A trust is an arrangement that separates out ownership of an asset. Under a standard trust a person gives up an asset for the beneﬁt of someone else (the beneﬁciary) under a set of rules (the trust deed.) These rules are enforced by a third person, the trustee. Trusts are used extensively in tax havens, whose laws provide secrecy which allows the original owner to pretend to have given away the asset while in reality still controlling it. This allows them to potentially escape the tax bill on its income, or hide links to money laundering or other criminal activity.