3373: [Part 1] Rethinking the 4 Percent Safe Withdrawal Rule by Fritz Gilbert of The Retirement Manifesto

Summary

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Podcast Summary: Optimal Finance Daily, Ep. 3373

Title: [Part 1] Rethinking the 4 Percent Safe Withdrawal Rule
Host: Diania Merriam
Guest Blogger: Fritz Gilbert (The Retirement Manifesto)
Date: December 2, 2025

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Episode Overview

This episode delves into Fritz Gilbert’s critical perspective on the often-cited “4% safe withdrawal rule” for retirement spending. Diania Merriam reads and reacts to Gilbert’s post, laying out why this foundational rule may not be as “safe” as it once seemed, especially amid today’s volatile and uncertain market conditions. The episode ends with Diania’s personal reflections and a teaser for part two, offering both practical insight and a candid look at how real retirees feel about their financial decisions.

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Key Discussion Points & Insights

1. The 4% Rule – What Is It?

• Origin & Simplicity:
  • Gilbert explains that the 4% rule, rooted in the 1998 Trinity Study, posits:

    “If you have a million dollars, the 4% safe withdrawal rule says you can spend $40,000 or 4% of 1 million in year one of retirement. Increase your spending by the rate of inflation each year and you'll never run out of money. Simple indeed.” (Fritz Gilbert, 01:10)

2. Concerns About the 4% Rule (Gilbert’s Perspective)

• Outdated Assumptions:

  • The rule is based on market data from 1926-1992. Gilbert cautions against relying on past performance to predict future returns, noting today’s market conditions are markedly different.

    “…relying on past performance to predict future returns can mislead the investor, especially given the unique valuations in today's markets.” (02:10)

• Current Market Valuations & Expected Returns:

  • Cites research (Vanguard, GMO, Wealth of Common Sense) warning of potentially very low returns because of elevated valuations (CAPE ratio).

    “Based on today's CAPE ratio, the historical correlation suggests the forward total returns over the next 10 years could be close to zero.” (03:52)

• Bond Risks:

  • Rising interest rates would hurt bond prices.

    “If you're holding 60% stocks and 40% bonds, it's possible that you could see decreases in both asset classes.” (04:36)

• Inflation and Withdrawal Adjustments:

  • Criticizes the rule’s advice to increase withdrawals annually with inflation, especially when returns are weak:

    “Based on the 4% safe withdrawal rule, you would be increasing spending next year based on the higher inflation rate, which could well be the same time you're seeing lower than expected returns.” (05:37)

    • “I don't know about you, but that doesn't sit well with me.” (05:55)

3. Upcoming Modifications & Practical Guidance

• Gilbert promises practical alternatives:

  “It wouldn't be fair to cite my concerns with the 4% safe withdrawal rule without suggesting an alternative. Following are the three modifications I'd suggest for your consideration. I am applying all three of these modifications in our personal retirement strategy. Hear those on tomorrow's episode.” (06:10)

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Diania Merriam’s Commentary and Community Reflections (08:33)

• Financial Media Warnings:

  • Diania underscores skepticism about “doom and gloom” predictions:

    “…the talking heads of the financial media have said things are overvalued since the beginning of time. Past performance isn't representative of future returns, but also no one can predict the future.” (08:40)

• Real-World FIRE Experiences:

  • Shares insights from a recent CampFI event, where many early retirees found their largest issue wasn’t running out of money—but having saved “way too much”—as fear led them to over-prepare. Now, their practical struggles are with optimizing tax strategies and drawdowns, not with sustainability of withdrawals.

    “The overwhelming issue that most people in the room had was realizing that they actually saved way too much money, and this was largely due to the fear-based thinking represented in this article. Now their main challenge is figuring out how to pull from the right buckets and do Roth conversions at the right time to minimize their tax burden.” (09:00)

• A New Perspective on Over-Saving:

  • Diania points out that in the FIRE community, the real risk can sometimes be working too long out of caution:

    “And I think the bigger challenge for people in the FIRE community in particular is a tendency to work longer just in case, even when they hit their goal number and really want to quit.” (09:25)

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Notable Quotes

• Fritz Gilbert:

  “Simplicity comes at a potentially very serious cost, like potentially running out of money in retirement.” (01:25)

  “Scary stuff for someone who's planning on equity growth to pay for their retirement expenses. Scary stuff for someone who's committed to the 4% safe withdrawal rule.” (03:55)

• Diania Merriam:

  “No one can predict the future. Go back in history and count how many times the financial media has warned that the end is near, the party is over, and that we better buckle up for a long road of suboptimal returns. Maybe it's true that we'll have zero returns for the next 10 years, but no one can actually predict that.” (08:43)

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Timestamps for Important Segments

• [01:05-06:10] – Fritz Gilbert’s critique of the 4% rule, breakdown of market and inflation concerns.
• [08:33-09:30] – Diania’s postscript: real-world reactions to withdrawal fears, over-saving, and practical retirement drawdowns.

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Tone & Language

The episode is direct, evidence-based, and reflective. Fritz Gilbert’s blog is analytical but approachable, while Diania Merriam adds warmth and real-life context—relating the technical advice to experiences within the FIRE (Financial Independence, Retire Early) community.

