When two or more people form a business partnership, they rely on trust. The law in Wisconsin reinforces this trust through legally binding obligations known as fiduciary duties. If a partner violates these duties by stealing from the company, hiding transactions, or engaging in secret competition, the consequences can be devastating financially. Understanding how these obligations work is the first step in protecting what has been built.

What Are Fiduciary Duties Between Business Partners?

Under the Wisconsin Uniform Partnership Act, business partners have two core fiduciary duties:

• Duty of loyalty: Each partner must put the interests of the partnership above their own personal gain. This means avoiding self-dealing and refraining from competing with the business without permission. Partners must also disclose any material conflicts of interest that may arise.
• Duty of care: Each partner should act with the level of competence and diligence expected of a reasonable person in similar business situations. They should avoid making grossly negligent or reckless decisions that could harm the business.

For members of a limited liability company, Wis. Stat. § 183.0409 governs standards of conduct. It is important to note that LLC operating agreements can modify or even eliminate certain fiduciary duties within the limits allowed by statute. This means that your operating agreement is one of the most significant documents in any business dispute.

Common Breaches in Business Partner Disputes

Not every disagreement between partners escalates to a legal violation of fiduciary duties. Courts consider specific actions that cross the line. Some common violations include:

• Diversion of business opportunities to personal ventures or competing entities
• Withdrawal or transfer of partnership funds without permission
• Falsification of financial records or hiding material transactions from other partners
• Conclusion of self-dealing contracts that benefit one partner at the expense of the partnership
• Misuse of confidential business information or trade secrets for personal gain

In 2025 and continuing into 2026, courts in Wisconsin saw an increase in disputes over fiduciary duties involving closely held limited liability companies (LLCs), particularly where operating agreements were unclear or silent on important obligations. This lack of clarity often led courts to apply default statutory rules that may not have reflected the original intentions of the partners.

What Must Be Proven in a Fiduciary Duty Claim?

To succeed in a breach of fiduciary duty claim in Wisconsin, the plaintiff must prove three things:

1. There was a fiduciary relationship between the parties.
2. The defendant failed to fulfill a specific duty that arose from that relationship.
3. This breach directly caused the plaintiff’s losses.

The legal standard for partner behavior depends on the specific duty in question. According to Wisconsin Statute § 178.0404, partners have a duty of care that can be violated through gross negligence, recklessness, or intentional actions, or through knowingly violating laws. In contrast, the duty of loyalty establishes a higher standard prohibiting any conduct that puts a partner’s personal interests above those of the partnership.

Remedies Available to the Injured Partner

When a court finds that there has been a breach of the partnership agreement, the injured party may be entitled to various remedies:

• Compensatory damages – Monetary compensation for losses directly related to the breach.
• Disgorgement of profits – The court may order the breaching party to return any profits they have gained through unlawful means.
• An accounting – A court-appointed review of the partnership’s financial records, as outlined in Wis. Stat. § 178.0405.
• Injunctive relief – A court order preventing ongoing harmful or unfair conduct.
• Attorney’s fees – In some cases, the court may award attorney’s fees to the injured party, particularly if the operating agreement includes provisions for fee shifting.

Wisconsin courts have broad equitable authority in these matters. Remedies may extend beyond simple dollar-for-dollar compensation to address the full extent of harm caused by a breach of trust.

Why Your Partnership Agreement Matters

A well-crafted partnership or LLC operating agreement serves as your first line of defense in the event of a dispute. Courts will look to this document when evaluating any disagreement between parties. A strong agreement can clearly define which fiduciary obligations apply, limit liability for specific breaches, establish mandatory notice or remedy periods prior to litigation, and outline preferred methods for resolving disputes, such as arbitration or mediation.

If your agreement is poorly drafted or nonexistent, you will be entirely dependent on Wisconsin’s default statutory regulations – which may not reflect how you intended your partnership to function when you first started your business together.

Speak With a Business Litigation Attorney

Fiduciary duty disputes between business partners can be legally complex and have significant financial implications. If you suspect that a business partner has breached their legal obligations, it is important to act quickly. The litigation attorneys at Kerkman & Dunn specialize in representing business partners in such complex disputes throughout Wisconsin. 

Whether your case requires emergency injunctive relief, a negotiated settlement, or a full trial, we have the proven experience and practical expertise to pursue the best outcome for you. We understand the importance of swift action and can help you navigate the legal process. Schedule a consultation with us today to discuss your options.