Joint Venture Disputes in California: What Co-Venturers Owe Each Other

Last updated: November 2026. Reviewed by Pavel Kolmogorov, California business litigation attorney (State Bar No. 321018).

A joint venture is an undertaking by two or more persons or companies to carry out a single business enterprise for profit. California treats it almost exactly like a partnership. (Weiner v. Fleischman (1991) 54 Cal.3d 476, 482.) If your co-venturer is keeping the profits, you have a right to information about the venture and a right to your agreed share. You may also have claims for breach of fiduciary duty and for an accounting. Kolmogorov Law, P.C. litigates joint venture disputes in Orange County, Los Angeles, and across California.

Call (909) 235-6116 or contact us online to discuss a venture in which the money, the control, or the information has stopped flowing to you.

What makes a joint venture

Three things, according to the California Supreme Court. To create a joint venture there must be an agreement giving the parties a joint interest in a common business undertaking, an understanding as to the sharing of profits and losses, and a right of joint control. (Holtz v. United Plumbing & Heating Co. (1957) 49 Cal.2d 501, 506-507.) Juries are instructed on these elements under CACI No. 3712.

No particular form is required. A joint venture may be created orally, or assumed from a reasonable deduction from the acts and declarations of the parties. (Weiner, supra, 54 Cal.3d at pp. 482-483.) It is proved by a preponderance of the evidence, the same standard as any other oral contract. (Id. at p. 490.)

Joint control is often the contested element. A lender who is repaid from project profits, or a contractor paid a percentage, usually has no say in decisions. Without that right, there is a contract but probably no venture.

Joint venture versus partnership

The difference is scope. A joint venture usually involves a single transaction or project. A partnership carries on a continuing business. From a legal standpoint the two relationships are virtually the same, and courts freely apply partnership law to joint ventures when appropriate. (Weiner, supra, 54 Cal.3d at p. 482.)

That borrowing matters, because the partnership statute supplies the default terms your handshake left out. Unless the venturers agreed otherwise, each is entitled to an equal share of the profits and bears losses in the same proportion. (Corp. Code, § 16401, subd. (b).) People who drifted into a continuing business together should read our page on accidental partnerships.

When the venture is really an LLC or a contract

Many projects called joint ventures are not unincorporated ventures at all.

An association formed under another statute is not a partnership under the partnership act. (Corp. Code, § 16202, subd. (b).) So if the parties formed a limited liability company to hold the project, the operating agreement and the LLC statute govern. The dispute is then usually analyzed as a breach of the operating agreement, a breach of the statute's fiduciary duties, or both. If they signed a development or co-marketing agreement stating that no partnership or joint venture is created, a court will usually give that language weight, though how the parties actually behaved still matters.

Sorting out which of these you have is the first thing I do. It determines who owes fiduciary duties, who can bind whom, and what the default economics are.

What co-venturers owe each other

Like partners, joint venturers are fiduciaries with a duty of disclosure and liability to account for profits. (Weiner, supra, 54 Cal.3d at p. 482.)

The statutory duty of loyalty fills in the detail. A partner must account for any profit or benefit derived from the business or from use of its property, including the appropriation of an opportunity. A partner must also refrain from dealing with the business on behalf of an adverse interest. (Corp. Code, § 16404, subd. (b).)

In a property development venture, the breaches tend to look alike. One side takes title in its own name. It pays itself an undisclosed development or management fee. It refinances and keeps the proceeds, or quietly buys the neighboring parcel the venture had been considering.

Information is a right, not a courtesy. Partners are entitled to access the books and records, and to receive on demand information about the business unless the demand is unreasonable or improper. (Corp. Code, § 16403, subds. (b), (c).)

Remedies when a co-venturer keeps the profits

The usual claims are breach of the venture agreement, breach of fiduciary duty, and an accounting. The accounting forces the other side to show what came in, what went out, and where the balance is.

Where venture money bought something held in the other party's name, a constructive trust may follow the asset. One who gains a thing by the violation of a trust or other wrongful act holds it as an involuntary trustee for the person who would otherwise have had it. (Civ. Code, § 2224.) If title to real property is at stake, recording a lis pendens can protect the claim while the case is pending.

If you are the venturer accused of keeping too much, the defense is usually in the documents. Fees the agreement authorized, costs you advanced, and losses the other side never funded all belong in the accounting.

Liability to outsiders

Co-venturers also share exposure to third parties. Under the partnership rules, all partners are generally jointly and severally liable for the obligations of the business. (Corp. Code, § 16306, subd. (a).) Each is an agent for its ordinary-course business and can bind it. (Corp. Code, § 16301, subd. (1).)

So a lender or contractor on the project may be able to pursue either venturer for the full amount. That risk is the main reason sophisticated parties put a project into an LLC before the first dollar is spent.

How a joint venture ends

Under the partnership statute, a venture for a particular undertaking is dissolved when the undertaking is completed, or earlier by the express will of all the venturers. (Corp. Code, § 16801, subd. (2)(B), (C).) The business is then wound up: the asset is sold or distributed, the debts are paid, and the remainder is divided.

Walking away mid-project is riskier. Depending on the agreement, an early exit can itself be a breach that offsets what the departing venturer is owed.

Our real estate litigation page covers the property side of these disputes.

What to bring to the first meeting

Bring the venture agreement, term sheet, or the emails that set the deal. Add the closing statements, loan documents, and title records for any property, plus whatever financial reports you have received. Include your own records of money and work contributed, and every request for information you sent with the response.

Frequently asked questions

We formed a joint venture with another company to develop a property and they are keeping the profits. What are our rights?

You have the rights of a partner in that project. California applies partnership law to joint ventures, so your co-venturer owes fiduciary duties of disclosure and must account for profits. You can demand the venture's books, sue for your share under the agreement, and seek an accounting. A constructive trust may be available if proceeds or title were taken in the other company's name.

What is the difference between a joint venture and a partnership?

Mostly scope. A joint venture is usually formed for a single transaction or project, while a partnership carries on a continuing business. The California Supreme Court has said that, legally, the two relationships are virtually the same, and courts apply partnership law to joint ventures when appropriate. Fiduciary duties, profit sharing, and liability to third parties work the same way.

Our joint venture agreement was never put in writing. Can we still prove it existed and enforce our share of the profits?

Yes, if the evidence supports it. A California joint venture may be formed orally or inferred from the parties' acts and declarations, and it is proved by a preponderance of the evidence. You must show a joint interest in a common undertaking, an understanding to share profits and losses, and a right of joint control. Emails, bank records, and tax filings usually carry the proof.

Are joint venturers liable for each other's debts?

For debts of the venture, generally yes. Because California applies partnership law to joint ventures, each venturer can be jointly and severally liable for obligations incurred in carrying out the common enterprise, and one venturer's ordinary-course acts can bind the others. That exposure is why many parties run a project through a limited liability company instead.

How does a joint venture end?

A venture formed for a particular undertaking ends when the undertaking is completed, or earlier if all the venturers agree. Under the California partnership statute that courts apply to joint ventures, the business is then wound up. When the venturers cannot agree on the final numbers, either one can sue for an accounting.

Talk to a California joint venture dispute attorney

If a co-venturer is withholding profits or information, or you have been accused of doing so, call (909) 235-6116 or contact us online. Kolmogorov Law, P.C. is located at 327 Magnet, Irvine, CA 92618, and represents companies and investors in Orange County, Los Angeles, and throughout California. Our partnership dispute practice page describes related work.

This page provides general information about California law and is not legal advice. Outcomes depend on the agreement, the conduct of the parties, and the court.