The Internal Revenue Service (IRS) has adjusted my federal income tax return. What should I do for Wisconsin?
If the IRS adjusts your federal income and that changes your Wisconsin income (which it will in most cases), the law requires you to report the adjustments to Wisconsin within 90 days of the adjustments becoming final. The adjustments must be reported on an amended Wisconsin income tax return. If you do not amend your Wisconsin return, we will adjust your original return when we receive information about the federal adjustments from the IRS. Since interest is charged on the additional tax due from the due date of the return to the date paid, this will result in you having to pay an extra amount of interest.
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