In property law, a concurrent estate or co-tenancy is any of various ways in which property is owned by more than one person at a time. If more than one person owns the same property, they are commonly referred to as co-owners. Legal terminology for co-owners of real estate is either co-tenants or joint tenants, with the latter phrase signifying a right of survivorship. Most common law jurisdictions recognize tenancies in common and joint tenancies.

Many jurisdictions also recognize tenancies by the entirety, which is effectively a joint tenancy between married persons. Many jurisdictions refer to a joint tenancy as a joint tenancy with right of survivorship, but they are the same, as every joint tenancy includes a right of survivorship. In contrast, a tenancy in common does not include a right of survivorship.

The type of co-ownership does not affect the right of co-owners to sell their fractional interest in the property to others during their lifetimes, but it does affect their power to will the property upon death to their devisees in the case of joint tenants. However, any joint tenant can change this by severing the joint tenancy. This occurs whenever a joint tenant transfers their fractional interest in the property.

Laws can vary from place to place, and the following general discussion will not be applicable in its entirety to all jurisdictions.

Rights and duties of co-owners (general)

Under the common law, Co-owners share a number of rights by default:

  1. Each owner has an unrestricted right of access to the property. When one co-owner wrongfully excludes another from using the shared property, the excluded co-owner can bring a cause of action for ouster. As a remedy, the court may grant the wronged co-owner the fair rental value of the property for the time that they were ousted.
  2. Each owner has a right to an accounting of profits made from the property. If the property generates any income (e.g. rent, farming, etc.) each owner is entitled to a pro-rata share of that income.
  3. Each owner has a right of contribution for the costs of owning the property. Co-owners can be forced to contribute to the payment of expenses such as property taxes, necessary maintenance and repairs, or mortgages for the entire property.

Contribution and improvements

Co-owners generally do not have any obligation to contribute to any costs of improving the property. If one co-owner adds a feature that enhances the value of the property, that co-owner has no right to demand that any others share the cost of adding that feature even if other co-owners reap greater profits from the property because of it. However, at partition, a co-owner is entitled to recover the value added by their improvements of the property if the "improvements" resulted in an increase in property value. Conversely, if the co-owner's "improvements" decrease the value of the property, the co-owner is responsible for the decrease. In an Australian case, the High Court said that the costs of repairing by one co-owner must be taken into account on the partition or final distribution (i.e. sale) of the property.

Mortgages

Each co-owner can independently encumber the co-owner's own share in the property by taking out a mortgage using fractional financing on that share (although this may effectively convert a joint tenancy to a tenancy in common, as described below); other co-owners have no obligation to help pay a mortgage that only runs to another owner's share of the property, and the mortgagee can only foreclose on that mortgagor's share. Bank loans secured by mortgages on individual shares of co-owned property are one of the most rapidly expanding areas in the mortgage lending industry.

Tenancy in common

Tenancy in common (TIC) is a form of concurrent estate in which each owner, referred to as a tenant in common, is regarded by the law as owning separate and distinct shares of the same property. By default, all co-owners own equal shares, but their interests may differ in size.

TIC owners own percentages in an undivided property rather than particular units or apartments, and their deeds show only their ownership percentages. The right of a particular TIC owner to use a particular dwelling comes from a written contract signed by all co-owners (often called a "Tenancy In Common Agreement"), not from a deed, map or other document recorded in county records. This form of ownership is most common where the co-owners are not married or have contributed different amounts to the purchase of the property. The assets of a joint commercial partnership might be held as a tenancy in common.

Joint tenancy

A joint tenancy or joint tenancy with right of survivorship (JTWROS) is a type of concurrent estate in which co-owners have a right of survivorship, meaning that if one owner dies, that owner's interest in the property will pass to the surviving owner or owners by operation of law, and avoiding probate. The deceased owner's interest in the property simply evaporates and cannot be inherited by their heirs. Under this type of ownership, the last owner living owns all the property, and on their death the property will form part of their estate. Unlike a tenancy in common, where co-owners may have unequal interests in a property, joint co-owners have an equal share in the property.

Creditors' claims against the deceased owner's estate may, under certain circumstances, be satisfied by the portion of ownership previously owned by the deceased, but now owned by the survivor or survivors. In other words, the deceased's liabilities can sometimes remain attached to the property.

This form of ownership is common between spouses, parent and child, and in any other situation where parties want ownership to pass immediately and automatically to the survivor. For bank and brokerage accounts held in this fashion, the acronym JTWROS is commonly appended to the account name as evidence of the owners' intent.

To create a joint tenancy, clear language indicating that intent must be used e.g. "to AB and CD as joint tenants with right of survivorship, and not as tenants in common". This long form of wording may be especially appropriate in those jurisdictions which use the phrase "joint tenancy" as synonymous with a tenancy in common. Shorter forms such as "to AB and CD as joint tenants" or "to AB and CD jointly" can be used in most jurisdictions. Words to that effect may be used by the parties in the deed of conveyance or other instrument of transfer of title, or by a testator in a will, or in an inter vivos trust deed.

If a testator leaves property in a will to several beneficiaries "jointly" and one or more of those named beneficiaries dies before the will takes effect, then the survivors of those named beneficiaries will inherit the whole property on a joint tenancy basis. But if these named beneficiaries had been bequeathed the property on a tenancy in common basis, but died before the will took effect, then those beneficiaries' heirs would in turn inherit their share immediately (the named beneficiary being deceased).

Four unities of a joint tenancy

To create a joint tenancy, the co-owners must share "four unities":

  • Time – the co-owners must acquire the property at the same time. So, for example, if a piece of land was vested to ABCD as co-owners on 1 January 2018 and ‘A’ died before the date leaving ‘K’ to succeed him for, as between K on the one hand and BCD on the other hand, there is no unity of time. K becomes a tenant in common, while BCD are joint tenants.
  • Title – the co-owners must have the same title to the property. It is based on an old English common law view that a married couple is one legal person for the purpose of owning property. (In the State of Hawaii, the option of ownership in an tenancy by the entirety is also available to domestic partners in a registered "Reciprocal Beneficiary Relationship"; Vermont's Civil Union statute qualifies parties to a civil union for tenancy by the entirety.)

Like a Joint Tenancy with Rights of Survivorship, the tenancy by the entirety also encompasses a right of survivorship, so if one spouse dies, the entire interest in the property is said to "ripen" in the survivor so that sole control of the property ripens, or passes in the ordinary sense, to the surviving spouse without going through probate.

In some jurisdictions, to create a tenancy by the entirety the parties must specify in the deed that the property is being conveyed to the couple "as tenants by the entirety," while in others, a conveyance to a married couple is presumed to create a tenancy by the entirety unless the deed specifies otherwise. (see also Sociedad de gananciales.) Also, besides sharing the four unities necessary to create a joint tenancy with right of survivorship time, title, interest, and possession there must also be the fifth unity of marriage. However, unlike a JTWROS, neither party in a tenancy by the entirety has a unilateral right to sever the tenancy. The termination of the tenancy or any dealing with any part of the property requires the consent of both spouses.

A divorce of the parties to the marriage who own a property in a tenancy by the entirety automatically breaks the unity of marriage, leaving the default tenancy. In death or divorce, there is a right of survivorship in the remaining spouse.

Some US jurisdictions no longer recognize tenancies by the entirety.. Where it is recognized, benefits can include the ability to shield the property from creditors of only one spouse, as well as the ability to partially shield the property where only one spouse is filing a petition for bankruptcy relief.