The IRS Form 1040 is one of the official U.S. documents that taxpayers can use to file their annual income tax return. The form is divided into sections for reporting income and deductions to determine the amount of tax you owe or the refund you can expect to receive.

You may need to file a Form 1040 if you claim certain credits or deductions. For example, if you itemize your deductions you'll need to fill out a 1040, as you cannot attach the Schedule A form needed for itemized deductions to either a 1040EZ or 1040A.

To access your Form 1040 online, check with your e-filing provider. You should be able to sign in and access a copy of your tax return (which includes the Form 1040—the main tax form—and any supporting forms).

The W-2 is different from your personal tax return. A W-2 is a report by your employer of your wages which you attach to your personal return. Your personal tax return is IRS Form 1040.