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Cotenant Accounting

Cotenant Accounting Claims in California Partition Actions

By Elliott H. Stone, Managing Partner, Stone LLP · Updated September 3, 2026

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Before a California court divides the proceeds of a partition sale, it adjusts each co-owner’s share for what they put in and took out of the property, mortgage payments, taxes, insurance, and necessary repairs on one side, and rent collected or the value of exclusive use on the other. This power comes from Code of Civil Procedure § 872.140, which lets the court "order allowance, accounting, contribution, or other compensatory adjustment among the parties according to the principles of equity."

Why the accounting usually matters more than the sale

Most co-owners already expect the property to sell once a partition action is filed. What they don’t expect is how much the final numbers can move based on years of unequal financial contributions. A co-owner who quietly covered the mortgage for a decade, or who collected rent from a tenant without sharing it, can significantly change the final split, sometimes by a larger amount than either side anticipated going into the case.

What counts as a credit

The Court of Appeal in Wallace v. Daley (1990) 220 Cal.App.3d 1028, 1035–36 described the rule this way: "Every partition action includes a final accounting according to the principles of equity for both charges and credits upon each cotenant’s interest. Credits include expenditures in excess of the cotenant’s fractional share for necessary repairs, improvements that enhance the value of the property, taxes, payments of principal and interest on mortgages, and other liens, insurance for the common benefit, and protection and preservation of title." A cotenant who paid a disproportionate share of the original purchase price is also generally entitled to reimbursement for that disproportion, independent of ongoing carrying costs (Milian v. De Leon (1986) 181 Cal.App.3d 1185, 1195).

What counts as a charge against a co-owner

The flip side of the accounting is charging a co-owner for the benefit they received from exclusive use of the property. A co-owner who lived in the house alone, or who rented it out and kept the proceeds, can generally be charged the fair rental value of that use, offsetting whatever credits they are claiming for carrying costs. Courts refer to a cotenant who wrongfully excludes another from possession as having committed an "ouster," which can affect both the accounting and, in some circumstances, the statute of limitations analysis for related claims.

Documentation wins accounting disputes

Because the accounting turns on years of financial history, the co-owner with better records, mortgage statements, tax bills, receipts for repairs, bank records showing rent collected, generally does better than the co-owner relying on memory or estimates. Gathering this documentation early, before a case is filed, is one of the most concretely useful things a co-owner considering partition can do.

For the full walkthrough of how a California partition action works, including the four stages, the accounting rules, and the limited ways to stop one, see our main guide, Partition Actions in California.

Frequently asked questions

Do I need to file a separate lawsuit to get an accounting, or is it part of the partition case?

The accounting is generally litigated as part of the same partition action, under the court’s equitable authority in Code Civ. Proc. § 872.140, rather than as a separate lawsuit.

Can I recover money for repairs I made without telling my co-owner first?

Necessary repairs that preserved or increased the property’s value are generally recoverable as a credit in the accounting, though the court has discretion in weighing whether an expenditure was truly necessary, and unreasonable delay in raising the claim can expose it to a laches defense.

What if my co-owner never lived in the property or collected any rent, is there still an accounting?

Even without exclusive possession or rental income on either side, an accounting is still relevant whenever one co- owner paid more than their proportionate share of the mortgage, taxes, insurance, or necessary repairs.

This page is provided for general informational purposes and does not constitute legal advice. Partition matters turn on title, the governing documents, and the specific facts. No attorney-client relationship is created by reading this page.

Talk to Stone LLP about a co-ownership dispute

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