A breach of contract rarely announces itself with a single dramatic event. More often it builds slowly, through missed deadlines, partial deliveries, or vague excuses, until a business relationship that once worked no longer does.

Disputes over the breach of a business contract in Ontario are rarely straightforward. Agreements such as share purchase or asset purchase contracts often involve complex terms, and when one side fails to live up to them, proving the case in court can be difficult. Beyond showing that a breach occurred, the bigger challenge is usually proving the damage. Courts often require detailed evidence and sometimes expert reports to figure out what, if anything, the plaintiff actually lost.