pb4uski
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
.... Since mortgage is a fixed legal obligation, wouldn't a better benchmark be Bond or CD returns?
IMO, it all depends on where the money to pay off the mortgage comes from and whether or not you adjust your AA... the relevant rate for the mortgage payoff decision is the rate that the money used to pay off the mortgage was earning.
So if you keep the same AA then the relevant rate is the expected rate of return for the portfolio. OTOH, if you change your AA then the relevant rate is the rate on the component that you reduced.
For example, prior to December 2019 my AA was 60/35/5. The 5% cash was established shortly after I retired and was a security blanket thing and I had regularly rebalanced to 60/35/5. The cash was in an online savings account the earned an attrative rate but had gradually declined to 1.7% in Dec 2019 (and is now only 0.6%).
I decided that I no longer needed the security blanket of having 5% in cash and to use that 5% to pay off our 3.375% mortgage. Since the 5% cash was no longer there my revised equity allocation would be 60/(60+35) = 63.2%, which I rounded to 65%, making my new AA 65/35/0. So in that situation, since i changed my AA, I traded not earning I 1.7% for not paying 3.375%.
If I had paid off the mortgage, kept the same AA and rebalanced to 60/35/5 and we assume that in the long run that a 65/35/5 portfolio earns 7% then the relevant rate for the mortgage payoff decision would be 7% compared to 3.375%.
It all comes down to the old economic principle of comparing marginal revenue to marginal cost. The marginal revenue is avoiding the 3.375% on the mortgage, the marginal cost is the 1.7% or 7% given up depending on whether I changed my AA or not.
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