Answer one question in under two minutes using the 4% rule: how much your savings could support each year, or how much you'd need saved for the lifestyle you want.
The 4% rule is a widely used retirement planning rule of thumb. It suggests that if you withdraw 4% of your retirement savings in your first year of retirement, then adjust that amount for inflation each year after, your savings have historically had a strong chance of lasting through a 30 year retirement. It was popularized in the 1990s by financial adviser William Bengen, who studied historical stock and bond returns to find a withdrawal rate that survived even the worst historical markets.
It's a helpful starting point, not a guarantee. The 4% figure comes from testing withdrawal rates against every rolling 30 year period in U.S. market history and finding the rate that would have survived even the single worst one, a retirement that began right before a prolonged downturn. That worst-case window is rare. In most historical periods, a retiree who spent only 4% a year finished retirement with more money than they started with, often much more, because markets over most 30 year stretches performed far better than that worst case. This is the core of the argument against treating 4% as a fixed rule: it is calibrated to a pessimistic outcome, so for most people, most of the time, it likely means under-spending and leaving money on the table rather than protecting against real risk.
It also doesn't account for your personal taxes, fees, health care costs, Social Security, or how markets actually perform during your specific retirement, and it assumes a fixed 30 year horizon and a static stock and bond portfolio. Because of this, the 4% rule is best treated as a quick, conservative starting estimate, one input into a bigger plan, not a fixed formula to follow exactly.
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