Deloitte
Accounting Research Tool
...
Chapter 3 — Book-Versus-Tax Differences and Tax Attributes

3.2 Permanent Differences

3.2 Permanent Differences

ASC 740-10
Basis Differences That Are Not Temporary Differences
25-30 Certain basis differences may not result in taxable or deductible amounts in future years when the related asset or liability for financial reporting is recovered or settled and, therefore, may not be temporary differences for which a deferred tax liability or asset is recognized. One example, depending on the provisions of the tax law, could be the excess of cash surrender value of life insurance over premiums paid. That excess is a temporary difference if the cash surrender value is expected to be recovered by surrendering the policy, but is not a temporary difference if the asset is expected to be recovered without tax consequence upon the death of the insured (if under provisions of the tax law there will be no taxable amount if the insurance policy is held until the death of the insured).
25-31 Tax-to-tax differences are not temporary differences. Recognition of a deferred tax asset for tax-to-tax differences is prohibited as tax-to-tax differences are not one of the exceptions identified in paragraph 740-10-25-3. An example of a tax-to-tax difference is an excess of the parent entity’s tax basis of the stock of an acquired entity over the tax basis of the net assets of the acquired entity.