When to prioritize mortgage prepayment over taxable investing: a math-first guide
I remember the first time I ran the numbers for a friend deciding whether to throw extra cash at their mortgage or invest in a taxable brokerage account. The instinctive reactions — "pay off the mortgage, you're getting a guaranteed return" vs "the market returns 7–10% long term, so invest" — felt unhelpful without math. So I built a simple framework that strips emotion and politics out of the decision and focuses on after-tax,...