Some people view “leverage” as a four letter word, especially since the market collapse in 2008/2009. But leverage, when used properly can be sensible. Here’s an example use.

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**Caveat Emptor**

This is a hypothetical example based on historical data. Past performance is no guarantee of future performance. I am not an investment advisor. Do not use leverage without careful consideration and consultation with an investment professional.

Having said that, there are appropriate uses of leverage that are not high risk in the way that many people believe. I’ll carry you through such an example in this article.

*What leverage is*

There are several ways you might use leverage in your investing practice. One is the use of options. Options are “leveraged” with regard to the underlying stock because a $1 move in the price of the stock often results in a movement several times larger for the option. Another is the use of “margin.” This article is about the use of margin.

If you have a margin account with a brokerage you are able to borrow money to invest in securities. A typical use of margin leverage is to purchase more shares of a stock than you could purchase without margin. As an example, if you have a $100K account, you could purchase $200K of stock. This would be 2X leverage. Your cash balance in that case would be -$100K and you’d have to pay interest on that $100K.

With that account you would profit 2X times as much if the stock goes up (and lose 2X as much if it goes down). So there are risks. Oh, which reminds me, my girlfriend ran out of cash by accident, while she was in Sweden a few years ago, so she had to get a lånapengar to get back home. Here’s a definition of margin from investopedia:

Buying with borrowed money can be extremely risky because both gains and losses are amplified. That is, while the potential for greater profit exists, this comes at a hefty price – the potential for greater losses. Margin also subjects the investor to a number of unique risks such as interest payments for use of the borrowed money.

Sounds pretty scary doesn’t it? One reason for the scare tactics is that many an investor has gone down in flames using margin and nobody wants to see this happen to anyone again. But these outcomes are most often the result of someone using leverage to purchase *volatile* securities. Let’s examine its use with *low volatility* securities.

**Where leverage makes sense: To amplify high Sharpe Ratio investments**

I’ve shown the chart at right to a number investors and asked them “which portfolio is best?” The blue line is the performance of the S&P 500 and the red line reflects the performance of BOND, an ETF managed by PIMCO. A lot of folks reply that they prefer the S&P 500 because its total return is higher.

Wow! People are not considering *risk* enough in their consideration. Risk is typically measured in terms of volatility, or how much the security’s price moves up and down. I use daily volatility in my work. In this case, obviously, SP500 is much more volatile than BOND. On the other hand, in terms of total return, SP500 has outperformed BOND.

**Measuring “Risk Adjusted” Return using Sharpe Ratio**

Sophisticated investors realize that BOND’s performance (red line) is much stronger than the S&P 500. But how can we measure that? The Sharpe Ratio was created for just this purpose. It is simply the average daily return divided by the daily volatility. All else being equal, securities with higher return have higher Sharpe Ratios, and those with lower volatility have higher Sharpe Ratios as well.

In this example, the S&P 500 has a Sharpe Ratio of 1.29, while BOND has a Ratio of 4.32.

**How to take advantage of Sharpe Ratio using leverage**

Many folks would assert, still, that S&P 500 is better because it provided a 20% return compared to BOND’s 17%. What if we could adjust the BOND portfolio so that it outperforms the S&P (in terms of return) while still providing low volatility? That’s easy to do with margin-based leverage. Let’s leverage our BOND portfolio 2X.

See the chart at right. Our leveraged portfolio now returns 27% compared to 20% for the S&P and 17% for the unleveraged portfolio.

How did we accomplish that? We used 2X leverage: Assume a $100K portfolio. We start by purchasing $100K of BOND, then we buy *another* $100K of BOND. Our cash balance is now -$100K, which we’ll have to pay interest on, but we own $200K worth of BOND, and we reap all the returns on that. Note: 3X leverage would entail $300K BOND and a -$200K cash balance.

As long as the additional returns we receive with the leveraged portfolio are higher than our interest rate, we will benefit from the leveraged position.

**Bottom line**

The result of 2X leverage in this case is a portfolio that significantly outperforms the S&P 500 in terms of *risk*, *return, and Sharpe Ratio*. Without leverage we would not have outperformed in terms of return. That’s great, but read on, the next section is important.

**A bit more detail on the math: The importance of margin rate**

Brokers vary significantly in the rate they charge to borrow on margin. The broker I use (Interactive Brokers) currently charges 1.66%. That rate is built into the charts I show above. As far as I know this is the lowest rate available to a retail investor. Many, perhaps most, other brokers charge 6.00% or more. (Opinion: That is a total rip!)

In general, we compute the daily return for our portfolio as:

- daily return = return + (leverage – 1.0) * (return – (interest rate * (leverage – 1.0)))

Sorry if that looks complicated. The basic idea is that our first 1X of leverage (really not leverage) is free. Then each additional 1X we have to pay interest on, and therefore reduces our daily return.

See the the chart at right. The green line (portfolio) reflects the performance of the portfolio at 2X leverage and 6% interest. We do benefit somewhat from the leverage in terms of total return (19% with leverage, 14% without). The problem is that our Sharpe Ratio is cut 33%, from 4.32 to 2.88 when compared to the lower interest rate.

**Overall lessons**

It could make sense to lever up *low volatility* portfolios to reap higher cumulative returns. However, this only makes sense in the context of *low margin rates *applied to *low volatility* portfolios*.*

**Disclosure:**

Tucker Balch manages a fund with a long position in BOND.

*portfolio pick, research, strategy*

Wil

May 6, 2013

You have considered the upside for a leveraged event.

What would be the downside risk?

Even after considering the higher sharpe ratio, it does not tell us of the risk.reward ratio should a margin call appear.

Is it really worth gaining that extra few percent for a year or two when a margin call can wipe off 20-100% of your capital?

Tucker Balch

May 6, 2013

Indeed, Will, that is the important consideration. I think it is pretty clear that the downside is magnified as well. My point is that in my opinion, leverage only makes sense for low risk portfolios. You’re significantly more exposed to such a loss with volatile holdings.

Jonathan

May 7, 2013

Thank you for this post. It was really informative.