Corporate Income Taxes

Introduction and context

Corporate income tax affects both the measurement of profit and the presentation of a company’s financial position. A company may report profit under accounting standards, while tax legislation determines a separate taxable profit. The two amounts often differ because accounting standards and tax rules pursue different objectives. Accounting profit aims to provide useful information to users; taxable profit applies statutory rules for raising government revenue.

The resulting differences create two related accounting questions:

1. How much current tax is payable for the reporting period?
2. How will current transactions affect tax payments in future periods?

Corporate income tax accounting therefore includes current tax and deferred tax. This chapter uses the principles of IAS 12 Income Taxes. Local tax legislation and any jurisdiction-specific reporting requirements must also be consulted.

Learning objectives

By the end of this chapter, a student should be able to:

• distinguish accounting profit, taxable profit, current tax and deferred tax;
• calculate current tax from taxable profit and the applicable tax rate;
• identify permanent differences and temporary differences;
• determine the tax base of assets and liabilities;
• recognise and measure deferred tax assets and liabilities;
• explain the presentation of tax expense and tax balances;
• prepare a reconciliation between accounting profit and taxable profit;
• reconcile the effective tax rate with the statutory tax rate; and
• evaluate the professional, ethical and governance issues associated with corporate tax reporting.

1. The tax-accounting framework

Accounting profit and taxable profit

Accounting profit is profit or loss before tax, measured under the applicable financial reporting framework. Taxable profit, sometimes called tax-adjusted profit, is the amount determined under tax legislation on which income tax is payable.

A simplified current-tax calculation is:

Taxable profit and the tax rate must be determined under the relevant jurisdiction’s law. The equation assumes a single tax rate and no tax credits, loss relief, minimum taxes or other adjustments. Where several rates apply, the calculation must be performed by tax category or band.

Current tax expense is the current-period tax based on taxable profit, adjusted where appropriate for current and prior-period tax estimates. Current tax payable is the amount owed to the tax authority after considering tax payments, withholding taxes and recoverable credits.

Permanent and temporary differences

A difference between accounting profit and taxable profit may be:

• Permanent: it affects accounting profit or taxable profit but will never reverse in a later period. Permanent differences affect the effective tax rate but do not create deferred tax.
• Temporary: it arises because an asset or liability is recognised at one amount in the financial statements and its tax base is another amount. Temporary differences reverse in future periods and generally create deferred tax.

Examples of permanent differences include non-deductible penalties and, in some jurisdictions, exempt dividend income. Examples of temporary differences include accelerated tax depreciation, provisions deductible only when paid, and fair-value gains recognised in accounting before tax recognition.

2. Current tax: calculation and reconciliation

A company normally begins with accounting profit before tax and makes tax adjustments. A generic reconciliation is:

The precise adjustments depend on local tax law. An accountant must not assume that an accounting expense is tax-deductible merely because it is recognised in profit or loss.

Worked example 1: current tax

Illustrative Company reports accounting profit before tax of $500,000. Included in expenses are:

• accounting depreciation of $90,000;
• a penalty of $10,000 that is not tax-deductible; and
• a warranty provision of $40,000 deductible only when claims are paid.

Tax depreciation for the year is $130,000. Assume no other adjustments and a corporate tax rate of 25%.

Taxable profit is calculated as follows:

The penalty is a permanent difference. The depreciation difference and warranty provision are temporary differences and may generate deferred tax.

3. Temporary differences and the balance-sheet approach

IAS 12 uses the balance-sheet liability method. Deferred tax is based on temporary differences between the carrying amount of an asset or liability and its tax base.

Carrying amount

The carrying amount is the amount at which an asset or liability is recognised in the statement of financial position after accumulated depreciation, impairment, provisions or other adjustments.

Tax base of an asset

The tax base of an asset is the amount attributable to that asset that will be deductible for tax purposes against future taxable economic benefits. If future economic benefits will not be taxable, the tax base is generally equal to the carrying amount.

