Do I Need to File a Tax Return? Do you need to file a tax return? Find out with the IRS Interactive Tax Assistant. How Do I File a Deceased Person's Tax Return? Determine who must file a decedent’s individual tax return, how the tax return is notated, and the timeframe for filing the return. What Is the Simplest Form to Use to File My Taxes? Determine the simplest form to use to file your federal income tax return. What Is the Due Date of My Federal Tax Return or Am I Eligible to Request an Extension? Determine the due date of your federal tax return or whether you're eligible to request an extension. Should I File an Amended Return? Determine if you should file an amended return to correct an error or make other changes to your return.