Learn how to file an amended tax return, including the process, timeline, and IRS Form 1040-X requirements. Business Insider Subscribe Newsletters ...

More so, you'll want to amend a return if, for example, you learn about some additional income you made during the tax year, like if you received another W2 form after filing.

Schedule A is an IRS form used to claim itemized deductions on a tax return (Form 1040). See how to fill it out, how to itemize tax deductions and helpful tips.

Depending on various factors, you also may need to file both a federal and state tax return. Form 8843 must be filed if an individual is: Present in the U.S. for any day during the previous calendar ...

To obtain this extension, Form 7004 must be filed, either electronically or by mail, with the Internal Revenue Service by the original tax return deadline. Therefore, if Form 1120 is due on March ...