Alright - I've done the FireCalc runs and 3X checked them. There is one very unexpected result - at least for me.
Here's the comp I used, with a 30 year $200,000, 5.5% mortgage:
Mr Cash:
$1M portfolio, no mortgage, $35,000 spend, 75% EQ.
Worst Case FireCalc result at 30 years, 75% EQ: $87K balance.
Mr Mortgage:
$1.2M portfolio, $35,000 spend, $13,632 annual mortgage pay, 75% EQ.
Worst Case FireCalc result at 30 years, 75% EQ: $103K balance.
Generally, people would say that the extra $200K in the portfolio should go to fixed income to reduce 'risk'. So that gives a 63% EQ ratio.
With that, Mr Mortgage gets:
Worst Case FireCalc result at 30 years, 63% EQ: $161K balance.
So, if you accept the dip in your Net Worth number as a measure of your real, personal, gut-check risk, it would appear that holding a mortgage decreases risk, right? It adds over two years to your portfolio life (difference /$35K = 2.1 years).
OK, now an interesting observation....
You better plan on holding that mortgage for about 25 years. Because if you cash it in at say, 20 years, your portfolio balance will be lower with the mortgage. At 20 years: $290K for Mr Cash vs $253K for Mr Mortgage. And it gets worse the earlier the cash in date.
So, that sure makes points for the Cash people - few of us can be certain of holding our mortgage that long. So, maybe Cash is King after all?
But, doesn't that also lead to....
If you already have a mortgage, this seems to say that paying it off early is the WORST thing you could do!!?? It looks to me like the 'deal has been done', and once you are in you should stick it out as long as you can.
Hmmmm. Let's say that again. Going w/o a mortgage is probably best since we can't be certain of holding for 25 years, but if you have a mortgage, keep it. Can that be right?
I think the explanation is - the whole thing is based on arbitrage of the mortgage. But, we need to go near full term for that arbitrage to 'work', because a mortgage is front-end loaded with interest, while the fixed-income loans that personal investors make are interest-only loans. Does that explain it? Help, my brain hurts!
So, I welcome anyone else running the numbers and reporting back; maybe I goofed somewhere, maybe my assumptions are out-of-line? And I'd love to see a 15 year loan (Twaddle?) - I tried one and it didn't look pretty, but I am not going to 3X check that tonight.
Regards - ERD50