Creation, validity, and funding are related, but they are not the same thing.
People often treat trust setup as one event: “the trust was signed.” That is too simple.
In practice, there are at least three separate questions. Was the trust created in a legally recognized way? Does it satisfy the legal requirements for validity? And were assets actually moved into the structure so the trustee has something to control, protect, and record?
In plain English, a trust can be drafted without being usable, valid without being well funded, or funded badly enough to cause future administrative trouble.

