As an individual taxpayer, you can file your tax return with IRS Form 1040, 1040A or 1040EZ, depending on your tax situation.
How do you know which form you should use?
You can always use Form 1040, regardless of whether you qualify to use Form 1040A or 1040EZ.
Forms 1040A and 1040EZ are just simplified, shorter versions of Form 1040. They are intended for people who have uncomplicated tax returns.