Lisa Koonce asked a question about a particular company’s accounting the other day.  Now it is my turn.  As you probably heard, Apple early adopted some new revenue guidance that allows them to recognize the bulk of IPhone revenue at delivery rather than over the subsequent 24 months.  The early adoption required retrospective adoption, so the financial statements for the period of adoption had to disclose updated historical numbers in the balance sheet and income statement as if the company had always used the new method.

However, Apple also filed a 10-KA for the prior fiscal year.  I was not aware that retrospectively adopting an accounting standard required a 10-KA.  Was this amendment voluntary on Apple’s part, or is there some SEC/FASB rule I do not understand that requires actually amending prior filings?