Unfortunately, there is no upload feature to attach documents to the State tax return.
If you're mailing your Wisconsin tax return, you'll need to attach your rent certificate or rent verification to your return. If you're e-filing, you should mail your rent certificate or rent verification with Form W-RA to the Wisconsin Department of Revenue. Form W-RA will be available for you to print and mail once your return has been accepted by the Wisconsin Department of Revenue.
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