Retirement Planning Guide
Drawdown Strategies: How Long Will My Money Last in Retirement?
Once you stop working and start spending down the savings you spent decades building, one question matters more than almost any other: how long will my money last in retirement? The answer depends less on the size of your nest egg than on the way you withdraw from it. Two retirees with identical starting balances can reach very different outcomes simply because they chose different drawdown strategies. This guide explains the most common approaches, the trade-offs between them, and how our how long will my money last calculator helps you see the effect of each one in seconds.
Why your drawdown strategy matters
During your accumulation years, the main job is to save and invest. In retirement, that job flips: your portfolio now has to provide a reliable income while continuing to grow enough to keep up with inflation. The challenge is that investment returns are not steady. Some years the market rises, some years it falls, and the order in which those good and bad years arrive can dramatically change how long your money lasts. This is known as sequence-of-returns risk, and it is the single biggest reason a thoughtful drawdown strategy beats a random one.
Our how long will my money last calculator models a steady average return to keep the projection simple and transparent, but it still captures the core forces at play: your withdrawal amount, inflation, taxes on growth, and investment returns. By adjusting those inputs, you can compare strategies and immediately see which ones stretch your runway furthest.
The 4% rule: the classic starting point
The most widely cited drawdown strategy is the 4% rule. It suggests withdrawing 4% of your starting portfolio in the first year of retirement, then adjusting that dollar amount upward each year for inflation. The rule comes from historical research showing that, over most 30-year periods in the past century, this approach would have sustained a balanced stock-and-bond portfolio without running out of money.
The 4% rule is appealing because it is simple and conservative, but it has real limitations. It was built on historical U.S. market data that may not repeat, it assumes a roughly 30-year retirement, and it does not adapt to changing conditions. If you retire just before a long market downturn, a fixed 4% withdrawal can drain your portfolio faster than expected. Still, it remains a useful baseline, and you can test it directly in the calculator by setting your monthly withdrawal to about 4% of your balance divided by 12.
Fixed-dollar (amortization) withdrawals
A fixed-dollar strategy is exactly what our calculator models by default: you decide how much you want to spend each month, and that amount is withdrawn every year, rising with inflation. The advantage is predictability. You know your income, and you can plan around it. The disadvantage is inflexibility. If the market drops sharply in your first years of retirement, you keep withdrawing the same amount, selling more shares at lower prices, which accelerates depletion. This is why, when you ask how long will my money last, the answer is so sensitive to the withdrawal amount you choose.
Percentage-of-portfolio withdrawals
Instead of withdrawing a fixed dollar amount, some retirees withdraw a fixed percentage of the current portfolio each year, say 4% or 5%. Because the withdrawal is tied to the balance, your income naturally shrinks in bad years and grows in good ones. This protects against running out of money entirely, since you never withdraw more than the portfolio can support in a given moment. The trade-off is that your income becomes variable, which makes budgeting harder. Some retirees smooth this out by combining a percentage rule with upper and lower spending limits.
Dynamic and guardrail strategies
Dynamic strategies go a step further by adjusting withdrawals based on how the portfolio is performing. A guardrail approach, for example, sets a target withdrawal rate and then reduces spending if the portfolio drops below a certain threshold, or increases it if the portfolio grows beyond an upper limit. This adds flexibility and resilience, at the cost of more active management. For retirees comfortable with some income fluctuation, dynamic strategies often produce the most sustainable outcomes because they respond to the very market conditions that cause fixed strategies to fail.
Bucket strategies
A bucket strategy divides your savings into segments, each with a different purpose and risk level. A common setup uses three buckets: a cash bucket for near-term spending, a bond bucket for mid-term income, and an equity bucket for long-term growth. You spend from the cash bucket first, which means you are never forced to sell stocks during a downturn. As markets recover, you refill the cash bucket from the growth-oriented buckets. This approach is partly psychological, it gives retirees confidence to stay invested during rough markets, but it also provides a logical structure for sequencing withdrawals.
Tax-efficient withdrawals
Which account you withdraw from can be as important as how much you take. Many retirees hold savings across taxable accounts, tax-deferred accounts like traditional IRAs and 401(k)s, and tax-free accounts like Roth IRAs. A tax-efficient drawdown sequence typically draws from taxable accounts first, allowing tax-deferred balances to keep compounding, and reserves Roth assets for later years or for years when pulling from a traditional account would push you into a higher tax bracket. Our calculator lets you set a federal marginal tax bracket that applies only to investment growth, so you can see how taxes chip away at your returns over time.
Combining strategies
In practice, few retirees follow a single strategy to the letter. A common approach blends several ideas: start with a 4%-rule baseline, apply guardrails to cut spending in bad years, use buckets to organize near-term and long-term needs, and sequence withdrawals tax-efficiently. The goal is to balance a steady, comfortable income with enough flexibility to absorb market shocks. Use the calculator to test how each lever, lower spending, higher returns, or a different tax assumption, changes how long your money lasts, then build a strategy around the combination that fits your life.
How to use the calculator to compare strategies
Our how long will my money last calculator is designed to make these comparisons instant. Enter your current balance, age, and monthly withdrawal, then adjust the return, tax, and inflation assumptions to match the strategy you are considering. The insight cards show you how spending $500 less per month or earning 2% more annually extends your runway, giving you a concrete sense of which changes matter most. Try several combinations and watch the depletion age, the balance chart, and the monthly breakdown update in real time.
Remember that no calculator can predict the future. Real returns fluctuate, tax laws change, and personal circumstances shift. The value of this tool is not a single number, but the ability to explore scenarios quickly and understand which choices give you the best chance of making your money last. For a plan tailored to your full financial picture, speak with a qualified financial advisor.