In terms of knowing when extended taxes are due, it is crucial to keep track of specific deadlines for different tax entities. Individual taxpayers must submit their returns by October 15 if they filed for an extension. Partnerships and S-Corporations have a September 15 deadline, whereas C corporations likewise have until October 15. Remember, even with an extension, payments are still due by April 15 to avoid penalties . Comprehending these dates can help you avoid costly mistakes and guarantee compliance. Key Takeaways Extended tax returns for individuals are due on October 15, following the original April 15 deadline. Partnerships and S-Corps have an extended filing deadline of September 15. C corporations also extend their filing deadline to October 15. Always pay any taxes owed by the original due date to avoid penalties. Check for specific extensions if you are in a federally declared disaster area.…