The Simple Magic of Investing in a Three-Fund Portfolio

Occam’s razor is the idea that the simpler solution is more likely to be correct than complex solutions.

In investing, Occam’s razor is right. Simple is better.

And in this case, simple means a handful of passively managed index funds.

Over the long run, index investing has beaten actively managed funds as well as hedge funds. Most famously, there was the $1 million bet between a co-manager at Protégé Partners (a hedge fund) and Warren Buffett.

The bet was that a fund of five hedge funds could beat the S&P 500 over 10 years… SPOILER ALERT! It did not.

(and it lost by a very wide margin)

There are a lot of reasons why passively managed index funds beat actively managed funds.

But there are also quite a lot of them. If you look at some of the most popular Vanguard funds, you’ll see both Total Stock Market and S&P 500. What’s the difference? Do you need them both? What’s the mix?

Fortunately, it’s even simpler than that.

You can build a great diversified portfolio with just three funds.

Table of Contents
  1. What is the Three Fund Portfolio?
  2. How do I set my allocation?
  3. Other “Lazy” Porfolios
  4. Is It Really That Simple?

What is the Three Fund Portfolio?

Unless you’re a big fan of Vanguard, Jack Bogle (founder of Vanguard), or are a Boglehead (huge fans of Vanguard), you probably don’t know who Taylor Larimore is.

Taylor Larimore is considered the dean of the Bogleheads and author of several books, one of which is titled The Bogleheads’ Guide to the Three-Fund Portfolio.

I think it’s safe to say that he’s the originator of the idea of a three-fund portfolio, most recently captured in this post on the Boglehead forums in 2012. The three-fund portfolio is one of the most popular portfolio setups among Bogleheads for its diversification and its simplicity.

A three-fund portfolio consists of:

  • Domestic stock “total market” index fund
  • International stock “total market” index fund
  • Bond “total market” index fund

You can get these funds from anywhere but the three Vanguard funds that fit this approach are:

  • Vanguard Total Stock Market Index Fund (VTSAX)
  • Vanguard Total International Stock Index Fund (VTIAX)
  • Vanguard Total Bond Market Fund (VBTLX)

Sometimes, people will talk about a four-fund portfolio. That’s a three-fund portfolio plus an international bond component, like the Vanguard Total International Bond Index (VTABX).

I list Vanguard mutual funds but you can invest with exchange-traded funds (ETFs) too (here’s a longer article on the differences between ETFs and mutual funds). They’re functionally the same and ETFs may be a little cheaper.

The ETFs are:

  • Vanguard Total Stock Market ETF (VTI)
  • Vanguard Total International Stock ETF (VXUS)
  • Vanguard Total Bond Market Fund (BND)
  • Vanguard Total International Bond Index (BNDX)

How do I set my allocation?

Great question!

I think there’s no better answer than to fill out this 12-question investor questionnaire from Vanguard.

Alternatively, you can use the very simple 120 minus your age as the stock percentage. A 40-year-old would put 80% stocks and 20% bonds.

Larimore, in his book, offers the rule that you should hold your age in bonds. So, a 40-year-old would put 60% stocks and 40% bonds.

That will tell you the percentage of stocks and bonds. Larimore, and Vanguard research on international equity, suggests a 20% international allocation where you can decide how much international exposure you’d prefer, but from there the math is easy.

If you were given an 80% stock, 20% bond and wanted to have a 20% international allocation, this is how’d you invest into the three funds:

  • Total Stock Market (VTSAX) – 64%
  • Total International Stock (VTIAX) – 16%
  • Total Bond Market Fund (VBTLX) – 20%

Other “Lazy” Porfolios

The three-fund portfolio is one of the more famous “lazy portfolios” but you’ve probably heard of others like Scott Burns’ Couch Potato portfolio or Rick Ferri’s Lazy portfolio or his “Core Four” portfolio. They’re great names but fundamentally the same idea – a small number of low-cost index funds with minimal (or no) overlap.

Scott Burns’ Couch Potato is an even split of Vanguard Inflation-Protected Securities Fund (VIPSX), Vanguard Total Stock Market Index Fund (VTSAX), and Vanguard Total International Stock Index Fund (VTIAX).

Rick Ferri’s Core Four consists of the three-fund portfolio plus a Vanguard REIT Index Fund (VGSLX).

As you can see, most are pretty simple, elegantly lazy, and have fun names.

Is It Really That Simple?

Yes.

The hard part is convincing yourself you only need three or four funds. We’ve all been trained to think that investing is super complicated, you need a ton of training and education, and you can’t do it yourself.

Some people make more money when you think it’s complicated.

The more complicated way = more hands in your pocket.

Stockbrokers make money when you buy and sell a stock. Actively managed mutual funds take a little slice off the top of your investment, whether it’s up or down on the year. Hedge funds take a small percentage of the total assets plus a bigger percentage of the gains.

Everyone is making money off your money.

