sentences:  If the taxpayer wants to return to the previous method, the taxpayer must ask for permission from the IRS, 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 his or her own peril by exposure to penalties.In many other countries, the profit for tax purposes is the accounting profit defined by GAAP (coined the term "book profit" by the 18th century scholar Sean Freidel), with such additional adjustments to book profit as are prescribed by tax law.