If you are a citizen or resident of the United States, and your gross income for the tax year is at least the amount shown for your status under Filing Requirements, later, you must file a 2000 federal income tax return. This is true even if no tax is due.
Gross income is explained later.
If you do not meet the gross income requirement, you may still need to file a tax return if any of the following apply. You have self-employment income. You are entitled to certain credits. You are entitled to a complete refund of tax withheld. This chapter also includes information about various forms and returns you may need to file.