When two or more people own the same property together, each holds an undivided interest — a fractional share of the whole parcel, not a fenced-off piece of it. A 50% co-owner does not own "the back half"; both owners have the legal right to possess and use the entire property, subject to the equal rights of the other. That single idea drives almost every co-ownership question in Missouri: who may use the land, who pays the taxes, who can sell, and what happens when the owners no longer agree.
This guide explains the three main forms of Missouri co-ownership, the rights and duties each co-owner carries, and the legal tool — a partition action under RSMo Chapter 528 — that lets any co-owner who wants out force a division or sale of the property when the others will not cooperate.
What does owning an "undivided interest" mean?
An undivided interest is a share of ownership in the entire property rather than ownership of a specific physical portion. Each co-tenant has the right to possess and use the whole, and no co-owner can lawfully exclude another or claim an exclusive corner of the land. The size of the fractional interests (one-half, one-third, 60/40, and so on) affects how money is divided, but not the right to occupy.
The form of co-ownership written on the deed determines critical things — especially what happens when one owner dies and whether one owner's creditors can reach the property. Missouri recognizes three principal forms.
Tenancy in common
Tenancy in common is the default form for unrelated co-owners and anytime the deed does not clearly specify otherwise. Key features:
- Shares can be unequal (one owner 70%, another 30%).
- Each owner may sell, gift, mortgage, or will away their own share independently.
- There is no right of survivorship — when a tenant in common dies, that share passes through the deceased owner's estate (by will or intestacy), not automatically to the co-owners.
Joint tenancy with right of survivorship
A joint tenancy with right of survivorship means that when one owner dies, that interest passes automatically to the surviving joint tenants, outside probate. Missouri requires clear survivorship language in the deed; the law does not presume it. Traditionally a joint tenancy depends on the four unities — time, title, interest, and possession — meaning the owners took equal interests, by the same deed, at the same time, with equal rights to possess. If one joint tenant sells their share, the joint tenancy is generally severed as to that share, which then becomes a tenancy in common.
Tenancy by the entirety
Tenancy by the entirety is available only to married spouses. The couple is treated as a single legal unit owning the whole, with an automatic right of survivorship. Its signature feature is creditor protection: a debt owed by only one spouse generally cannot be used to force a sale of entireties property. A tenancy by the entirety typically ends only by the death of a spouse, divorce, or the couple's joint agreement.
What rights and duties does each co-owner have?
Co-ownership comes bundled with rights and responsibilities that exist among the owners themselves:
- Right to possess the whole. Every co-owner may use and occupy all of the property. One owner using it more than another is not, by itself, wrongful.
- Share of rents and profits. If the property earns income — rent, crop proceeds, timber — a co-owner who collects it generally must account to the others for their proportionate shares.
- Responsibility for taxes and upkeep. A co-owner who pays property taxes, insurance, mortgage interest, or necessary repairs is usually entitled to contribution from the others for their shares.
- Right to deal with your own share only. A co-owner may sell, mortgage, or otherwise encumber their own undivided interest without the others' consent — but cannot sell or mortgage the entire property alone. A buyer of one share simply steps into that owner's shoes as a new co-tenant.
A recurring flashpoint is ouster — when one co-owner physically excludes another or denies their right to enter. Because each owner is entitled to possess the whole, the excluded owner may be entitled to the reasonable rental value of their share for the period of exclusion. Routine "I live here and you don't" arrangements are not automatically ouster; the line turns on whether the occupying owner actually denied the other's right of access.
How does a partition action work in Missouri?
When co-owners cannot agree on selling, refinancing, or buying each other out, any co-owner can ask a court to end the co-ownership through a partition action. Partition is governed by RSMo Chapter 528, and the right is broad: any co-tenant — whether a tenant in common or a joint tenant — generally has the right to seek partition. It is not a remedy you have to "deserve"; a co-owner usually cannot force you to stay in a co-ownership you no longer want. (Tenancy by the entirety is different — spouses generally cannot partition entireties property while married; that division happens in a divorce instead.)
There are two ways a court can divide the property.
