Wait until your federal return is corrected before filing an amended Missouri income tax return. You must attach a copy of your amended federal return or a copy of your revenue agent's report to your amended state return.
The IRS notice for unemployment will have a date.
When your federal taxable income or federal tax liability is changed as a result of an audit or notification by the Internal Revenue Service, or if you file an amended federal income tax return, you must report such change by filing an amended Missouri income tax return with the Department of Revenue
within 90 days of the change.
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