An irrevocable trust that becomes a revocable trust after a certain number of years. An irrevocable trust is one where the grantor forfeits his/her ability to dissolve the trust and to reclaim the assets placed in it, while a revocable trust is one where the grantor retains these rights. If the grantor dies while the trust is irrevocable, the trust is not considered part of his/her estate for estate tax and inheritance tax purposes. On the other hand, if the grantor is still living when the trust become revocable, the assets can be considered part of the estate, but at the same time the grantor may revoke the trust and use the assets if he/she runs into financial difficulty or for any other reason.
A trust that is irrevocable for a predetermined period (at least ten years or until the death of the beneficiary), after which it becomes revocable. During the time the trust is irrevocable it will not be included as part of the donor's estate for tax purposes.