Tax base of a liability

The tax base of a liability is its carrying amount less any amount that will be deductible for tax purposes in future periods. For revenue received in advance, the tax base is generally the carrying amount less any amount of revenue that will not be taxable in the future.

The following test is useful:

• If recovery or settlement of the carrying amount will produce future taxable amounts, the difference may be a taxable temporary difference and a deferred tax liability.
• If recovery or settlement will produce future tax deductions, the difference may be a deductible temporary difference and a deferred tax asset.

A compact classification table follows.

This table is a practical rule, but the underlying question remains: what tax consequences arise when the asset is recovered or the liability is settled?

Deferred tax measurement

The basic measurement formula is:

The tax rate must be the rate expected to apply when the difference reverses, based on tax laws enacted or substantively enacted at the reporting date. Deferred tax is not normally discounted, even where reversal is expected over several years.

4. Deferred tax liabilities

A deferred tax liability (DTL) represents income tax payable in future periods because of taxable temporary differences existing at the reporting date.

Worked example 2: accelerated tax depreciation

A machine has a carrying amount of $360,000 at year-end. Its tax base is $280,000 because tax depreciation has been claimed faster than accounting depreciation. The enacted tax rate is 25%.

The DTL reflects the tax expected to arise when the machine’s carrying amount is recovered through use or sale. If the temporary difference arose through a transaction recognised in profit or loss, the related deferred tax is generally recognised in tax expense. If it arose in other comprehensive income or directly in equity, the related deferred tax follows that location.

Common sources of DTLs include:

• tax depreciation that exceeds accounting depreciation;
• revaluation gains recognised in accounting but taxed later;
• fair-value gains on investments where tax is deferred until disposal; and
• business combinations in which identifiable assets are recognised at fair value but have different tax bases.

5. Deferred tax assets

A deferred tax asset (DTA) represents future tax relief arising from deductible temporary differences, unused tax losses or unused tax credits.

A DTA is recognised only to the extent that it is probable that sufficient future taxable profit will be available against which the deductible difference, loss or credit can be used. This recognition threshold prevents companies from presenting tax benefits that may never be realised.

Worked example 3: provision deductible on payment

A company recognises a warranty provision of $40,000 in its financial statements. Tax law permits a deduction only when warranty claims are paid. The company expects the provision to be deductible in a future period. The tax rate is 25%.

At reporting date:

• carrying amount of the liability = $40,000;
• tax base = $0, because no future tax deduction has yet been received in the tax computation;
• deductible temporary difference = $40,000.

When the warranty cost is paid, the company will receive a tax deduction, reducing future taxable profit. The DTA is recognised only if evidence supports probable utilisation, such as a history of taxable profits, approved budgets or sufficient taxable temporary differences reversing in the appropriate period.

Unused tax losses

Tax losses may create a DTA, but recognition requires persuasive evidence of future taxable profits or tax-planning opportunities. Evidence against recognition includes:

• recent repeated losses;
• forecasts that are unsupported or inconsistent with performance;
• losses arising from conditions expected to continue; and
• expiry dates that make utilisation unlikely.

Recognised DTAs must be reassessed at each reporting date. A previously unrecognised DTA is recognised when recovery becomes probable; a recognised DTA is reduced when recovery is no longer probable.

6. Exceptions and special recognition issues

IAS 12 contains detailed exceptions, including rules concerning goodwill, initial recognition transactions and investments in subsidiaries, associates and joint arrangements. These rules have evolved, and recent amendments address deferred tax arising from transactions such as leases and decommissioning obligations. Students should therefore consult the current standard rather than relying on simplified rules alone.

A particularly important principle is that deferred tax is not recognised mechanically for every difference. The accountant must consider:

• the nature and origin of the transaction;
• whether the transaction affects accounting profit, other comprehensive income or equity;
• whether the relevant recognition exception applies;
• the expected manner of recovery or settlement; and
• whether the tax rate and tax law are enacted or substantively enacted.

7. Tax expense and financial-statement presentation

Total income tax expense or income is commonly analysed as:

A deferred tax expense occurs when recognised DTLs increase or DTAs decrease, subject to the required presentation location. Deferred tax income occurs when recognised DTAs increase or DTLs decrease.

