Anybody have experience using BMO mortgage cash account? This is where you can pre-pay down the principle and then supposedly withdraw those funds when needed. I’ve been frustrated by the terms and conditions on my daily HISA so thinking this could be a way to get the equivalent of 5.15% (my current mortgage rate) for money that I don’t need to touch frequently. Seems like I can’t do better than this even in a HISA ETF.

My concerns are: am I thinking about this the right way? (Paying down principle on mortgage is equivalent to earning that percentage in a regular bank account?). Does this BMO mortgage feature really work like this? It wasn’t advertised to me, I had to dig into it.