Important Deadlines for Filing 2018 Business Returns

Partnership Tax Deadlines: Due Date:
Original tax deadline for partnerships (Form 1065) March 15, 2019
Extension tax deadline for partnerships (Form 1065) September 16, 2019
S Corporation Tax Deadlines: Due Date:
Original tax deadline for S Corporations (Form 1120S) March 15, 2019
Extension tax deadline for S Corporations (Form 1120S) September 16, 2019
C Corporation Tax Deadlines: Due Date:
Original tax deadline for C Corporations (Form 1120) April 15, 2019
Extension tax deadline for C Corporations (Form 1120) October 15, 2019
Sole Proprietor Tax Deadlines: Due Date:
Original tax deadline for sole proprietors and individuals (Form 1040) April 15, 2019
Extension tax deadline for sole proprietors and individuals (Form 1040) October 15, 2019
Nonprofit Tax Deadlines: Due Date:
Original tax deadline for exempt organizations (Form 990) May 15, 2019
Extension tax deadline for exempt organizations (Form 990) August 15, 2019