Business -- Which Form to File

  1. Which tax forms and schedules must a corporation file?
  2. What are the supplemental forms and schedules for corporations?
  3. Which tax forms and schedules must a partnership file?
  4. What are the supplemental forms and schedules for partnerships?
  5. Which tax forms and schedules must a sole proprietor file?
  6. What are the supplemental schedules for sole proprietors?

For additional information regarding forms specific to filing under combined reporting, go to revenue.wi.gov/combrept/forms.html

For additional information regarding forms that can/must be filed electronically, go to revenue.wi.gov/eserv/corp/forms.html


  1. Which tax forms and schedules must a corporation file?

    Form Name Description Possible Forms and Schedules
    Form 4 Corporations (other than tax-option corporations) reporting under the apportionment or separate accounting methods. 4A, 4A-1, 4A-2, 4BL, 4C, 4CL, 4CS, 4I, 4M, 4R, 4U, BC, CM, CR, CU-1, DC, DI, DM, EB, EC, ED, EM, FC, FC-A, FL, FP, FW, HI, HR, JC, JT, MI, MP, MS, PE, R, R-1, R-2, RB, RT, RT-1, TC, V, VC, VE, W, WB, WC, Y
    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, 5, or 5S but need only check box G "No business transacted in Wisconsin" on the front of the return and attach a copy of their federal return.
     
    Form 4T Exempt corporations and associations of individuals that have unrelated business taxable income as defined in Internal Revenue Code (IRC) section 512. 4A-1, 4A-2, 4C, 4U, BC, CM, CR, DC, DI, DM, EB, EC, ED, EM, FC, FC-A, FL, FP, FW, HR, JC, JT, MI, MP, MS, PE, R, R-1, R-2, RB, RT, RT-1, TC, VC, VE, WB, WC
    Form 5 Corporations (other than tax-option corporations) whose entire business income is attributable to Wisconsin. 4BL, 4U, BC, CM, CR, DC, DI, DM, EB, EC, ED, EM, FC, FC-A, FL, FP, FW, HI, HR, JC, JT, MI, MP, MS, PE, R, R-1, R-2, RB, RT, RT-1, TC, V, VC, VE, W, WB, WC, Y
    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 5.  
    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.  
    Form 5S Tax-option (S) corporations. 1CNS, 4A-1, 4A-2, 4U, 5K-1, BC, CM, DC, DI, DM, EB, EC, ED, EM, FL, FP, FW, HI, HR, JC, JT, MI, MP, MS, PE, PW-1, PW-2, PW-ES, PW-U, RB, RT, RT-1, TC, VC, VE, WB, WC
    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 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.  
    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-U
    Form PW-2 Nonresident shareholders use Form PW-2 to claim exemption from Wisconsin's withholding tax on income from pass-through entities.  

