2021 Corporation Tax Forms

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​If you have questions about our fill-in forms, please refer to our instructions. This option will not electronically file your form.

Need to file your tax return? See the 2020 income tax forms.

  
  
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8/20/2021 4:21 PMForm-Corp; Form-Flat2021ISE-Admin-TechForm 1CNSNoComposite Wisconsin Individual Income Tax Return for Nonresident Tax-Option (S) Corporation ShareholdersDRAFT
  
8/30/2021 5:10 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 4NoWisconsin Non-Combined Corporation Franchise or Income Tax ReturnDRAFT
  
8/27/2021 5:26 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 4466WNoWisconsin Corporation or Pass-Through Entity Application for Quick Refund of Overpayment of Estimated TaxDRAFT
  
8/27/2021 5:29 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 4BLNoWisconsin Net Business Loss Carryforward for Separate Entity CorporationsDRAFT
  
8/27/2021 5:29 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 4HNoWisconsin Corporation Declaration of InactivityDRAFT
  
9/9/2021 1:41 PMForm; Form-Corp; Form-Fiduciary; Form-Flat2021ISE-Admin-TechForm 4TNoWisconsin Exempt Organization Business Franchise or Income Tax ReturnDRAFT
  
8/27/2021 5:29 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 5ENoWisconsin Election by an S Corporation Not to Be Treated as a Tax-Option CorporationDRAFT
  
9/3/2021 9:45 AMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 5RNoWisconsin Revocation of Election by an S Corporation Not to Be a Tax-Option CorporationDRAFT
  
10/1/2021 3:15 PMForm-Corp; Form-Flat2021ISE-Admin-TechForm 5SNoWisconsin Tax-Option (S) Corporation Franchise or Income Tax ReturnDRAFT
  
8/30/2021 5:10 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 6NoWisconsin Combined Corporation Franchise or Income Tax ReturnDRAFT
  
8/31/2021 4:46 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 6BLNoWisconsin Net Business Loss Carryforward for Combined Group MembersDRAFT
  
8/27/2021 4:17 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 6CLNoWisconsin Capital Loss AdjustmentDRAFT
  
8/27/2021 5:26 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 6CSNoWisconsin Sharing of Research CreditsDRAFT
  
8/27/2021 5:29 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 6INoWisconsin Adjustment for Insurance CompaniesDRAFT
  
8/27/2021 5:29 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm 6YNoWisconsin Modification for DividendsDRAFT
  
8/20/2021 3:25 PMForm-Corp; Form-Flat; Form-Ind-Income; Form-Fiduciary; Form-Partnership2021ISE-Admin-TechForm 9bNoMiscellaneous IncomeDRAFT
  
8/27/2021 4:15 PMForm-Corp; Form-Flat; Form; Form-Partnership2021ISE-Admin-TechForm CNoWisconsin Allocation and Separate Accounting DataDRAFT
  
2/5/2021 1:41 PMForm; Form-Corp; Form-Instructions2021ISE-Admin-TechForm Corp-ES InstructionsNoWisconsin Corporation Estimated Tax Voucher InstructionsFINAL
  
8/30/2021 3:19 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm CUNoWisconsin Credit Union Declaration of Exempt StatusDRAFT
  
1/7/2021 12:17 PMForm; Form-Corp; Form-Fill-In; Form-Ind-Income; Form-Partnership; Form-Fiduciary2021ISE-Admin-TechForm HR-T (Fill-In Form)NoTransfer of Supplement to Federal Historic Rehabilitation Credit Fill-In FormFINAL
  
1/7/2021 12:17 PMForm; Form-Corp; Form-Fiduciary; Form-Ind-Income; Form-Instructions; Form-Partnership2021ISE-Admin-TechForm HR-T InstructionsNoTransfer of Supplement to Federal Historic Rehabilitation Credit InstructionsFINAL
  