Partition in kind (physical division)
Partition in kind physically splits the property among the owners according to their shares — for example, dividing a large farm into separate parcels. Missouri courts prefer partition in kind where it is practical, because it lets owners keep a piece of the actual land. The court may use commissioners (appointed, often disinterested, persons) to survey and recommend a fair division, and may order an owelty payment — cash from one owner to another to equalize shares when a clean equal split is not possible.
Partition by sale
When dividing the land in kind would materially prejudice the owners — for example a single house, a small city lot, or land whose value would be destroyed by carving it up — the court orders a partition by sale instead. The property is sold (often at a court-supervised or sheriff's sale), and the net proceeds are divided among the owners. The party requesting a sale generally must show that physical division is impractical or would reduce the property's value.
The partition process and how proceeds are divided
A partition case follows a recognizable arc:
- Petition. A co-owner files a petition describing the property, naming all owners and lienholders, and stating each party's interest.
- Determination of interests. The court confirms who owns what share and whether any liens or claims attach.
- In kind or by sale. The court decides whether the property can be fairly divided in kind or must be sold, often after a commissioners' report.
- Sale and confirmation (if ordered). The property is sold and the court confirms the sale.
- Accounting and distribution. The court adjusts the shares for credits and debits, then distributes the proceeds.
Accounting and credits among co-owners
Before splitting the money, courts commonly run an accounting so the division is equitable rather than strictly by percentage. A co-owner may receive credits for amounts they paid beyond their share, such as:
- Property taxes and insurance.
- Mortgage payments , at least the interest and principal protecting the common title.
- Necessary repairs and sometimes improvements that added value (often limited to the value added, not the cost spent).
Offsetting these, an owner who had exclusive use of the property may be charged for the reasonable rental value, and an owner who collected rents must credit the others. The net result is that a 50/50 owner who paid every tax bill and the whole mortgage will usually walk away with more than half the proceeds once the accounting is settled. Court costs and reasonable expenses of the partition, including fees the court allows, typically come off the top before distribution.
Frequently Asked Questions
Can one co-owner force the sale of jointly owned property in Missouri?
Generally yes. Any tenant in common or joint tenant can bring a partition action under RSMo Chapter 528, and a court will divide the property in kind or, more commonly for a single home or small lot, order it sold and split the proceeds. The main exception is property held by spouses as tenants by the entirety, which usually cannot be partitioned while the marriage continues.
What is the difference between partition in kind and partition by sale?
Partition in kind physically divides the land among the owners and is the court's preferred outcome when practical. Partition by sale sells the property and divides the money, and a court orders it when dividing the land in kind would materially prejudice the owners — for instance, a single house or a small parcel that cannot be split without destroying its value.
Can I sell my share without the other owners' permission?
If you are a tenant in common or joint tenant, you can generally sell, gift, or mortgage your own undivided interest without the others' consent. You cannot sell the entire property by yourself. A buyer of your share simply becomes a new co-owner alongside the others. Selling a joint-tenancy share typically severs the survivorship feature for that share.
How are sale proceeds divided among co-owners?
Proceeds start from each owner's fractional share but are adjusted through an accounting. Owners get credits for taxes, insurance, mortgage payments, and necessary repairs they paid beyond their share, and may be charged for exclusive use or rents they collected. Court costs and allowed expenses come off the top, so the final split often differs from the raw ownership percentages.
What happens to a co-owner's share when they die?
It depends on the form of ownership. A tenant in common's share passes through their estate by will or intestacy. In a joint tenancy with right of survivorship or a tenancy by the entirety, the deceased owner's interest passes automatically to the surviving co-owner(s) outside probate, which is why the deed's exact wording matters so much.
What if one co-owner has been paying all the taxes and upkeep?
That owner usually has a right to contribution and will receive credits in a partition accounting for taxes, insurance, mortgage payments, and necessary repairs paid beyond their share. Keeping receipts and records is important, because the court adjusts the proceeds based on what each owner can prove they paid to protect or maintain the common property.
Legal Disclaimer
This guide provides general legal information about Missouri law and is not legal advice. It does not create an attorney-client relationship. Co-ownership and partition outcomes depend on your deed, your specific facts, and how interests and credits are proven; consult a qualified Missouri attorney before acting.