Deferred Tax Valuation Allowance Model (ASC 740 / IAS 12)

Identical deferred tax assets, identical projected income, and a completely different valuation allowance conclusion, purely because one company has cumulative losses and the other doesn't. This is the exact judgment ASC 740 forces every year.

How To Use This Model

Reading This Tool

Enter your deferred tax asset sources, deferred tax liabilities, projected future income, and whether cumulative losses exist.

The tool applies the four-sources-of-income framework in order, DTL reversals first, then future income, showing exactly how much valuation allowance results, and why the cumulative loss flag changes everything.

Deferred Tax Balances & Evidence

NOL Carryforward Deferred Tax Asset $2,000,000

Other Deductible Temporary Difference DTA $1,000,000

Taxable Temporary Difference DTL $1,500,000

Projected Cumulative Future Taxable Income $5,000,000

Applicable Tax Rate 25.0%

Cumulative Losses In Recent 3 Years?

A cumulative loss position is treated in practice as significant objective negative evidence that is very difficult to overcome with subjective projections of future income alone.

Valuation Allowance Conclusion

Required Valuation Allowance

Total Gross DTA

Net DTA After Valuation Allowance

DTA Realizability By Source Of Income

Income Tax Accounting Judgment

The Four Sources Of Taxable Income (In Order Of Reliability)

1. Future reversals of existing taxable temporary differences (DTL)
2. Future taxable income exclusive of reversing differences and carryforwards
3. Taxable income in prior carryback years, if carryback is permitted
4. Tax planning strategies
VA = Total DTA − (portion supported by objectively verifiable sources)

Source 1 (DTL reversal) is the most reliable since it requires no forecast at all, the temporary difference is already on the books and will mechanically reverse. Sources 2 through 4 require increasingly more subjective judgment, and are given correspondingly less weight, especially when a cumulative loss position exists.

When To Actually Use This Model

Assessing whether a valuation allowance is required against deferred tax assets at year-end for financial reporting purposes.
Teaching ASC 740 realizability judgment and the weighting of positive versus negative evidence in an advanced tax accounting course.
Explaining to a board or audit committee why a large NOL deferred tax asset might still require a full valuation allowance.
Modeling how a return to profitability would change a prior valuation allowance conclusion.

Key Assumptions & Limitations

This model simplifies DTL "support" to a dollar-for-dollar match; real assessments require the DTL to reverse in the same jurisdiction and character (capital vs. ordinary) as the DTA.
The cumulative loss test here is binary; real assessments weigh the specific magnitude, duration, and cause of losses alongside other evidence.
Tax planning strategies (source 4) are not separately modeled, they require actions a company can and would actually take, not merely hypothetical ones.
NOL and credit carryforward expiration limits are not modeled, some jurisdictions limit how many years a carryforward can be used.

Foundational Reference

Financial Accounting Standards Board. FASB Accounting Standards Codification, Topic 740, Income Taxes.

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