Changes in Accounting Estimate
APB Opinion No. 20

10 Change in Accounting Estimate--are consequences of periodic presentations of financial statements. 

Result from estimating future events whose effects cannot be perceived with certainty; estimating requires the exercise of judgment.

31 Reporting a Change in Accounting Estimate--Accounted for in (a) the period of change if the change affects only that period or (b) the period of change and future periods if the change affects both.

Prior periods not restated and pro forma amounts not reported.

33 Disclosure--effect on income before extraordinary items, net income and per share amounts of the current period should be disclosed for a change in estimate that affects several future periods.
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