Get WI Form 1CNS 2003-2024

When filing a Form 1, Form 1NPR, or Form 2 the Department of Revenue requires you to attach a complete copy of your federal income tax return.

Am I required to file a Wisconsin individual income tax return? Filing StatusAge as of the End of YearFull-Year ResidentsSingleUnder age 65$12,490 or moreSingleAge 65 or older$12,740 or moreMarried filing a joint returnBoth spouses under 65$23,220 or moreOne spouse 65 or older$23,470 or more5 more rows

The state corporate income tax rate is 7.9% and is applied to all income subject to the state corporate income tax. The resulting amount is the corporation's gross tax liability.

A domestic corporation (including a Subchapter S corporation) must file an income tax return whether it has taxable income or not, unless it's exempt from filing under section 501.

Every corporation organized under the laws of Wisconsin or licensed to do business in the state is required to file a Wisconsin corporate franchise tax return, regardless of whether or not business was transacted.

Composite returns are only available for qualifying nonresident partners of a partnership and nonresident shareholders of a tax-option (S) corporation. A beneficiary of an estate or trust must file their own Wisconsin income tax return.

Partnerships can avoid the compliance burden of having to make periodic withholding payments by filing a composite tax return. A composite return is one tax return filed by a partnership reporting the in-state income of the partnership attributed to all eligible nonresident partners.

Wisconsin also has a flat 7.90 percent corporate income tax rate. Wisconsin has a 5.00 percent state sales tax rate, a max local sales tax rate of 1.75 percent, and an average combined state and local sales tax rate of 5.43 percent. Wisconsin's tax system ranks 27th overall on our 2023 State Business Tax Climate Index.