8/27/2021 5:28 PMForm; Form-Corp; Form-Flat; Form-Partnership2021ISE-Admin-TechForm NNoWisconsin Nonapportionable, Separately Accounted, and Separately Apportioned IncomeDRAFT
  
8/16/2021 11:26 AMForm-Corp; Form-Fiduciary; Form-Flat; Form-Partnership2021ISE-Admin-TechForm PW-1NoWisconsin Nonresident Income or Franchise Tax Withholding on Pass-Through Entity IncomeDRAFT
  
10/14/2021 7:49 AMForm-Fiduciary; Form-Instructions; Form-Partnership; Form-Corp2021ISE-Admin-TechForm PW-1 InstructionsNo Wisconsin Nonresident Income or Franchise Tax Withholding on Pass-Through Entity Income InstructionsFINAL
  
12/8/2020 8:10 AMForm-Corp; Form-Instructions; Form-Partnership; Form-Fiduciary2021ISE-Admin-TechForm PW-ES InstructionsNoWisconsin Pass-Through Entity Withholding Electronic Payment Voucher InstructionsFINAL
  
8/16/2021 11:26 AMForm-Corp; Form-Fiduciary; Form-Flat; Form-Partnership2021ISE-Admin-TechForm PW-UNoUnderpayment of Estimated Withholding Tax by Pass-Through EntitiesDRAFT
  
10/11/2021 2:06 PMForm-Corp; Form-Fiduciary; Form-Instructions; Form-Partnership2021ISE-Admin-TechForm PW-U InstructionsNoUnderpayment of Estimated Withholding Tax by Pass-Through Entities InstructionsFINAL
  
8/27/2021 5:29 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechForm UNoUnderpayment of Estimated Tax by CorporationsDRAFT
  
9/8/2021 10:17 AMForm-Corp; Form-Flat; Form-Instructions; Form-Partnership2021ISE-Admin-TechForm WQOF InstructionsNoWisconsin Qualified Opportunity Fund CertificateFINAL
  
10/6/2021 3:19 PMForm; Form-Corp; Form-Flat; Form-Ind-Income; Form-Partnership; Form-Fiduciary2021ISE-Admin-TechForm W-RAYesRequired Attachments for Electronic FilingFINAL
  
10/6/2021 3:19 PMForm; Form-Corp; Form-Fiduciary; Form-Fill-In; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechForm W-RA (Fill-In Form)NoRequired Attachments for Electronic Filing Fill-In FormFINAL
  
8/27/2021 5:26 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechSchedule 4INoWisconsin Adjustments for Insurance CompaniesDRAFT
  
8/30/2021 3:18 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechSchedule 4VNoWisconsin Additions to Federal IncomeDRAFT
  
8/30/2021 3:18 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechSchedule 4WNoWisconsin Subtractions From Federal IncomeDRAFT
  
8/27/2021 5:26 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechSchedule 4YNoWisconsin Subtraction Modification for DividendsDRAFT
  
8/18/2021 5:56 PMForm-Flat; Form-Corp2021ISE-Admin-TechSchedule 5K-1NoTax-Option (S) Corporation Shareholder’s Share of Income, Deductions, Credits, etc.DRAFT
  
8/16/2021 11:26 AMForm-Corp; Form-Flat2021ISE-Admin-TechSchedule 5S-ETNoEntity-Level Tax ComputationDRAFT
  
10/14/2021 12:06 PMForm-Corp; Form-Flat; Form-Instructions2021ISE-Admin-TechSchedule 5S-ET InstructionsNoEntity-Level Tax Computation InstructionsFINAL
  
8/27/2021 3:22 PMForm; Form-Flat; Form-Corp; Form-Fiduciary; Form-Ind-Income; Form-Partnership2021ISE-Admin-InvSchedule A-01NoWisconsin Single Sales Factor Apportionment Data for Nonspecialized IndustriesDRAFT
  
8/27/2021 3:23 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule A-02NoWisconsin Apportionment Percentage for Interstate Financial InstitutionsDRAFT
  
