The 4% Rule in 2026 — Does It Still Work?

The 4% rule is the cornerstone of FIRE planning. It comes from the 1998 Trinity Study, which found that withdrawing 4% of your portfolio annually — adjusted for inflation — had survived every 30-year period in US market history. Decades later, it remains the dominant framework for retirement planning. But with higher valuations, changing interest rates, and longer retirement horizons in 2026, does it still hold?

Where the 4% Rule Comes From

Professors Cooley, Hubbard, and Walz at Trinity University analyzed historical US market returns from 1925–1995. They tested what withdrawal rate would have sustained a portfolio through every 30-year retirement window in that period. With a 50/50 stock/bond allocation, a 4% withdrawal rate had a 95%+ success rate. With 75% stocks, it was even higher.

The rule was designed for traditional retirees with 30-year horizons. FIRE practitioners have applied it to 40–60 year horizons — which is where the debate gets interesting.

The Updated Research: Still Mostly Holds

More recent research using updated data through the 2020s has been largely supportive of the 4% rule, with nuance. A 2021 update to the original Trinity Study found that 4% remained robust across historical periods. Morningstar's 2022 research suggested a slightly more conservative 3.3% for maximum safety over longer horizons. Wade Pfau, a leading retirement researcher, has suggested 3.5–4% depending on asset allocation.

The consensus: 4% is still a reasonable planning figure for a 30-year retirement. For 40–50 year retirements (common in FIRE), 3.5% or 3.25% provides a larger safety margin.

The Main Concerns in 2026

High equity valuations: When stocks are expensive relative to earnings (high CAPE ratio), expected future returns tend to be lower. High valuations in US markets in recent years have led some researchers to project lower returns for the next decade.

Longer retirements: The original study assumed 30 years. If you retire at 35, you may need your portfolio to last 60+ years. The data on 60-year withdrawal periods is thinner and less certain.

Sequence of returns risk: A market crash in the first 5 years of retirement is far more damaging than one in year 20. This "sequence risk" is the biggest practical threat to any withdrawal strategy.

Practical Takeaways for 2026 Retirement Planning

Use 4% as your baseline planning figure. If you're retiring early (under 50) and want extra safety, plan for 3.5%. If you have flexibility to reduce spending in bad market years, cut expenses temporarily, or earn small amounts of income, 4% is well-supported.

The rule is a guideline, not a guarantee — and it always was. The FIRE community has always understood this; it's why most FIRE practitioners maintain a cash buffer, keep skills marketable, and stay flexible.

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