State program
Wisconsin Research Expense Credit
A partially refundable credit with enhanced rates for internal combustion engine and energy efficient product research.
- Partly refundable
Last reviewed October 2026
Program overview
Wisconsin allows a credit on the increase in qualified research expenses conducted in Wisconsin, with a doubled rate for research related to designing internal combustion engines and energy efficient lighting systems. A meaningful share of the credit is refundable, with the balance carried forward, which combines cash support for early-stage companies with long-term value for established manufacturers. Wisconsin follows federal Section 41 definitions applied to in-state activity.
Eligibility
Corporations and pass-through entities with qualified research expenses for research conducted in Wisconsin.
Benefits
Partially refundable credit against Wisconsin income and franchise tax, with the remainder carried forward.
Caps, deadlines and forms
Caps and limits
No annual cap is stated for this program.
Deadlines
Claimed on the annual return; no separate application deadline is stated.
Forms
Filing forms are listed by the revenue authority: official source (opens in a new tab).
Wisconsin IDR questions
What an examiner is likely to ask about this credit. S1–S7 apply to every state claim; the rest come from this program's own rules.
- S1Confirm the research was physically performed within Wisconsin.
- S2Provide the Wisconsin qualified research expense calculation and base amount.
- S3Reconcile Wisconsin expenses to the federal Form 6765.
- S4Show how wages and supplies were apportioned between Wisconsin and other locations.
- S5Provide the Wisconsin return and credit schedule for each year claimed.
- S6Show the carryforward schedule for unused Wisconsin credits.
- S7Confirm the entity claiming the credit is the entity subject to Wisconsin tax.
- WI-1Show the Wisconsin refund eligibility tests (such as small business status) were met in each year refunded.
Draft questions for illustration, reviewed by a specialist before any engagement.
Common weak spots
- Expenses for research performed outside Wisconsin included in the Wisconsin claim.
- Refund claimed without evidence that the eligibility tests were met.
- Base amount computed from incomplete historical records.
See how your claim holds up
The mock audit drafts these questions for your own claim and scores the evidence behind each answer.
Run a mock audit for WisconsinInformation on this page is general in nature, not tax advice. Program details change frequently; always confirm current rules with the relevant revenue authority or engage a specialist before acting. Last reviewed October 2026.
Find out what your research actually qualifies for
A scoping conversation takes thirty minutes and costs nothing. You leave with a view on eligibility, likely credit range and the documentation you would need.
Free R&D mock audit: completely free. Book a call or email hello@creditarmor.ai for a login.
