- the 12 months of February 1 through January 31
- the 12 months of October 1 through September 30
- the 12 months of June 1 through May 31
- the 52 weeks (four 13-week quarters) ending on the Saturday closest to January 31 (This will require an occasional fiscal year of 53 weeks since 52 weeks X 7 days = 364 days vs. 365 days per year.)
One reason a business or other organization will have its accounting year end on a date other than December 31 is to fit its natural business year. For example, school districts will use fiscal years of July 1 through June 30. Retailers often end their fiscal years near the end of January.
A corporation or other organization needing audited financial statements will likely save auditing fees by having its accounting year different from the calendar year end of December 31.