1120 Wisconsin electronic filing information

State contact information

If you have specific questions about what you can e-file or about rejections you received, contact the state for more information.
Wisconsin Department of Revenue
P.O. Box 8949 Madison, WI 53708-8949
Email
: efiling@dor.state.wi.us
Phone
: 608.264.6886

State electronic filing details

Grace period
10 days
E-filing mandate
Yes, all returns
Accepts state-only filings
Yes
Return types accepted
C Corporation
S Corporation
Consolidated: Form 6 for C corp, and Form 5S for Qsub S corp
Amended
Short Year
Estimates (filed with return)
1CNS (Composite)
PW-1 (Withholding)
Form 4H
Extension
Return types not accepted
N/A
Direct deposit of refunds
Yes
Accepted forms of payment
Direct debit (EFW)
Electronic funds transfer (EFT)
Check by mail
Signature requirements
ERO retains signed filing authorization
Supports PDF attachments
Yes
Tax year(s) supported for e-filing
Current tax year and two prior tax years
Special considerations
Electronic payments are mandated if the prior year tax was greater than $1,000.

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