8/27/2021 3:23 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule A-03NoWisconsin Apportionment Percentage for Interstate Motor CarriersDRAFT
  
8/27/2021 3:23 PMForm; Form-Corp; Form-Fiduciary; Form-Ind-Income; Form-Flat; Form-Partnership2021ISE-Admin-TechSchedule A-04NoWisconsin Apportionment Percentage for Interstate Telecommunications CompaniesDRAFT
  
8/27/2021 3:24 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule A-05NoWisconsin Premium Factor for Insurance Companies DRAFT
  
8/27/2021 3:25 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Instructions; Form-Partnership; Form-Ind-Income2021ISE-Admin-TechSchedule A-06NoWisconsin Receipts Factor for Interstate Brokers-Dealers, Investment Advisors, Investment Companies, and UnderwritersDRAFT
  
8/27/2021 3:26 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule A-07NoWisconsin Apportionment Percentage for Interstate Air CarriersDRAFT
  
8/27/2021 3:26 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule A-08NoWisconsin Apportionment Percentage for BroadcastersDRAFT
  
8/27/2021 3:26 PMForm; Form-Corp; Form-Fiduciary; Form-Ind-Income; Form-Flat; Form-Partnership2021ISE-Admin-TechSchedule A-09NoWisconsin Apportionment Percentage for Interstate RailroadsDRAFT
  
8/27/2021 3:26 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule A-10NoWisconsin Apportionment Percentage for Interstate Pipeline CompaniesDRAFT
  
8/27/2021 3:27 PMForm; Form-Corp; Form-Fiduciary; Form-Ind-Income; Form-Partnership; Form-Flat2021ISE-Admin-TechSchedule A-11NoWisconsin Apportionment Percentage for Interstate Air Freight Forwarders Affiliated with a Direct Air CarrierDRAFT
  
10/12/2021 12:45 PMForm; Form-Corp; Form-Fiduciary; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule ARYesExplanation of Amended ReturnFINAL
  
10/12/2021 12:45 PMForm-Corp; Form; Form-Fiduciary; Form-Fill-In; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule AR (Fill-In Form)NoExplanation of Amended Return Fill-In FormFINAL
  
8/30/2021 4:50 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule BDNoBusiness Development CreditDRAFT
  
10/8/2021 10:24 AMForm; Form-Fiduciary; Form-Ind-Income; Form-Flat; Form-Corp2021ISE-Admin-TechSchedule CFYesCarryforward of Unused CreditsFINAL
  
10/8/2021 10:25 AMForm-Fill-In; Form-Ind-Income; Form-Corp; Form-Fiduciary2021ISE-Admin-TechSchedule CF (Fill-In Form)NoCarryforward of Unused Credits Fill-In FormFINAL
  
10/6/2021 2:54 PMForm-Corp; Form-Ind-Income; Form-Instructions; Form-Fiduciary2021ISE-Admin-TechSchedule CF InstructionsNoCarryforward of Unused Credits InstructionsFINAL
  
8/30/2021 3:19 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule CMNoCommunity Rehabilitation Program CreditDRAFT
  
10/8/2021 10:19 AMForm; Form-Flat; Form-Ind-Income; Form-Fiduciary; Form-Corp2021ISE-Admin-TechSchedule CRYesOther CreditsFINAL
  
10/8/2021 10:19 AMForm-Ind-Income; Form-Fill-In; Form-Corp; Form-Fiduciary2021ISE-Admin-TechSchedule CR (Fill-In Form)NoOther Credits Fill-In FormFINAL
  
10/7/2021 8:23 AMForm-Corp; Form-Ind-Income; Form-Fiduciary; Form-Instructions2021ISE-Admin-TechSchedule CR InstructionsNoOther Credit InstructionsFINAL
  
