Safe Withdrawal Rate Failure

What happens if your Safe Withdrawal Rate (SWR) is too high? A look at history and some tips for recovery.
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Video Summary

Success Rates of SWRs

In our post about Safe Withdrawal Rate (SWR), we showed relatively high success rates* for a 5% SWR with a mixed portfolio of stocks/bonds. But that was using simulated returns.

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This chart shows the success rates using historical data going back to 1920. This portfolio is using 50% S&P500, and 50% bonds.

But what does 90% success for a 5% SWR mean? What does failure look like?

* This is not an endorsement for a 5% SWR. The intent is to show what happens when your SWR is too high.


Some Simulation Details

The modeled portfolio consists of 50% S&P500, and 50% bonds. (The actual simulation uses the 10YR U.S. Treasury rates + 1.0% as a proxy for investment grade corporate bonds. Reference: AAA vs 10YR Yield)

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The chart shows nominal and real returns of this portfolio since 1913.

A 30 year retirement is modeled for years prior to 1995 after which the model stops at 2025.

Inflation matters

Note that in the 1960’s, nominal returns seem to follow the general upward trend, but the real return is flat. The nominal returns were similar to inflation; purchasing power stayed flat.


Failures Aren’t Random

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This chart shows success/failures mapped onto the real return data; red means a retirement that started that year ran out of money.

Note that the “failure year” is the starting year of retirement, not the year the balance hit zero.

Key finding

The failures are clustered: 1937, 1962-69 (most years), 1973, 2000


Failure Details

  • Failures occurred when retirement started in the years: 1937, 1962, 1964, 1965, 1966, 1967, 1968, 1969, 1973, 2000
  • Years until failure: 24, 29, 29, 26, 24, 28, 24, 23, 28, 24
  • 4 of 10 failures occurred in years 28-30; so close…
  • All failures occurred at year 23 or later.

Critical insight

The failures occurred deep into retirement, long after the SWR was chosen. It would have been easy to not see failure coming until it was too late.


Key Finding

The failures all occur when retirements start prior to a long period of near zero real returns. See the following charts...

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How did you go bankrupt?

Two ways. Gradually, then suddenly

Ernest Hemingway, The Sun Also Rises, 1926


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The above charts show the simulated balance vs time; the top chart is all runs, while the bottom chart is ONLY failing runs.

At 15 years into retirement (180 months), the failing simulations had depleted the account to around half it starting value


Insights on a 5% SWR, and 90% Success

5% is robust-ish

  • It survived the Great Depression years.
  • There were three periods of extended low real return that produced clusters of failures.

Beware of low real returns

  • History shows that the periods of low real return have been more dangerous than large corrections which recover (Depression, Great Financial Crisis).
  • Keep an eye on REAL returns and adjust spending/income if needed.

Timing

  • You may not time the market, but it may time you.
  • Timing plays a critical role in having a successful retirement.

What if Timing Fails?

  • Compare your SWR inflation adjustments to investment returns. If real returns are near zero for more than a few years, reduce spending or increase income (go back to work).
  • Going back to work doesn’t have to mean full time and your old career. You need enough to get your SWR down enough to ride out the economic cycle.
  • Reducing your SWR from 5% to 3.5% means you need to generate 30% of your income. (5%-3.5%)/5% = 30%.
  • Make sure you are considering all your investment options. Just because your economy is bad doesn’t mean other markets aren’t doing better.

Key Takeaways

This analysis focuses on a 5% SWR, only to demonstrate what failure looks like.

  • Failure is likely to happen deep into retirement, at a time you may not be able or willing to return to work.
  • Keep your SWR conservative (not 5%) and aim to allow a better lifestyle to come from a conservative SWR on a balance that has compounded, and thus you are getting more income from the conservative SWR.
  • Monitor real returns to make sure your withdrawal rate is actually safe; adjust spending/income if needed.
  • Monitor returns in alternative investments/markets, stay diversified.

Adjusting Your SWR

There are several proposals for how to deal with failing scenarios, generally using some type of “guardrails” approach. The idea is to formulaically change your SWR based on particular rates of return.

Our preference, aligned with our “keep it simple, keep it memorable” approach is to reevaluate your withdrawal rate each year and verify it is still a SWR; in particular take action if your withdrawal rate increased too much due to loss of principal.

That begs the question, how does SWR change as retirement horizon reduces. That will be the subject of one of our next posts.


If 5% Isn’t so Bad, What About 6%?

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The success rate drops to 67%, the failure clusters get longer, and failure occurs as soon as about 16 years.

Kids - DO NOT try this at home


Wait - What Were The Best Cases?

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Earlier we showed the chart above, with account balances plotted vs time.

The astute reader will ask “there are cases where the account value INCREASES to $2M-3M?”.

The answer is “yes”.

More details regarding that in an upcoming analysis.


Ready to learn more?

See a list of recent blogs on our home page.

Or, dive deeper into investing, saving, and withdrawal strategies through our comprehensive Curriculum.


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Disclaimer

For Educational Purposes Only: All content on this site, including articles, tools, and simulations, is for informational and educational purposes only. It should not be construed as financial, investment, legal, or tax advice. The information provided is general in nature and not tailored to any individual's specific circumstances.

Software Development Has Inherent Risks: The software used to perform the analyses may have errors or inaccuracies. When we post updates to any material, errors or inaccuracies that are subsequently fixed may change the results.

No Guarantees & Risk of Loss: The analyses and simulations presented are based on historical data. Past performance is not an indicator or guarantee of future results. All investing involves risk, including the possible loss of principal. Market conditions are subject to change, and the future may not resemble the past.

