How to Find Your Perfect Withdrawal Rate Strategy

The 4% guideline is a frequently cited rule of thumb for retirement spending. And it is a decent starting point for assessing the adequacy of your retirement nest egg.

But it’s a blunt instrument: It’s built for a worst-case scenario in the markets, and most retirement time horizons aren’t a worst-case scenario. Starting with a too-low withdrawal rate and never wavering from it will tend to lead to significant underspending over most retirement time horizons.

Moreover, the notion of a retiree taking out the same amount on an inflation-adjusted basis year after year, as with the 4% guideline, doesn’t jibe with reality. Actual spending is lumpy and tends not to increase with inflation as people age. In addition, it’s human nature to pay attention to a portfolio’s value when deciding how much to spend. As Jonathan Guyton notes in my book How to Retire, that’s a rare behavioral impulse that aligns with what’s best from a financial perspective.

One of the overarching conclusions of our annual research report, “The State of Retirement Income,” is that retirees and their financial advisors should home in on a spending plan that factors in their goals, personal characteristics, and asset allocation.

Here are the key steps to take.

Step 1: Clarify your goals.

Are you looking to maximize your spending during your retirement, or is leaving an inheritance at the end of your life a major priority? These two goals are at odds with one another when it comes to retirement spending. Employing a dynamic spending system, taking less when your portfolio is down and especially more when it’s up and as you age, will yield higher lifetime withdrawals than a strategy where you employ a conservative initial withdrawal amount and adjust that dollar amount upward only to keep pace with inflation.

In our retirement spending research, a few strategies stood out for delivering a significant boost to lifetime spending. The probability-based guardrails strategy, which involves annually checking the portfolio’s probability of success and making upward and downward adjustments as needed, led to the highest lifetime withdrawals of any spending strategy we studied. The required minimum distribution method—portfolio value divided by life expectancy—also elevated lifetime spending.

On the flip side, the fixed real withdrawal (our “base case”) and the actual spending systems, the latter of which increases spending less than inflation and in line with retirees’ actual spending patterns, had the opposite results: the lowest lifetime spending and the biggest median balances at the end of 30 years.

However, it’s also worth noting that leaving an inheritance by underspending isn’t the best or most efficient way to set aside funds for a bequest. For one thing, these approaches aren’t guaranteed to deliver a big bequest if market performance is poor during the retiree’s drawdown period. Segregating bequest funds from a retiree’s spending portfolio, perhaps by setting up a fourth “last stop” bucket, is a more direct way to ensure leftover assets at the end of life.

Step 2: Establish how much volatility you are willing to tolerate in your cash flows.

Of course, there’s no free lunch. Despite higher lifetime withdrawals, dynamic spending systems carry an implicit drawback: You’ll have to adjust your paycheck periodically. Depending on the dynamic spending system, these adjustments range from quite infrequent and modest to those that are more extreme.

For people seeking cash flow stability, even if it means they’ll likely underspend during their lifetimes, something like our “base case” spending system could be the ticket: It entails no changes in real spending from year to year. The “actual spending” method, in which spending modestly declines in real terms each year, takes just a tiny step toward variability. The “forgo inflation adjustment” system also entails minimal spending changes; it calls for a retiree to skip the inflation adjustment in a year after the portfolio has declined in value. Any spending adjustments under this method are small because they amount to skipping upward adjustments, not reducing nominal spending from the year prior. That strategy delivers a modest boost in starting withdrawal rate versus our base case.

On the other hand, some of the strategies we examined entail more extreme cash flow volatility. The RMD method, for example, had one of the highest lifetime income streams of any strategy that we studied, but it also entails extreme volatility in cash flows from year to year. Those adjustments can be both positive (retirees get to spend more in most years as the portfolio gains and they age) and negative (retirees will often have to take less after portfolio losses, unless the life-expectancy increase offsets that amount).

When deciding how much volatility is acceptable, be sure to consider the role nonportfolio income sources will play in your overall spending. If a healthy share of your spending needs is covered by income sources like Social Security and/or a pension, you may well be able to tolerate more changes in your portfolio withdrawals because it’s only affecting part of your spending. I like the idea of aligning fixed spending line items like housing, insurance, utilities, and food costs with fixed sources of income. If Social Security and a pension are insufficient to meet those expenses, a basic low-cost fixed annuity can come into play to make up the difference.

