Wisconsin Late Fee Calculator
Work out interest on an overdue B2B invoice under Wisconsin law. The legal default rate — what applies when the contract is silent — is 5%, and the statute is quoted verbatim below. All math runs locally in your browser.
Legal rate when the contract is silent; runs from the contractual due date (or from demand/suit if no time is set).
Late fee breakdown
- Interest owed
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- Daily rate
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- Total (invoice + interest)
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Still unpaid? Generate a formal demand letter — it computes the interest and cites Wisconsin's statute (Wis. Stat. §§ 138.04, 138.05) for you.
What Wisconsin law actually says
The rate of interest upon the loan or forbearance of any money, goods or things in action shall be $5 upon the $100 for one year [...] This section does not apply to any loan or forbearance which is made on or after November 1, 1981 [...] except [...] forbearances occurring primarily for personal, family or household purposes [...]
Quoted verbatim from the linked official source — not our paraphrase. How we source and re-check every row is documented in the data methodology.
Maximum late fee in Wisconsin — written B2B contracts
No statutory cap
Wis. Stat. s. 138.05 does not reach any loan or forbearance made on or after Nov. 1, 1981; the only carve-back is a consumer (personal, family or household) forbearance whose only charge is a penalty or late charge for nonpayment when due. A business late fee is therefore uncapped. The corporation/LLC exemption (sub. (5)) and the $150,000+ exemption (sub. (7)) are additional, older layers.
Basis: Wis. Stat. s. 138.05(8)(c), (5), (7). Compare all 51 jurisdictions on the full state table and the cap-regime map.
B2B invoices only — not rent, not consumer debt
Everything on this page is about business-to-business invoices. Residential rent late fees live in Wisconsin's landlord-tenant law and consumer credit has separate, stricter rules — two different bodies of law. The distinction is explained in B2B invoice late fees vs. residential rent.
Use this data
Wisconsin's row — rate, cap, citation, verbatim quote, verification date — is part of our open 51-jurisdiction dataset: CSV · JSON (CC BY 4.0, cite myinvoicetemplate.com). Set late-fee terms on your next invoice with the free invoice generator, or state them clearly using the wording guidance in the payment terms guide.
Wisconsin late fee FAQ
Can I charge late fees on overdue invoices in Wisconsin?
Yes — on business-to-business invoices. If your contract or invoice states a late-fee rate, that rate governs (subject to the cap rules below). If nothing was agreed: 5%. Legal rate when the contract is silent; runs from the contractual due date (or from demand/suit if no time is set). Statute: Wis. Stat. §§ 138.04, 138.05, verified 2026-08-19. Consumer and rent debts follow separate laws.
What is the maximum late fee I can charge in Wisconsin?
For a written B2B contract: 12% nominal cap — but s. 138.05 does not apply to any loan or forbearance made on or after Nov. 1, 1981, except a consumer forbearance whose only charge is a late fee; loans to corporations/LLCs and deals of $150,000+ are separately exempt. No ceiling on B2B. Basis: Wis. Stat. s. 138.05(8)(c), (5), (7). The full cap analysis is in the section above; this covers business-to-business deals only — consumer credit has stricter separate caps.
What interest applies if my contract doesn't mention late fees in Wisconsin?
The statutory default rate of 5%. Legal rate when the contract is silent; runs from the contractual due date (or from demand/suit if no time is set). Statute: Wis. Stat. §§ 138.04, 138.05 (verbatim quote on this page, verified 2026-08-19).
Does this cover rent, apartment, or consumer late fees in Wisconsin?
No. This page covers business-to-business invoices only. Residential rent late fees are governed by Wisconsin's landlord-tenant law, and consumer credit for personal, family, or household purposes has its own stricter caps and disclosure rules. Those are different statutes than the commercial-interest law cited here.
Where does this data come from, and when was it verified?
Every figure on this page comes from our 51-jurisdiction dataset: each row researched against the controlling statute or the state's official current-rate page, independently re-checked, and stamped with its own verification date — Wisconsin's row was last verified 2026-08-19. The operative legal text is quoted verbatim on this page with a link to the official source, the methodology is public, every verification pass is logged in the changelog, and the full dataset is downloadable (CC BY 4.0).
Not legal advice. This page summarizes Wisconsin's commercial-interest statute for general information, with the verification date shown above — it tells you when we last confirmed the figures, not that they are still current today. Statutes change and courts interpret them; verify the cited statute at the official source, or ask a licensed attorney in your state, before charging or demanding interest.