For all you folks in the "pay off the mortgage camp", more power to you, but without doing the detailed math, I think I could safely say my net worth would be half or less of what it is had I followed that path.
I've said this in another thread, so if this seems like a repeat: it is.
The math surely works for loans at the current less-than-market rate. I shall not argue that.
But there are other reasons to be mortgage free:
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ability to build at your own pace - You don't find this out until you try to do it, but: If you want to build your dream house, you have to build it to 100% and you have to do it at a reasonable pace. The builder is most likely taking out a higher interest builder loan and he wants to turn this around fast. The bank won't let you finish half of it. That's too risky for them (and you won't get a certificate of occupancy, even though it's fully functional and fully built to code.). If you build it for cash, you can do it piecemeal. You can take your plan and divide it into reasonable chunks, building some of it part way and some of it fully finished.
In my case, I did all the paint, all the finish carpentry, all the tile, restored/installed some appliances and totally left the upstairs undone. A bank wouldn't do this (or minimally wouldn't do this at the bargain basement interest rates.) I am slow. A normal builder wouldn't wait on me while his line of credit sits there asking for payments. When I took the bank loan off the builder, he was more than willing to go away for a month while I did a job.
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more likely to build smaller - When you're sitting down bidding the plan out, it is so easy to get caught in that "but it's only $20 a month more" trap. And those $20 a month add up. It's not just the 3 car garage, it's the way you finish the kitchen, the floors, etc. There is a snowball to this stuff. And it is so easy to understand it's only a few hundred dollars a month more. And that few hundred often comes with more property taxes, more maintenance, more to heat/cool, more, more, more. Does this end up being more than you'll make if you invest? I haven't put the math to it and it really depends on the person. You may be able to resist the $100 a month more and I may not.
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psychological reasons - I think everyone understands these. It feels like mine. Corollary: after retirement, my monthly costs are lower. There is always the ability to pull the equity out via HELOC/reverse mortgage/etc.
* I am sure there are more good reasons. That doesn't mean that a mortgage isn't right for some people. It wasn't right for me.