Step 3: Consider your personal spending glide path.

Another consideration is how you expect your spending to play out as retirement unfolds. Will you spend more earlier in the go-go years of retirement? Data show that most retirements follow that pattern. As noted earlier, the actual spending method incorporates that pattern, though it also contributes to the lowest lifetime withdrawal amount of any strategy we tested. On the flip side, an RMD-style system does the opposite, ramping up withdrawals in line with declining life expectancy.

Additionally, consider how spending might change because of external factors. Your timing of Social Security is a big one: Delaying Social Security is one of the best ways to enlarge lifetime income. But if portfolio withdrawals are the sole source of income between retirement and when Social Security commences, that creates a conundrum for retirement spending decisions. On the one hand, employing a flexible strategy is a solid way to defend against the key risk in this scenario, sequence risk. On the other hand, without any other income sources during that period, major reductions in spending could be difficult to swallow. For retirees without other income while they wait to claim Social Security, like working or rental income, employing some type of “bridging” strategy—for example, with a Treasury Inflation-Protected Securities ladder covering five years’ worth of spending—can make sense.

Step 4: Determine an acceptable success rate.

An underdiscussed aspect of withdrawal planning is what kind of “success rate” you’ll employ. In our research, we target a 90% success rate: That means that if a given spending system and percentage leaves at least one penny at the end of the retirement drawdown period in 900 of 1,000 Monte Carlo simulations, it has a 90% success rate. That might sound too risky, but targeting a 100% success rate prompts a very stingy starting withdrawal—just 2.5% for a 30-year horizon versus 3.9% for our base case. Targeting a 100% success rate also points toward a very conservative asset allocation.

On the other hand, being willing to tolerate a lower success rate leads to higher starting withdrawals. For example, our base-case starting withdrawal jumps to 4.4% with an 80% success rate and 5.0% at 70%. Ideally, a retiree employing a lower starting success rate would plan to employ a spending system that regularly checks on the probability of success to ensure that it hasn’t dropped disastrously low. The probability-based guardrails method does just that, using annual reads on the probability of success to determine whether course corrections are in order. The approach, applied with a 75% success rate threshold, yielded admirable results in our tests, generating the highest lifetime withdrawal rate without extreme cash flow volatility.

Step 5: Factor in time horizon and asset allocation.

The preceding is all about articulating goals and preferences. But you also need to take your time horizon and portfolio’s asset allocation into account.

Start by assessing the number of years between your anticipated retirement date and year of death. The longer your planned retirement, the lower your initial withdrawal percentage should be. The standard planning guidance is a 30-year horizon, but people retiring in good health in their 50s should target at least 35 or 40 years. If you are part of a married couple, use the life expectancy for the younger partner and/or the person with the longest life expectancy. You can find life expectancy calculators online that incorporate personal health and family longevity characteristics.

Your portfolio’s asset allocation is also a key input. Somewhat counterintuitively, given that stocks typically outperform bonds over long time frames, the highest safe withdrawal rates generally don’t correspond with the highest equity weightings. The most conservative spending systems—the ones that target cash flow consistency like our base case—favor light equity weightings, because bonds provide more consistency despite their weaker long-term return potential. In our 2025 research, portfolios with equity weightings of just 20% to 40% delivered the highest safe withdrawal rate with base-case spending over a 30-year horizon.

On the other hand, the strategies that entail higher starting and lifetime income but more frequent spending changes tend to gravitate toward higher equity weightings.

Step 6: Ask yourself: Can you manage it?

Finally, it’s crucial to consider whether the withdrawal system that looks the best on paper is something you could maintain in real life. There’s a reason that “the 4% rule” caught on: It’s dead-simple to implement. Other strategies, such as the forgo inflation, actual spending, RMD, and constant percentage methods, are also quite straightforward; you wouldn’t need a certified financial planner to put them into practice. Meanwhile, other spending strategies like the two guardrails approaches and Vanguard’s ceiling/floor method would tend to be best suited to retirees who have a planner on board to assist with the calculations, especially as they age.