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Why do companies have a fiscal year different from the calendar year?
In addition to the company-specific annual business cycle reasons and company-specific historical reasons mentioned in the other answers, there is another reason. Accounting firms tend to be very busy during January (and February and March) when most companies are closing and auditing their calendar-year books.  If a company chooses its fiscal year to end at a different time of year, the accounting firms are more available, and the auditing costs might be lower.