Wisconsin 1099-INT Filing Requirements, Tax Year 2026
What Wisconsin requires from businesses filing 1099-INT (Interest income) for tax year 2026: deadline, accepted format, CF/SF treatment, registration, and penalties, backed by primary-source citations.
Filing requirements
Wisconsin does not require a separate state filing of 1099-INT for tax year 2026. Federal filing satisfies the reporting obligation; no state submission is required.
Wisconsin generally does not require 1099-INT to be filed with DOR. If Wisconsin income tax was withheld on the interest payment, the 1099-INT must be filed directly with DOR (electronic if you file 10 or more of any one type) by January 31, accompanied by the WT-7 reconciliation.
Conditional rules
Specific scenarios that change the baseline requirement above:
| Condition | Explanation |
|---|---|
| Direct filing recommended to avoid IRS forwarding delays |
Wisconsin DOR may not receive Forms 1099 from the IRS for several months, which can delay processing of a payee's income tax return. To avoid that delay, payers can file directly with the department by January 31 instead of relying on CF/SF. |
Deadlines and extensions
Extensions
Not applicable. Because 1099-INT is not required to be filed with Wisconsin, there is no state extension process.
Accepted format
No state filing is required for 1099-INT in Wisconsin, so no state-specific format applies.
Registration
Registration required: Yes
Late-filing penalties
Wisconsin penalty overview
Late or incorrect filing: $10 per violation for failure to file a wage statement or information return by the due date (including extensions) or for filing an incorrect/incomplete return. Penalty does not apply to W-2G.
Failure to e-file when required: $10 per statement/return for filers required to file electronically (10 or more) who file on paper.
Refund delay: Wisconsin DOR may not issue an employee refund before March 1 unless both employer and employee have filed all required returns and forms.
Waivers from the e-file mandate require Form EFT-102 received at least 30 days before the filing due date demonstrating undue hardship.
Frequently asked questions
Does Wisconsin require filing of 1099-INT for tax year 2026?
Does Wisconsin participate in the CF/SF program?
What is the Wisconsin 1099-INT filing deadline for tax year 2026?
What format does Wisconsin accept for 1099-INT?
Do I need to file 1099-INT with Wisconsin if I also filed federally?
What happens if I miss the Wisconsin 1099-INT deadline?
How do I register to file with Wisconsin?
Source citations
“"Payers must file certain types of 1099s with the Wisconsin Department of Revenue unless the payer participates in the Combined Federal/State Filing (CF/SF) program. However, even if you participate in the CF/SF program, you must submit 1099s with Wisconsin withholding directly to the Wisconsin Department of Revenue by January 31." “To avoid this delay, payers can file directly with the department using one of the methods listed in Section 4.””
“"Payers must file certain types of 1099s with the Wisconsin Department of Revenue unless the payer participates in the Combined Federal/State Filing (CF/SF) program. However, even if you participate in the CF/SF program, you must submit 1099s with Wisconsin withholding directly to the Wisconsin Department of Revenue by January 31." “To avoid this delay, payers can file directly with the department using one of the methods listed in Section 4.””
“Other information returns such as Forms 1099-DIV, 1099-INT, and 1099-K are required to be filed with the department only if Wisconsin tax is withheld.”
“If you withhold Wisconsin tax from any wage statement or information return, you must file the annual withholding reconciliation (Form WT-7) by January 31 or, if you discontinue business prior to the end of the calendar year, within 30 days of discontinuance.”
“For the Data File Transfer, we accept the following files. A. W-2 files in EFW2 Social Security Administration format B. W-2C files in EFW2C Social Security Administration format C. 1099-R, 1099-MISC, 1099-NEC, 1099-K, and W-2G files in Internal Revenue Service (IRS) format as shown in IRS Publication 1220.”
“The department may not receive Forms 1099 from the IRS for several months, which may delay the processing of a payee's income tax return. To avoid this delay, payers can file directly with the department using one of the methods listed in Section 4 by January 31.”
Additional notes
Wisconsin requires Forms W-2, W-2G, 1099-MISC, 1099-NEC, 1099-R (and Form 9b) to be filed with the Department of Revenue for payments to Wisconsin residents (any work location) or to nonresidents for services performed in Wisconsin. Forms 1099-DIV, 1099-INT, and 1099-K are required only when Wisconsin income tax has been withheld. Wisconsin participates in the IRS Combined Federal/State Filing Program (CF/SF state code 55), and CF/SF participation satisfies the Wisconsin filing requirement — except that any 1099 reporting Wisconsin withholding must still be filed directly with DOR by January 31. Filers of 10 or more wage statements or 10 or more of any one type of information return must file electronically. The annual reconciliation Form WT-7 is required from every employer that withheld Wisconsin tax and must be filed electronically by January 31 (February 2 in 2026).
Scope: Original 1099 filings with no Wisconsin state income tax withheld. State agencies revise rules without notice; verify with the Wisconsin state agency directly before you file.
This page is general information only, not legal, tax, or accounting advice. You are solely responsible for verifying your filing obligations with the state agency or a qualified tax professional.
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