Many Canadian homeowners are surprised to discover that breaking a fixed-rate mortgage with a big bank can lead to dramatically higher penalties compared to monoline lenders. The key difference lies in how penalties are calculated—major banks often use inflated posted rates, resulting in much steeper costs if you need to exit your mortgage early. In contrast, monoline lenders typically base penalties on actual contract or market rates, offering more flexibility and significantly lower fees. Understanding these differences is crucial to making informed mortgage decisions that protect your financial future and provide you with options if your circumstances change.