Tax Year

You must figure your income and file a tax return on the basis of an annual accounting period called a tax year. If you have not previously established a fiscal tax year, your tax year is the calendar year. A calendar year is 12 consecutive months ending on December 31. If you have previously established a regular fiscal year (12 consecutive months ending on the last day of a month other than December or a 52-53 week year) and are considered to be a U.S. resident for any calendar year, you will be treated as a U.S. resident for any part of your fiscal year that falls within that calendar year.