Use the tables linked below to find the due date of returns that a tax-exempt organization must file. To use the tables, you must know when your organization’s tax year ends. Return Due Dates for Exempt Organizations: Annual Returns Return Due Dates for Exempt Organizations: Form 990-T Return Due Dates for Exempt Organizations: Excise Tax Returns (Forms 4720 and 6069) Return Due Dates for Exempt Organizations: Employment Tax Returns Return Due Dates: Other Returns and Reports Filed by Exempt Organizations Additional information Forms for exempt organizations