Income Planning · 7 min read

Retirement Income and Withdrawal Rates: What the Research Actually Says

How much can we safely withdraw from a portfolio without running out of money? That question sits at the center of every retirement plan, and the answer has become more nuanced — and more useful — than the shorthand "4% rule" many households still rely on. Updated research, elevated bond yields, and hard lessons from early-2022 and early-2026 market volatility have sharpened our thinking across three practical frameworks: dynamic withdrawal rate guidance, income bucketing, and bond ladders. Each addresses the same core problem from a different angle.

The Safe Withdrawal Rate Debate: Where Research Stands in 2026

William Bengen introduced the 4% rule in 1994, derived from historical U.S. market data back to 1926. His finding: a retiree who withdrew 4% of their initial portfolio in year one — then adjusted that dollar amount for inflation annually — would have survived every 30-year historical period without depleting their portfolio. That finding still holds in his updated framework.

In August 2025, Bengen published revised research incorporating small-cap equities and additional asset classes, raising his "Safemax" estimate to 4.7% for the worst historical scenarios — and noting the long-run historical average Safemax across all starting periods was approximately 7.1%. (Advisor Perspectives, August 2025)

Morningstar's approach is deliberately more conservative and forward-looking. Their December 2025 research sets the safe starting withdrawal rate for 2026 retirees at 3.9% — up from 3.7% a year earlier — targeting a 90% probability of portfolio survival over 30 years, for a portfolio holding 30%–50% equities. (Morningstar, December 2025; FA Magazine)

The practical read: 4% remains a defensible starting point for a well-diversified portfolio with a 30-year horizon. Households willing to flex spending modestly in response to market conditions — a strategy called "guardrails" — may be able to start closer to 4.7–5.7% without materially increasing depletion risk.

What "safe" actually means in this context:

• Survival probability, not certainty — even a 90% success rate implies one failure scenario in ten
• Based on a fixed 30-year horizon; early retirees in their 50s may need a 35–40-year plan
• Assumes a diversified portfolio; cash-heavy or overly conservative allocations can underperform the historical models

Sequence-of-Returns Risk: The First Years Are the Most Dangerous

Two retirees can earn identical average returns over 30 years and end up with dramatically different outcomes — solely because of the order in which those returns arrived.

A portfolio hit by large losses in years one through five of retirement, while withdrawals are ongoing, suffers a compounding disadvantage that later recoveries cannot fully repair. Research quantifies the asymmetry: if a portfolio dropped at least 15% in the first year of retirement while the retiree withdrew 3.3% of the balance, the odds of depleting the portfolio within 30 years increased sixfold versus a retiree with a positive first-year return, according to Morningstar research cited in March 2025 CNBC coverage. (CNBC, March 2025)

The mechanism is straightforward: early losses force more shares to be sold at lower prices to fund the same withdrawal. The shares sold are gone permanently — they cannot participate in the subsequent recovery. Studies suggest the first ten years of retirement account for roughly 77% of the ultimate portfolio outcome.

This is why the withdrawal rate debate and the sequence-of-returns problem are inseparable. The 4% rule was derived from worst-case historical scenarios that often involved poor early returns (1966 and 1973 retirement cohorts, for example). Managing sequence risk directly — rather than only optimizing the withdrawal percentage — is at least as important.

The Bucket Approach: Building a Spending Buffer

The bucket strategy addresses sequence risk structurally by separating assets into pools with different time horizons and risk profiles, so that short-term spending needs never depend on selling equities in a down market.

A simplified three-bucket structure:

The key insight: when markets fall 20%, a retiree with three years of expenses in Bucket 1 has no reason to sell equities. They draw from cash while waiting for recovery. A retiree without that buffer may be forced to sell — locking in losses permanently.

The bucket approach is not magic. It requires regular rebalancing discipline: refilling Bucket 1 from Bucket 2 gains, and refilling Bucket 2 from Bucket 3 gains — not the reverse. Done correctly, it converts a behavioral problem (panic selling in a down market) into a procedural one.

Bond Ladders: Predictable Income in an Elevated-Yield Environment

A bond ladder — a portfolio of individual bonds or Treasuries maturing at staggered intervals — can serve as the fixed-income anchor across Buckets 1 and 2. Its primary advantage over bond funds: known cash flows on a predetermined schedule, regardless of interim price volatility.

