## Timing Differences vs Permanent Differences

Not all gaps between book and tax profit are equal. The critical question is: will this difference ever reverse in a future period?

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### Timing Differences

> Differences between accounting income and taxable income that originate in one period and are capable of reversal in one or more subsequent periods.

The gap exists today but will close in a future period.

→ Deferred Tax IS created on timing differences.

Common examples:

Situation	Book Treatment	Tax Treatment	Reversal
Prepaid expense	Expensed on accrual	Allowed only when cash paid	Reverses when paid
Preliminary expenses	Written off immediately	Amortised in tax over several years	Reverses during tax amortisation
Accelerated depreciation (tax)	SLM as per Companies Act	Higher rate under Income Tax Act	Reverses as asset ages
Revenue recognised early in books	Booked this year	Taxable in a future year	Reverses when taxed
Accrued interest (not yet paid)	Expensed on accrual	Deductible only when paid	Reverses when paid

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### Permanent Differences

> Differences between accounting income and taxable income that originate in one period and do not reverse subsequently.

These arise because certain items are permanently treated differently under accounting law vs. tax law. No future period will ever close the gap.

→ Deferred Tax is NOT created on permanent differences.

Common examples:

Item	Books	Tax Treatment
Fines & Penalties	Expensed	Permanently disallowed — never
Donations to Public Trusts	Expensed	Permanently disallowed — never
Income exempt under tax law	Included in income	Not taxable — ever

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### Decision Tree

```

Is there a difference between book and tax profit?

↓

Will it EVER close in a future period?

YES → Timing Difference → CREATE Deferred Tax

NO → Permanent Difference → NO Deferred Tax

```

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### Summary Table

Difference Type	Creates DT?	Examples
Timing	✓ Yes	Depreciation, preliminary exp, accrued exp
Permanent	✗ No	Fines, penalties, donations, exempt income

Worked example

### Example 1

### Depreciation — Timing Difference → DTL (Tax Rate 30%)

Depreciation as per books: ₹2,00,000 | As per tax: ₹5,00,000

Particulars	Books	Tax	Difference	DT @ 30%	Type
Depreciation	2,00,000	5,00,000	3,00,000	₹90,000	DTL

Tax allows ₹3L more expense today → pays less tax today → will pay more tax in future → DTL

> Logic: "Aaj tax kum, future mein zyada → DTL"

### Example 2

### Preliminary Expenses — Timing Difference → DTA (Tax Rate 30%)

Preliminary expenses ₹30,000 — fully written off in books. Not yet allowed in tax (allowed in future years).

Particulars	Books	Tax	Difference	DT @ 30%	Type
Preliminary Exp	30,000	NIL	30,000	₹9,000	DTA

Books deduct ₹30,000 today, tax doesn't → paid more tax today → future tax saving → DTA

### Example 3

### Accrued Interest — Timing Difference → DTA (Tax Rate 25%)

Interest expense ₹3,00,000 accrued but not yet paid. Allowed in books on accrual basis; disallowed in tax until paid.

Particulars	Books	Tax	Difference	DT @ 25%	Type
Interest Expense	3,00,000	NIL	3,00,000	₹75,000	DTA

Paid more tax today (interest not yet deductible in tax) → will get deduction when paid → DTA

### Example 4

### Fines & Penalties — Permanent Difference → NO DT (Tax Rate 30%)

Fines & penalties ₹50,000 expensed in books. Permanently disallowed in tax — will never be allowed.

Particulars	Books	Tax	Difference	Type	DT
Fines & Penalties	50,000	NIL	50,000	Permanent	NIL

This difference will never reverse. No deferred tax is created.

### Example 5

### Combined Example — Both Timing Differences in One Year (Tax Rate 50%)

Particulars	Books	Tax	Difference	DT @ 50%	Type
Depreciation	2,00,000	5,00,000	3,00,000	1,50,000	DTL
Preliminary Exp	30,000	NIL	30,000	15,000	DTA
Net				₹1,35,000	Net DTL

P&L shows net deferred tax charge of ₹1,35,000 (DTL net of DTA).

⚠️ Common exam mistakes

Creating deferred tax on fines and penalties — these are permanent differences; no DT ever arises
Confusing direction for expenses: Tax expense > Book expense means tax paid LESS today → DTL (not DTA)
Treating exempt income (e.g., certain dividends) as a timing difference when it is in fact a permanent difference
Netting permanent and timing differences together before computing DT — only timing differences enter the DT calculation

Bare-Act text Para 3 — Definitions · AS 22 — Accounting for Taxes on Income · click to expand

Timing differences are differences between taxable income and accounting income for a period that originate in one period and are capable of reversal in one or more subsequent periods. Permanent differences are differences between taxable income and accounting income for a period that originate in one period and do not reverse subsequently.

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AS 22 — Timing Differences vs Permanent Differences

Worked example

⚠️ Common exam mistakes