The due date for filing a form can vary based on the type of form and the individual or entity required to file it. The specific due dates for each form are outlined by the relevant tax authority or government agency. For individuals in the United States, the due date for filing federal income tax returns (Form 1040) is typically April 15th of each year. However, this date may be extended if the 15th falls on a weekend or holiday. For businesses, the due date for filing various forms, such as Form 1120 for corporations or Form 1065 for partnerships, can vary. Generally, these forms are due on the 15th day of the third month following the end of the tax year (e.g., March 15th for calendar year filers). It is important to consult the specific instructions for each form or seek advice from a tax professional or accountant to determine the correct due date for filing.