Income Tax Provision Walkthrough: ASC 740 for the CPA Exam

Income Tax Accounting Overview

ASC 740 governs the accounting for income taxes, one of the most complex and heavily tested topics on the CPA FAR exam. The objective is to recognize the amount of taxes payable or refundable for the current year (current tax) and the deferred tax consequences of events recognized in the financial statements (deferred tax). The interplay between book income and taxable income creates temporary and permanent differences that drive the entire tax provision.

Temporary vs. Permanent Differences

Temporary Differences

Temporary differences arise when the tax basis of an asset or liability differs from its book carrying amount, and the difference will reverse in future periods. Temporary differences create deferred tax assets (DTAs) or deferred tax liabilities (DTLs).

Common examples that create DTLs (book income exceeds taxable income now, more tax later):

Accelerated depreciation for tax, straight-line for book
Installment sale revenue recognized for book but deferred for tax
Prepaid expenses deducted for tax when paid but expensed for book when incurred

Common examples that create DTAs (taxable income exceeds book income now, less tax later):

Warranty expense accrued for book but deducted for tax when paid
Bad debt expense estimated for book under CECL but deducted for tax when written off
Unearned revenue taxed when received but recognized for book when earned
Net operating loss carryforwards

Permanent Differences

Permanent differences are items that affect book income or taxable income but never reverse. They do not create deferred taxes. Examples include tax-exempt municipal bond interest, nondeductible fines and penalties, meals and entertainment deductions limited by tax law, and life insurance premiums on officers where the company is the beneficiary.

Step-by-Step Tax Provision Example

Given: A company has pretax book income of $500,000 for Year 1. The tax rate is 21%. The following differences exist:

Depreciation: Book depreciation is $40,000; tax depreciation is $70,000 (temporary difference: $30,000).
Warranty expense: Book accrual is $15,000; tax deduction (cash payments) is $5,000 (temporary difference: $10,000).
Municipal bond interest income: $8,000 (permanent difference, tax-exempt).
Nondeductible fines: $3,000 (permanent difference).

Step 1: Calculate Taxable Income

Start with pretax book income and adjust:

Pretax book income: $500,000
Add back excess book depreciation over tax: actually tax depreciation is higher, so subtract the $30,000 difference
Add back warranty accrual not yet deductible: +$10,000
Subtract tax-exempt interest: -$8,000
Add back nondeductible fines: +$3,000
Taxable income: $500,000 - $30,000 + $10,000 - $8,000 + $3,000 = $475,000

Step 2: Calculate Current Tax Expense

Current tax payable: $475,000 x 21% = $99,750.

Step 3: Calculate Deferred Taxes

Depreciation difference ($30,000): Tax basis of the asset is lower than book basis, creating a DTL. DTL: $30,000 x 21% = $6,300.
Warranty difference ($10,000): Tax basis of the warranty liability is higher (future deduction available), creating a DTA. DTA: $10,000 x 21% = $2,100.

Step 4: Record the Tax Provision

Debit: Income Tax Expense $103,950 (total: current $99,750 + net deferred $4,200)
Credit: Income Taxes Payable $99,750
Credit: Deferred Tax Liability $6,300
Debit: Deferred Tax Asset $2,100

Verification: Total tax expense = $99,750 + $6,300 - $2,100 = $103,950. Effective tax rate: $103,950 / $500,000 = 20.79%. This differs from the statutory 21% because of the permanent differences (tax-exempt interest lowers the rate, nondeductible fines raise it).

Valuation Allowance

A valuation allowance is established for DTAs when it is more likely than not (greater than 50%) that some or all of the DTA will not be realized. Positive evidence supporting realization includes existing taxable temporary differences that will reverse, projected future taxable income, tax planning strategies, and a history of profitability. Negative evidence includes cumulative losses in recent years, a history of unused carryforwards, and expected future losses.

Example

A company has a DTA of $50,000 from NOL carryforwards. It has cumulative losses in the most recent three years and no taxable temporary differences to offset. Management concludes it is more likely than not that only $20,000 of the DTA will be realized. The valuation allowance is $30,000.

Debit: Income Tax Expense $30,000
Credit: Valuation Allowance $30,000

The DTA is reported net: $50,000 gross DTA minus $30,000 valuation allowance = $20,000 net DTA on the balance sheet.

Rate Reconciliation

Companies must disclose a reconciliation of the statutory tax rate to the effective tax rate. Using our example: statutory rate 21% applied to $500,000 = $105,000. Permanent adjustments: tax-exempt interest saves $8,000 x 21% = $1,680; nondeductible fines cost $3,000 x 21% = $630. Effective tax: $105,000 - $1,680 + $630 = $103,950. Effective rate: 20.79%.

Key Exam Tips

Temporary differences create DTAs or DTLs; permanent differences do not.
DTLs arise when book carrying amount exceeds tax basis (future taxable amounts); DTAs arise when tax basis exceeds book carrying amount (future deductible amounts).
The valuation allowance reduces DTAs when realization is not more likely than not.
Changes in tax rates require remeasurement of all DTAs and DTLs at the new enacted rate, with the adjustment recognized in income tax expense.
Master the step-by-step provision calculation: book income to taxable income, current tax, deferred tax, total expense.