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Most retirees are familiar with the 4% rule.The 4% rule has some blind spots. It assumes a 30-year retirement, but some retirees will need their money to last longer than thatIt’s the guide many financial pros have extolled for decades for the decumulation phase of retirement—the time when you finally start tapping the money you’ve spent decades (ideally) saving and investing.Withdraw 4% of your portfolio in the first year of retirement, then adjust that amount for inflation every year thereafter. If your portfolio starts out at $1 million, for instance, you spend $40,000 the first year, then $40,000 plus inflation the next year, and so on.The rule was devised in 1994 by financial adviser William Bengen after research showed that retirees with a balanced stock-and-bond portfolio who followed that math wouldn’t have run out of money over any 30-year period since 1926—even when economic conditions were bad.It’s pretty simple. Maybe too simple.The 4% rule has some blind spots. It assumes a 30-year retirement, but some retirees will need their money to last longer than that. It also assumes the markets will perform as well as they have over the past century. As a result, researchers have been lowering or raising the figure for years. Investment research firm Morningstar revises its estimate annually; it was 3.3% in 2021 and 3.9% this year. Bengen himself has said that a safe number could now be 4.7%.The rule’s deeper problem is its rigidity. Your portfolio amount could double in a market boom during retirement and the rule would still limit you to the same inflation-adjusted amount, which would be unnecessarily frugal. More concerning, your assets could fall by a third and the rule wouldn’t tell you to curtail your spending. You would have to liquidate a bigger portion of your portfolio to withdraw the prescribed amount. If that happens a few years in a row, you run a real risk of eventually outliving your money, despite what the historical data say.The good news is that there are ways to make retirement spending more responsive to how long you’re likely to live and how markets perform. Use the 4% rule as a reference point, rather than have it be the full plan.Your life expectancy mattersInstead of spending a fixed inflation-adjusted dollar amount every year, you need to factor in your life expectancy and the size of your portfolio and then adjust accordingly.You divide your current portfolio balance by the number of years you can expect to live, and spend that much in the coming year. The following year, you do the math again with your new portfolio balance and your new remaining life expectancy. (You can find your life expectancy at your current age in the Social Security Administration’s life tables, which are updated annually. Keep in mind that tables don’t apply to any specific person; they don’t factor in health issues or family medical history. You may want to be conservative and go beyond your life expectancy, or take a chance and reduce it.)If you’re a 70-year-old woman, for instance, your remaining life expectancy is about 16 years. So you would divide your portfolio into sixteenths and spend one of them this year. A year later, you would recalculate using your new balance and your new life expectancy of 15 years, and so on. This allows your spending to rise when your portfolio is up and fall when it’s down.This actuarial approach lessens the chance you’ll run out of money, and it lets good market returns flow through to higher spending.Spending too much—or not enoughBut it introduces a new problem: too much fluctuation in your spending.If markets drop 30% in a bad year, your spending drops by roughly 30%, too. If markets surge in a year when the life tables say your remaining expectancy is five years, the formula tells you to spend a fifth of your portfolio—probably far more than you need or want.The fix is to put guardrails on the actuarial approach, using the 4% rule as your anchor. You set an upper and lower band aro
