RPAPL Article 9: How a Partition Action Works — Procedure, Defenses, and Accounting Credits

When two or more people own New York real property together and cannot agree on what to do with it, Article 9 of the Real Property Actions and Proceedings Law (RPAPL §§ 901–993) supplies the exit. A partition action asks the Supreme Court to either physically divide the property among the co-owners (partition in kind) or, far more commonly with houses, condos, and city lots, order the property sold and the net proceeds divided according to each owner's share and equitable credits (partition by sale).

The core principle is simple: no one can be forced to remain a co-owner of real property against their will. Partition is a matter of right for a qualifying co-tenant, subject only to equitable defenses and, since 2019, the special protections for inherited "heirs property" under RPAPL § 993. This page explains who can bring the action, how the case actually proceeds, what defenses exist, and how the money is divided at the end — which is where most partition cases are really won or lost.

Who May Bring a Partition Action — RPAPL § 901

RPAPL § 901(1) permits a person who holds and is in possession of real property as a joint tenant or tenant in common to maintain an action for partition and, if partition in kind would cause great prejudice, for a sale. Courts interpret "possession" broadly: a co-tenant who has legal title but is not physically living at the property generally still has the constructive possession needed to sue, unless another co-tenant has ousted them (discussed below under defenses).

Typical plaintiffs include:

• Siblings who inherited a house from a parent and disagree about selling;
• Unmarried partners who bought a home together and have since separated (married couples generally divide property through matrimonial actions instead);
• Investors or friends who took title together and have reached a deadlock;
• A purchaser of one co-tenant's fractional interest.

If your name is not on the deed — for example, you paid toward the purchase but title was taken in someone else's name — you cannot bring partition directly. You would first need to establish an ownership interest, often through a constructive trust claim or a quiet title action, and partition can be pleaded alongside those claims.

Step-by-Step: The Procedure Under Article 9

1. Summons, complaint, and notice of pendency

The action is commenced in Supreme Court in the county where the property sits. RPAPL § 904 requires the complaint to describe the property and set forth the rights, shares, and interests of every party, so far as known. All co-owners and anyone with a lien or interest that could be affected (mortgagees, judgment creditors) should be joined or accounted for. A notice of pendency under CPLR § 6501 is filed against the property, which prevents a co-owner from selling or refinancing around the litigation.

2. Answer, counterclaims, and the RPAPL § 993 heirs-property screen

Defendants typically answer, assert their own version of the ownership shares, and plead claims for accounting credits. If the property qualifies as "heirs property" under RPAPL § 993 — broadly, property held by tenants in common where a significant share passed from relatives and there is no binding co-ownership agreement — the court must apply the Uniform Partition of Heirs Property Act procedures. That means a court-ordered appraisal, a statutory buyout right allowing non-petitioning co-tenants to purchase the petitioner's share at appraised value, and a preference for partition in kind or a broker-listed open-market sale instead of an auction. Families litigating inherited property should evaluate § 993 at the very first stage, because its deadlines for electing a buyout are short and unforgiving.

3. Determination of shares and the interlocutory judgment — RPAPL §§ 907, 915

Under RPAPL § 907, the court may appoint a referee to take proof of each party's title, share, and interest. The court then issues an interlocutory judgment under RPAPL § 915, which (a) declares each party's percentage interest, and (b) directs either physical partition or, where division cannot be made "without great prejudice to the owners," a sale. For a single-family house or an apartment, physical division is almost never feasible, so sale is the norm — but the plaintiff must still prove great prejudice; it is not automatic.

4. The accounting — RPAPL § 945

RPAPL § 945 authorizes the court, before final judgment, to ascertain amounts owed among the co-owners — for rents collected, carrying costs paid, and other adjustments. In practice this is usually referred to the referee and is the phase that determines who actually walks away with what.

5. Sale, final judgment, and distribution

If sale is ordered, a referee conducts it (by public auction unless § 993 requires an open-market listing). From gross proceeds the court pays sale expenses, then liens in order of priority — with liens against only one co-owner's interest charged solely against that owner's share — and then distributes net proceeds per the interlocutory judgment as adjusted by the accounting. Under RPAPL § 981, the costs and reasonable expenses of the action, potentially including plaintiff's counsel fees incurred for the common benefit, may be taxed against the proceeds before division.

Accounting Credits: How the Money Is Actually Divided

Percentage of title is only the starting point. New York courts routinely adjust distributions with credits and charges, typically including:

• Carrying charges: a co-tenant who paid more than their share of property taxes, mortgage principal and interest, insurance, and necessary repairs is generally entitled to a credit for the excess.
• Improvements: credited only to the extent they enhanced the value of the property, not for dollars spent.
• Rents collected: a co-tenant who collected rent from third parties must account to the others for their proportionate share.
• Use and occupancy: the general rule is that a co-tenant in exclusive possession owes no rent to the others absent an ouster. However, many courts offset the occupying co-tenant's carrying-charge credits by the value of their exclusive occupancy — meaning the resident co-owner who claims years of tax and mortgage credits may see those credits reduced or eliminated.
• Down payment and acquisition contributions: unequal contributions at purchase can support unequal shares or credits, depending on how title was taken and the parties' intent.

A worked example

Two siblings inherit a Queens house 50/50. Sibling A lives there for six years, paying $60,000 in taxes, insurance, and repairs; Sibling B pays nothing and lives elsewhere. The house sells for $800,000 net. A claims a $30,000 credit (half of the $60,000 carrying costs). B responds that A's exclusive occupancy was worth $2,500/month — $180,000 over six years — and asks the referee to offset A's credit against half that value. Depending on proof of ouster, market rent, and the necessity of the repairs, the final split can swing tens of thousands of dollars in either direction. This is why partition litigation is document-driven: keep every tax bill, canceled check, and repair invoice.

Defenses to a Partition Action

Although partition is a right, defendants are not without tools. Common defenses include:

• Plaintiff lacks a cognizable title interest — the threshold fight, sometimes requiring the court to resolve deed validity or constructive trust claims first.
• An agreement not to partition — co-ownership, operating, or family agreements waiving partition are generally enforceable if reasonable in duration.
• Equitable defenses — partition is an equitable remedy; unclean hands, fraud in acquiring the interest, or oppressive conduct can defeat or condition relief.
• Adverse possession / ouster — under RPAPL § 541, possession by one co-tenant is presumed non-adverse to the others for ten years; only after clear ouster and the running of the statutory period can an occupying co-tenant claim to have extinguished the plaintiff's interest.
• RPAPL § 993 buyout election — for heirs property, timely electing to buy out the petitioner at appraised value can stop a forced sale entirely.

Common pitfalls on both sides: failing to file the notice of pendency, ignoring the § 993 screen on inherited property, missing the buyout election deadline, and arriving at the accounting phase with no documentary proof of contributions. Practical guidance for owners on each side is available on our pages for bringing a partition of property claim and responding to a partition action.

You can contact us by phone at 212-233-1233 or by email at [email protected].