Withdrawal Strategy Calculator

The Classic 4% Rule Explained

The 4% rule is the most widely cited retirement withdrawal strategy, developed from the Trinity Study that analyzed historical market data from 1926 to 1995.

How It Works

Withdraw 4% of your total portfolio in year one of retirement. Each subsequent year, increase that dollar amount by the rate of inflation. Your withdrawal is based on your initial balance, not your current balance.

Example with $1 Million

• Year 1: Withdraw $40,000 (4% of $1,000,000)
• Year 2: Withdraw $41,200 (prior year + 3% inflation)
• Year 3: Withdraw $42,436 (prior year + 3% inflation)
• Year 10: Withdraw $52,191 (still 4% rule, adjusted for inflation)

The 4% Rule's Track Record

Historical analysis shows the 4% rule would have succeeded in roughly 95% of all 30-year periods since 1926. However, critics note that this analysis used US-only data during the most successful stock market in history. Future returns may be lower.

Who Should Use It

The 4% rule is best for retirees who value income stability above all else and plan for a 30-year retirement. If you want the same predictable spending every year regardless of market conditions, this is the simplest approach.

Read our full analysis of whether the 4% rule is still safe.

Spend More Early Strategy

Research shows retirees naturally spend less as they age. The Spend More Early strategy aligns your withdrawals with this reality.

How It Works

Start with a higher withdrawal rate in your "go-go years" (65-75) when you're most active, then gradually reduce spending through your "slow-go years" (75-85) and "no-go years" (85+).

Example with $1 Million

• Ages 65-75: Withdraw 5.5% ($55,000/yr) for travel, hobbies, activities
• Ages 75-85: Withdraw 4.5% ($45,000/yr) as activity naturally slows
• Ages 85+: Withdraw 3.5% ($35,000/yr) for basic expenses plus healthcare

The Research Behind It

David Blanchett's research on the "retirement spending smile" shows that real (inflation-adjusted) spending declines about 1-2% per year in retirement for most retirees, with a late-life uptick due to healthcare costs. The Spend More Early strategy works with this natural pattern rather than against it.

Who Should Use It

This strategy works well for retirees with big plans for early retirement, including travel, hobbies, and experiences they want to enjoy while healthy. It requires accepting lower guaranteed income in later years.

Market-Based Withdrawal (Variable Percentage)

The simplest dynamic strategy: withdraw a fixed percentage of whatever your portfolio is worth each year.

How It Works

Choose a withdrawal percentage (typically 4-5%) and apply it to your current portfolio balance each year. Unlike the 4% rule, this recalculates based on actual portfolio value.

Example with $1 Million at 4.5%

• Portfolio at $1.1M (good year): Withdraw $49,500
• Portfolio at $1.0M (average): Withdraw $45,000
• Portfolio at $800K (down year): Withdraw $36,000
• Portfolio at $1.3M (recovery): Withdraw $58,500

The Key Advantage

With this strategy, you can mathematically never run out of money. You're always taking a percentage of what exists. The trade-off is income volatility, as your withdrawal can swing significantly from year to year.

Who Should Use It

Best for retirees with flexible spending who can adjust their lifestyle based on market conditions. Works well when combined with guaranteed income sources (Social Security, pensions) that cover basic expenses, leaving portfolio withdrawals for discretionary spending.

Guyton-Klinger Guardrails Strategy

The guardrails approach combines a higher initial withdrawal rate with automatic adjustment rules that protect your portfolio.

How It Works

Start with a 5% withdrawal rate and set upper and lower guardrails at +/-20% of your target rate (4% lower, 6% upper). When your actual withdrawal rate crosses a guardrail, adjust spending by 10%.

Example with $1 Million

• Starting withdrawal: $50,000/yr (5% of $1M)
• Market drops 25%: Portfolio falls to $750K. Your $50K withdrawal is now 6.67% of portfolio, above the 6% upper guardrail. Cut spending by 10% to $45,000.
• Market recovers: Portfolio grows to $1.2M. Your $45K withdrawal is now 3.75%, below the 4% lower guardrail. Increase spending by 10% to $49,500.

The Four Guyton-Klinger Rules

• Withdrawal Rule: Calculate your withdrawal each year based on the method
• Capital Preservation Rule: If withdrawal rate exceeds upper guardrail, cut spending by 10%. This rule is suspended during the final 15 years of the planning horizon.
• Prosperity Rule: If withdrawal rate falls below lower guardrail, increase spending by 10%
• Inflation Rule: Skip inflation adjustment in years when the portfolio had a negative return

Who Should Use It

Best for retirees who want higher initial spending than the 4% rule allows but are willing to accept periodic adjustments. The guardrails provide a disciplined framework for when and how much to adjust.

Vanguard Dynamic Spending Strategy

Introduced in Vanguard's 2020 paper "From assets to income: A goals-based approach to retirement spending," this strategy is a hybrid of the percentage-of-portfolio rule (Market-Based) and the constant-dollar rule (the 4% rule). You get more spending stability than Market-Based and more responsiveness to markets than the 4% rule.

How It Works

Each year: (1) compute a target by multiplying your target withdrawal rate by your current portfolio balance; (2) take last year's spending, adjust it for inflation, and build a band around it with a ceiling 5% above and a floor 2.5% below; (3) spend the target, but never above the ceiling or below the floor. Year one is simply rate times balance.

The ceiling and floor are limits on year-over-year spending changes after inflation. They are not withdrawal-rate bands, and they are not Guyton-Klinger guardrails. RetirePlanAI defaults to a 5.0% target rate, a 5% maximum annual increase and a 2.5% maximum annual decrease; all three are adjustable. Vanguard's paper used +5% / -2.5% as its example limits and a 4% rate in its worked example, but the withdrawal rate is an input you choose, not part of the rule.

Example with $1 Million at 4% (Vanguard's worked example)

• Year 1: Withdraw $40,000 (4% of $1,000,000)
• Year 2 band: $40,000 adjusted for 3% inflation is $41,200, giving a ceiling of $43,260 (+5%) and a floor of $40,170 (-2.5%)
• Portfolio rose to $1,150,000: The 4% target is $46,000, above the ceiling, so you spend $43,260
• Portfolio fell to $950,000: The 4% target is $38,000, below the floor, so you spend $40,170
• Portfolio at $1,050,000: The 4% target is $42,000, inside the band, so you spend $42,000 as is

The Trade-Off

Because annual cuts are capped at 2.5%, spending falls more slowly than the portfolio does in a long downturn. Unlike Market-Based, this strategy can still deplete a portfolio. Run it through Monte Carlo before relying on it.

Who Should Use It

Retirees who want spending to follow the market but cannot tolerate double-digit swings, and who have some flexible spending in their budget to absorb small annual adjustments.

Create a free RetirePlanAI account to model all five strategies with your actual savings, income sources, and spending needs.