Temporary vs Permanent Differences — Why Only Temporary Differences Create Deferred Tax Under Ind AS 12

If you are studying Financial Reporting at CA Final level, Ind AS 12 — Income Taxes — is one of those topics that can either score you big marks or trip you up badly. The concept that confuses students the most is this: why do temporary differences create deferred tax, but permanent differences do not?

Let me walk you through the logic in the simplest possible way.

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What Is the Core Idea Behind Deferred Tax?

Deferred tax exists because accounting profit and taxable profit do not always match in the same year. When they differ, the tax consequence gets shifted to a future period. Deferred tax is simply the mechanism to recognise that future tax effect today, so your financial statements present a true picture.

The key word is future. If there is no future tax consequence, there is nothing to defer.

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Permanent Differences — No Future, No Deferral

A permanent difference arises when an item is recognised in the books of accounts but will never appear in the tax computation — or vice versa — at any point in time.

Why does this happen?

Tax law simply excludes certain items permanently. The difference does not reverse in any future year. It is a one-time, done-and-gone divergence.

A Simple Example

Suppose a company pays a fine to a government authority. The fine is recorded as an expense in the income statement (reduces accounting profit). However, tax law disallows such fines as a deduction — forever. Next year, the year after, and in every future year, this fine will still be disallowed. There is no future period in which the tax treatment will "catch up" with the accounting treatment.

Because there is no reversal, there is no deferred tax. The only effect is that the effective tax rate differs from the standard rate — which is disclosed in the tax reconciliation note, but no deferred tax asset or liability is created.

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Temporary Differences — A Timing Gap That Will Close

A temporary difference arises when the carrying amount of an asset or liability in the balance sheet differs from its tax base (the amount attributed to that asset or liability for tax purposes). Crucially, this gap will reverse in one or more future periods.

Ind AS 12 defines two types:

  • Taxable Temporary Differences → give rise to a Deferred Tax Liability (DTL)
  • Deductible Temporary Differences → give rise to a Deferred Tax Asset (DTA)

Logic of a Taxable Temporary Difference

Imagine a machine with a carrying amount of ₹8,00,000 in the books (after accounting depreciation) but a tax base of ₹5,00,000 (after accelerated depreciation allowed by tax law). The carrying amount exceeds the tax base by ₹3,00,000.

What does this mean? In future years, the company will claim less depreciation for tax purposes (because the tax base is already lower), so taxable profit will be higher than accounting profit in those future years. The company will pay more tax in the future. That is a future liability — hence a Deferred Tax Liability.

Logic of a Deductible Temporary Difference

Now consider a provision for warranty of ₹2,00,000 recognised in the income statement this year. Tax law allows this deduction only when the expense is actually paid, not when it is provided. So the tax base of this liability is ₹nil (no future tax deduction left, because tax will allow it when paid).

Wait — let us think again. The liability's carrying amount is ₹2,00,000 but its tax base is ₹nil (because tax will give a deduction in the future when cash is paid). This means in the future, a deduction will arise for tax that has already been charged to accounting profit. Future taxable profit will be lower than accounting profit — saving future tax. That saving is a Deferred Tax Asset.

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The Reversal Test — Your Practical Check

Whenever you see a difference between accounting and tax treatment, ask yourself one question:

> "Will this difference reverse in a future period?"

  • Yes → Temporary difference → Recognise deferred tax (DTL or DTA as applicable)
  • No → Permanent difference → No deferred tax; only affects the tax rate reconciliation

This single test is the heart of Ind AS 12.

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Key Takeaways for Your Exam

  • Ind AS 12 is balance-sheet focused — it compares carrying amounts with tax bases, not just timing of income/expense recognition.
  • Deferred tax is always calculated at the tax rate expected to apply when the temporary difference reverses (verify the exact rate guidance in the latest ICAI study material).
  • Permanent differences affect the effective tax rate but create no balance-sheet entry.
  • A deferred tax asset is recognised only to the extent it is probable that future taxable profit will be available to absorb it — do not forget this condition when writing exam answers.
  • Certain temporary differences have specific initial recognition exemptions under Ind AS 12 (verify details in the latest ICAI study material / announcement).

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Quick Comparison Table

| Feature | Permanent Difference | Temporary Difference | |---|---|---| | Will it reverse? | Never | Yes, in future periods | | Creates deferred tax? | No | Yes (DTL or DTA) | | Balance-sheet entry? | No | Yes | | Effect on financials | Changes effective tax rate | Creates DTL / DTA |

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FAQs

Q1. Can a permanent difference ever become a temporary difference? No. By definition, a permanent difference has no future reversal. If a difference reverses even partially in a future year, it was a temporary difference to begin with.

Q2. What if the deferred tax asset is very large — do we always recognise the full amount? No. Under Ind AS 12, a deferred tax asset is recognised only to the extent it is probable that sufficient future taxable profit will be available. If future profitability is uncertain, partial or no recognition may be appropriate.

Q3. Is the treatment under old AS 22 different from Ind AS 12? Yes, significantly. AS 22 was based on the timing difference approach (income-statement focused), while Ind AS 12 uses the temporary difference approach (balance-sheet focused). This is why Ind AS 12 can capture differences that AS 22 would miss, such as fair-value adjustments. Always verify the current syllabus requirements in the latest ICAI study material.

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Understanding the why behind deferred tax — not just the journal entries — is what separates average answers from high-scoring ones in CA Final FR. To make sure you cover every concept in the right sequence without missing revision days, use the free day-by-day study planner at https://caparveensharma.com/free-planner?src=article. And when you want to test yourself on real-scenario-based Ind AS 12 problems, head over to caparveensharma.com where free case-scenario practice is available inside the courses. Consistent practice on application questions is what makes the difference on exam day.