Individual Returns (IRS Form 1040):

April 18, 2023

Extended deadline is October 15, 2023.

Partnership Returns (IRS Form 1065):

March 15, 2023

Extended deadline is September 15, 2023.

Estates and Trusts Income Tax Returns (IRS Form 1041):

April 18, 2023

Extended deadline is September 30, 2023.

C-corporation Income Tax Returns (IRS Form 1120):

April 15, 2023 for C corporations that operate on a calendar year.

Extended deadline is October 15, 2023.

The deadline for C corp returns is the fourth month following the end of the corporation's fiscal year if the corporation is on a fiscal rather than a calendar year.

S-corporation Returns (IRS Form 1120-S):

March 15, 2023 for C corporations that operate on a calendar year.

Extended deadline is September 15, 2023.

The deadline for S corp and partnership returns is the 15th day of the third month following the end of the fiscal year if they are on a fiscal rather than a calendar year.

Estimated Tax Date for 2024

1st Q due April 18, 2024

2nd Q due June 15, 2024

3rd Q due September 15, 2024

4th Q due January 17, 2024