“As we explain below, we believe that a fairly negotiated agreement that represents the intentions and expectations of the parties and that complies substantially with the objectives of the Divorce Act as a whole should receive considerable weight. In an originating application for spousal support, where the parties have executed a pre-existing agreement, the court should look first to the circumstances of negotiation and execution to determine whether the applicant has established a reason to discount the agreement. The court would inquire whether one party was vulnerable and the other party took advantage of that vulnerability. The court also examines whether the substance of the agreement, at formation, complied substantially with the general objectives of the Act. As we elaborate later, these general objectives include not only an equitable sharing of the consequences of the marriage breakdown under s. 15.2, but also certainty, finality and autonomy. Second, the court would ask whether, viewed from the time the application is made, the applicant has established that the agreement no longer reflects the original intention of the parties and whether the agreement is still in substantial compliance with the objectives of the Act.”
Miglin v. Miglin, [2003] 1 SCR 303, 2003 SCC 24 (CanLII) at 4