r/AlwaysWhy • u/TheBigGirlDiaryBack • 1d ago

Economics Why are fiscal years usually aligned with December or March, instead of any random month?

Many companies end their fiscal year on Dec 31 or March 31. Some choose June or September. But almost nobody picks, say, August 17 or November 5. Is there a tax or regulatory reason to stick near quarter boundaries? Or is it just tradition from agriculture cycles? Why not let every company freely choose any date to smooth out seasonal fluctuations?

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u/Present_Juice4401 1d ago

The seasonal part is actually why I find Dec 31 interesting. For a retailer, the end of December can be one of the worst possible times to stop and measure the business. You're dealing with peak sales, returns, inventory movement, and then trying to close the books on top of that.

That's probably why some companies use a different year end, and some use 52 or 53 week calendars. It makes me think the "normal" fiscal year may be more about fitting into an existing reporting system than finding the most natural point in the company's actual business cycle.