U.S. tax accounting refers to accounting for tax purposes in the United States. Unlike most countries, the United States has a comprehensive set of accounting principles for tax purposes, prescribed by tax law, which are separate and distinct from Generally Accepted Accounting Principles.

If the taxpayer wants to change their tax accounting method, section 446(e) requires the taxpayer to acquire the consent of the Secretary of the Treasury. There are two kinds of changes, one where you must receive a letter of approval from the Secretary of the Treasury. Another type of change comes from a series of more routine changes each of which is an automatic change. To get the automatic change the taxpayer must fill out a form and return it to the Secretary of the Treasury.

The taxpayer can adopt another method if the taxpayer files a tax return using that method for two consecutive years. This is different from changing a tax accounting method under the release of the Secretary of the Treasury because in the case of adopting another method the IRS may assess fines and reallocate taxable income. If the taxpayer wants to return to the previous method the taxpayer must ask for permission from the Secretary following the 446(e) procedure.

If the taxpayer fails to request a change of method of accounting then according to section 446(f) the taxpayer does so at their own peril by exposure to penalties.

In other countries, the profit for tax purposes is the accounting profit defined by GAAP (the "book profit"), with such additional adjustments to book profit as are prescribed by tax law. In other words, GAAP detemines the taxable profits except where a tax rule determines otherwise. Such adjustments typically include depreciation and expenses which for policy reasons are not deductible for tax purposes, such as entertaining costs and fines.

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