Also known as:capaces negotii · legal capacity · capacity to contract
Written by attorneys · grounded in primary & secondary sources — see below
The legal ability of a natural person to incur at least voidable contractual duties or to enter into other legal relationships such as landlord-tenant arrangements. Capacity may be partial and can depend on the nature of the transaction or surrounding circumstances including guardianship, minority, mental condition, or intoxication.
Sources & Authorities
How it applies
Common Examples
6
Conservatorship Bars Margin Agreement
Charlotte, recently placed under a limited financial conservatorship, attended a reception and signed a margin trading agreement with View Finance after several cocktails. Her conservator April later sought to avoid the agreement. Because Charlotte lacked capacity to incur even voidable duties in financial transactions, the agreement is unenforceable against her.
Incapacity Prevents Lease Formation
Cade Carpenter attempted to lease warehouse space from Canyon Construction while under guardianship for mental illness. The proposed landlord refused to proceed once the guardianship came to light. No landlord-tenant relationship could arise because both parties must possess legal capacity to create that relationship.
Select any source to read its text and confirm it supports the definition.
Uniform Acts
Common Law
Restatements
Dictionaries
Death Terminates Acceptance Power
Christopher Collins mailed an offer to sell equipment to Colin Chambers. Before Chambers could accept, Collins suffered a stroke that deprived him of legal capacity. The offeree's power of acceptance ended upon the offeror's loss of capacity, so no contract formed.
Minority Voids Equipment Sale
Caleb Chang, a seventeen-year-old, signed a contract to purchase industrial tools from Cascade Manufacturing. After the seller delivered the equipment, Chang sought to disaffirm. Because he was an infant at the time of assent, he lacked full legal capacity to incur contractual duties.
Partial Capacity Limits Stock Purchase
Chloe Chen, under a limited conservatorship that restricted only high-risk investments, agreed to buy volatile shares from Cypress Technologies. The conservator later challenged the purchase. Capacity to contract can be partial, so the transaction fell outside the authority granted by the court order.
School Admission Contract Enforced
Parents of Black children sought to enroll their children in a private school that refused admission on racial grounds. The school claimed the parents lacked capacity to form enrollment contracts. The children possessed full legal capacity to enter the proposed educational contracts, so the refusal violated federal law.
Runyon v. McCrary427 U.S. 160 (1976)
Common questions
Frequently Asked
4
When does a conservatorship render a contract voidable?+
A court-ordered conservatorship limits the protected person's authority to incur contractual duties within its scope. The limitation prevents formation of even voidable obligations in the restricted area. The other party cannot enforce the agreement once the conservatorship is shown.
Supporting sources
Does loss of capacity after an offer is made terminate the offeree's power of acceptance?+
Yes. The power of acceptance ends when either the offeror or offeree loses legal capacity to enter the proposed contract. No contract can form once that capacity disappears.
Supporting sources
Can a landlord-tenant relationship exist if one party lacks contractual capacity?+
No. The relationship requires that both parties possess legal capacity or requisite authority to enter it. Absence of capacity on either side prevents the relationship from arising.
Supporting sources
What mental conditions defeat capacity to contract?+
A natural person lacks capacity if under guardianship, an infant, mentally ill or defective to the point of inability to understand or act reasonably in the transaction, or intoxicated to the same degree. The other party must have reason to know of the condition in some cases.
Supporting sources
392 U.S. 409 (1968)Property
…them ineligible to do so elsewhere in the city. Thus, if § 1982 had been thought to do no more than grant Negro citizens the legal capacity to buy and rent property free of prohibitions that wholly disabled them because of their race, judicial enforcement of the restrictive covenants at issue would not have violated § 1982. But…