= 856 --> A Moving to another question will save this response. Question 10 When must a partnership file its return? By the sur month after the original due date if an extension is filed. By the 15th day of the 3rd month after the partnership's tax year end. By the 15th day of the 4th month after the partnership's tax year end. By the sumonth after the original due date if an extension is filed and by the day of the month after the partner A Moving to another question will save this response