What documentation do I need to provide when filing my Wisconsin state taxes?

When filing your Wisconsin state taxes, it is important to provide the necessary documentation to ensure accuracy and compliance. Key documents to include are your federal tax return (Form 1040), all relevant schedules, and any supporting forms such as Form W-2, 1099s, and 1098s. Additionally, include copies of any Wisconsin income tax returns filed in previous years. If you are claiming any deductions or credits, you must also provide supporting documentation for these expenses, such as receipts, invoices, and records of charitable contributions or medical expenses. Remember to include any other relevant documents related to your income, investments, or property ownership. Providing complete and accurate documentation will help facilitate the processing of your Wisconsin state tax return.