Due Date
The due date for the 2025 Missouri Individual Income Tax Return is April 15, 2026 .
The extension due date for the 2025 Missouri Individual Income Tax Return is October 15, 2026 .
The Ethanol Retailer and Distributor Tax Credit, Biodiesel Retailer and Distributor Tax Credit, Food Pantry Tax Credit, and Champion for Children Tax Credit are all due April 15, 2026 .