The 95% Rule and 1/N: Two Underrated Withdrawal Strategies

Most retirement withdrawal conversations revolve around the same handful of strategies: the 4% rule, Guyton-Klinger guardrails, and maybe Variable Percentage Withdrawal. These are solid approaches, but they are not the only options. Two lesser-known strategies deserve far more attention than they get: the 95% Rule and 1/N.

Each solves a very specific problem. The 95% Rule gives you the market-responsiveness of a percentage-of-portfolio approach while protecting you from gut-wrenching spending cuts. 1/N takes the opposite philosophy entirely — it mathematically guarantees your portfolio lasts exactly as long as you need it to, spending every last dollar on schedule.

Let's dig into how each one works, who they're built for, and how they stack up against the strategies you already know.

The 95% Rule: A Spending Floor for Flexible Withdrawals

The core idea behind the 95% Rule is simple. Each year, you calculate your withdrawal as a percentage of your current portfolio — just like a standard percent-of-portfolio approach. But before you finalize the number, you apply two constraints:

• Floor (95%): Your withdrawal this year can never be less than 95% of what you withdrew last year (in real, inflation-adjusted terms). If markets crash and 4% of your portfolio would only give you $32,000 when you spent $40,000 last year, you withdraw $38,000 instead — 95% of last year's spending.
• Ceiling (110%): Your withdrawal this year can never exceed 110% of what you withdrew last year. If a bull market means 4% of your portfolio would give you $52,000 when you spent $40,000 last year, you cap it at $44,000. This prevents lifestyle inflation from running away during good times.

The effect is a spending stream that follows your portfolio's trajectory over time but smooths out the year-to-year noise dramatically. You still respond to sustained market movements — spending rises in long bull runs and falls during prolonged downturns — but the maximum annual cut is only 5%. Compare that to a pure percent-of-portfolio approach where a 30% market crash instantly translates to a 30% spending cut.

Why the 5% Floor Matters More Than You Think

A 5% spending cut in a single year is manageable for most households. You skip one vacation, eat out less, defer a home project. A 30% cut — which is what a pure percentage approach demands after a bad year — means fundamentally restructuring your life. You might need to move, cancel insurance, or dip into emergency reserves.

The 95% Rule says: you will eventually get to the lower spending level if markets stay depressed, but you'll get there gradually over several years, not all at once. That gradual adjustment gives you time to plan and adapt rather than scramble.

Meanwhile, the 10% ceiling on increases is equally important. When markets surge, the temptation is to ratchet up spending immediately. But bull markets end, and if you've already locked in a higher lifestyle, the next downturn hits harder. Capping increases builds a larger portfolio buffer for the inevitable correction.

95% Rule vs. Pure Percent of Portfolio

The chart below compares annual spending for both strategies over a 30-year retirement starting with a $1,000,000 portfolio at a 4% withdrawal rate. Notice how the 95% Rule produces a much smoother spending path — especially during the early downturn years where the pure percentage approach drops sharply.

The percent-of-portfolio line swings wildly — from $40K down to $30K and back up to $52K. The 95% Rule line stays in a much narrower band. Over 30 years, the 95% Rule retiree never had to absorb a single-year cut larger than 5%, while the percent-of-portfolio retiree faced several years of 10%+ swings.

Who Should Use the 95% Rule

The 95% Rule is ideal for retirees who want their spending to track market reality but who cannot stomach large year-to-year cuts. If you have fixed obligations — a mortgage, insurance premiums, property taxes — that make sudden deep cuts impractical, this strategy gives you the flexibility of market-responsive withdrawals with a built-in safety net.

It also works well as a psychological tool. One of the biggest risks in retirement is panicking during a downturn and either overspending from fear or underspending from excessive caution. The 95% Rule gives you a clear, mechanical rule to follow, which removes emotion from the equation.

1/N: The Depletion Strategy

If the 95% Rule is about smoothing spending, 1/N is about something entirely different: spending it all. The premise is almost absurdly simple. If you have 30 years of retirement, you withdraw 1/30th of your portfolio in year one. In year two, you withdraw 1/29th of what remains. In year three, 1/28th. And so on, until year 30, when you withdraw 1/1 — everything that's left.

This is a depletion strategy. It does not aim to preserve capital. It does not target a legacy. It mathematically guarantees your money lasts exactly N years — not one year more, not one year less. When the clock runs out, your portfolio balance is exactly zero.

How Spending Evolves

The counterintuitive property of 1/N is that spending tends to increase over time. Why? Because the denominator shrinks faster than the portfolio (assuming any positive average return). In year 1 you take 1/30th (3.3%). In year 15 you take 1/16th (6.25%). In year 25 you take 1/6th (16.7%). Even if the portfolio has declined from its peak, you're taking a much larger slice of what remains.

