I think
@Nords was a serial refinancer whose approach is more similar to the idea in this thread. It has probably worked out well for him. There might be others who have done likewise.
Why yes, yes we are doing that. The spreadsheet has just reached its 20th anniversary.
For those who've joined here after 2014 (or for those
older longer-term members who'd enjoy a stroll down memory lane), here's the original 2004 thread:
Let's put some numbers to the eternal reciprocated diatribes on rent vs own & mortgage vs debt free. I'm not claiming that ownership is always better than renting, or that mortgages are always better than debt-free. Those are personal choices and they probably should have a bigger emotional...
www.early-retirement.org
Instead of a margin loan on a brokerage account, we're essentially borrowing against my future (inflation-adjusted) military pension deposits (using our home as the collateral) and investing the mortgage money.
The tactic works best when the vast majority of your asset allocation is earning more (after taxes) than the interest rate of your mortgage. It doesn't make much sense to borrow at a mortgage rate that's higher than the yields of bonds or even cash. In our case (again, because of my military pension) we've invested in >90% equities for over two decades.
As "serial refinancers" we refi'd the mortgage six times between 2004-2017 for 30-year fixed interest rates from 5.50% to 3.50%. Each refi restarted the 30-year clock and paid for itself in a year or two.
Back when we started this tactic (October 2004) we compared our mortgage interest rate to a small-cap value index ETF (IJS), reinvesting the small dividends (after paying taxes). It was very volatile, and the long-term compounded annual growth rate actually dipped negative for a few months in 2008-09. Even then, though, we were making fixed principal & interest payments on a loan while my military pension rose at the same cost-of-living adjustment as Social Security.
The CAGR during 2004-2017 was 9.04%. That's a sequence of returns risk, but since it included the Great Recession I think it's a reasonable demonstration of both long-term returns and volatility.
In 2017 we cut our investment expense ratios even further by moving out of IJS (in a tax-efficient manner) to the Vanguard total stock market index ETF (VTI).
The CAGR (as of October 2024) has been 13.28%. Of course this is unsustainable, but as it slowly reverts to the mean of the long-term return of the U.S. total stock market it'll still be a lot higher than 3.50%.
We'll pay off this mortgage in September 2047, just before we celebrate my 87th birthday.
Jim Dahle, the White Coat Investor, has written a blog post suggesting that this leverage is only worth doing if it's roughly 15%-35% of your net worth. Any higher, and the risk might wipe you out to the point of returning to the workforce. Any lower, and it's tinkering at the margins of your wealth.