  2. What are the supplemental forms and schedules for corporations?

    Form Name Description
    Form 4A Multistate corporations using apportionment method to compute Wisconsin income. Used by combined filers only.
    Form 4A-1 Multistate corporations using a single factor apportionment method to compute Wisconsin income.
    Form 4A-2 Multistate corporations using a multiple factor apportionment method to compute Wisconsin income.
    Form 4BL Corporations claiming a net business loss carryforward.
    Form 4C Multistate corporations using the separate accounting method to compute Wisconsin income.
    Form 4U Corporations computing underpayment interest, extension interest, delinquent interest, penalties, and late filing fees.
    Schedule 5K-1 Tax-option (S) corporation shareholder's share of income, deductions, credits, etc.
    Schedule BC Corporations claiming a biodiesel fuel production credit.
    Schedule CM Corporations claiming a community rehabilitation credit.
    Schedule CR Wisconsin credit summary schedule.
    Schedule CU-1 Credit unions that act as a public depository.
    Schedule DC Corporations claiming a development zone credit.
    Schedule DI Corporations claiming a dairy and livestock farm investment credit.
    Schedule DM Corporations claiming a dairy manufacturing facility investment credit.
    Schedule EB Corporations claiming an ethanol and biodiesel fuel pump credit.
    Schedule EC Corporations claiming an enterprise zone jobs credit.
    Schedule ED Corporations claiming an economic development tax credit.
    Schedule EM Corporations claiming an electronic medical records credit.
    Schedule FC Corporations claiming a farmland preservation credit.
    Schedule FC-A Corporations claiming a farmland preservation credit.
    Schedule FL Corporations claiming a beginning farmer and farm asset owner credit.
    Schedule FP Corporations claiming film production credits.
    Schedule FW Corporations claiming a food processing plant and food warehouse investment credit.
    Schedule HI Corporations claiming a health insurance risk-sharing plan assessments credit.
    Schedule HR Corporations claiming a historic rehabilitation credit.
    Schedule JC Corporations claiming a job creation deduction.
    Schedule JT Corporations claiming a jobs tax credit.
    Schedule MI Corporations claiming a manufacturing investment credit.
    Schedule MP Corporations claiming a meat processing facility investment credit.
    Schedule MS Corporations having a manufacturer's sales tax credit carryforward.
    Schedule PE Corporations claiming a postsecondary education credit.
    Schedule R Corporations claiming a research credit.
    Schedule R-1 Corporations claiming increased research credits for activities related to internal combustion engines.
    Schedule R-2 Corporations claiming increased research credits for activities related to certain energy efficient products.
    Schedule RB Corporations claiming a relocated business credit or deduction.
    Schedule RT Corporations required to disclose related entity expenses.
    Schedule RT-1 Summarizes related party expenses disallowed.
    Schedule TC Corporations claiming a technology zone credit.
    Schedule V Corporations reporting additions to federal income.
    Schedule VC Corporations claiming an early stage seed investment credit.
    Schedule VE Corporations claiming a veteran employment credit.
    Schedule W Corporations reporting subtractions from federal income.
    Schedule WB Corporations claiming a woody biomass harvesting and processing credit.
    Schedule WC Corporations claiming a water consumption credit.
    Schedule Y Corporations claiming a deduction for dividends received.

  3. Which tax forms and schedules must a partnership file?

    Form Name Description Possible Forms and Schedules
    Form 3 Partnerships, including limited liability companies treated as partnerships. 3K-1, 4A-1, 4A-2, BC, CM, DC, DI, DM, EB, EC, ED, EM, FL, FP, FW, HI, HR, JC, JT, MP, PE, RB, RT, RT-1, TC, VC, VE, WB, WC, 3U
    Form 1CNP Partnerships having two or more qualifying nonresident partners may file a composite return to report and pay the Wisconsin income tax owed by those partners.  
    Form PW-1 Partnerships having at least one nonresident partner or member who is not a tax exempt entity and whose share of distributable income allocable from the partnership is $1,000 or more. PW-U
    Form PW-2 Nonresident partners use Form PW-2 to claim exemption from Wisconsin's withholding tax on income from pass-through entities.  

  4. What are the supplemental forms and schedules for partnerships?

    Form Name Description
    Form 4A-1 Multistate partnerships using a single factor apportionment method to compute Wisconsin income.
    Form 4A-2 Multistate partnerships using a multiple factor apportionment method to compute Wisconsin income.
    Schedule 3K-1 Partner's share of income, deductions, credits, etc.
    Schedule 3U Partnerships computing underpayment interest.
    Schedule BC Partnerships computing a biodiesel fuel production credit.
    Schedule CM Partnerships computing a community rehabilitation credit.
    Schedule DC Partnerships computing a development zones credit.
    Schedule DI Partnerships computing a dairy and livestock farm investment credit.
    Schedule DM Partnerships computing a dairy manufacturing facility investment credit.
    Schedule EB Partnerships computing an ethanol and biodiesel fuel pump credit.
    Schedule EC Partnerships computing an enterprise zone jobs credit.
    Schedule ED Partnerships computing an economic development tax credit.
    Schedule EM Partnerships computing an electronic medical records credit.
    Schedule FL Partnerships computing a beginning farmer and farm asset owner credit.
    Schedule FP Partnerships computing film production credits.
    Schedule FW Partnerships computing a food processing plant and food warehouse investment credit.
    Schedule HI Partnerships computing a health insurance risk-sharing plan assessments credit.
    Schedule HR Partnerships computing a historic rehabilitation credit.
    Schedule JC Partnerships computing a job creation deduction.
    Schedule JT Partnerships computing a jobs tax credit.
    Schedule MP Partnerships computing a meat processing facility investment credit.
    Schedule PE Partnerships computing a postsecondary education credit.
    Schedule RB Partnerships computing a relocated business credit or deduction.
    Schedule RT Partnerships required to disclose related entity expenses.
    Schedule RT-1 Summarizes related party expenses disallowed.
    Schedule TC Partnerships computing a technology zone credit.
    Schedule VC Partnerships computing an angel investment credit or early stage seed investment credit.
    Schedule VE Partnerships computing a veteran employment credit.
    Schedule WB Partnerships computing a woody biomass harvesting and processing credit.
    Schedule WC Partnerships computing a water consumption credit.