This rising spending profile actually matches a common real-world pattern. Many retirees spend more in their later years on healthcare, in-home assistance, and other age-related expenses. 1/N naturally allocates more spending to later years when you may need it most.

1/N vs. Flat SWR Spending Paths

The chart below compares spending for 1/N against a standard flat 4% safe withdrawal rate over 30 years, both starting with a $1,000,000 portfolio. The 1/N strategy starts lower but rises steadily as the remaining time horizon shrinks.

The 1/N retiree starts by spending about $33K — noticeably less than the $40K flat withdrawal. But by year 10 they've caught up, and by year 20 they're spending over $60K. In the final years, spending accelerates dramatically as the remaining time horizon collapses.

The total amount spent over 30 years is typically higher with 1/N than with a flat SWR, because you're withdrawing every dollar rather than trying to leave a residual balance. The trade-off is clear: more lifetime spending in exchange for zero legacy.

No Constraints Apply

Unlike other strategies, 1/N does not use minimum or maximum spending constraints. There is no floor and no ceiling. The withdrawal amount is purely mathematical — divide the portfolio by years remaining. If markets crash, your next year's withdrawal drops proportionally. If markets soar, spending rises immediately.

This makes 1/N the most volatile of all withdrawal strategies in terms of year-to-year spending changes. But it also makes it the most efficient — every dollar gets spent, and the portfolio duration is guaranteed.

Who Should Use 1/N

The 1/N strategy is built for people who have no legacy goal and want to maximize lifetime spending. If you have separate estate plans (life insurance, a trust, real estate) and your investment portfolio is purely for your own retirement spending, 1/N ensures you extract every dollar from it.

It also works well for retirees with guaranteed income floors — Social Security, pensions, or annuities — that cover essential expenses. If your base needs are met regardless, the volatility of 1/N withdrawals from your portfolio is just volatility in discretionary spending, which is much easier to absorb.

How They Compare: The Full Picture

Now let's put the 95% Rule and 1/N side by side with two familiar benchmarks — a flat 4% SWR and a pure percent-of-portfolio approach. The chart below compares four key metrics across all four strategies, based on a $1,000,000 portfolio over 30 years with a 70/30 stock/bond allocation.

Several things stand out:

• Success rate: Both 1/N and percent-of-portfolio have 100% success rates by design — they can never fully deplete because they always take a fraction of what remains (or in 1/N's case, deplete to exactly zero on schedule). The 95% Rule scores higher than the flat SWR because its floor mechanism slows spending during downturns.
• Spending volatility: The flat SWR has zero volatility — same dollar amount every year. The 95% Rule keeps volatility low at around 6%. Pure percent-of-portfolio and 1/N are the most volatile because they respond directly to market movements without dampening.
• Median spending: 1/N produces the highest median spending over 30 years because it depletes the entire portfolio. The 95% Rule edges out the flat SWR because it captures some upside from good market years.
• Legacy: The flat SWR leaves the largest median legacy because its rigid spending often undershoots what the portfolio could support. 1/N leaves nothing by design. The 95% Rule falls in the middle — responsive spending means more gets used during your lifetime.

Choosing Between Them

These two strategies are not competitors — they solve fundamentally different problems. Here is how to think about which one fits your situation:

Choose the 95% Rule if you want market-responsive spending with a strong safety net. You have fixed expenses that make large spending cuts impractical. You value predictability and emotional peace of mind over mathematical optimization. You want to leave some legacy but also enjoy strong markets when they come.

Choose 1/N if you want to maximize lifetime spending and have no legacy goal. You have a guaranteed income floor (Social Security, pension) covering essentials. You are comfortable with volatile discretionary spending. You want the simplicity of pure math — just divide and withdraw.

And of course, neither strategy exists in isolation. You can explore how all withdrawal strategies compare visually in our withdrawal strategies visual guide, or dive deeper into guardrail approaches with the Guyton-Klinger breakdown and Variable Percentage Withdrawal analysis. For early retirees with longer time horizons, see the best withdrawal strategy for early retirement.

Test It Yourself

The best way to understand how these strategies actually play out is to model them with your own numbers. The FIREwiz retirement simulator lets you select the 95% Rule or 1/N as your withdrawal strategy and run thousands of Monte Carlo or historical simulations with your portfolio size, asset allocation, and time horizon. You can compare the spending paths, success rates, and risk metrics side by side.

Track your actual portfolio value over time with a free tool like Empower so you always know where you stand when it's time to calculate your next year's withdrawal. And if you're using the 95% Rule, knowing your precise spending from the prior year is essential — a budgeting tool like Monarch Money makes that easy to track down to the dollar.

Pick a strategy, plug in your numbers, and see how your retirement holds up across every market scenario in history. Try the retirement simulator now.