As of mid-2026, the yield environment makes ladders more attractive than they have been in over a decade:

• 5-year Treasuries: approximately 4.2%
• 10-year Treasuries: approximately 4.5%
• 30-year Treasuries: approximately 5.0%
• 10-year TIPS real yield: approximately 2.1% (above the CPI rate)

(WealthStack Bond Ladder Guide, 2026; RetireHub, May 2026)

A practical ladder structure for a retiree needing $60,000 per year in non-Social Security income might hold individual Treasuries maturing in years one through ten — $60,000 face value per rung. Each year, a maturing rung funds that year's expenses; proceeds from Bucket 3 growth restock the far end of the ladder when equity markets are favorable.

TIPS deserve consideration for the inflation-sensitive portion. A blend of 20–30% TIPS within a nominal Treasury ladder provides a direct hedge against purchasing-power erosion — Bengen himself cited inflation as the primary long-run threat to retirement income in September 2025 commentary. (CNBC, September 2025)

Putting It Together: A Framework, Not a Formula

No single withdrawal rate, no single strategy, produces a guaranteed outcome. What the research consistently supports:

• Start between 3.9% and 4.7% of the initial portfolio, depending on equity allocation, time horizon, and willingness to flex spending
• Reserve 2–3 years of expenses in liquid, low-risk assets to eliminate forced equity selling in early retirement
• Build a bond ladder with the fixed-income allocation to match predictable income to predictable expenses
• Monitor and adjust — guardrail-based strategies (raise spending when portfolios grow materially above projections; cut modestly when they fall below) meaningfully extend sustainable withdrawal rates
• Delay Social Security where feasible — Morningstar's research shows this alone can allow starting withdrawal rates closer to 5.7% for those who use it in combination with flexible spending

The households most at risk are those entering retirement with no spending buffer, a rigid withdrawal plan, and no mechanism for adjustment. The households best positioned are those who have converted the retirement income question from a single number into a framework that responds to what markets and life actually deliver.

Frequently Asked Questions

Q: Is the 4% rule still valid in 2026?

It remains a defensible starting point for many retirees, though current research narrows or widens the range depending on assumptions. Morningstar's 2026 research sets 3.9% as a conservative, 90%-confidence starting rate for a balanced portfolio; William Bengen's updated 2025 work puts the worst-case floor at 4.7% when additional asset classes are included. For a 30-year horizon with a 50/50 equity-bond portfolio, 4% sits within the range most major research supports.

Q: What is sequence-of-returns risk, and why does it matter most early in retirement?

Sequence-of-returns risk is the danger that large portfolio losses early in retirement — when withdrawals are ongoing — permanently impair the portfolio's ability to recover. Shares sold during a downturn to fund expenses cannot participate in the rebound. The first decade of retirement has an outsized influence on the final outcome: early losses combined with ongoing withdrawals can increase portfolio depletion odds dramatically compared to the same average return experienced in a different order.

Q: How does the bucket approach protect against market downturns?

By holding 2–3 years of living expenses in short-term, low-risk assets (Bucket 1), a retiree has no immediate need to sell equities when markets decline. This removes the behavioral and mechanical pressure to liquidate at low prices, giving the growth portion of the portfolio time to recover before being tapped.

Q: Are bond ladders worth building in the current rate environment?

The current yield environment — with 10-year Treasuries near 4.5% and 30-year yields near 5% as of mid-2026 — makes individual bond ladders more attractive than they have been in over a decade. Locking in predictable cash flows at elevated rates provides income certainty that bond funds cannot replicate. TIPS ladders or blended ladders add inflation protection on top.

Q: How should a retiree think about adjusting withdrawals over time?

The research increasingly supports flexible or "guardrail" strategies over rigid fixed withdrawals. Raise spending modestly when the portfolio grows meaningfully above projections; trim modestly when it falls below. This flexibility — even if adjustments are small — can increase sustainable starting withdrawal rates by 0.5–1.5 percentage points compared to a fully rigid approach, without materially increasing the risk of depletion.

The views and opinions expressed here are those of The Financial Sciences Company as of the publish date and are provided for informational and educational purposes only. They are not personalized investment, tax, or legal advice. The Financial Sciences Company, LLC is an investment adviser registered with the State of Texas. Registration does not imply a certain level of skill or training. Additional information is available in our Form ADV at adviserinfo.sec.gov.

General educational information, current as of 2026. Not personalized investment, tax, or legal advice — figures and rules change. For guidance specific to your situation, talk to a qualified professional.