I spent a few minutes trying to figure out the RoA thing. Say the home is worth x and appreciates at 6%. The more cash I invest in the home, the more of the asset I own, and my RoA is 6% (this equals my investment goal for our theoretical year).
Why should I not gaurantee myself a return on investment of 6%, increase the net yield of my RoA at the same time, and decrease the interest I’m paying out to others?
Let’s say that your house is worth $200k today. Unlike other investments, that value is irrespective of the *equity *that you have in the house. If you own it free and clear, it’s worth the same as if you’re mortgaged to the hilt. As the house appreciates, it does so independently of your equity in the house.
Let’s say you’re a prudent homeowner and bought with 20% down. Your mortgage is $160,000, you have $40,000 in equity, but your house is still worth $200,000…
Now, over the next 5 years, let’s say the value of the house appreciates 50%, to $300,000…that appreciation, and the subsequent value of the house is the same no matter how much additional principal you pay into your mortgage along the way. If you started with $40,000 in equity fr your 20% down payment, after the 5 years, your equity is now $140,000. Now let’s say that instead of just making your monthly mortgage payment, you also pay down an additional $10,000 per year in principal. After 5 years, you’ve paid down and additional $50,000 and your total equity is now $190,000…the difference being exactly equal to the amount of additional principal that you paid down. You’ve earned nothing on that $50,000. The same as if you’d simply put it into a shoe box in your closet. You’d be far better off with a safe investment that offers a minimal return like a cd or money market.
The exception lies in the length of time that you’re going to own the house. If you do expect to be there for the entire length of the 30 year mortgage, then you will save some $'s on your interest by paying down the principal. Even then though, you’ll need to take a careful look at the time value of the money that you’re paying into additional principal along the way to ensure that it still doesn’t exceed the interest savings. For most of us who aren’t going to be in a house for 30 years, it’s not even close.
Does that help?