Co-tenancy is any arrangement in which two or more people hold title to the same property at the same time. In the United States, it takes three main forms: joint tenancy, tenancy in common, and tenancy by the entirety. The form you choose controls what happens when an owner dies, whether a creditor can force a sale, and whether a will has any say in where the property goes. One feature runs through all three: each co-owner has the right to use and occupy the entire property, no matter how small their share.
Joint Tenancy
Joint tenancy is defined by the right of survivorship. When one joint tenant dies, that share passes automatically to the surviving joint tenant or tenants, by operation of law. It skips probate and overrides the deceased owner’s will. If a parent and adult child own a house as joint tenants and the parent dies, the child becomes sole owner immediately, whatever the parent’s estate plan says.
Creating a joint tenancy requires four conditions, traditionally called the “four unities”:
- Time: all owners acquire their interests at the same moment.
- Title: all owners receive their interests through the same deed.
- Interest: every owner holds an equal share. Two joint tenants each own 50 percent; three each own a third.
- Possession: every owner has the right to use the whole property.
If any of these is missing or later destroyed, the joint tenancy fails and generally becomes a tenancy in common.1Legal Information Institute. Joint Tenancy To create one, the deed typically has to say so explicitly, using language like “as joint tenants with right of survivorship.” Without that wording, most states default to tenancy in common.
Tenancy in Common
Tenancy in common is the most flexible form. Owners can hold unequal shares, so one person might own 70 percent and another 30. The only unity required is possession: every owner can still use the whole property, not just a slice matching their percentage.2Legal Information Institute. Tenancy in Common
There is no survivorship. When a tenant in common dies, their share goes into their estate and passes under their will, or, if there is no will, under the state’s default inheritance rules. Surviving co-owners get nothing automatically. That makes tenancy in common a natural fit for business partners, friends, or relatives who want to leave their share to someone of their choosing.
It is also the default. When a deed transfers property to two or more people without specifying the form, courts generally treat the result as a tenancy in common.2Legal Information Institute. Tenancy in Common
Tenancy by the Entirety
Tenancy by the entirety is available only to married couples and is recognized in roughly half the states plus the District of Columbia. A handful of those jurisdictions extend it to domestic partners or common-law spouses. The concept treats the couple as a single legal unit rather than two separate owners.3Legal Information Institute. Tenancy by the Entirety
Like joint tenancy, it carries a right of survivorship: when one spouse dies, the other becomes sole owner without probate. But it also offers something joint tenancy does not. If only one spouse owes a debt, that spouse’s creditor generally cannot place a lien on, or force the sale of, property held as tenants by the entirety. The protection disappears when both spouses are liable for the same debt.
Creation requires the four unities plus a fifth, the unity of marriage. The couple must be legally married when they acquire the property. Some states presume that any property purchased by a married couple is held this way; others require the deed to say so explicitly.
Rights and Duties Between Co-Owners
Owning property together means sharing more than the deed. Co-owners have practical obligations toward each other that come up constantly in real life.
Equal Right to Occupy
Every co-owner can use the entire property. A 10 percent owner has the same right to walk through the front door as a 90 percent owner, and no co-owner can lock another out. When one does, the law calls it “ouster,” and the ousted co-owner can sue for wrongful ejectment. An ouster also usually triggers a duty to pay the excluded owner fair-market rent for the period of exclusion. Without an ouster, a co-owner living in the property alone generally owes nothing in rent to an absent co-owner who left voluntarily.
Sharing Income and Expenses
If one co-owner rents the property to a third party, the others are entitled to their proportionate share of the net proceeds. A 50/50 owner who leases the place for $2,000 a month owes the other owner $1,000 a month after necessary expenses. Co-owners who pay more than their share of property taxes, insurance, or essential repairs can seek reimbursement from the others, either by agreement or in a partition proceeding. Improvements are treated differently from necessary repairs, and reimbursement is often capped at the lesser of actual cost or the value the improvement added to the property.
How Creditors Reach Co-Owned Property
The form of co-tenancy you hold dramatically affects your exposure to a co-owner’s debts.
A creditor of a tenant in common can attach a lien to that owner’s share and, in many jurisdictions, force a sale of the entire property through a partition action. The non-debtor co-owners receive their proportionate share of the sale proceeds, but they lose the property. Joint tenancy works similarly: a creditor can reach the debtor’s interest, and doing so typically severs the joint tenancy, converting it into a tenancy in common and destroying the right of survivorship.
