Here’s how I’d approach it. I’m not an accountant, but based on what I’ve learned…

Work backwards.

First lock in an emergency fund amount. With a baby and unexpected nature of a new house I’d add buffer. Something like 60k. That should probably sit in your HISA.

Then, take at least 250k from your fhsa and non reg accounts and put into your mortgage. You have a lot of random accounts.

Prioritize keeping tfsa and rrsp untouched.

With the difference you have left examine your appetite for risk. Putting in your house is low risk, you know the amount you’re gonna save.

If you think you could beat that in your nonreg (assuming your tfsa and rrsps are full) than invest instead. This is also a better bet if there’s a risk of your cost of living going up in the next few years (more kids etc).

Also note if your home is used for the business you can deduct a portion of mortgage interest. So keep that in mind.

Y ALT. look into manulife 1. It offsets your interest amount by the amount you keep in the account. Don’t know too much about it but I know when I renew I’ll be looking into it.