Unilateral gratuitous obligations

Unilateral gratuitous obligations are undertaken voluntarily and are also known as unilateral voluntary obligations or gratuitous promises. If one person promises in definite terms to do something to benefit or favour another, he may be under a legal obligation to keep his promise.

Example: promise to donate a sum of money to a charity.

This is unilateral. It imposes a legal obligation on only one person (the donor) and is gratuitous because the other party (the charity) does not do anything in order to be entitled to the money.

Not a major feature of commercial dealings, but they do sometimes arise in a business context. Examples:

Promise to keep an offer open for a certain period of time
Promise to renegotiate the terms of a contract

In England, gratuitous obligations are not generally regarded as being enforceable if verbal or executed under hand. This is because, in English law, there is a doctrine of consideration which requires that both parties must be under an obligation to give something of value, before either will be legally bound to an obligation. Gratuitous obligations will only be enforced by the courts if they are constituted by deed.

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