Yes. The Wisconsin Department of Revenue requires you to file W2 online even if there was no state withholding.
Yes. You will also need to file the annual withholding reconciliation form WT-7, but only if you have Wisconsin withholding.
Form WT-7 is used for reporting employers’ annual reconciliation of Wisconsin Income Tax withheld from wages. WT-7 need to be filed only if there is Form W2 withholding. The amounts reported on the WT-7 should match up with the taxes reported on W-2 forms.
The filing due date for both is the last day of January.
In the state of Wisconsin you can efile w2 forms, or you can paper-file.
The state of Wisconsin mandates you efile W2 forms when submitting 10 or more. E-filing is preferred in general, but if you are submitting fewer than 10 W2s you may paper file.
TaxBandits supports only the Wisconsin W2. You need to file the annual reconciliation form WT-7 directly with the state.