This equation is a presentation framework, not a substitute for analysing the individual temporary differences. For example, tax relating to a revaluation recognised in other comprehensive income should generally be recognised in other comprehensive income rather than being included entirely in profit or loss.

Deferred tax assets and liabilities are presented as non-current under many reporting presentations, but the applicable reporting framework and jurisdictional requirements should be checked. Offsetting is permitted only when the relevant legal and accounting conditions are satisfied, including enforceable rights of set-off and appropriate relation to the same tax authority or tax arrangements.

8. Effective tax-rate reconciliation

The effective tax rate (ETR) explains the relationship between tax expense and accounting profit before tax:

The formula assumes accounting profit before tax is positive. If profit before tax is zero or negative, the percentage may be meaningless or require careful explanation.

The statutory tax rate is the rate prescribed by law for the relevant company and income. The ETR differs from the statutory rate because of permanent differences, tax incentives, losses, rate changes, foreign operations, prior-period adjustments and deferred tax recognition judgments.

Worked example 4: ETR reconciliation

A company reports accounting profit before tax of $500,000 and total income tax expense of $132,500. Its statutory rate is 25%. A non-deductible penalty of $10,000 is the only item causing a difference from the statutory rate.

Tax at the statutory rate is:

Additional tax caused by the penalty is:

If the remaining $5,000 of tax expense represents a prior-period adjustment or another separately identified item, the reconciliation should disclose it rather than obscure it. The ETR is:

A sound reconciliation identifies material reconciling items and explains unusual movements from one period to the next.

9. Detailed illustrative case: Meridian Manufacturing Ltd

Background

Meridian Manufacturing Ltd prepares financial statements for the year ended 31 December. Accounting profit before tax is $800,000. The tax rate is 30%. The following items require analysis:

• accounting depreciation: $160,000;
• tax depreciation: $220,000;
• a legal penalty: $20,000, not deductible;
• an environmental provision: $60,000, deductible when paid;
• tax paid during the year: $180,000; and
• no opening deferred tax balances.

Assume all future tax benefits are probable and ignore tax credits and tax losses.

Problem and analysis

The penalty is permanent. The depreciation difference is temporary because tax deductions exceed accounting depreciation in the current period. The environmental provision is also temporary because the accounting liability is recognised before the tax deduction.

Current tax calculation

Tax paid is $180,000, so current tax payable before other payments or credits is:

Deferred tax calculation

The machine’s carrying amount is higher or lower than its tax base according to the cumulative depreciation history. For the current-year difference alone, tax depreciation exceeds accounting depreciation by $60,000, which normally reduces an existing taxable temporary difference or creates a deductible temporary difference depending on opening balances. Since opening balances are stated to be zero, the simplified year-end analysis assumes the machine’s carrying amount is $60,000 lower than its tax base relative to the tax adjustment, producing a DTA of $18,000.

The environmental provision creates a DTA:

Total illustrative DTA is therefore $36,000, subject to confirming the asset’s complete tax history and the recognition requirements. The penalty creates no deferred tax because it will never be deductible.

Outcome and learning points

Meridian reports current tax expense of $246,000 before considering any prior-period adjustments. It recognises current tax payable of $66,000 after the payment made. The deferred tax movement is presented according to the location of the underlying transactions. The case demonstrates why a tax reconciliation alone is insufficient: current tax explains the present liability, while temporary-difference analysis explains future tax consequences.

10. Professional judgement, governance and ethics

Corporate tax reporting involves significant judgement. Weak controls can result in misstated tax expense, understated liabilities or unsupported DTAs. Important controls include:

• maintaining a temporary-difference schedule by asset and liability;
• documenting the tax base and expected reversal pattern;
• reconciling tax computations to the general ledger;
• obtaining evidence for DTA recoverability forecasts;
• monitoring changes in enacted and substantively enacted tax law;
• reviewing uncertain tax positions with qualified advisers; and
• independently reviewing significant estimates and disclosures.

