| Form 1CNS | Composite Wisconsin Individual Income Tax Return for Nonresident Tax-Option (S) Corporation Shareholders | Fill-In Form | Instructions |
| Form 4 | Corporation Franchise or Income Tax Return | Fill-In Form | Instructions |
| Form 4B | Apportionment Data | Fill-In Form |
| Form 4B-1 | Apportionment Data For Specialized Industries | Fill-In Form | Instructions |
| Form 4BL | Net Business Loss Carryforward and Instructions | Fill-In Form |
| Form 4C | Separate Accounting Data | Fill-In Form | Instructions |
Form 4-ES
No Longer Available | Estimated Tax Voucher | Fill-In Form | Instructions |
| Form 4H | Corporation Declaration of Inactivity and Instructions | Fill-In Form |
| Form 4I | Insurance Company Franchise Tax Return | Fill-In Form | Instructions |
| Form 4T | Exempt Organization Business Franchise or Income Tax Return | Fill-In Form | Instructions |
| Form 4U | Underpayment of Estimated Tax by Corporations and Instructions | Fill-In Form |
| Form 4466W | Corporation or Pass-Through Entity Application for Quick Refund of Overpayment of Estimated Tax and Instructions |
| Form 5 | Corporation Franchise or Income Tax Return | Fill-In Form | Instructions |
| Form 5E | Election by an S Corporation Not to Be Treated as a Tax-Option Corporation and Instructions | Fill-In Form |
| Form 5R | Revocation of Election by an S Corporation Not to Be a Tax-Option Corporation and Instructions | Fill-In Form |
| Form 5S | Tax-Option (S) Corporation Franchise or Income Tax Return | Fill-In Form | Instructions |
| Form 8 | Transfers of Capital Stock and Instructions | Fill-In Form |
| Form 830 | Application for Extension of Time to File (Corporation Franchise or Income Tax Return) and Instructions |
| Form 9B | Miscellaneous Income and Instructions | Fill-In Form |
| Form A-222 | Power of Attorney and Instructions | Fill-In Form |
| Form CN-ES | Composite Estimated Tax Voucher discontinued because pass-through entities are now subject to withholding tax. Use Form PW-1 instead. |
| Form CU | Credit Union Declaration of Exempt Status |
| Form PW-1 | Nonresident Income or Franchise Tax Withholding on Pass-Through Entity Income | Instructions | Electronic Filing |
| Schedule 5K-1 | Tax-Option (S) Corporation Shareholder's Share of Income, Deductions, Credits, etc. | Fill-In Form | Instructions |
| Schedule CU-1 | Credit Union Net Income and Instructions | Fill-In Form |
| Schedule DC | Development Zones Credits | Fill-In Form | Instructions |
| Schedule DI | Dairy and Livestock Farm Investment Credit and Instructions | Fill-In Form |
| Schedule FC | Farmland Preservation Credit Claim | Fill-In Form | Instructions |
| Schedule FT | Farmland Tax Relief Credit and Instructions | Fill-In Form |
| Schedule HR | Historic Rehabilitation Credits and Instructions | Fill-In Form |
| Schedule MS | Manufacturer's Sales Tax Credit and Instruction | Fill-In Form | Instructions |
| Schedule R | Research Credits | Fill-In Form | Instructions |
| Schedule TC | Technology Zone Credit and Instructions | Fill-In Form |
| Schedule V | Additions to Federal Income | Fill-In Form |
| Schedule VC | Venture Capital Credits | Fill-In Form | Instructions |
| Schedule W | Subtractions from Federal Income | Fill-In Form |
| Schedule Y | Deductible Dividends | Fill-In Form |
| Schedule Z | Discontinued for 2006. Use Schedule MS |
| Schedule Z-1 | Discontinued for 2006. Use Schedule MS |