How do temporary differences create deferred tax assets and liabilities?
I'm struggling with deferred taxes for CFA Level I. I understand that DTAs and DTLs arise from timing differences between book and tax, but I can't consistently identify which direction the difference goes. For instance, when does accelerated tax depreciation create a DTL versus a DTA? A clear framework would help.
Deferred taxes arise because accounting rules (IFRS/GAAP) and tax rules often recognize revenues and expenses in different periods. The key is understanding temporary differences, which reverse over time.
The Framework:
A Deferred Tax Liability (DTL) arises when taxable income will be higher than book income in the future (you paid less tax now, you will pay more later).
A Deferred Tax Asset (DTA) arises when taxable income will be lower than book income in the future (you paid more tax now, you will pay less later).
Common Examples:
| Source | Book vs Tax | Result |
|---|---|---|
| Accelerated depreciation for tax | Book depreciation < Tax depreciation now | DTL (lower tax expense now, higher later) |
| Warranty provision | Book recognizes expense now, tax deducts when paid | DTA (higher tax now, lower when claims paid) |
| Prepaid rent received | Tax recognizes income now, book defers it | DTA (paid tax early) |
| Capitalized R&D (book) vs expensed (tax) | Book capitalizes, tax expenses immediately | DTA (tax already deducted it) |
Worked Example — Accelerated Depreciation:
Pinewell Manufacturing buys a machine for $200,000. Book life: 5 years SL. Tax life: 3 years SL. Tax rate: 30%.
| Year | Book Depr | Tax Depr | Difference | Cumulative |
|---|---|---|---|---|
| 1 | $40,000 | $66,667 | $26,667 | $26,667 |
| 2 | $40,000 | $66,667 | $26,667 | $53,333 |
| 3 | $40,000 | $66,666 | $26,666 | $80,000 |
| 4 | $40,000 | $0 | ($40,000) | $40,000 |
| 5 | $40,000 | $0 | ($40,000) | $0 |
In Years 1-3, the asset's carrying value on the books exceeds its tax base (because tax depreciated it faster). This creates a DTL = cumulative difference x tax rate.
Year 2 DTL = $53,333 x 30% = $16,000
In Years 4-5, the difference reverses — book depreciation exceeds tax depreciation, and the DTL unwinds to zero.
Exam tip: Always compare carrying value to tax base. If the asset's book value is higher, future taxable amounts result (DTL). If lower, future deductible amounts result (DTA). For liabilities, the logic flips.
Dive deeper into deferred taxes in our CFA Level I FRA course.
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