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What Warren Buffett's stock market math means for your retirement

What do Warren Buffett's stock projections mean for your retirement savings? Save plenty for retirement, Hamm writes, and start saving now.

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Cliff Owen/AP/File
Warren Buffett, chairman and CEO of Berkshire Hathaway, Inc., speaks during the Economic Club of Washington's 25th anniversary celebration dinner in Washington. Buffett's stock market predictions can help guide retirement savings decisions.

A few weeks ago, I聽听补听听补产辞耻迟 Warren Buffett鈥檚 projections for the stock market over the long term. Here鈥檚 a refresher on what Buffett said:

鈥淭丑别 economy, as measured by gross domestic product, can be expected to grow at an annual rate of about 3 percent over the long term, and inflation of 2 percent would push nominal GDP growth to 5 percent, Buffett said. Stocks will probably rise at about that rate and dividend payments will boost total returns to 6 percent to 7 percent, he said.鈥

Let鈥檚 assume that Buffett is exactly right with his predictions. What does that mean for retirement savings?

First, we have to make a few assumptions. Let鈥檚 assume that you鈥檙e going to want to be able to withdraw 60% of your salary each year for 25 years out of your retirement savings when you retire, so we鈥檒l use that as a target amount.聽

We鈥檒l also assume, for convenience, that you鈥檙e going to be invested entirely in a broad-based index fund until the day you retire and then you鈥檒l switch everything to more secure investments that will just match inflation.

We鈥檙e also going to assume that the return Buffett describes is steady. The stock market is volatile year over year, but over a very long term, it鈥檚 not that terrible. I鈥檓 also going to assume that you get half of the return during the year you invest it because it鈥檚 so steady (since most people contribute throughout the year, not in one lump sum at the end).

We鈥檒l also rip inflation out of the question. Buffett states that a stock market investment will earn about 3% per year outside of inflation plus an additional 1.5% in dividends, so let鈥檚 use that. We鈥檒l ignore inflation and assume that the stock market will rise faster if inflation goes up to match it, as Buffett predicts.

So, what we鈥檙e left with is that every dollar we put into retirement is going to earn a 4.5% annual return beyond inflation in the stock market 鈥 the 3% growth plus 1.5% dividends that Buffett predicts. However, we don鈥檛 have to worry about inflation at all 鈥 we鈥檙e just going to try to match our current salary in retirement.

Let鈥檚 say Bob is making $50,000 a year. In order to be able to pull out 60% of that per year for 25 years, Bob will need to have $750,000 in retirement savings. What will Bob have to save each year to make his dream of retiring at age 65 with long-term security come true?

What if Bob is 50? That means he has fifteen years to reach that $750,000 target. To reach that target in that timeframe, Bob would have to sock away聽$33,000 per year.聽This would give him $766,607.22 over the course of those fifteen years. Bob would have to put away almost all of his take-home pay into retirement to make that goal, so that鈥檚 probably unrealistic.

Let鈥檚 back off a bit and say that Bob is 40. That means he has twenty five years to reach that $750,000 target. To reach his target in that timeframe, Bob needs to save聽$15,500 per year, or about 30% of his annual salary, to make that target. This would give him $753,935.25 after those twenty five years.

What if Bob is 35? To reach that target, Bob needs to save聽$11,300 per year, giving him $748,165.28 after those thirty years.

What if Bob is 30? To reach the big $750,000 target, Bob merely needs to save聽$8,500 per year, giving him $748,872.57 at retirement.

Even at age 25, the savings are intense. To reach that target at retirement, Bob needs to sock away聽$6,500 per year, giving him $750,007.30 at retirement. That鈥檚 still 13% of Bob鈥檚 salary.

In other words,聽if you believe in Buffett鈥檚 numbers instead some of the more rosy projections, you should be saving as much as possible for retirement.

Why such a different picture than the 10% or 15% suggestions that investment managers often give? Those managers are using overoptimistic approaches, as noted in that article:

鈥淭丑别 Standard & Poor鈥檚 500 Index, a benchmark for U.S. stocks, surged 18 percent a year on average from 1982 to 1999. The bull market tainted investor expectations, Buffett said. Polls in the late 1990s showed some investors expected stocks to gain 14 percent to 15 percent a year, he said.

鈥溾楾hinking that in a low-inflation environment is dreaming,鈥 he said.鈥

Retirement advice that indicates that you鈥檒l be fine by just saving 10% of your income starting at age 40 is using unrealistic assumptions, at least from Buffett鈥檚 perspective.

Save plenty for retirement, and start saving now.

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