What a realistic withdrawal rate looks like now

The “4% rule” comes from a 1994 study by financial planner William Bengen, who tested historical U.S. market returns to find a withdrawal rate a 30-year retirement portfolio could survive. It's a useful starting heuristic, not a rule in the sense of a guarantee — it was built on one country's historical returns over one set of decades, and nothing requires the future to look like that.

A handful of things move the number for any specific retirement, and they push in different directions:

• Time horizon. A 30-year retirement supports a lower withdrawal rate than a 15-year one. Retiring earlier, or simply living longer than average, means the money has to last longer.
• Portfolio mix. Bengen's original work assumed a 50/50 stock-and-bond split. A more conservative or more aggressive mix changes both the safe withdrawal rate and how much the balance swings year to year.
• Spending flexibility. A retiree who can cut discretionary spending in a down market — skip the big trip, delay the renovation — can often sustain a higher starting rate than someone with fixed, inflexible expenses.
• Sequence-of-returns risk. Two retirees with identical average returns over 30 years can end up in very different places if one retires into a market downturn and the other doesn't. The order returns arrive in matters as much as the average.
• Other income. Social Security, a pension, or rental income reduces how much a portfolio needs to cover on its own, which changes what withdrawal rate from savings actually means for that household.

None of this produces a single correct percentage — it's why “what's a safe withdrawal rate” is really several smaller questions about a specific household's time horizon, portfolio, flexibility, and other income. That's a conversation worth having with a fiduciary advisor who can model it against your actual numbers, not a generic rule of thumb.