The 1040 Form is an IRS form that is used by individuals in order to fill out their annual income tax returns. There are various 1040 Forms available. These include the 1040A, 1040EZ and 1040X. Each of these 1040 Form variations is used for a different purpose. The standard 1040 form is used by a filer when he or she has adjustments, deductions and/or income beyond wages and interest (other sources of income).
There are two pages to the 1040 Form. One page is used to figure the income, as well as any adjustments to the income. The other page is used to record taxes due, deductions, credits, as well as payments that have already been made toward that persons tax liability.
You can amend a 1040 Form by filling out a 1040X form. The 1040X is used to report what changes you made to your 1040, as well as the the reasons for these changes. With the IRS you will need to be very clear as to the reasons for those changes.
As for the 1040EZ it is an alternative to the 1040 offering a faster and easier way to file. It is meant for taxpayers with simple tax situations. However the individual must have a taxable income of less than $100,000, interest income of $1,500 or less, and possess no dependents (as well as fulfill other requirements set by the IRS), in order to be eligible to use the 1040EZ form.