To co-own a house well, you need three things lined up before closing: the right form of legal title for your situation, deed language that actually reflects it, and a written co-ownership agreement covering money, decisions, and how anyone leaves. Miss any of the three and you’re negotiating from scratch the first time something goes wrong, which is usually the worst moment to start.
The choices below are the ones that shape everything else.
Pick the Ownership Structure That Fits Your Situation
Co-owned property is held in one of three legal forms. They differ most at the moments that matter: a death, a split, a lawsuit against one owner.
Tenancy in Common
This is the default in most states when two or more people buy together. Each owner holds a separate share that can be unequal — a 70/30 split is fine — and every owner has the right to use the whole property regardless of percentage. There is no right of survivorship. When an owner dies, that share passes through their will or estate rather than to the other co-owners.1Legal Information Institute. Tenancy in Common The share may go through probate, and whoever inherits becomes your new co-owner.
Tenancy in common fits co-buyers contributing unequal amounts, investment partners, or anyone who wants their share to go to a specific heir rather than to the other owners.
Joint Tenancy With Right of Survivorship
Joint tenancy requires equal shares. Two owners each hold exactly 50%. When one dies, that share transfers automatically to the survivors, skipping probate. That right of survivorship is the whole point of choosing it.
A valid joint tenancy requires the “four unities”: all owners must take their interest at the same time, through the same document, in equal shares, with equal rights to use the whole property.1Legal Information Institute. Tenancy in Common Miss any one, and most states treat the ownership as tenancy in common instead.
Something people don’t realize: any joint tenant can sever the joint tenancy on their own by transferring their interest, even to themselves through a new deed. Once severed, ownership converts to tenancy in common and the survivorship right is gone. It can happen without the other owner’s knowledge, though a new deed has to be recorded.
Tenancy by the Entirety
This form is available only to married couples, and only in roughly half the states plus the District of Columbia. It carries a right of survivorship like joint tenancy — the surviving spouse inherits automatically.2Legal Information Institute. Tenancy by the Entirety Some states extend it to domestic partners or common-law spouses.
What it adds over ordinary joint tenancy is creditor protection. If only one spouse owes a debt, a creditor generally cannot lien or force a sale of property held this way. Both spouses have to owe the debt for the property to be at risk. Neither spouse can sell or transfer their interest alone either. On divorce, the ownership typically converts to tenancy in common.
Get the Deed Wording Right at Closing
The structure you chose only takes effect if the deed says so. The deed has to specify how title is being taken: “as tenants in common,” “as joint tenants with right of survivorship,” or “as tenants by the entirety.” If it’s silent, most states default to tenancy in common.
This is the step buyers most often miss. Attention goes to price, inspection, and financing, and the title language reads like boilerplate. It isn’t. If the deed says “joint tenants” but you wanted unequal shares as tenants in common, you’re stuck with equal ownership and a survivorship right you didn’t want. Correcting a deed after closing means recording a new document and often getting every party to cooperate, which is much harder once there’s a disagreement.
Changing a deed later, including adding someone to a property you already own, can trigger the due-on-sale clause in your mortgage. Most mortgages give the lender the right to demand full repayment when ownership changes. Transfers between spouses have some exceptions, but adding an unmarried co-owner can cause real trouble if the lender objects. Read the mortgage and talk to the lender before recording anything.
Understand What a Joint Mortgage Binds You To
When co-owners take out a mortgage together, each borrower is jointly and severally liable for the full amount. If your co-owner stops paying their half, the lender can demand the whole payment from you. A missed payment hits every co-borrower’s credit, not only the one who missed it.
Lenders underwrite all co-borrowers together. One person’s weak credit or high debt-to-income ratio can raise the rate or sink the application for everyone. Combined incomes can also help you qualify for a bigger loan than either of you could get alone. The trade is that you’re financially tied together for the life of the loan.
Refinancing brings its own problem. Every co-owner on the current mortgage has to agree to refinance, and everyone has to re-qualify on the new loan. If one co-owner’s finances have deteriorated, refinancing may not be possible without taking them off the loan, which usually means taking them off the title too.
Put a Co-Ownership Agreement in Writing
The deed says who owns what. A co-ownership agreement governs how you actually live with the arrangement. Have a real estate attorney draft it. The cost is small compared to the legal fees of untangling a co-ownership dispute without one.
Financial Obligations
Write down exactly who pays what: down payment split, monthly mortgage share, property taxes, insurance, utilities, HOA fees, maintenance. If shares are unequal, say whether expenses follow ownership percentages or some other formula. Address what happens if someone can’t pay — grace period, interest on late contributions, consequences if it becomes chronic.
Decisions and Property Use
Define which decisions need everyone’s consent (selling, taking out a home equity loan, major renovations) and which any owner can make alone (routine repairs below a set dollar amount). For a vacation or investment property, include a scheduling system for use time.
Exit Provisions
This is where most agreements either prove their worth or fall apart. Include a right of first refusal so the remaining owners can buy a departing owner’s share before it goes to an outsider. Spell out how the buyout price gets set, usually through an independent appraisal by an appraiser everyone agrees on. Address what happens if a co-owner dies, becomes disabled, divorces, or files for bankruptcy. Over the life of the arrangement, at least one of those is likely.
Dispute Resolution
Require mediation before anyone can sue. Mediation costs a fraction of litigation and resolves most disputes faster. Some agreements add binding arbitration as a backstop. A good dispute clause is the main defense against a partition action forcing a sale no one wanted.
