| Form IL-1000 | Pass-through Entity Payment Income Tax Return | 05/17/2012 |
| Form IL-1000-E | Certificate of Exemption for Pass-through Entity Payments | 12/23/2011 |
| Form IL-1000-P | Prepayment Voucher for Pass-through Entity Payments | 03/07/2012 |
| Form IL-1000-X | Amended Pass-through Entity Payment Income Tax Return | 03/07/2012 |
| Form IL-1023-C | Composite Income and Replacement Tax Return | 03/07/2012 |
| Form IL-1023-CES | 2012 Composite Estimated Tax Payments for Partners and Shareholders | 03/07/2012 |
| Form IL-1023-C-X | Amended Composite Income and Replacement Tax Return | 03/07/2012 |
| Form IL-1040 | Individual Income Tax Return | 03/20/2012 |
| Form IL-1040-ES | Estimated Income Tax Payments for Individuals | 03/06/2012 |
| Form IL-1040-V | Payment Voucher for Individual Income Tax | 12/22/2011 |
| Form IL-1040-X | Amended Individual Income Tax Return | 03/06/2012 |
| Form IL-1041 | Fiduciary Income and Replacement Tax Return | 03/07/2012 |
| Form IL-1041-X | Amended Fiduciary Income and Replacement Tax Return | 03/07/2012 |
| Form IL-1065 | Partnership Replacement Tax Return (includes Schedule B) | 03/07/2012 |
| Form IL-1065-X | Amended Partnership Replacement Tax Return | 03/07/2012 |
| Form IL-1120 | Corporation Income and Replacement Tax Return | 03/06/2012 |
| Form IL-1120-ES | 2012 Estimated Income and Replacement Tax Payments for Corporations | 03/07/2012 |
| Form IL-1120-ST | Small Business Corporation Replacement Tax Return (includes Schedule B) | 03/07/2012 |
| Form IL-1120-ST-X | Amended Small Business Corporation Replacement Tax Return | 03/07/2012 |
| Form IL-1120-X | Amended Corporation Income and Replacement Tax Return | 03/07/2012 |
| Form IL-1310 | Statement of Person Claiming Refund Due a Deceased Taxpayer | 03/06/2012 |
| Form IL-2210 | Computation of Penalties for Individuals | 03/06/2012 |
| Form IL-2220 | Computation of Penalties for Businesses | 03/07/2012 |
| Form IL-4562 | Special Depreciation | 03/07/2012 |
| Form IL-4644 | Gains from Sales of Employer's Securities Received from a Qualified Employee Benefit Plan and Instructions | 03/06/2012 |
| Form IL-477 | Replacement Tax Investment Credits | 03/07/2012 |
| Form IL-4852 | Substitute for Unobtainable Form W-2 | 03/06/2012 |
| Form IL-501 | Payment Coupon and Instructions | 01/07/2011 |
| Form IL-505-B | Automatic Extension Payment | 03/07/2012 |
| Form IL-505-I | Automatic Extension Payment for Individuals | 03/06/2012 |
| Form IL-56 | Notice of Fiduciary Relationship | 12/23/2011 |
| Form IL-5754 | Statement by Person Receiving Gambling Winnings | 10/17/2011 |
| Form IL-8453 | Individual Income Tax Electronic Filing Declaration | 12/05/2011 |
| Form IL-8633-I | Application to File Individual Income Tax Returns Electronicall | 12/17/2010 |
| Form IL-941 | Illinois Withholding Income Tax Return and Instructions | 12/16/2010 |
| Form IL-941-X | Amended Illinois Withholding Tax Return | 12/23/2010 |
| Form IL-990-T | Exempt Organization Income and Replacement Tax Return | 03/07/2012 |
| Form IL-990-T-X | Amended Exempt Organization Income and Replacement Tax Return | 03/07/2012 |
| Form IL-W-4 | Employee's Illinois Withholding Allowance Certificate | 05/30/2012 |
| Form IL-W-5 | Certificate of Residence in Illinois | 10/17/2011 |
| Form IL-W-5-NR | Employee's Statement of Nonresidence in Illinois | 10/17/2011 |
| Form Sch. 1299-B | Enterprise Zone or Foreign Trade Zone (sub-zone) Subtractions (for corporations and fiduciaries) | 03/07/2012 |
| Form Sch. 1299-C | Income Tax Subtractions and Credits | 03/06/2012 |
| Form Sch. 1299-D | Income Tax Credits (for corporations and fiduciaries) | 03/07/2012 |
| Form Sch. 1299-S | Enterprise Zones, Foreign Trade Zones, and Sub-Zones | 01/11/2012 |
| Form Sch. 4255 | Recapture of Investment Tax Credits | 08/15/2012 |
| Form Sch. 80/20 | Related Party Expenses | 12/23/2011 |
| Form Sch. CR | Credit for Tax Paid to Other States | 12/22/2011 |
| Form Sch. F | Gains from Sales or Exchanges of Property Acquired | 12/22/2011 |
| Form Sch. G | Voluntary Charitable Donations | 12/22/2011 |
| Form Sch. I | Income Received | 03/07/2012 |
| Form Sch. ICR | Illinois Credits | 12/22/2011 |
| Form Sch. INL | Illinois Net Loss Adjustment for Cooperatives | 12/23/2011 |
| Form Sch. INS | Tax for Foreign Insurers | 12/23/2011 |
| Form Sch. J | Foreign Dividends | 12/23/2011 |
| Form Sch. K-1-T | Beneficiary's Share of Income and Deductions | 12/23/2011 |
| Form Sch. K-1-T (1) | Instructions for Trusts and Estates Completing Schedule K-1-T | 03/07/2012 |
| Form Sch. K-1-T (2) | Beneficiary's Instructions | 09/15/2011 |
| Form Sch. M (1040) | Other Additions and Subtractions for Individuals | 12/22/2011 |
| Form Sch. M (1120) | Other Additions and Subtractions (for businesses) | 03/07/2012 |
| Form Sch. NB | Nonbusiness Income | 12/23/2011 |
| Form Sch. NLD | Illinois Net Loss Deduction | 12/23/2011 |
| Form Sch. NR | Nonresident and Part-year resident Computation of Illinois Tax | 12/22/2011 |
| Form Sch. UB | Combined Apportionment for Unitary Business Group | 12/23/2011 |
| Form Sch. UB/INS | Tax for a Unitary Business Group with Foreign Insurer Members | 12/23/2011 |
| Form Sch. UB/NLD | Unitary Illinois Net Loss Deduction | 12/23/2011 |
| Form UI-WIT-X | Amended Illinois Income Tax Withholding Return for Household Employers | 12/16/2010 |
