Part ownership works by giving two or more people a legal interest in the same asset — most commonly real estate — where each owner holds a claim to the whole property rather than a specific piece of it. What separates one co-ownership arrangement from another is the structure written into the deed. That structure decides who inherits a share when an owner dies, whether a creditor can reach the property, how expenses get split, and what happens when someone wants out. Pick the wrong form and you can trigger unexpected tax bills, expose the property to a co-owner’s creditors, or send your share through probate when you intended otherwise.
The Four Ways Co-Owners Hold Title
Four structures dominate. Each treats inheritance, creditor exposure, and the right to sell differently, and the choice is usually made at the moment the deed is signed.
Tenancy in Common
This is the most flexible form and the default in most states when a deed doesn’t say otherwise. Owners can hold unequal shares. One person might own 70% while another owns 30%, and those percentages can reflect what each contributed to the purchase. When a tenant in common dies, their share becomes part of their estate and passes through their will, or through state intestacy rules if there is no will. The surviving co-owners inherit nothing automatically, which gives each owner control over who ultimately receives their share but also means every co-owner’s interest can get tied up in probate.
Joint Tenancy With Right of Survivorship
Joint tenancy requires equal shares. Two owners each hold 50%; three each hold a third. When one joint tenant dies, that share passes automatically to the surviving owners outside of probate. This survivorship right overrides whatever the deceased owner’s will says about the property, which surprises heirs more often than you’d expect. The deed has to explicitly state the intent to create a joint tenancy. If it doesn’t, most states will treat the arrangement as a tenancy in common by default.
A joint tenancy can also be broken without the other owners’ consent. Any joint tenant can sever the arrangement by transferring their interest to someone else, or even back to themselves through a new deed. Once severed, that share converts to a tenancy in common and the right of survivorship no longer applies to it.
Tenancy by the Entirety
Roughly half the states and the District of Columbia recognize tenancy by the entirety, which is available only to married couples, and in a few states to registered domestic partners. It works like joint tenancy in that the surviving spouse automatically inherits the property, but it adds a protective layer: neither spouse can sell, transfer, or encumber their interest without the other’s consent. In many recognizing states, a creditor with a judgment against only one spouse cannot force a sale of the property or attach a lien to it. That protection disappears on divorce, which typically converts the ownership to a tenancy in common.
Community Property
Nine states follow community property rules: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. These states treat most assets acquired during a marriage as equally owned by both spouses regardless of who earned the income or whose name is on the title.1Internal Revenue Service. Publication 555, Community Property Some of these states also let couples add a right of survivorship to community property so the surviving spouse inherits without probate. The tax advantage of community property shows up at death and is discussed below.
What Each Co-Owner Can and Can’t Do
No matter how small your share, you have a legal right to use and occupy the entire property. A person who owns 10% of a home can walk through the front door and live there just as freely as the person who owns 90%. Co-owners can’t lock each other out or restrict access without a written agreement or a court order.
There is a limit to that, though. If one co-owner physically excludes another by changing the locks, refusing entry, or treating the property as their own, the excluded owner can bring a claim for what’s called an ouster. Where a court finds an ouster occurred, the occupying co-owner typically owes the excluded owner a proportional share of the property’s fair rental value for the period of exclusion. Without an ouster, a co-owner who simply chooses not to use the property generally can’t demand rent from the one who does.
Splitting the Bills
Financial obligations follow ownership percentages. Own 40% and you’re expected to cover 40% of the property taxes, insurance, and maintenance needed to preserve the property’s value. The same ratio applies to income: if the property generates rent, each owner is entitled to a proportional share. When a co-owner refuses to pay their portion of necessary expenses, the others can seek reimbursement, often as part of a partition action or an accounting claim.
Repairs and improvements are treated differently. Courts draw a sharp line between necessary repairs that preserve the property, like fixing a leaking roof or replacing a failing furnace, and optional improvements that just make it nicer. A co-owner who pays for genuinely necessary repairs can usually recover a proportional share from the others. A co-owner who installs a swimming pool or renovates a kitchen without the others’ agreement will have a much harder time. Courts tend to deny contribution for improvements that are cosmetic, extravagant, or made without the other owners’ knowledge.
Everyone’s on the Hook for the Mortgage
When co-owners take out a mortgage together, every borrower on the loan is fully liable for the entire debt, not just their ownership percentage. If one co-owner stops paying, the lender can pursue any of the others for the full balance. A default can lead to foreclosure of the entire property, and if the sale price doesn’t cover what’s owed, the lender may seek a deficiency judgment against any or all of the co-borrowers, depending on state law. This is one of the biggest practical risks of co-ownership.
Tax Consequences
Co-ownership creates federal tax situations that people routinely overlook until a bill lands. Three come up most often.
