| Form 1CNS | Tax-option(s) corporations having two or more qualifying nonresident shareholders may file a composite return to report and pay the Wisconsin income tax owed by those shareholders.
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| Form 4 | Corporations (other than tax-option corporations) report under the non-combined or separate accounting methods.
| AR, 4BL, 4I, 4V, 4W, 4Y, 9b, A-01, A-02, A-03, A-04, A-05, A-06, A-07, A-08, A-09, A-10, A-11, BD, C, CF, CM, CR, CU, CU-1, DC, DE, EC, ED, EIT, ES, FC, FC-A, HR, HR-5, HR-T, JT, LI, MA-A, MA-M, MI, MS, N, R, RT, RT-1, U, VC, WQOF |
| Form 4466W | Wisconsin Corporation or Pass-Through Entity Application for Quick Refund of Overpayment of Estimated Tax.
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| Form 4H | Corporations that have been completely inactive in and outside Wisconsin for the entire taxable year and don't anticipate any activity in future years. No other return is required until a corporation is activated, reactivated, or requested to file by the Department of Revenue.
Note: Foreign corporations licensed to transact business in Wisconsin that have no property or activity in Wisconsin but are active outside Wisconsin may not file Form 4H. They must file Form 4 or 5S but need only check box F "No business transacted in Wisconsin" on the front of the return and attach a copy of their federal return
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| Form 4T | Exempt corporations and associations of individuals that have unrelated business taxable income as defined in Internal Revenue Code (IRC) section 512.
| AR, A-01, A-02, A-03, A-04, A-05, A-06, A-07, A-08, A-09, A-10, A-11, 9b, BD, CF, CM, CR, DC, DE, EC, ED, EIT, ES, FC, FC-A, HR, HR-5, HR-T, JT, LI, MA-A, MA-M, MI, MS, N, R, RT, RT-1, U, VC |
| Form 5E | Corporations that have elected and qualified to be S corporations for federal tax purposes but are electing not to be tax-option corporations for Wisconsin franchise or income tax purposes. In addition, such corporations must file Form 4 or 6.
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| Form 5R | Federal S corporations that elected not to be tax-option corporations for Wisconsin and subsequently are revoking their "opt-out" elections. In addition, such corporations must file Form 5S.
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| Form 5S | Tax-option (S) corporations | 1CNS, 5K-1, 5S-ET, 9b, AR, A-01, A-02, A-03, A-04, A-05, A-06, A-07, A-08, A-09, A-10, A-11, BD, CM, CORP-ES DC, DE, EC, ED, EIT, ES, ET-OS, HR, HR-5, HR-T, JT, LI, MA-A, MA-M, MI, MS, N, PW-1, PW-2, PW-ES, PW-U, R, RT, RT-1, U, VC |
| Form 6 | Wisconsin Combined Corporation Franchise or Income Tax Return | 6BL, 6CL, 6CS, 6I, 6Y, 9b, AR, A-01, A-02, A-03, A-04, A-05, A-06, A-07, A-08, A-09, A-10, A-11, BD, C, CF, CM, Corp-ES, CU, CU-1, DC, DE, EC, ED, EIT, ES, FC, FC-A, HR, HR-5, HR-T, JT, LI, MA-A, MA-M, MI, MS, N, R, RT, RT-1, U, VC, WQOF |
| Form Corp-ES | Wisconsin Corporation Estimated Tax Voucher | |
| Form CU | Credit unions that don't act as a public depository for state or local government funds. These credit unions are exempt from taxation by Wisconsin. Once a Form CU has been filed, no other return must be filed unless requested by the Department of Revenue or the credit union subsequently acts as a public depository. | |
| Form PW-1 | Tax-option(s) corporations having at least one nonresident shareholder whose share of distributable income allocable from the corporation is $1,000 or more. | PW-ES, PW-U |
| Form PW-2 | Nonresident shareholders use Form PW-2 to claim exemption from Wisconsin's withholding tax on income from pass-through entities. | |
| Form PW-ES | Wisconsin Pass-Through Entity Withholding Estimated Tax Voucher | |
| Form PW-U | Underpayment of Estimated Withholding Tax by Pass-Through Entities | |
| Form WR-A | Required attachment for E-filing and instructions | |