If you filed an amended return with the Internal Revenue Service or anotherstate, you generally must also file an amended Wisconsin return within 90 days. You need to file an amended Wisconsinreturnifthe changes affectyourWisconsinincome, any credit, or tax payable. Use Form 1X to file an amended Wisconsin return (Form X‑NOL if amending to carry back a 2014 net operating loss).
You may be able to electronically file the Form 1X through the department’s Wisconsin e-file application at revenue.wi.gov or through your software package.
If you are amending 2012 and 2013 returns to carry back a net operating loss incurred in 2014, you must file the amended returns on 2012 and 2013 Forms X‑NOL.