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Declining Balance / Glidepath

Begin retirement with a higher withdrawal rate and systematically reduce it each year, front-loading your spending when you're most active.

How It Works​

The Declining Balance method starts with a relatively generous withdrawal rate — say 5.5% — and reduces it by a fixed amount each year until it reaches a floor rate, such as 3.5%. The result is a "glidepath" that delivers higher income early in retirement when most retirees travel, pursue hobbies, and are physically active, then tapers to a more conservative rate later in life.

This approach is grounded in the observation that real spending tends to decline with age. Research from the Bureau of Labor Statistics consistently shows that household spending drops roughly 1-2% per year in real terms after age 65, with the sharpest declines in transportation, entertainment, and discretionary categories. Rather than withdrawing a constant percentage and accumulating unspent cash, the Declining Balance method aligns your portfolio draws with this natural spending curve.

The trade-off is straightforward: higher early spending means less portfolio growth, which means lower absolute dollar withdrawals later. If you live well past your life expectancy or encounter a severe early bear market, the reduced late-life income could fall short. This method works best when paired with guaranteed income sources that cover non-negotiable expenses.

The Formula​

Year 1:

withdrawal_rate = startingRate
withdrawal = portfolio × withdrawal_rate

Year 2+:

withdrawal_rate = max(previous_rate - declineRate, floorRate)
withdrawal = portfolio × withdrawal_rate

Key parameters:

  • Starting rate: Initial withdrawal percentage (e.g., 5.5%)
  • Decline rate: Annual reduction in the withdrawal percentage (e.g., 0.1% per year)
  • Floor rate: Minimum withdrawal percentage that the rate cannot drop below (e.g., 3.5%)

Pros & Cons​

Advantages:

  • Front-loads spending to your most active retirement years
  • Matches the well-documented decline in real spending with age
  • Preserves portfolio for later decades by tapering withdrawals
  • Simple to implement — one subtraction per year

Limitations:

  • Less income later in life when healthcare costs may be rising
  • May not match your actual spending pattern if yours differs from the average
  • Requires choosing three parameters (start, decline, floor) — more complex than a single rate
  • No automatic adjustment for market performance

Example​

Starting portfolio: $1,000,000 | Starting rate: 5.5% | Decline: 0.1%/year | Floor: 3.5%

YearPortfolioRateWithdrawal
1$1,000,0005.5%$55,000
5$960,0005.1%$48,960
10$890,0004.6%$40,940
15$850,0004.1%$34,850
21+$820,0003.5%$28,700

After year 20, the rate holds at the 3.5% floor. Early-year withdrawals are nearly double the late-year withdrawals in dollar terms, reflecting the front-loaded design.

When to Use This Method​

Declining Balance works best for retirees who:

  • Plan to spend more in early retirement (travel, hobbies, home projects)
  • Have guaranteed income (Social Security, pension) that covers baseline needs later
  • Are comfortable with a predictable, gradual reduction in portfolio withdrawals
  • Want a middle ground between aggressive fixed-rate spending and conservative longevity methods

It is less suitable for retirees who expect rising expenses (such as anticipated long-term care) or who have no guaranteed income floor.

Try It Yourself

Compare Declining Balance against other strategies using your own numbers in the Scenario Builder.

References​