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You’ve done everything right. You saved consistently, avoided the obvious mistakes, and now you’re approaching retirement with a number in your account that would have seemed unimaginable 20 years ago.
You’ve heard about the 4% rule — withdraw 4% of your portfolio annually, adjusted for inflation — and you’re planning to follow it carefully.
That caution might cost you more than you think.
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The problem with playing it safe
The 4% rule wasn’t designed to optimize your retirement. It was designed to survive the worst retirement in recorded history — including the Great Depression, the stagflation of the 1970s, and every other catastrophic sequence of market returns going back to the 1870s. It’s the floor, not the target.
When you plan for the worst and the worst never arrives — which is most of the time — you end up dramatically underspending. Research by financial planner Michael Kitces found that a retiree withdrawing at 4% is equally likely to finish a 30-year retirement with less than their starting balance as they are to finish with more than six times the original total.
The median outcome isn’t scraping by. It’s finishing with nearly triple your starting principle, after three decades of inflation-adjusted spending.
That unspent wealth isn’t sitting in a bank waiting for you. It’s years of trips not taken, grandchildren’s educations not funded, experiences permanently out of reach because you spent your most active retirement years spending less than you could have.
Why this happens
Most retirement income plans are built to answer one question: Will I run out of money? That’s the right question to start with; it’s the wrong question at which to stop.
A plan built only around not running out of money is structurally blind to the other direction. Without explicit rules for when to spend more, most retirees default to spending less — year after year — regardless of what their portfolio is doing.
By the time it becomes obvious that the sequence was favorable, the window for enjoying it has often narrowed considerably.
Two ways to build spending flexibility into your plan
The solution isn’t to abandon caution — it’s to build rules in advance for both directions.
The ratchet rule is the simpler approach. Start with a conservative withdrawal rate, say 4%, but commit now to increasing it by a set amount — 10% is a common threshold — any time your portfolio grows 50% above where it started.
In a bad sequence, the trigger never fires, and your low rate protects you. In a good sequence, you give yourself a raise while you’re still healthy enough to enjoy it. The key is deciding this in advance, not in the moment when emotion can override the math.
The guardrails approach, developed by financial planner Jonathan Guyton, sets a range around your withdrawal rate. If your withdrawals as a percentage of your current portfolio rise above a ceiling — say, 6% — you pull back spending because you’re outpacing your portfolio’s growth.
If they fall below a floor — say, 4% — you increase spending because your portfolio is outpacing your withdrawals. The plan adjusts continuously as your actual sequence unfolds, rather than locking you into assumptions made on day one of retirement. Guyton’s research suggests guardrails allow initial withdrawal rates closer to 5% to 5.5% while maintaining strong plan sustainability.
Both approaches require the same thing: Deciding the rules before you need them. A plan you build in a calm moment will serve you better than one you improvise during a market swing.
What to do now
If you’re within 10 years of retirement or already in it, run your current withdrawal strategy through a Monte Carlo simulation — a tool that models thousands of possible market sequences rather than assuming a single average return. If your plan shows success rates above 90% across all scenarios, you might be leaving significant spending capacity on the table.
A success rate of 85% isn’t a failing grade. For many retirees, it’s the sweet spot between protection and living the retirement for which they saved.
The goal was never to accumulate as much as possible and spend as little as you could. Most people want two things from their retirement savings: a life well-lived, and something meaningful left behind.
A plan that’s too conservative can quietly rob you of the first without meaningfully improving the second.
