The creation of express trusts in English law must involve four elements for the trust to be valid: capacity, certainty, constitution and formality. Capacity refers to the settlor's ability to create a trust in the first place; generally speaking, anyone capable of holding property can create a trust. There are exceptions for statutory bodies and corporations, and minors who usually cannot hold property can, in some circumstances, create trusts. Certainty refers to the three certainties required for a trust to be valid. The trust instrument must show certainty of intention to create a trust, certainty of what the subject matter of the trust is, and certainty of who the beneficiaries (or objects) are. Where there is uncertainty for whatever reason, the trust will fail, although the courts have developed ways around this. Constitution means that for the trust to be valid, the property must have been transferred from the settlor to the trustees.
If property has not been transferred, the potential trustees and beneficiaries are volunteers, and an equitable maxim is that "equity will not assist a volunteer"; the courts will not look at the case. To get around this, the courts have developed exceptions to this rule for situations when the settlor has done "all that he could do", the trustees or beneficiaries have acquired the property in a different way, or where the gift was made donatio mortis causa. Formality refers to the specific language or forms used when transferring property. For chattels, no formal language or documentation is needed, unless it is made as a will. For land, the transfer must be drafted in line with the Law of Property Act 1925 and the Law of Property (Miscellaneous Provisions) Act 1989. When disposing of an equitable interest, the Law of Property Act 1925 must also be followed; much of the case law in this area has centred on the meaning of "dispose", with many cases involving people attempting to avoid tax.