In a traditional mortgage, a little bit of the loan principal is paid down with every mortgage payment. The Smith Manoeuvre (SM) leverages the fact that interest expense on an investment loan is tax deductible (but interest on a mortgage isn’t) by taking out an investment loan equal to the principal payment portion of every mortgage payment and investing the proceeds in the equity market. In theory, equity returns will beat the tax deductible interest payments on the loan and over the long-term you’ll come out ahead with the SM than just paying down the mortgage.

It is hardly surprising that the Smith Manoeuvre is so popular now these days after more than five years of double-digit equity returns. What could be simpler than borrowing at low single digits and investing it in equities for a 20% return? Most investors understand that the Smith Manoeuvre presents an attractive arbitrage opportunity but haven’t forgotten the pain of a brutal bear market. So, financial advisors are now getting clients to implement the Smith Manoeuvre using segregated funds and other hare-brained schemes offering “principal protection”.

The key to succeeding with the SM is lowering your investment costs and hoping that the investing gods will continue to be benevolent. The SM only works when you borrow at say 4% (accounting for the tax deduction) and earn say 5% (after tax) on your investments. If experts are right about low future equity returns in the 7.5% range and your investment costs are 2.5%, your gross returns are going to be about 5%. Your after-tax returns are likely to be in the 3.5% to 4% range, hardly justifying the risks you take in equities. Note that some experts are of the opinion that equities will essentially be flat over the next 12 to 15 years. If that happens, you would wish that you had never heard of this strategy.

I have teamed up with Frugal Trader of Million Dollar Journey to develop a DIY Smith Manoeuvre with rock-bottom investing costs. In tomorrow’s post on his blog, FT will discuss his thoughts on readvanceable mortgages available to Canadians and I will continue the series with investment options and tax considerations. Please be warned that implementing the SM requires you to understand the risks involved in leveraging to invest in the equity markets and to keep up with the tax implications of the strategy.

Warning: The Smith Manoeuvre is a leveraging strategy. Leveraging to invest in the equity markets is risky. You could possibly earn less in the equity markets than your interest charges even over the long term. You should determine the appropriate amount of leverage that you will be comfortable with, so that you won’t panic and sell when markets tumble. Though I believe the information provided in this series of posts is accurate, check with your accountant that everything is kosher and you won’t have trouble with the CRA regarding the tax deductibility of interest. Handle with care, double check everything and please keep in mind that I’m just a guy with a website, not a financial advisor. In the interests of full disclosure, I should mention that I personally don’t, or have any plans to, implement the SM.