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View Video Transcript

When you're planning for retirement, there is one giant kind of scary question, right? How do you make your money last? Today we are going to dig into a really popular rule of thumb that promises an easy answer. But we're also going to see what a hundred years of data tells us about when that promise can go really, really wrong. You know, the biggest challenge in retirement is turning that pile of savings you've built up into a steady paycheck that you can outlive. It's a super complex problem. But for decades, people have been looking for a simple fix. You know, that one single number they can just trust. Okay, let's make this real. Imagine this is you. You've worked your tail off. You've saved a million bucks. So now what? Can you spend $30,000 a year? 50,000? How about 70? If you pick the wrong number, well, the consequences are severe. This is the question that keeps people up at night. And that brings us to this key idea, the safe withdrawal rate, or SWR for short. It's supposed to be the magic percentage that lets you sleep easy knowing your money is going to last as long as you do. The whole goal is to find the highest S SWR that is still, you know, safe. So, what does history actually tell us? Well, if you look at the data going all the way back to 1920, it's incredibly reassuring, at least at first. A 3% or a 4% withdrawal rate has literally never failed over a 30-year period. A perfect 100% success rate. I mean, that feels like a guarantee, doesn't it? Now, here's where it gets really interesting. What happens when we push that number to 5%. Historically, even a 5% rate has worked 90% of the time. Think about that for a second. Nine times out of 10, you would have been totally fine. Those sounds like pretty good odds, right? So, what's the catch? Well, the catch is that 10% failure rate. Because when we're talking about your entire life savings, a 1 in 10 chance of running out of money isn't just a statistic. It's a potential disaster. We've got to understand what exactly goes wrong in that 10% of cases. So, let's ask the most important question here. Is it just random bad luck? You know, a stock market crash here, a little inflation there, or is there a specific identifiable pattern to why these retirement plans fail? And the answer, when you look at the data, is surprisingly clear. These failures, they aren't random at all. They're caused by one specific thing. Starting your retirement at the absolute worst possible time. This chart just illustrates the point perfectly. It maps out every single possible 30-year retirement simulation since 1920. Each green line is a success story. Each red line, well, that's a failure. But notice something. The red isn't just sprinkled around randomly. It's all clumped together in these few distinct dangerous periods. This is our first major clue. Okay, so let's put on our detective hats and dig into this. If these failures are all clustered together, they have to share a common cause. So, what is this hidden danger that connects these specific moments in history? Okay, on the left, you're seeing historical investment returns. That light blue line is the one to watch. It shows your return after inflation. Now, look at the chart on the right with our red failure zones. See how right before each red cluster kicks off, that light blue line on the left just goes totally flat for years? That's it. That's the connection. And this brings us to the real villain of our story. A long period of near zero real returns. It really doesn't matter if your portfolio goes up 7% on paper if inflation is also 7%. Your purchasing power, your ability to actually go out and buy stuff has gone absolutely nowhere. This is the danger hiding just below the surface. And here they are, the specific start years for retirements that failed with that 5% withdrawal rate. Every single one of these, 1937, the late60s, 1973, and the year 2000, was like a starting pistol for a long grinding period where your investments just could not outrun inflation. It was the definition of bad timing. So, we found the culprit. Now, let's look at the anatomy of these failures. Because it's one thing to see them on a historical chart, but what does this slow grind of low real returns actually do to a retireese's bank account year after year? This famous line from Ernest Hemingway just perfectly captures the terrifying nature of these retirement failures. It isn't one single dramatic market crash that does all the damage. It's a slow, silent erosion that builds for decades before the floor just completely falls out from under you. First, let's look at the 90% of cases that actually worked out. In these scenarios, that starting $1 million portfolio either stays pretty level or in a lot of cases, it actually grows over the 30 years. This is what success looks like and it's the most common outcome which is good news. By now look at the failures. These are the 10% that ran out of money. For the first 15, maybe even 20 years. The decline is slow. It doesn't look like a five alarm fire. But then the portfolio hits a tipping point and just collapses gradually and then all at once. And here's the most crucial point. In every single one of these historical failures, the money didn't run out until deep into retirement. We're talking 23, 26, even 29 years in. The real danger is that you'd feel safe for two whole decades thinking your plan was working with absolutely no idea you are on a collision course with disaster. Okay, that was the bad news. I know. But understanding the risk is the very first step to managing it. Now that we've unmasked the culprit, let's talk about a simple, actionable strategy you can use to protect your own retirement. Here is your three-step survival guide. First, just be more conservative. Start with a rate that has a better track record, something like 4%. Second, monitor what actually matters, those real returns. If you see your investments are struggling to beat inflation for a few years in a row, that is your big warning sign. And third, be flexible. Having a plan to temporarily cut back on spending could be the one thing that saves your entire retirement. And hey, if you need any more convincing on being conservative, just look what happens if you get a little more aggressive and try a 6% withdrawal rate. The success rate just plummets from 90% all the way down to 67%. A third of all retirements would have failed. And failure happens way faster, as early as 16 years in. That tiny 1% difference has a massive impact on your risk. And visually, the danger is even more stark. Remember that chart with the red failure clusters for the 5% rate? This is the same chart, but for a 6% rate. Just look at all that extra red. The clusters of failure get so much bigger and they trap even more retirement start years. It is a powerful picture of how quickly your margin of safety can disappear. So, the ultimate takeaway here is this. Retirement planning cannot be a set it and forget it strategy. The whole idea of one magic number is a myth. The real key to success is staying aware of the economic conditions, especially those real returns, and being flexible enough to adapt your plan when you have to. You know, we've spent all this time focused on that scary 10% of cases that ended in failure. But that begs one final really fascinating question. If bad timing can lead to ruin, what does good timing lead to? What happened to the portfolios that started in the very best years in history?