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2019 Tax 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

2018 Estimated Tax Payment Due Dates (Calendar Year):

Quarterly Deadline: Due Date:
First Quarter Tax Estimate Deadline April 17, 2018
Second Quarter Tax Estimate Deadline June 15, 2018
Third Quarter Tax Estimate Deadline September 17, 2018
Fourth Quarter Tax Estimate Deadline (Corporations) December 17, 2018
Fourth Quarter Tax Estimate Deadline (Individuals) January 15, 2019

For more info from he IRS website click here.