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Conclusion

This episode critiques the assumptions behind the 4% rule for safe retirement withdrawals, highlighting the risks of applying dated heuristics to modern, volatile markets and stressing the psychological side of financial independence. Part two will offer actionable alternatives for more flexible, responsive withdrawal strategies.

Transcript

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[Fritz Gilbert]

This is optimal Finance Daily Rethinking the 4% safe withdrawal rule Part 1 by Fritz Gilbert of TheRetirement Manifesto.com the 4% safe withdrawal rule is a well known rule of thumb for those planning for retirement. One thing it has going for it is that it's simple to apply if you have a million dollars. The 4% safe withdrawal rule says you can spend $40,000 or 4% of 1 million in year one of retirement. Increase your spending by the rate of inflation each year and you'll never run out of money. Simple indeed. But I'd argue that simplicity comes at a potentially very serious cost, like potentially running out of money in retirement. Today I'll present my argument against the 4% safe withdrawal rule given our current economic situation, and propose three modifications I'd recommend as you determine how much you can safely spend in retirement. Rethinking the 4% safe withdrawal rule I read a lot of information on retirement planning and lately I've been seeing more content challenging the 4% safe withdrawal rule. I agree with those concerns and felt a post outlining my position was warranted. As a brief background, the 4% safe withdrawal rule is based on the Trinity Study, which appeared in an article by William bergen in the February 1998 issue of the Journal of the American association of Individual Investors. The conclusion based on the study is summarized as Assuming a minimum requirement of 30 years of portfolio longevity, a first year withdrawal of 4% followed by inflation adjusted withdrawals in subsequent years, should be safe. My concerns with the 4% safe withdrawal rule in short, some key factors about the study are relevant, especially as we rethink the 4% safe withdrawal rule. It's based on historical market performance from 1926 to 1992. My concern relying on past performance to predict future returns can mislead the investor, especially given the unique valuations in today's markets. This point is driven home by a recent Vanguard article that projects future returns based on current market valuations. If you think the Vanguard outlook is depressing, check out the forecast from GMO as presented in the wealth of Common Sense article titled the Worst Stock and Bond Returns Ever. Why are Future Returns Expected to be Below Average? The biggest driver for the projected below average returns is the high valuation in today's equity market, particularly in the usa, and the fact that interest rate increases would negatively impact bond yield. In my view, the CAPE ratio is one of the best indicators of market valuations. The reason current valuations matter is the fact that they're highly correlated to future returns. Based on today's CAPE ratio, the historical correlation suggests the forward total returns over the next 10 years could be close to zero. Scary stuff for someone who's planning on equity growth to pay for their retirement expenses. Scary stuff for someone who's committed to the 4% safe withdrawal rule. In addition to the bearish outlook for US equities, bonds could be negatively impacted when interest rates increase. Bond prices are inversely related to interest rates, so as rates go up, bond prices go down. So if you're holding 60% stocks and 40% bonds, it's possible that you could see decreases in both asset classes. As cited in this Market Watch article, the Fed has begun signaling that interest rates are on the table for 2022, especially if the current bout of inflation proves to be less than a transitory event. For the record, I suspect it will be more than transitory, but what do I know? This brings us to the next concern. My other big concern with the 4% safe withdrawal rule. In addition to my previously mentioned concern, the risk of an extended period of below average market returns. I don't like the part of the rule which states you should increase your spending the following year based on the rate of inflation. As most of you know, inflation has been on a bit of a tear lately. Based on the 4% safe withdrawal rule, you would be increasing spending next year based on the higher inflation rate, which could well be the same time you're seeing lower than expected returns. I don't know about you, but that doesn't sit well with me. My suggested modifications to the 4% safe withdrawal rule it wouldn't be fair to cite my concerns with the 4% safe withdrawal rule without suggesting an alternative. Following are the three modifications I'd suggest for your consideration. I am applying all three of these modifications in our personal retirement strategy. Hear those on tomorrow's episode. You just listened to part one of the post titled Rethinking the 4% safe withdrawal rule by Fritz Gilbert of TheRetirementManifesto.com.

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[Fritz Gilbert]

The 4% rule is a hot topic right now. Firstly, the talking heads of the financial media have said things are overvalued since the beginning of time. Past performance isn't representative of future returns, but also no one can predict the future. Go back in history and count how many times the financial media has warned that the end is near, the party is over, and that we better buckle up for a long road of suboptimal returns. Maybe it's true that we'll have zero returns for the next 10 years, but no one can actually predict that. It's interesting to read this article after coming back from a campfi event where half the attendees retired early and are actively drawing down from their portfolios using a guideline like the 4% rule. Guideline being the key word here. More on that in tomorrow's commentary. The overwhelming issue that most people in the room had was realizing that they actually saved way too much money, and this was largely due to the fear based thinking represented in this article. Now their main challenge is figuring out how to pull from the right buckets and do Roth conversions at the right time to minimize their tax burden. I'm sure there are many people who worry they haven't saved enough for retirement, but certainly not everyone. And I think the bigger challenge for people in the fire community in particular is a tendency to work longer just in case, even when they hit their goal number and really want to quit. I'll have more thoughts for you on this tomorrow. That should do it for today. Have a happy rest of your day and I'll see you on the Wednesday show tomorrow, where we'll finish up this post and where your optimal life awaits.