March 15th - Business return (S corporation, partnership and LLC) initial filing date and extension due date

April 15th - Individual, Trust and C corporation initial filing date and extension due date

April 15th - Q1 Estimated Taxes due (covering income and deductions through 3/31) and business CA minimum tax

June 15th - Q2 Estimated Taxes due (covering income and deductions through 5/31) and CA annual LLC fee, if applicable

September 15th - FINAL due date for business returns (S corporation, partnership and LLC); extended returns not filed by this date are subject to delinquency penalties

September 15th - Q3 Estimated Taxes due (covering income and deductions through 8/31)

September 30th - FINAL due date for trust returns; extended returns not filed by this date are subject to delinquency penalties

October 15th - FINAL due date for individual and C corporation returns; extended returns not filed by this date are subject to delinquency penalties

December 15th - Q4 Estimated Taxes due for business entities (S and C corporations)

January 15th - Q4 Estimated Taxes due for individuals & trusts (covering income and deductions through 12/31)