Know the Tax Rules Before You Sign
Mortgage Interest and Property Tax Deductions
Each co-owner can deduct only the portion of mortgage interest and property tax they were legally obligated to pay and actually paid during the year.3Internal Revenue Service. Other Deduction Questions If you each paid half, you each deduct half. Keep records of who paid what; the IRS won’t reconstruct it for you.
Capital Gains Exclusion When You Sell
On the sale of a primary residence, you can exclude up to $250,000 of capital gain if you owned and lived in the home for at least two of the five years before the sale. Married couples filing jointly can exclude up to $500,000.4Internal Revenue Service. Topic No. 701, Sale of Your Home The statute applies the exclusion per taxpayer — the $250,000 limit applies to “any sale or exchange” by “the taxpayer.”5Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence Each unmarried co-owner who independently meets the ownership and use tests should qualify for a $250,000 exclusion on their share of the gain. Two unmarried co-owners can reach $500,000 in combined excluded gain, the same total as a married couple.
Gift Tax on Unequal Contributions
If you put someone on the title who contributed less than their share of the price, the IRS may treat the difference as a gift. Pay the full $400,000 for a house titled 50/50 as joint tenants, and you’ve effectively given your co-owner $200,000 of property. In 2026, the annual gift tax exclusion is $19,000 per recipient.6Internal Revenue Service. Frequently Asked Questions on Gift Taxes Anything above that requires a gift tax return, though you likely won’t owe tax unless you’ve used up the lifetime exemption. This doesn’t apply between spouses, who have unlimited marital gift transfers.
Your Co-Owner’s Creditors Can Reach the House
How much protection you have depends on the ownership form.
With tenancy in common, a creditor who wins a judgment against your co-owner can lien that co-owner’s share. The lien attaches to their interest and survives a transfer or bequest. In serious cases, the creditor can force a sale of the debtor’s interest or petition for a partition sale of the whole property.
Joint tenancy has a wrinkle: if the debtor co-owner dies first, the lien is extinguished because that interest ceases to exist under the survivorship right. While the debtor is alive, though, the creditor can force a sale of their interest, which severs the joint tenancy and wipes out survivorship for everyone else.
Tenancy by the entirety is the strongest shield. A creditor of only one spouse generally cannot enforce a judgment against the property at all. Both spouses have to owe the debt. That protection is one of the main reasons married couples pick this form where it’s available.
The Forced-Sale Risk if You Can’t Agree
If co-owners hit an impasse and someone wants out, any co-owner can file a partition action asking a court to divide or sell the property. The right to partition is treated as absolute in most states. Unless you’ve explicitly waived it in a binding agreement, a court will grant it.
- Partition in kind splits the property into separate parcels. It works for large land tracts and almost never for a house.
- Partition by sale orders the property sold and the proceeds split by ownership share. This is the usual outcome for a residence, because a house can’t be cut in half.
Partition sales rarely go well for anyone. The property can sell below market, legal fees eat into the proceeds, and the process runs for months. That’s the practical reason a co-ownership agreement with buyout and dispute clauses matters — it’s the main way to keep a forced sale off the table.
Tenancy by the entirety is the exception. Neither spouse can partition alone. Both must agree, or the marriage must end first.
Whether an LLC Is Worth It
Some co-owners, usually of investment property, hold title through an LLC. The company owns the house, and each co-owner holds a membership interest.
The upside is liability protection: if someone is injured on the property and sues, only the LLC’s assets are exposed, not the members’ personal assets. The operating agreement also gives you a ready-made framework for contributions, decisions, distributions, and exits.
The downsides are real. Forming and maintaining an LLC costs money in filing fees, annual reports, and possibly a separate tax return. Getting a mortgage on LLC-held property is harder, and lenders often require personal guarantees, which undercuts the liability protection. Moving an existing property into an LLC can trip the due-on-sale clause. And the Section 121 primary-residence exclusion doesn’t apply to a house owned by an LLC, because the LLC owns the home, not you.
For a primary residence you plan to live in, an LLC is usually the wrong tool. For an investment property with multiple co-owners, talk it through with an attorney and an accountant.
Plan for the Exits
When One Owner Wants to Sell
If your agreement has a right of first refusal, the departing owner has to offer the share to the remaining co-owners first. The agreement should say how the price is set, usually by independent appraisal, and how long the others have to accept or decline. If they decline, the departing owner can sell to a third party, usually at no less than the price offered to the co-owners.
Without those provisions, a tenant in common can sell their share to anyone without the other owners’ consent. The buyer becomes your new co-owner. A joint tenant who sells severs the joint tenancy, converting the ownership to tenancy in common and ending the survivorship right.
When a Co-Owner Dies
The ownership form controls the outcome. Under joint tenancy or tenancy by the entirety, the deceased owner’s share transfers automatically to the surviving co-owner. Probate isn’t required — the survivor records a death certificate and an affidavit of survivorship to update the title.
Under tenancy in common, the deceased owner’s share passes by will or state intestacy law. The heir inherits the interest and becomes a co-owner, which may require a title transfer through probate.1Legal Information Institute. Tenancy in Common If you hold as tenants in common, make sure your co-ownership agreement addresses this, including whether the remaining owners have the right to buy the inherited share before the heir can sell it to someone else.