Ethically, tax planning should be distinguished from tax evasion. Evasion involves deliberate non-compliance and misrepresentation. Aggressive arrangements may comply technically with isolated rules while defeating their purpose and creating substantial reputational, regulatory and financial risk. Directors and accountants should consider both legal compliance and the quality, transparency and faithful representation of financial reporting.

Tax disclosures should allow users to understand the relationship between accounting profit, tax expense, tax payments and future tax effects. Artificially optimistic forecasts used solely to recognise DTAs, or unexplained changes in the ETR, undermine trust and may indicate governance weaknesses.

11. Technology and contemporary practice

Tax provision software and enterprise-resource-planning systems can automate data collection, depreciation comparisons and reconciliation schedules. Analytical tools may identify unusual movements in tax rates or temporary differences. Artificial intelligence can assist with document classification and tax-law research, but it cannot replace professional judgement. Outputs must be validated for:

• correct jurisdiction and tax period;
• current legislation;
• completeness of source data;
• correct treatment of exceptions; and
• confidentiality and access controls.

The continuing international focus on minimum taxation, transfer pricing, cross-border reporting and tax transparency makes the separation of accounting requirements from tax-law requirements increasingly important. Practitioners should use current authoritative guidance because rates, reliefs and recognition rules change.

Best-practice checklist

Before finalising a corporate tax provision, the accountant should:

1. determine accounting profit before tax;
2. prepare and document the current-tax reconciliation;
3. identify every material temporary difference;
4. determine the tax base of each relevant asset and liability;
5. apply the enacted or substantively enacted reversal rate;
6. assess DTA recoverability using objective evidence;
7. allocate tax effects to profit or loss, other comprehensive income or equity as required;
8. reconcile opening and closing tax balances;
9. explain the ETR and material changes; and
10. review disclosures, legal compliance and management estimates.

Chapter Summary

Corporate income tax accounting distinguishes current tax from deferred tax. Current tax is based on taxable profit under tax legislation, whereas deferred tax reflects future tax consequences of differences between financial-statement carrying amounts and tax bases. Permanent differences affect the ETR but do not reverse and do not create deferred tax. Temporary differences reverse and generally create deferred tax assets or liabilities.

The balance-sheet liability method requires accountants to identify carrying amounts, tax bases, expected reversal rates and the location of the underlying transaction. DTLs arise mainly from taxable temporary differences; DTAs arise from deductible temporary differences, unused losses and credits, but only when future utilisation is probable. Effective tax-rate reconciliations explain why total tax expense differs from the statutory-rate charge. Accurate reporting depends on sound schedules, evidence-based judgement, current legal knowledge, ethical conduct and effective governance.

Key Terms

Accounting profit: Profit or loss before tax measured under accounting standards.

Taxable profit: Profit determined under tax legislation for calculating current tax.

Current tax: Tax payable or recoverable for the current or prior periods.

Deferred tax: Tax arising from temporary differences and unused losses or credits.

Tax base: Amount attributed to an asset or liability for tax purposes.

Carrying amount: Amount recognised for an asset or liability in the financial statements.

Temporary difference: Difference between carrying amount and tax base that reverses in the future.

Permanent difference: Difference that does not reverse in future periods.

Deferred tax liability: Future tax payable arising from taxable temporary differences.

Deferred tax asset: Future tax benefit arising from deductible temporary differences, losses or credits.

Taxable temporary difference: Difference expected to produce taxable amounts on recovery or settlement.

Deductible temporary difference: Difference expected to produce future tax deductions.

Statutory tax rate: Tax rate prescribed by applicable law.

Effective tax rate: Total income tax expense divided by accounting profit before tax.

Tax reconciliation: Schedule explaining the relationship between accounting profit and taxable profit or tax expense.

Tax depreciation: Depreciation deduction permitted by tax legislation.

Recoverability: Probability that a deferred tax asset can be used against future taxable profit.

Substantively enacted: Tax law sufficiently approved so that its future application is effectively certain under the reporting framework.

Tax planning opportunity: A lawful action that creates or increases taxable profit available to use tax losses or credits.

