Finding Your Safe Withdrawal Rate in Retirement

The fear that drives the question

Ask a room full of new retirees what worries them most and the answer is rarely a market crash. It is the slow, quiet fear of outliving their money. A safe withdrawal rate is the planning world’s attempt to put a number on that fear. In plain terms, it is the share of your savings you can pull out in the first year of retirement, then adjust for inflation each year after, with reasonable confidence the money lasts as long as you do. The trouble is that the “safe” number gets treated like a law of physics when it is closer to a weather forecast. It depends on conditions, and the conditions are different for every household.

Where the 4 percent rule came from, and what it leaves out

The famous 4 percent rule traces back to research by the financial planner William Bengen in the 1990s, later reinforced by a study from three professors at Trinity University. Bengen looked at decades of market history and found that a retiree who withdrew 4 percent of a balanced portfolio in year one, then raised that dollar figure with inflation, would not have run dry over any 30 year stretch he tested. So a $1.5 million portfolio would support $60,000 in the first year.

More recent work has refined that figure rather than replaced it. In its annual State of Retirement Income research, Morningstar has estimated a safe starting withdrawal rate in the neighborhood of 4 percent for a balanced portfolio over a 30 year retirement, with the exact number moving year to year as bond yields and market valuations change. The takeaway is not a magic percentage. It is that a disciplined, inflation adjusted withdrawal somewhere around 4 percent is a reasonable starting point, not a guarantee.

The rule also quietly ignores two things that shape real retirements: taxes and human behavior. It says nothing about the 62 year old in good health whose parents both lived into their 90s, a person who may need the money to stretch closer to 35 years. A rule built on averages can mislead anyone whose life does not look average.

Why two retirees with the same balance can spend very differently

Picture two couples in Scottsdale, each retiring at 65 with exactly $2 million. On paper the 4 percent rule hands both of them $80,000 a year. In reality their sustainable spending can differ by tens of thousands of dollars. A few factors explain the gap.

• Longevity. If one couple has a family history of living into their 90s, their plan has to survive a longer retirement, which argues for a lower starting rate or more flexibility.
• The first few years of returns. Retiring into a down market and selling shares to fund $80,000 of spending locks in losses early, a problem planners call sequence of returns risk. The same average return in a different order can produce very different endings.
• Where the money sits. A couple with most of their savings in a pre-tax 401(k) owes ordinary income tax on every dollar they withdraw. A couple with a healthy Roth balance can pull tax free income and keep their taxable income, and their Medicare premiums, in check.
• Guaranteed income. Social Security, which rose 2.8 percent for 2026, plus any pension, covers part of the budget. If those sources fund $50,000 of a $90,000 lifestyle, the portfolio only has to produce $40,000, and the withdrawal math gets far easier.

Taxes quietly decide how long the money lasts

Most withdrawal-rate conversations skip the one factor that often matters most: taxes. The gross amount you withdraw is not the amount that lands in your checking account. Pull $80,000 from a traditional IRA and a chunk goes to the IRS before you spend a dollar. Pull the same $80,000 from a Roth and, in most cases, all of it is yours.

The order you tap accounts matters just as much as the total. A common approach spends taxable brokerage money first, then tax-deferred accounts, then Roth. But blindly following that script can backfire. Filling up the lower tax brackets with strategic Roth conversions in the early, lower-income years of retirement, often the window between leaving work and starting required minimum distributions, can shrink the tax bill for decades. For 2026 the standard deduction for a married couple filing jointly is roughly $32,200, and taxpayers 65 and older get an extra senior deduction of $6,000 per person through 2028, which widens the room to convert at low rates.

There is a second reason to watch taxable income closely: Medicare. Part B premiums start around $203 a month per person in 2026 and climb in tiers once income crosses certain thresholds, a surcharge known as IRMAA. A poorly timed IRA withdrawal or capital gain can push a couple into a higher tier and add thousands to their annual health costs. For a fuller look at how to keep more of every dollar invested, see Tax-Efficient Investing 101.

A withdrawal plan that changes as you age

Spending in retirement is not a flat line. Morningstar’s head of retirement research, David Blanchett, documented a pattern often called the retirement spending smile: higher spending in the active early years, a dip in the middle as travel slows, and a rise late in life as health costs climb. A withdrawal plan should bend with that curve instead of locking in one number forever.

Consider a couple who retire at 65 with $2.5 million. In their late 60s, while they are healthy and traveling, they might draw closer to 5 percent and use the low-income years to convert part of their IRA to a Roth. In their 70s, with required distributions beginning and travel easing, they settle into something near 4 percent. In their 80s, the plan leans conservative again, prioritizing the certainty that the money, and a cushion for health care, will be there. No single percentage describes that journey. A range, revisited every year, does.

Flexibility is the quiet superpower here. A retiree willing to trim spending by 5 or 10 percent in a bad market year, skipping the big trip when the portfolio is down, can often start at a higher rate than someone whose budget is rigid. Guardrails, where you set an upper and lower spending boundary and adjust when you hit them, turn a static rule into a living plan.

The research behind these numbers

• William P. Bengen, “Determining Withdrawal Rates Using Historical Data,” Journal of Financial Planning (1994).
• Cooley, Hubbard, and Walz, “Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable” (the Trinity Study), 1998.
• Morningstar, “The State of Retirement Income,” annual research on sustainable starting withdrawal rates.
• David Blanchett, “Estimating the True Cost of Retirement,” Morningstar, on the retirement spending smile.
• Social Security Administration, 2026 cost-of-living adjustment of 2.8 percent.

Why fee-only works for a question like this

Notice what the right answer to “how much can I spend” actually requires: coordinating withdrawals across account types, timing Roth conversions, watching Medicare thresholds, and adjusting as markets move. None of that is a product. None of it earns anyone a commission. That is exactly why the way your advisor is paid matters.

There is no universal safe withdrawal rate. The honest answer is that it depends, and the value of good advice is in working through what it depends on for you. Start with a realistic horizon, account for taxes, build in flexibility, and revisit the plan every year. Do that, and the fear of running out starts to loosen its grip.