
| 12/15 | Corporate Income/Franchise Fourth installment of the current year estimated tax by corporations (use Form 1120-W to determine estimated tax liability). |
| 12/21 | Sales & Use Monthly filers required to file Form 01-114/01-117 for sales and use tax collected in November. |
| 12/15 | Individual Fourth (last) estimated tax payment for 2009 (Form 1040-ES) due. |
| 1/15 | Individual Final installment of prior year estimated tax by individuals, unless income tax return is filed and tax paid in full by the last day of first month of next succeeding year. |
| 1/20 | Sales & Use Monthly filers required to file Form 01-114/01-117 for sales and use tax collected in December 2009. |

