One of the most difficult decisions you can make as you struggle toward financial independence is deciding between paying off the mortgage quickly or investing the excess funds instead. The water is more muddy when we see a roaring stock market for as far back as the eye can see coupled with low interest rates. The answer seems simple and obvious: pay off the mortgage as slowly as possible and invest the difference in broad market-based index funds.
You might also think people well past the mile-marker of financial independence would have an even easier choice. Once the risk of a market decline passes due to your excessive net worth, it is tempting to automatically choose the course with the greatest opportunity for maximum gain.
Your favorite accountant has struggles with the same decision: pay it off or invest. It all came to a head recently when the topic came up on Facebook. I gave my opinion and the fur flew. Before long my inbox was stuffed with requests for a fully fleshed out explanation of my position.