Breach of a Partnership Agreement in California

Last updated: November 2026

A breach of a partnership agreement in California is a contract claim: one partner failed to do what the agreement required, and another partner or the partnership was harmed. The agreement governs the relations among partners, and where it is silent the Corporations Code fills the gap. (Corp. Code, § 16103, subd. (a).) A partner may sue to enforce it directly. (Corp. Code, § 16405, subd. (b)(1).) Kolmogorov Law, P.C. litigates these claims for partners in Orange County, Los Angeles, and across California.

Call (909) 235-6116 or contact us online to discuss a partner who is not honoring the agreement.

What counts as a partnership agreement

The agreement does not have to be a signed, lawyer-drafted document. It can be written, oral, or implied from how the partners actually ran the business. A term sheet, a string of emails, or a course of dealing over several years can all supply enforceable terms.

That cuts both ways. A partner who insists the "real deal" was different from the written agreement has to prove it, and a signed agreement with an integration clause makes that difficult.

The terms that get breached most

Capital contributions. A partner promises to fund a stated amount and funds part of it, or stops contributing when the business hits trouble.

Distributions. The agreement sets a distribution formula, and the managing partner pays himself first, pays late, or does not pay at all. Without an agreed formula, each partner is entitled to an equal share of profits. (Corp. Code, § 16401, subd. (b).)

Management and voting. The agreement requires a majority or unanimous vote for certain decisions, and one partner acts alone. The default rule is that ordinary-course differences are decided by a majority of the partners, and an act outside the ordinary course requires the consent of all of them. (Corp. Code, § 16401, subd. (j).)

Compensation. A partner draws a salary the agreement never authorized. By default a partner is not entitled to pay for services, except reasonable compensation for winding up. (Corp. Code, § 16401, subd. (h).)

Withdrawal and buyout. A partner leaves in a way the agreement prohibits, or the remaining partners refuse to pay the buyout the agreement promised. Dissociation in breach of an express provision of the agreement is wrongful, and the wrongfully dissociating partner is liable for the damages it causes. (Corp. Code, § 16602, subds. (b)(1), (c).)

What the agreement cannot change

Partners have wide freedom to write their own rules, but the statute draws a few lines. The agreement may not unreasonably restrict a partner's access to the books and records or the right to be furnished with information. (Corp. Code, § 16103, subd. (b)(2).) It may not eliminate the duty of loyalty, though it can identify specific activities that do not violate it and can allow the partners to ratify a transaction after full disclosure. (Corp. Code, § 16103, subd. (b)(3).) It cannot take away the court's power to expel a partner for the statutory grounds, or the requirement to wind up in the cases the statute specifies. (Corp. Code, § 16103, subd. (b)(7), (8).)

So when a partner points to a clause that purports to let him hide the ledger or compete freely with the partnership, the clause may be unenforceable. The conduct may also be a breach of fiduciary duty on top of any contract claim.

Proving a breach of partnership agreement

The elements are the ordinary contract elements: an agreement, your performance or an excuse for not performing, the other partner's breach, and resulting harm. The partnership-specific work is establishing what the agreement actually said, which in an informal partnership means reconstructing it from conduct, tax returns, and correspondence. Then comes separating the contract claim from the fiduciary claim, because the same act is usually both.

Access to the books is where the case is made or lost. A partnership must give partners and their attorneys access to its books and records, and must furnish information reasonably required for a partner to exercise his rights, without being asked. (Corp. Code, § 16403, subds. (b), (c)(1).) We use that right early.

Deadlines

An action on a written partnership agreement must be filed within four years of the breach. (Code Civ. Proc., § 337, subd. (a).) An oral agreement gets two years. (Code Civ. Proc., § 339, subd. 1.)

Remedies

Damages measured by what the partner would have received had the agreement been performed. Specific performance where money is not adequate, such as an order to transfer an interest. An accounting. Where the agreement has a fee clause, the prevailing party recovers attorney fees, and the clause applies to both sides under Civil Code section 1717.

Beyond contract damages, the court can expel a partner who willfully or persistently committed a material breach of the agreement. (Corp. Code, § 16601, par. (5)(B).) And it can dissolve the partnership when it is not reasonably practicable to carry on the business in conformity with the agreement. (Corp. Code, § 16801, par. (5)(C).) Our page on removing a partner covers the expulsion route, and the partnership buyouts page covers the negotiated exit.

Common defenses

The other side breached first, and that excused performance. The partners amended the agreement by conduct and the clause no longer applies. The plaintiff knew about the conduct for years and ratified it by accepting distributions. The agreement requires arbitration or mediation before suit. The claim is time-barred. Each of these is a factual question, and the documents usually decide it.

Where these cases are heard

Partnership agreement claims are filed in the Superior Court where the partnership does business: the Central Justice Center in Santa Ana for Orange County partnerships, the Stanley Mosk Courthouse in Los Angeles. An arbitration clause sends the case to a private arbitrator instead.

What to bring to the first meeting

Every version of the partnership agreement, signed or not. Tax returns and K-1s for the years in dispute. Capital account statements. The communications that show the breach and your objection to it. A list of any distributions or payments you received after you learned of the problem, since those bear on waiver.

Frequently asked questions

What is a breach of partnership agreement?

A partner's failure to perform an obligation the agreement imposes, such as contributing capital, paying distributions, obtaining a required vote, or honoring a buyout. Where the agreement is silent, the Corporations Code supplies the obligation, and a partner can breach a statutory default rule the partners never discussed. (Corp. Code, § 16103, subd. (a).)

Can I sue for breach of an oral partnership agreement?

Yes, but the deadline is two years rather than four, and you must prove the terms from conduct and correspondence rather than a document. (Code Civ. Proc., § 339, subd. 1.) The first dispute is often whether a partnership existed at all. See can I sue my business partner.

Is a partnership agreement violation also a breach of fiduciary duty?

Often. The same conduct, such as diverting partnership money or a partnership opportunity, violates the agreement and the statutory duty of loyalty at the same time. (Corp. Code, § 16404, subd. (b).) Pleading both matters because the remedies differ: disgorgement and a constructive trust are available on the fiduciary claim but not on the contract claim alone.

Does the agreement's fee clause apply if I lose?

Yes. California treats a one-sided fee clause as reciprocal, so the prevailing party recovers fees whichever side wrote the clause. That risk is part of the calculus before filing.

What if my partner says the agreement was amended?

Amendments to a partnership agreement require the consent of all partners under the default rule. (Corp. Code, § 16401, subd. (j).) A written agreement that requires signed amendments is hard to amend by conduct, though a long course of contrary dealing can support a waiver argument.

Talk to a California partnership dispute attorney

If a partner is not honoring your agreement, call (909) 235-6116 or contact us online. Kolmogorov Law, P.C. is at 327 Magnet, Irvine, CA 92618, and represents partners in Orange County, Los Angeles, and throughout California. See also our partnership dispute attorney page, the breach of contract hub, and our page on breach of an LLC operating agreement.

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