  5. Which tax forms and schedules must a sole proprietor file?

    Form Name Description Possible Forms and Schedules
    Form 1 Individuals who are full-year Wisconsin residents. BC, CM, CR, DC, DI, DM, EB, EC, ED, EDS, EM, FC, FC-A, FL, FP, FW, H, HR, I, JC, JT, MI, MP, MS, MT, OS, PE, RB, RS, RT, RT-1, TC, U, VC, VE, WB, WC, WD
    Form 1NPR Individuals who are nonresidents or part-year residents of Wisconsin. BC, CM, CR, DC, DI, DM, EB, EC, ED, EDS, EM, FC, FC-A, FL, FP, FW, HR, I, JC, JT, MI, MP, MS, PE, RB, RS, RT, RT-1, TC, U, VC, VE, WB, WC, WD

  6. What are the supplemental schedules for sole proprietors?

    Form Name Description
    Schedule BC Sole proprietors claiming a biodiesel fuel production credit.
    Schedule CM Sole proprietors claiming a community rehabilitation credit.
    Schedule CR Wisconsin credit summary schedule.
    Schedule DC Sole proprietors claiming a development zones credit.
    Schedule DI Sole proprietors claiming a dairy and livestock farm investment credit.
    Schedule DM Sole proprietors claiming a dairy manufacturing facility investment credit.
    Schedule EB Sole proprietors claiming an ethanol and biodiesel fuel pump credit.
    Schedule EC Sole proprietors claiming an enterprise zone jobs credit.
    Schedule ED Sole proprietors claiming an economic development tax credit.
    Schedule EDS Sole proprietors who are subject to the economic development surcharge.
    Schedule EM Sole proprietors claiming an electronic medical records credit.
    Schedule FC Sole proprietors claiming a farmland preservation credit.
    Schedule FC-A Sole proprietors claiming a farmland preservation credit.
    Schedule FL Sole proprietors claiming a beginning farmer and farm asset owner credit.
    Schedule FP Sole proprietors claiming film production credits.
    Schedule FW Sole proprietors claiming a food processing plant and food warehouse investment credit.
    Schedule H Sole proprietors claiming a homestead credit (full-year Wisconsin residents only).
    Schedule HR Sole proprietors claiming a historic rehabilitation credit.
    Schedule I Adjustments to convert federal adjusted gross income and itemized deductions to the amounts allowable for Wisconsin.
    Schedule JC Sole proprietors claiming a job creation deduction.
    Schedule JT Sole proprietors claiming a jobs tax credit.
    Schedule MI Sole proprietors claiming a manufacturing investment credit.
    Schedule MP Sole proprietors claiming a meat processing facility investment credit.
    Schedule MS Sole proprietors having a manufacturer's sales tax credit carryforward.
    Schedule MT Sole proprietors subject to the alternative minimum tax.
    Schedule OS Sole proprietors claiming credit for net tax paid to another state.
    Schedule PE Sole proprietors claiming a postsecondary education credit.
    Schedule RB Sole proprietors claiming a relocated business credit or deduction.
    Schedule RT Sole proprietors required to disclose related entity expenses.
    Schedule RT-1 Summarizes related party expenses disallowed.
    Schedule TC Sole proprietors claiming a technology zone credit.
    Schedule U Sole proprietors computing underpayment interest.
    Schedule VC Sole proprietors claiming venture capital credits.
    Schedule VE Sole proprietors claiming a veteran employment credit.
    Schedule WB Sole proprietors claiming a woody biomass harvesting and processing credit.
    Schedule WC Sole proprietors claiming a water consumption credit.
    Schedule WD Sole proprietors reporting capital gains or losses.

FOR MORE INFORMATION PLEASE CONTACT:

WISCONSIN DEPARTMENT OF REVENUE
Corporation Franchise/Income Tax Assistance
PO Box 8906
Madison, WI 53708-8906
Phone: (608) 266-2772
Fax: (608) 267-0834
Email additional questions to DORFranchise@revenue.wi.gov

October 29, 2013