Module I· Deferred Taxes (DTA/DTL)Advanced
Question
What is a permanent difference, and how does it differ from a temporary difference?
Answer
Mechanics
Two kinds of difference between book value and the tax base that are accounted for very differently.
- Temporary difference: a difference between book value and tax base that reverses at some point. Creates a DTA or DTL.
- Permanent difference: a difference between income-statement expense/income and its tax treatment that never reverses. Creates NO deferred tax, but rather an ETR deviation from the statutory rate.
Deep diveShow more details
Examples of temporary differences
Faster tax depreciation vs. book depreciation, pension provisions with a different discount rate, inventory valuation, loss carryforwards.
Examples of permanent differences
- Goodwill impairment: deductible in the IFRS income statement, but not in the tax books in some jurisdictions (goodwill is amortized for tax on a fixed schedule, e.g. over 15 years, rather than via impairment) — a permanent difference.
- Investment income (participation exemption): dividends and capital gains from qualifying shareholdings are largely tax-exempt (~95% in many jurisdictions) — a permanent ETR reduction.
- Fines and penalties: expensed in the income statement, not deductible for tax — a permanent ETR increase.
- Meals/entertainment: only partly deductible for tax (e.g. 70%) — a permanent difference.
- R&D tax credit: reduces tax directly, with no income-statement expense effect.
ETR modeling
Permanent differences are the main reason the ETR deviates from the statutory rate.
Pitch tip
'The participation exemption on investment income reduces the ETR from 30% to 26% in holding structures; cross-check: Industrial Manufacturing Co (a holding company) structurally shows 26%, not a one-off'.