Review Questions

Short Answer Questions

1. Distinguish accounting profit from taxable profit.
2. What is the difference between a permanent difference and a temporary difference?
3. Define the tax base of an asset.
4. When may a deferred tax asset be recognised?
5. What does the effective tax rate measure?

Long Answer Questions

1. Explain the balance-sheet liability method for accounting for deferred tax.
2. Discuss the principal sources of deferred tax liabilities and deferred tax assets.
3. Explain how current tax is calculated from accounting profit before tax.
4. Describe the presentation and disclosure issues associated with income tax.
5. Discuss the ethical and governance risks in recognising deferred tax assets.

Analytical / Application Questions

1. A company reports accounting profit of $600,000. It has non-deductible expenses of $25,000, accounting depreciation of $100,000 and tax depreciation of $140,000. Calculate taxable profit and current tax at 25%, assuming no other adjustments.
2. An asset has a carrying amount of $500,000 and a tax base of $440,000. Calculate the deferred tax balance at 30% and explain whether it is an asset or liability.
3. A company has a $90,000 tax loss carry-forward but has reported losses for three consecutive years and has no convincing forecast of future taxable profit. Analyse whether a deferred tax asset should be recognised and identify evidence that could change the conclusion.

Multiple Choice Questions with Answers

Question 1

Which amount is determined under tax legislation and used to calculate current tax?

A. Accounting profit

B. Taxable profit

C. Comprehensive income

D. Retained earnings

Correct Answer: B. Taxable profit

Question 2

A permanent difference generally has which effect?

A. It creates a deferred tax liability

B. It creates a deferred tax asset

C. It affects the effective tax rate but does not reverse

D. It is ignored in both accounting and tax

Correct Answer: C. It affects the effective tax rate but does not reverse

Question 3

An asset has a carrying amount of $200,000 and a tax base of $160,000. At a tax rate of 25%, what deferred tax balance normally arises?

A. A $10,000 deferred tax asset

B. A $10,000 deferred tax liability

C. A $40,000 deferred tax liability

D. No deferred tax balance

Correct Answer: B. A $10,000 deferred tax liability

Question 4

A warranty provision is recognised in accounting but is deductible only when paid. What does it normally create?

A. A deductible temporary difference

B. A permanent difference

C. A taxable temporary difference only

D. An immediate tax refund

Correct Answer: A. A deductible temporary difference

Question 5

What is the basic formula for current tax when one tax rate applies?

A. Accounting profit × tax rate

B. Taxable profit × tax rate

C. Carrying amount × tax rate

D. Tax base ÷ tax rate

Correct Answer: B. Taxable profit × tax rate

Question 6

A company has taxable profit of $300,000 and a tax rate of 30%. Ignoring credits and prior-period adjustments, current tax is:

A. $90,000

B. $100,000

C. $210,000

D. $300,030

Correct Answer: A. $90,000

Question 7

A deferred tax asset for unused tax losses is recognised only to the extent that:

A. The losses are large enough

B. Future taxable profit is probable

C. Accounting profit is always positive

D. The tax authority guarantees utilisation

Correct Answer: B. Future taxable profit is probable

Question 8

The effective tax rate is calculated as:

A. Current tax payable ÷ cash balance

B. Taxable profit ÷ accounting profit

C. Income tax expense ÷ accounting profit before tax

D. Deferred tax ÷ tax base

Correct Answer: C. Income tax expense ÷ accounting profit before tax

Question 9

If tax depreciation exceeds accounting depreciation in the current period, the difference is generally:

A. A temporary difference requiring further analysis

B. Always a permanent difference

C. Never relevant to deferred tax

D. Automatically an income tax refund

Correct Answer: A. A temporary difference requiring further analysis

Question 10

Tax relating to a transaction recognised in other comprehensive income should generally be:

A. Recognised only as current tax payable

B. Allocated consistently to other comprehensive income

C. Ignored until the asset is sold

D. Recognised directly in revenue

Correct Answer: B. Allocated consistently to other comprehensive income