There was a lot of good discussion in my lengthy early mortgage payoff post. Now instead of lengthy details, let me try out a quick rule of thumb about early mortgage payoff. Recall from Wikipedia:
A rule of thumb is a principle with broad application that is not intended to be strictly accurate or reliable for every situation. It is an easily learned and easily applied procedure for approximately calculating or recalling some value, or for making some determination.
So roughly applicable to many – but not all – situations.
Early Mortgage Payoff Rule of Thumb
You should time your mortgage payoff date to coincide with the date of retirement, or semi-retirement. Here, I would define retirement or semi-retirement as a time when you’ll be wholly or partially dependent on non-work income like Social Security, pensions, annuity payments, stock dividends, or other investment income. A downshift into a lower-paying second career would count as a semi-retirement.
In my humble opinion, this quick and dirty rule will help you balance the opportunity to invest in potentially higher-returning investments (stock mutual funds, dividend-paying stocks, real estate, high-yield bonds) with pursuing the benefits of having a fully-owned house (less stress, less leverage, lower required monthly expenses, lower required withdrawals from investments and thus lower marginal tax rates).
Example 1. 20s, 30s, 40s with long future career. You love your job and/or want to be doing it for the next 25+ years. In this case you have lots of human capital and a regular stream of income. You also won’t be needed to cash out your retirement assets for a long-time, making it much more likely that your stocks will achieve their higher average returns. Take on the 4% interest rate fixed for 30 years, and over time your salary will rise with inflation while your payment stays the same.
If anything, you could do a DIY biweekly payment plan and pay off your mortgage in under 24 years with less “pain” due to a behavioral trick (works best for those on a biweekly paycheck schedule).










We finally signed the closing documents on our most recent 
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