Then you have a guy like Jack Bogle, founder of Vanguard, who says you can get the entire S&P 500 index (VTSAX) and pay just 0.04% a year. You can even buy and sell shares for free.

For every $1,000 you invest, you pay forty cents. FORTY CENTS.

That’s why Vanguard has trillions in assets under management. And why every major mutual fund company, like Fidelity, also has a similar product with a similar expense ratio.

And all you need are a handful of funds to save for retirement.

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About Jim Wang

Jim Wang is a thirty-something father of four who is a frequent contributor to Forbes and Vanguard's Blog. He has also been fortunate to have appeared in the New York Times, Baltimore Sun, Entrepreneur, and Marketplace Money.

Jim has a B.S. in Computer Science and Economics from Carnegie Mellon University, an M.S. in Information Technology - Software Engineering from Carnegie Mellon University, as well as a Masters in Business Administration from Johns Hopkins University. His approach to personal finance is that of an engineer, breaking down complex subjects into bite-sized easily understood concepts that you can use in your daily life.

One of his favorite tools (here's my treasure chest of tools,, everything I use) is Personal Capital, which enables him to manage his finances in just 15-minutes each month. They also offer financial planning, such as a Retirement Planning Tool that can tell you if you're on track to retire when you want. It's free.

He is also diversifying his investment portfolio by adding a little bit of real estate. But not rental homes, because he doesn't want a second job, it's diversified small investments in a few commercial properties and farms in Illinois, Louisiana, and California through AcreTrader.

Recently, he's invested in a few pieces of art on Masterworks too.

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  1. Black Jogal says

    Great article, but what about ‘non-US’ investors. Eg in the UK. Should we use the FTSE all share as our ‘domestic’ component? I assume the international equities and bonds remain the same…

      • BlackJogal says

        Er… yes, I know. I’m asking if you have an opinion on whether non-USA investors should use the US stock market (eg VTI) as the ‘domestic’ component, or whether they should actually go domestic (and use, for example, the FTSE all-share, for people in the UK).

          • BlackJogal says

            Thanks dude. I’d say you’re more qualified than you might think! If a Yank went with 33% SPY, and 33% in an international tracker that excludes the US along with 34% in an int bond fund like GLAB, they’d be understating the US’s weighting in the world stock markets by 40% or more. After all, the US market makes is about half the world by cap. If he goes with an international fund that includes the US, he’s basically holding 50% US of A, so he might as well just go 2 funds, and hold VWRL and GLAB.

          • Jim Wang says

            That’s a good point. I think the key idea is that you can achieve the vast majority of your investment goals with simple investments, rather than the mish-mash of stuff many of the roboadvisors recommend. You’re right about the overlap though and that’s not to be overlooked.

            And thank you for the compliment. 🙂

  2. Karl Shih says

    Hi Jim,

    Great article, just thinking the similar investment.

    Please suggest if it’s still the right time to invest now, even US stock market is pretty high at this period of time.

    I am 47 years now, thinking the same portfolio you mentioned (VTI , VXUS, BND and BNDX) for future 10-15 years investment before get retired. But still thinking the right time and percentage to invest, please recommend.

    Thanks!

    • Jim Wang says

      I’m afraid I can’t offer that type of specific advice but given the time frame, I don’t see a problem with keeping to a simple portfolio. I know the market seems “high” but it was high a year ago and now the S&P 500 is up 25% YTD. You can’t predict this stuff, no matter how hard you try, and the best advice is to look at your horizon and invest according to that.

      I would reach out to an advisor given your 10-15 year time horizon for the best advice. My time horizon is 20+ years, so I am 100% confident it’ll be OK even if there is a drop in the next few years. It’ll recover within 20 years.

  3. Harrison Wintergreen says

    A Bogleheads three fund portfolio is not a terrible option, but it does have some disadvantages.

    VTIAX and VTSAX are both very top heavy with weighted averages in the large/giant cap category. Thus minimal small cap exposure in the ~5% range, but small cap tends to dramatically outperform large cap over time. Even among low cost index funds there are many with more small cap coverage with growth rates that beat VTSAX over long periods (e.g. VIEIX, VSMAX and FSSNX)

    The ‘subtract your age from 120 or 100 for bond ratios’ is decades out of date. Bond yields are now so low that they barely keep up with inflation and more current research finds 100% stocks is better in the long-term than 50/50 bonds. See “Why Stocks, Not Bonds, Assure Less Risk in Retirement” by Dave S. Gilreath, ABCNews dot com from May 20, 2014,

  4. Uri Trullas says

    Hi Jim,

    First of all thank for your blog, it is great. I have a 3 index fund portfolio, in which 10% are emerging markets, the rest are global stocks and bonds. I am considering to simplify even more the portfolio and take out the emerging markets index fund. Do you think it makes a big difference in the long run when it comes to returns?

    • Jim Wang says

      I think any change in strategy will affect your returns but it’s hard to say if it’ll increase or decrease them. By adding in some emerging markets, I’d expect the volatility/risk and returns to both be higher… but no one can see the future! 🙂

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