All domestic entities elected to be taxed as a corporation must file form 1120 for every tax year regardless of their taxable income. The due date to file U.S. Income Tax Return for C-corporation (Form 1120) with the calendar year is April 15, 2021. If a business is not able to file their return on time can file a tax extension form 7004 which gives an automatic 6-month extension up to October 15, 2021.
U.S. Income Tax Return for C corporation (Form 1120) with fiscal tax years ending June 30 is due by the 15th day of the 3rd month after the end of the entity’s tax year, that is September 15, 2021. By filing form 7004, C corporations with tax years ending June 30 are eligible for an automatic extension period of seven months
When you choose to file a tax extension for C Corp with ExpressExtension, choose the Business Entity Type as 'Corporation' and the Form Type as 'Form 1120- US Corporate Income Tax Return'.
For step-by-step instructions on e-filing Form 7004, click here.