8/30/2021 3:19 PMForm; Form-Corp; Form-Flat2021ISE-Admin-TechSchedule CU-1NoCredit Union Adjustment to IncomeDRAFT
  
8/31/2021 9:50 AMForm; Form-Corp; Form-Flat; Form-Fiduciary; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule DCNoWisconsin Development Zones CreditsDRAFT
  
8/30/2021 3:19 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule DENoDisregarded Entity ScheduleDRAFT
  
8/30/2021 3:20 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule ECNoEnterprise Zone Jobs CreditDRAFT
  
8/30/2021 3:20 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule EDNoWisconsin Economic Development Tax CreditDRAFT
  
8/30/2021 4:52 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule EITNoElectronics Information Technology Manufacturing Zone CreditDRAFT
  
8/30/2021 4:52 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule ESNoEmployee College Savings Account Contribution CreditDRAFT
  
8/16/2021 11:26 AMForm-Corp; Form-Flat; Form-Partnership2021ISE-Admin-TechSchedule ET-OSNoCredit for Net Tax Paid to Another StateDRAFT
  
10/11/2021 4:18 PMForm-Corp; Form-Instructions; Form-Partnership2021ISE-Admin-TechSchedule ET-OS InstructionsNoCredit for Net Tax Paid to Another State InstructionsFINAL
  
8/12/2021 12:07 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income2020ISE-Admin-TechSchedule FCNoFarmland Preservation CreditDRAFT
  
8/12/2021 12:09 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income2021ISE-Admin-TechSchedule FC-ANoFarmland Preservation CreditDRAFT
  
8/30/2021 3:18 PMForm; Form-Corp; Form-Flat; Form-Ind-Income; Form-Fiduciary; Form-Partnership2021ISE-Admin-TechSchedule HRNoWisconsin Historic Rehabilitation CreditsDRAFT
  
1/7/2021 12:17 PMForm; Form-Corp; Form-Fiduciary; Form-Fill-In; Form-Ind-Income; Form-Instructions; Form-Partnership2021ISE-Admin-TechSchedule HR-5 (Fill-In Form)NoWisconsin Supplement to the Federal Historic Rehabilitation Tax Credit - Five-Year Credit Claim Fill-In FormFINAL
  
1/7/2021 12:17 PMForm; Form-Corp; Form-Fiduciary; Form-Ind-Income; Form-Instructions; Form-Partnership2021ISE-Admin-TechSchedule HR-5 InstructionsNoWisconsin Supplement to the Federal Historic Rehabilitation Tax Credit - Five-Year Credit Claim InstructionsFINAL
  
8/30/2021 4:52 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule JTNoWisconsin Jobs Tax CreditDRAFT
  
8/30/2021 4:52 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule LINoWisconsin Low-Income Housing Tax CreditDRAFT
  
8/30/2021 4:51 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule MA-ANoWisconsin Agricultural CreditDRAFT
  
8/30/2021 4:52 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule MA-MNoWisconsin Manufacturing Credit DRAFT
  
8/30/2021 4:51 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule MINoManufacturing Investment CreditDRAFT
  
9/16/2021 2:33 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule MSNoWisconsin Manufacturer’s Sales Tax Credit Carryforward AllowableDRAFT
  
8/30/2021 4:51 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule RNoWisconsin Research CreditsDRAFT
  
8/27/2021 5:26 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule RTNoWisconsin Related Entity Expenses Disclosure StatementDRAFT
  
8/27/2021 5:26 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule RT-1NoStatement of Disallowed Related Entity ExpensesDRAFT
  
8/30/2021 4:50 PMForm; Form-Corp; Form-Fiduciary; Form-Flat; Form-Ind-Income; Form-Partnership2021ISE-Admin-TechSchedule VCNoWisconsin Venture Capital CreditsDRAFT

* Prior to finalization, many of the major Wisconsin income and franchise tax forms and instructions are available as advance drafts. Note: These advance draft items are not final and are subject to change at any time.