Property Settlement Agreement When Not Married: Enforceability and Taxes

When an unmarried couple separates, a property settlement agreement is the written contract they use to divide assets, debts, and financial responsibilities between them. Because unmarried partners who are not married have no automatic right to each other’s property under divorce law, this agreement is often the only reliable way to reach a fair split. The default rule in most states is that each person keeps whatever is titled in their name, regardless of what the other partner contributed.¹

Why the Default Rule Can Produce Unfair Results

Family courts divide marital property under community-property or equitable-distribution statutes when married couples divorce. Unmarried couples get none of that machinery. Their disputes land in civil court as contract or business matters rather than family law.²

That matters because the default can be harsh. One partner may have paid years of mortgage payments on a home titled in the other’s name, or sacrificed a career to manage the household. Without a written agreement or a successful legal claim, the contributing partner can walk away with nothing. The settlement agreement exists to replace that default with terms the couple negotiates themselves.

What the Agreement Should Cover

There is no standardized form. Each agreement is written for the couple’s actual situation.³ A thorough one usually addresses:

Division of property and assets, including real estate, vehicles, bank accounts, investments, and personal property. For jointly owned items, the agreement should say how they will be divided or whether one partner will buy out the other.
Debt allocation for mortgages, credit cards, and loans taken during the relationship.
Financial support, if any. There is no automatic right to post-separation support between unmarried partners; it exists only if the parties contract for it.¹
Real estate logistics: who stays in a shared home, timelines for moving out, and whether a jointly owned property will be sold, refinanced, or bought out by one partner.
A dispute resolution process, such as mediation or arbitration, to handle later disagreements without litigation.

Child custody and child support sit outside this contract. Those issues are handled in family court based on the child’s best interests and legal parentage, regardless of whether the parents were married.²

What Makes the Agreement Enforceable

Put it in writing. Some states will enforce oral agreements between unmarried partners, but proving the terms of a verbal deal in court is extremely difficult, and several states require a writing by statute.²

Beyond the writing itself, a sound agreement meets a few standards:

Both partners disclose their assets, debts, and income. Hidden assets undermine enforceability later.
Each partner has independent legal counsel review the agreement. In New Jersey this is not optional: state law requires that both parties receive independent legal advice for a cohabitation support agreement to be enforceable. Elsewhere, separate counsel still strengthens the agreement against later challenges.⁴
The terms are specific. Vague language invites disputes; identify assets, state dollar amounts or percentage splits, and set clear timelines.
The consideration is lawful. Courts following Marvin v. Marvin will not enforce a contract where sexual services are an inseparable part of the bargain.⁵

How Real Estate Title Changes the Stakes

Title matters more for unmarried couples than for married ones, whose property is subject to statutory division regardless of whose name is on the deed.

The two common forms of co-ownership are joint tenancy and tenancy in common. Joint tenancy gives both owners equal shares with a right of survivorship, so if one partner dies the other automatically inherits the property. Tenancy in common allows unequal shares and has no survivorship right; a deceased owner’s share passes through their estate.⁶ In many states, tenancy in common is the default for unmarried co-owners, and the deed must explicitly state “joint tenants with right of survivorship” to create a joint tenancy.³

If only one partner’s name is on the title, the property is generally treated as that person’s alone. The other partner may still have a claim based on financial contributions, but proving it without a written agreement is an uphill fight.⁶ A property settlement agreement can override these title-based defaults by specifying a different division of equity, a buyout arrangement, or a plan to sell and split the proceeds.

Tax Consequences of Transfers Between Partners

Taxes are one of the sharpest disadvantages unmarried couples face at separation. Property transfers between divorcing spouses are tax-free under Internal Revenue Code Section 1041. That protection does not extend to unmarried partners, registered domestic partners, or civil union partners; the IRS treats them as “tax strangers.”⁷

The consequences add up quickly. A transfer from one partner to another may be treated as a taxable gift if it exceeds the annual exclusion. If appreciated property is transferred in exchange for other assets or the release of claims, the IRS may treat it as a taxable sale and trigger capital gains for the transferring partner.⁷ There is a narrow exception: partitioning jointly owned property, where two co-owners simply divide what they already own together, is generally not a taxable event.⁸

In Reynolds v. Commissioner (1999), the U.S. Tax Court held that settlement payments received after a 24-year cohabitation were not taxable income, characterizing them as analogous to a nontaxable divorce settlement.⁹ Still, authoritative IRS guidance is thin, and taxpayers and advisors often reach inconsistent conclusions.⁷ Talk to a tax professional before signing.

What Happens Without an Agreement

When unmarried partners separate without a written agreement, the contributing partner isn’t necessarily empty-handed. The available claims are just more uncertain and more expensive to pursue than enforcing a contract would be.

