A will is the key document in estate planning, but an inter vivos trust can also be useful. Inter vivos trusts can be confidential, flexible, and ensure that trust property falls outside of an estate. Generally, property that falls outside of an estate is exempt from probate fees and cannot be claimed by anyone who is not the intended beneficiary. In this way, an inter vivos trust can be used to protect property that one person intends to give to someone else.