Tenancy by the entirety provides the strongest shield. Because the couple is treated as a single owner, a creditor of only one spouse generally cannot touch the property. The main exception is federal tax liens. In United States v. Craft, the Supreme Court held that a federal tax lien attaches to a debtor-spouse’s interest in entirety property regardless of state-law protections.4Legal Information Institute. United States v Craft In bankruptcy, a debtor who holds entirety property may be able to exempt that interest from the bankruptcy estate, but only to the extent state law protects it from creditors outside bankruptcy.5Office of the Law Revision Counsel. 11 USC 522 – Exemptions
Tax Consequences Worth Knowing
The co-tenancy form you choose carries tax effects that catch many people off guard. Two matter most: gift tax when you add someone to the title, and the basis adjustment when an owner dies.
Gift Tax When Adding a Co-Owner
Adding someone to the title of your home generally creates an immediate taxable gift equal to the value of the share you gave away. Add your adult child as a 50 percent joint tenant on a $400,000 house and you have made a $200,000 gift. That exceeds the annual gift tax exclusion, so you would need to file a gift tax return, even if no tax is owed because you apply part of your lifetime exemption. Bank accounts are different: adding a joint owner to a bank account is not a reportable gift until the other person withdraws funds for their own use.
Step-Up in Basis at Death
When a property owner dies, the tax basis of that owner’s share generally resets to fair market value at death, which can erase years of built-up capital gains. How much of the property gets this step-up depends on the ownership form. For a qualified joint interest between spouses, half the property is included in the deceased spouse’s estate, and the survivor’s new basis equals their original basis in their half plus the fair market value of the decedent’s half.6Internal Revenue Service. Publication 559 (2025), Survivors, Executors, and Administrators
With a tenancy in common, only the deceased owner’s percentage receives the step-up. If you and a friend each own 50 percent and the friend dies, the friend’s half gets a new basis at fair market value, but your half keeps its original basis. Community property states offer a full step-up on the entire property, which is a meaningful advantage over joint tenancy for spouses in those states. The wrong ownership choice can cost tens of thousands in unnecessary capital gains tax when the surviving owner eventually sells.7Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent
Ending a Co-Tenancy
Each form has its own rules for how it can be dissolved.
Severing a Joint Tenancy
Any joint tenant can unilaterally destroy the joint tenancy by conveying their share to a third party. The conveyance breaks the unities of time and title, converting the relationship into a tenancy in common and eliminating the right of survivorship. The other joint tenants do not need to agree or even know. If three people hold property as joint tenants and one sells their share to an outsider, the outsider becomes a tenant in common with the remaining two, who continue to hold their shares as joint tenants with respect to each other.1Legal Information Institute. Joint Tenancy
Partition Actions
Any tenant in common or joint tenant can file a partition action to force a division of the property. If physical division is fair and workable, the court will split it. If not, which is the usual outcome with a house, the court orders a sale and distributes the proceeds by share.8Legal Information Institute. Partition The right to partition is nearly absolute and generally cannot be permanently waived, so a stubborn co-owner cannot hold the others hostage indefinitely.
Ending Tenancy by the Entirety
Tenancy by the entirety is the hardest to unwind. Neither spouse can sever it alone. It ends only through the death of one spouse, divorce, or mutual agreement to change the ownership form. In most states, divorce automatically converts the tenancy by the entirety into a tenancy in common, stripping away both the survivorship right and the creditor protection.
Choosing the Right Form
The best form depends on who the co-owners are and what they want to happen to the property.
- Married couples in a state that recognizes it usually benefit from tenancy by the entirety. The creditor protection alone makes it worth considering, and the automatic survivorship keeps the home with the surviving spouse without probate.
- Unmarried partners or relatives who want the survivor to inherit often choose joint tenancy. It avoids probate and provides a clean transfer at death. Keep in mind that any joint tenant can sever the arrangement without the other’s consent, and the right of survivorship overrides your will.
- Business partners, investors, or co-owners who want flexibility usually prefer tenancy in common. They can hold unequal shares, sell or mortgage their share independently, and leave their share to anyone they choose. The trade-off is no survivorship, no creditor shield, and probate at death.
Two mistakes come up constantly. One is adding a child or partner to a deed as a joint tenant without thinking through the gift tax, the loss of control, or the partial step-up in basis being locked in. The other is assuming a will controls what happens to the property when a joint tenancy or tenancy by the entirety is already in place. The deed wins that conflict every time.