Express and Implied Contract Claims

The 1976 California Supreme Court decision in Marvin v. Marvin established the modern framework. The court held that unmarried adults are fully competent to contract with each other about their property and earnings, and that courts should enforce both express and implied agreements between them. Where no express agreement exists, courts may examine the couple’s conduct to find an implied contract, partnership, joint venture, or other understanding. The line is drawn only at agreements explicitly founded on sexual services as the sole consideration.⁵

Unjust Enrichment and Equitable Remedies

When no contract exists at all, some courts allow equitable claims like unjust enrichment, constructive trust, and quantum meruit. The theory is that if one partner was enriched at the other’s expense, it would be unjust to let them keep the benefit without compensation. Historically courts were hostile to these claims, viewing nonmarital relationships as immoral; modern courts have largely moved past that reasoning, though success remains difficult.¹⁰

Section 28 of the Restatement (Third) of Restitution and Unjust Enrichment, published in 2011, endorses recovery between partners in a marriage-like relationship, though commentators have criticized its treatment of domestic labor like cooking, cleaning, and childcare.¹¹ The Vermont Supreme Court adopted Section 28 in Wynkoop v. Stratthaus (2016), allowing recovery for “sweat equity” put into a residence.¹²

One of the few reported wins for domestic labor is Turner v. Freed (2003) in Indiana. Angela Freed and Danny Turner lived together about ten years, during which Freed handled cooking, cleaning, laundry, and childcare while Turner built his business. The Indiana Court of Appeals upheld an $18,000 award to Freed, rejecting the argument that domestic services during cohabitation should be presumed free. The court noted it would be unjust for Turner to deny Freed the protections of marriage while claiming the spousal presumption that household services are a gift.¹³

Partition for Jointly Owned Real Estate

When both names are on the deed and the owners can’t agree what to do with the property, either co-owner can file a partition action in civil court. The court can either physically divide the property (rare for a house or condo) or order a sale and divide the proceeds.¹⁴

Typically the court appoints appraisers or commissioners to value the property. Either party can elect to buy out the other at the appraised value. If no one buys out the other, the court orders a sale, sometimes at public auction, and distributes the proceeds by ownership share. Courts can adjust those shares based on evidence that one partner paid more toward the mortgage, taxes, or improvements.¹⁵ Filing a partition action often brings an uncooperative co-owner to the table, and many of these cases settle before a court-ordered sale.¹⁴

State Variations That Change the Analysis

Where the couple lives can change everything about how these disputes play out.

States That Require a Writing

Several states have anti-palimony statutes that require written agreements between unmarried cohabitants. Texas amended its Statute of Frauds in 1987 to require written agreements for any promise made in consideration of nonmarital cohabitation.¹⁶ Minnesota’s Chapter 513 similarly requires written contracts for property and financial agreements between cohabitants.¹⁷ New Jersey’s 2010 amendment went further, requiring a writing signed by the paying party and that both partners received independent legal advice.¹⁸ In those states, oral agreements are unenforceable no matter how clear.

Common-Law Marriage States

A handful of states still recognize common-law marriage, which can change the analysis entirely. If a couple qualifies as common-law married, they are treated like any other married couple for property division and must get a formal divorce to end the relationship. States currently recognizing common-law marriage include Colorado, Iowa, Kansas, Montana, New Hampshire, Oklahoma, Rhode Island, South Carolina, Texas, and Utah.¹⁹ The requirements vary but generally involve agreeing to be married, living together, and publicly holding yourselves out as a married couple.²⁰

Registered Domestic Partnerships

Some states offer a middle ground. In California, registered domestic partners have nearly all the same state-level rights as married spouses, including property division protections under family law.²¹ Those rights do not extend to federal law, so registered partners are still treated as unmarried for federal tax purposes.²² Couples who are only living together without registering with the state do not get these protections.

1
FindLaw. Cohabitation Property Rights for Unmarried Couples
2
Nolo. Property and Finance When Living Together
3
People’s Law Library of Maryland. Unmarried Cohabitants Right to Support and Property
4
Dillon and Durling LLC. Palimony and Cohabitation Agreements
5
Justia. Marvin v. Marvin, 18 Cal. 3d 660
6
LawInfo. Unmarried Couples and Property Basics
7
Washington University Law Review. Taxation of Unmarried Partners
8
LGBTQ+ Bar Association. Taxation of Property Divisions at Dissolution of Nonmarital Relationships
9
SouthCoast Today. Settlement With Former Companion Is Not Taxable
10
Michigan Law Review. Unmarried Couples and Unjust Enrichment From Status to Contract and Back Again
11
American University Washington College of Law. Cohabitation and the Restatement (Third) of Restitution and Unjust Enrichment
12
American Law Institute. Institute Courts State Supreme Courts Adopt Sections of the Restatement
13
FindLaw. Turner v. Freed, 792 N.E.2d 947
14
Joseph and Joseph. Breaking Up Is Hard to Do Especially If You Own Real Estate Together and Aren’t Married
15
Smith Debnam. Buying Together Not Married Have You Considered Your Options
16
American Academy of Matrimonial Lawyers. Palimony Claims After Marvin v. Marvin
17
Minnesota Office of the Revisor of Statutes. Chapter 513 Agreements Relating to Property
18
New Jersey Law Journal. Palimony Comes Under the Statute of Frauds
19
National Conference of State Legislatures. Common-Law Marriage by State
20
Texas State Law Library. Common-Law Marriage in Texas
21
California Secretary of State. Domestic Partners Registry FAQ
22
Justia. Domestic Partners and Unmarried Couples