Adding Someone to a Deed Is a Gift
Putting someone new on your deed transfers a property interest, and the IRS treats that as a gift. If the value of the transferred interest is above the annual gift tax exclusion — $19,000 per recipient for 2026 — you need to file a gift tax return on Form 709.2Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Filing doesn’t necessarily mean you owe tax, since the lifetime gift and estate tax exemption shelters most people, but skipping the return altogether can create problems later.3Internal Revenue Service. Gifts and Inheritances Transfers between spouses are generally exempt from gift tax entirely.
Capital Gains When You Sell
Each co-owner who uses the property as a primary residence can exclude up to $250,000 of gain from a sale, provided they owned and lived in the home for at least two of the five years before the sale.4Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence A married couple filing jointly can exclude up to $500,000 if at least one spouse meets the ownership requirement and both meet the use requirement. Co-owners who don’t live in the property, such as investment partners, don’t qualify for this exclusion and owe capital gains tax on their share of the profit.
Stepped-Up Basis at Death
When a co-owner dies, the tax basis of their share generally resets to the property’s fair market value on the date of death.5Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent For a joint tenancy between spouses, only the deceased spouse’s half gets that stepped-up basis. The surviving spouse’s half keeps its original basis. Community property gets a bigger break: both halves qualify for the step-up, which can substantially reduce capital gains taxes if the surviving spouse later sells. That single tax difference leads many estate planners in community property states to favor community property titling over joint tenancy.
How Creditors Reach Co-Owned Property
One co-owner’s debt problem can become every co-owner’s problem. When a creditor obtains a court judgment against a single owner, the resulting lien can attach to that person’s ownership interest. In most states the lien doesn’t give the creditor the right to force the other owners out, but it clouds the title and complicates any future sale.
The IRS operates on tougher terms. A federal tax lien against one co-owner attaches to that person’s interest, and the IRS can ask a court to order the sale of the entire property, even if the other owners owe nothing.6Internal Revenue Service. 5.17.2 Federal Tax Liens The non-liable co-owners have to be compensated from the sale proceeds for the value of their shares, but they lose the property just the same. This can apply to tenancies in common, joint tenancies, and in some circumstances even tenancy by the entirety.
Tenancy by the entirety offers the strongest creditor protection of the four ownership types. In states that recognize it, a judgment against only one spouse generally can’t attach to property held this way. That shield falls away if both spouses owe the debt or if the couple divorces.
Getting Out of a Co-Ownership
Co-ownership doesn’t have to be permanent, and the law gives you exits depending on how cooperative everyone is willing to be.
The simplest is a voluntary sale or buyout. One owner sells their share to the others or to an outside buyer. If the co-ownership agreement includes a right of first refusal, the existing owners get first crack at matching any outside offer. Without that clause, a tenant in common can sell to anyone, which is how strangers sometimes end up sharing property with people they’ve never met. A joint tenant can also sell, but the sale severs the joint tenancy as to that share and converts the buyer’s interest into a tenancy in common with the remaining owners.
When co-owners can’t agree on whether or how to sell, any owner can file a partition action. The court first considers whether the property can be physically divided into separate parcels without destroying its value. That’s realistic for large tracts of undeveloped land and rarely practical for a single house on a residential lot. When physical division isn’t feasible, the court orders a partition by sale, and the proceeds are split among the owners according to their shares. Partition lawsuits are expensive and slow.
Put It in Writing Before You Need To
The deed establishes who owns what. It says nothing about how the owners will actually manage the property, and skipping a separate co-ownership agreement is the single most common mistake co-owners make. These agreements aren’t legally required, but drafting one costs a fraction of what litigating a dispute costs.
A solid agreement should spell out how predictable costs like taxes, insurance, and utilities get split, and how unexpected repairs above a set dollar threshold get approved. It should set usage rules, including who uses the property when, whether guests are allowed, and whether an owner can rent out unused time. It should describe how decisions get made, whether votes are weighted by ownership percentage or one per person, what counts as a minor decision versus one needing group approval, and how ties are broken. A right of first refusal gives existing co-owners the first chance to buy a departing owner’s share before it goes to an outsider, along with a method for determining fair market value at that time. An exit strategy lays out the process for a voluntary sale, how a buyout price is set (independent appraisal, agreed formula, or both), and a timeline for closing. A dispute-resolution clause requiring mediation or arbitration before any lawsuit can save everyone significant time and legal fees. And the agreement should address what happens if a co-owner dies or becomes unable to participate, including whether life insurance should fund a buyout.
The exit strategy is the clause people most often leave out and most often regret. Divorce, job loss, retirement — one of these eventually makes it likely that a co-owner will want out. Having the mechanics already written down keeps that moment from becoming a crisis.