Important Income Tax Dates for California
January 18, 2011
- Fourth quarter estimated tax due for 2010
- State: 540-ES | Instructions
- Federal: 1040-ES (Instructions included)
March 15, 2011
- 2010 Corporation Income Tax returns due and tax due (for calendar year filers)
- State:
- 100 Booklet (Instructions included)
- 100S Booklet (Instructions included)
- Federal:
- 1120 | Instructions
- 1120S | Instructions
April 18, 2011
- 2010 Income Tax returns due and tax due
- State:
- 540/540A Booklet (Instructions included)
- 540 2EZ Booklet (Instructions included)
- 540NR Booklet (Instructions included)
- Federal:
- State:
- First quarter estimated tax due for 2011
- State: 540-ES | Instructions
- Federal: 1040-ES (Instructions included)
- 2010 Partnership and LLC Income Tax returns due and tax due (for calendar year filers)
- State:
- 565 Partnership Booklet (Instructions included)
- 568 Limited Liability Company Tax Booklet (Instructions included)
- Federal:
- 1065 | Instructions
- State:
- First quarter estimated tax due for 2011
- State:
- 540-ES | Instructions
- 100-ES | Instructions
- 3522 Limited Liability Company Tax Voucher (Instructions Included)
- Federal:
- 1040-ES (Instructions included)
- State:
June 15, 2011
- Second quarter estimated tax due for 2011
- State:
- 540-ES | Instructions
- 100-ES | Instructions
- 3536 Estimated Fee for LLCs (Instructions Included)
- Federal:
- 1040-ES (Instructions included)
September 15, 2011
- Third quarter estimated tax due for 2011
- State:
- Federal:
- 1040-ES (Instructions included)
October 17, 2011
- Extended due date for 2010 Income Tax returns
- State:
- 540/540A Booklet (Instructions included)
- 540 2EZ Booklet (Instructions included)
- 540NR Booklet (Instructions included)
- Federal:
- Extended due date for 2010 Corporation Income Tax returns (for calendar year filers)
- State:
- 100 Booklet (Instructions included)
- 100S Booklet (Instructions included)
- Federal:
- 1120 | Instructions
- 1120S | Instructions
- Extended due date for 2010 Partnership and LLC Income Tax returns (for calendar year filers)
- State:
- 565 Partnership Booklet (Instructions included)
- 568 Limited Liability Company Tax Booklet (Instructions Included)
- Federal:
- 1065 | Instructions
December 15, 2011
- Fourth quarter estimated tax due for 2011
- State:
- Federal:
Source: http://www.taxes.ca.gov/Income_Tax/Important_Dates/index.shtml
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