Wisconsin Modification Instructions (WEI) are a set of rules and procedures provided by the state of Wisconsin for making modifications to Wisconsin state tax returns or filings. WEI consists of two parts: general instructions and specific instructions. The general instructions provide instructions on how to make specific changes to a state tax return or filing, and the specific instructions provide detailed information on how to complete the actual modification or filing. WEI is used by individuals, businesses, and other entities to make changes to existing tax filings and returns in order to comply with the Wisconsin tax laws. The types of Wisconsin Modification Instructions include: filing a Wisconsin amended return, correcting an incorrect filing, requesting an extension of filing time, changing the filing status, changing the amount of taxes owed, and changing the filing address.