What a testamentary trust will actually does
An ordinary will leaves assets to your beneficiaries outright, in their own names. A testamentary trust will instead directs each inheritance into a trust created by the will. Your beneficiary usually controls their trust and can use and invest the money freely. Because they do not own it outright, it is held at one remove from their personal risks. The structure only comes into existence on your death, so nothing changes for you during your lifetime.