retirement-withdrawal-calculator.com
Built by Jared Courter, a software engineer that enjoys building small web applications focused on sports and data. Most of my projects are simple tools designed to make stats, strategy, and data easier (and more fun) to explore.
Last reviewed: April 2026
Source: Trinity Study (1998)
The 4% Rule originated from the Trinity Study, a landmark 1998 paper by three finance professors at Trinity University. The study analyzed historical stock and bond returns from 1926 to 1995 and found that a retiree who withdraws 4% of their starting portfolio in year one — then adjusts that dollar amount for inflation each subsequent year — had a very high probability of not running out of money over a 30-year retirement.
The rule became the de facto standard for retirement income planning, used by financial advisors and planners as a starting-point conversation. Its main appeal is simplicity: you calculate your annual spending need, multiply by 25, and arrive at a target portfolio size. A retiree spending $60,000 per year needs $1.5 million saved.
The main criticism is rigidity. The 4% Rule does not respond to what markets actually do after you retire. If you retire into a severe early-sequence downturn — where markets fall sharply in the first few years — your portfolio can be impaired to the point that even a recovery cannot restore it. This is the sequence-of-returns risk that more adaptive strategies try to address.
The 3.5% Rule is structurally identical to the 4% Rule but uses a more conservative starting withdrawal rate. The same mechanics apply: withdraw 3.5% of your starting portfolio in year one, then increase that dollar amount by inflation each year regardless of portfolio performance.
The motivation for choosing 3.5% over 4% is straightforward: lower initial withdrawals reduce the risk of portfolio depletion, especially over longer retirements. The original Trinity Study was based on a 30-year horizon. Modern retirees who retire at 60 or 65 and live into their 90s face a 30–35 year retirement — or longer. A lower starting rate provides a meaningful buffer.
The tradeoff is reduced income. A retiree with a $1.5 million portfolio takes $52,500 per year at 3.5% versus $60,000 at 4%. Over a multi-decade retirement, that gap compounds. The 3.5% Rule is best suited for retirees with longer time horizons, higher risk aversion, or those who want a margin of safety against poor market conditions.
Dynamic Spending takes a fundamentally different approach: instead of withdrawing a fixed dollar amount adjusted for inflation, you withdraw a fixed percentage of your current portfolio value each year. If the portfolio is up, you spend more; if it's down, you spend less.
The immediate consequence is that the portfolio almost never reaches zero. If you're withdrawing 4% of whatever is left, the portfolio can only approach zero asymptotically — it can shrink dramatically, but the withdrawal shrinks with it. This makes Dynamic Spending an excellent tool for understanding sequence-of-returns risk: you can see on the chart how much income variability you'd accept in exchange for portfolio durability.
The practical downside is real: your annual income fluctuates with market returns, which makes budgeting difficult. A retiree who starts by spending $60,000 may find themselves spending $38,000 after a severe bear market — a 37% income cut. For retirees whose spending is largely fixed (mortgage, healthcare, essential costs), that kind of volatility is hard to absorb. Dynamic Spending works best as a complement to other strategies or for retirees with significant flexibility in discretionary spending.
Source: Guyton & Klinger, Journal of Financial Planning (2006)
The Guyton-Klinger framework was developed by financial planners Jonathan Guyton and William Klinger and published in the Journal of Financial Planning in 2006. It attempts to solve the core problem with the 4% Rule — rigidity — by introducing a rules-based system for adjusting withdrawals in response to portfolio performance.
The strategy starts with a higher initial withdrawal rate (commonly 5% or 5.5%) than the 4% Rule allows. Each year, you check your current withdrawal rate against two guardrails. If the rate has risen above the upper guardrail (the portfolio has shrunk relative to your spending), you cut your withdrawal by 10%. If the rate has dropped below the lower guardrail (the portfolio has grown), you raise your withdrawal by 10%.
The result is a self-correcting system: spending adjusts to protect the portfolio when markets are bad and allows you to spend more when markets are good. Research by Guyton and Klinger showed that this approach could support higher starting withdrawals than the 4% Rule while maintaining comparable sustainability over long retirements.
The key limitation is income variability. In a prolonged bear market, spending can be cut multiple times in succession. Retirees who use this strategy need a baseline of essential spending that can be covered by Social Security, pensions, or other guaranteed income — so that guardrail cuts affect only discretionary spending.
The Bond Tent addresses sequence-of-returns risk directly by adjusting asset allocation — not just spending — in the years surrounding retirement. The strategy is named for the tent-shaped bond allocation that peaks at or near the retirement date and then declines as the retiree ages.
The core insight is that the first five to ten years of retirement are the most critical. A severe market decline in that window, combined with ongoing withdrawals, can permanently impair the portfolio in a way that later recoveries cannot fix. By holding a higher bond allocation at the start of retirement, the retiree reduces exposure to this specific risk.
After the glide period ends, equity allocation shifts back upward, restoring the higher expected long-run returns that equities provide. The cost of the strategy is opportunity cost: the years spent holding elevated bonds are years you are not fully participating in equity market gains. In strong bull markets — like the extended run of the 2010s — the Bond Tent can meaningfully underperform a pure equity allocation.
The Bond Tent is often used in combination with other withdrawal strategies rather than as a standalone approach. The most common application is pairing it with a rules-based withdrawal method like Guyton-Klinger, giving you both allocation-level and spending-level protection against early-retirement downturns.
Enter your starting portfolio value, retirement age, life expectancy, and inflation rate. The calculator runs year-by-year projections for each enabled strategy under your chosen return scenario — pessimistic, base, or optimistic. Results appear immediately in the chart and summary table. All calculations happen in your browser; no data is sent to any server.
There is no single right answer — it depends on your income flexibility, risk tolerance, and retirement length. The 4% Rule is the industry benchmark and a reasonable starting point. If you have a longer time horizon or want a safety buffer, the 3.5% Rule is more conservative. If your spending is flexible, Dynamic Spending nearly eliminates depletion risk. Guyton-Klinger is worth modeling if you want a higher starting income with a structured adjustment mechanism. The Bond Tent is most relevant for retirees concerned about retiring into a bear market.
Sequence-of-returns risk is the danger that poor market returns in the early years of retirement — when withdrawals are largest relative to the portfolio — can permanently damage a portfolio even if long-run average returns are perfectly adequate. Two retirees with identical average returns can have very different outcomes depending on whether the bad years come early or late. The pessimistic scenario in this tool lets you stress-test your strategy against early-retirement downturns.
Pessimistic (4% nominal), Base (6% nominal), and Optimistic (8% nominal) are starting presets that represent a range of market environments. You can edit any of these rates directly. The simulator applies a single constant return rate for the full retirement horizon — it does not model year-to-year volatility or sequence-of-returns effects. Use the pessimistic scenario to understand how each strategy holds up in a sustained low-return environment.
No. This simulator is for educational and planning purposes only. It uses simplified assumptions — constant returns, no taxes, no Social Security income, no asset allocation changes over time (except the Bond Tent model). A qualified financial planner can model your specific situation with significantly more precision, including tax-advantaged account strategies, required minimum distributions, and Social Security optimization.
Yes — completely free to use, with no account or login required. If you find it useful, the Buy Me a Coffee button in the header is appreciated.