In American estate planning parlance, an incentive trust is a trust designed to encourage or discourage certain behaviors by using distributions of trust income or principal as an incentive. A typical incentive trust might encourage a beneficiary to complete a degree, enter a profession, or abstain from harmful conduct such as substance abuse. The beneficiary might be paid a certain amount of money from the trust upon graduating from college, or the trust might pay a dollar of income from the trust for every dollar the beneficiary earns.

he Protective Trust is a form of settlement found in England and Wales and several Commonwealth countries. It has marked similarities to asset-protection trusts found in several offshore jurisdictions and US Spendthrift trusts.

In such a trust, assets are ordinarily held to pay an income to the beneficiary. The beneficiary may also have access to capital of the trust with the trustee's permission. The right to receive income from a trust would ordinarily be an asset in the hands of the beneficiary and could be sold, thwarting the intention of the donor to spread the gift over the recipient's lifetime. Additionally, on a bankruptcy the right to the income would be sold by the beneficiary's trustee in bankruptcy.

A purpose trust is a type of trust which has no beneficiaries, but instead exists for advancing some non-charitable purpose of some kind. In most jurisdictions, such trusts are not enforceable outside of certain limited and anomalous exceptions, but some countries have enacted legislation specifically to promote the use of non-charitable purpose trusts. Trusts for charitable purposes are also technically purpose trusts, but they are usually referred to simply as charitable trusts. People referring to purpose trusts are usually taken to be referring to non-charitable purpose trusts.

Trusts which fail the test of charitable status usually fail as non-charitable purpose trusts, although there are certain historical exceptions to this, and some countries have modified the law in this regard by statute. The court will not usually validate non-charitable purpose trusts which fail by treating them as a power. In IRC v Broadway Cottages Trust  Ch 20 the English Court of Appeal held: "I am not at liberty to validate this trust by treating it as a power. A valid power is not to be spelled out of an invalid trust."