17 Last estimated payment for 2011 is due. Payroll taxes via EFTPS are due. 31 Furnish forms 1099 and W-2 to your subcontractors and employees by today. Quarterly reports for IRS, CDOR and CDOL are due today.
29 File W-3 and forms W-2 with the IRS.
15 Form 1120 due for corporations. Form 1120S due for S-Corporations. Form 2553 to elect S-Corp status for 2012 is due by today. Last day to file extensions for C and S corporations.
17 Form 1040 due for individuals. Form 1065 due for partnerships. Last day to file extensions for individuals and partnerships.