A declaration of trust can be self-assessed if it declares the same trust details as those listed on the contract for sale/offer and acceptance.
Example
Simone enters into a contract for sale to purchase a home as trustee for the Black Family Trust. She executes a declaration of trust the same day declaring the same property is held as trustee on behalf of the Black Family Trust. This can be self-assessed because the declaration of trust is in confirmity with the contract for sale.