers the mechanics, goodwill impact, and audit scrutiny around acquisition-related deferred tax.
Why Acquisition Deferred Tax Matters
In an acquisition, the buyer pays (say) £100m for assets with a book value of £60m. The £40m step-up is recognized at fair value (IFRS). But tax authorities often allow no tax deduction for the step-up (except depreciation on PP&E).
Result: Deferred tax liability is created on non-deductible step-ups, which reduces goodwill (or increases the "cost" of the acquisition).
Deductible vs Non-Deductible Step-Ups
Deductible (Create DTA, not DTL)
- Warranty provisions: Deductible when paid (creates DTA)
- Accruals/payables: Deductible when paid (creates DTA)
Non-Deductible (Create DTL)
- Goodwill: Tax non-deductible in most jurisdictions (creates DTL)
- Intangible assets: Often non-deductible (patents, customer lists, trade names); some exceptions (software depreciation)
- PP&E fair value increase: Depreciation is deductible, but the fair value increase above cost is not (creates DTL)
- Investment property revaluation: Usually non-deductible until sale (creates DTL)
Calculation of Acquisition DTL
Step 1: Identify Fair Value Adjustments
All amounts by which fair value exceeds tax base at acquisition date.
Step 2: Determine Tax Deductibility
Will this adjustment create a tax deduction? If no, a DTL applies.
Step 3: Apply Tax Rate
Step 4: Offset Against Goodwill
The DTL reduces goodwill (or is recognized as a separate liability, depending on classification).
Worked Example: Acquisition with Deferred Tax Step-Up
Deal Overview
Buyer: GlobalCorp
Target: AcquireCo
Purchase price: £150m
Tax rate: 19%
Fair Value Adjustments (PPA)
| Asset/Liability | Book Value | Fair Value | Adjustment | Tax Deductible? |
|---|---|---|---|---|
| Inventory | 20 | 22 | 2 | Yes (deducted cost of sales) |
| PP&E | 40 | 55 | 15 | Partial (depreciation deductible) |
| Intangible: Software | 0 | 20 | 20 | No (non-deductible) |
| Intangible: Customer List | 0 | 15 | 15 | No (non-deductible) |
| Provision: Warranty | 0 | (8) | (8) | Yes (deductible when paid) |
Deferred Tax Impact
Non-Deductible Adjustments (Create DTL)
- Intangible: Software — £20m × 19% = £3.8m DTL
- Intangible: Customer List — £15m × 19% = £2.85m DTL
- Total non-deductible DTL: £6.65m
Deductible Adjustments (Create DTA)
- Warranty provision — (£8m) × 19% = (£1.52m) DTA
- Total deductible DTA: (£1.52m)
PP&E Partial Deduction
- PP&E fair value increase: £15m
- Estimated useful life: 10 years
- Annual depreciation deduction: £1.5m
- DTL (present value of future tax cost): ~£3m (conservative; depends on discount rate)
Net Deferred Tax Position
- Total DTL from adjustments: £6.65m + £3m = £9.65m
- Total DTA from adjustments: (£1.52m)
- Net DTL: £9.65m −’ £1.52m = £8.13m
PPA Goodwill Calculation (Impact of DTL)
- Consideration: £150m
- Fair value of identifiable net assets: Assume £80m (before deferred tax)
- Deferred tax liability (to be recognized): (£8.13m)
- Net identifiable assets (after DTL): £80m −’ £8.13m = £71.87m
- Goodwill: £150m −’ £71.87m = £78.13m
Key point: The £8.13m DTL reduces the "net" identifiable assets, increasing goodwill. Higher goodwill = more impairment testing risk post-acquisition.
Future Reversal of Acquisition DTL
Depreciation Reversal
As PP&E is depreciated for tax purposes, the DTL reverses:
- Year 1: Depreciation deduction £1.5m →’ Tax benefit £0.285m →’ DTL reverses by £0.285m
- Years 2— 10: Similar reversals continue
Impairment/Sale Reversal
If intangible assets (software, customer list) become impaired or are disposed:
- Book loss: Write-down of intangible asset
- Tax treatment: No tax deduction (was non-deductible on acquisition)
- DTL reversal: DTL remains; no reversal on impairment
Audit Red Flags: Acquisition DTL
Red Flag 1: DTL Not Recognized
Finding: PPA includes £30m of non-deductible intangibles, but no DTL recognized.
Auditor action: Calculate DTL (£30m × tax rate); recognize liability; reduce goodwill or increase P&L tax expense.
Red Flag 2: Incorrect Tax Deductibility Assessment
Finding: Customer list assumed non-deductible in the US (correct); but also treated as non-deductible in the UK (incorrect — UK allows amortization of intangibles acquired post-2002 as tax-deductible).
Auditor action: Reassess by jurisdiction; recognize DTA for UK amortization; reduce DTL.
Red Flag 3: DTL Not Remeasured for Rate Change
Finding: Tax rate changes post-acquisition; acquisition DTL not remeasured.
Auditor action: Remeasure DTL at new rate; adjust balance sheet and P&L (or goodwill if within measurement period).
Red Flag 4: Goodwill Calculation Omits DTL
Finding: Goodwill calculated as Consideration −’ Fair Value of Net Assets, with no DTL deduction.
Auditor action: Goodwill calculation must account for the DTL liability; reduce goodwill by DTL amount.
Real-Life Case Study: Deferred Tax on Acquired Intangibles
Scenario. In a business combination, an acquirer recognises a £8m customer-relationship intangible. For tax, no deduction is available (tax base nil). Tax rate 25%.
Treatment. A taxable temporary difference of £8m arises, so a £2m deferred tax liability is recognised at acquisition. Because it is recognised as part of the acquisition accounting, the offsetting entry increases goodwill, it does not go to P&L.
Takeaway. Fair-valuing intangibles in a PPA almost always drags a deferred tax liability with it, and that DTL grosses up goodwill. Omitting it understates both goodwill and liabilities on day one.
Illustrative composite scenario for educational purposes. Figures are indicative and do not represent any specific company.
• IAS 12 Tax Loss Carryforwards: DTA Recognition & Utilization
• IAS 12 Valuation Allowances: DTA Realizability Assessment
• IAS 12 Tax Rate Changes: Remeasuring Deferred Tax Balances
• IAS 12 Deferred Tax on OCI: Recognizing Tax Effects in Other Comprehensive Income