How long will my
savings last?
The most important question in retirement: will your money outlast you? Here's how withdrawal rate, taxes, inflation, and Social Security timing determine the answer.
The real question
behind the question
"How long will my savings last?" is really asking something deeper: can I afford to retire? It's the question that keeps people working an extra year, or three, or five — because the answer feels unknowable. You're trying to predict decades of spending, markets, taxes, and health with a single number. No wonder it feels impossible.
The answer isn't a single number. It depends on how much you spend, where your income comes from, what tax treatment your accounts carry, when Social Security starts, and what the market does in the first few years after you stop working. Change any one of those variables and the answer shifts by years — sometimes a decade or more.
This is why simple calculators that divide your savings by annual spending give dangerously misleading answers. They ignore taxes, which can consume 15–25% of every withdrawal from a traditional 401(k). They ignore inflation, which doubles your cost of living over 24 years. And they ignore the timing of income sources like Social Security, which can fill a massive portion of the spending gap — but only after you claim it.
What determines how long
savings last
Five factors interact to determine your portfolio's lifespan. None of them operates in isolation, and changing one can dramatically shift the impact of the others. A higher withdrawal rate is survivable with strong returns but catastrophic when combined with high inflation. Tax-efficient withdrawals matter little if your spending is unsustainable. Understanding each factor — and how they compound together — is the foundation of any serious retirement projection.
The percentage you draw each year. 4% = 25 years at 0% growth. But growth, taxes, and inflation change this dramatically. A 4% gross withdrawal from a tax-deferred account is only 3%–3.4% in actual spending power after taxes — which means your portfolio needs to work harder than the headline number suggests.
Higher returns extend portfolio life. But returns aren't constant — sequence of returns risk means the timing of gains and losses matters as much as the average. A portfolio that earns 7% average over 30 years can either triple in value or be depleted by year 22, depending on whether the bad years come first or last.
At 3% inflation, your purchasing power halves in 24 years. Your withdrawals must increase each year just to maintain the same lifestyle. A retiree spending $60,000 today will need $108,000 in 20 years to buy the same goods and services. Inflation is the silent force that turns comfortable retirements into tight ones.
Tax-deferred withdrawals lose 15–30% to federal + state tax. A $60K withdrawal may only provide $45K in spending money. Account mix matters enormously — Roth withdrawals are tax-free, taxable accounts get favorable capital gains rates, and traditional accounts are taxed as ordinary income. The order you draw from these accounts can add or subtract years from your portfolio.
SS replaces portfolio withdrawals dollar for dollar. Delaying SS from 62 to 70 increases the benefit by 76% — dramatically reducing how much your savings need to provide. Every $1,000/month from Social Security is $12,000/year your portfolio doesn't have to generate, which directly lowers your effective withdrawal rate and extends portfolio life.
How long savings last
by portfolio size
Abstract percentages become concrete at specific dollar amounts. The following estimates assume moderate growth (5–6% nominal), 3% inflation, and Social Security starting at 67. All figures are approximate — your actual timeline depends on your tax situation, account types, and state of residence.
Notice how Social Security changes the picture at every level. It's not just supplemental income — for portfolios under $1M, it's often the primary income source, with savings filling a smaller gap than most people assume.
At $3K/mo spending with $1,500/mo SS: savings bridge ~12–15 years. Social Security does the heavy lifting here, covering half of all spending. The critical move is delaying SS for maximum benefit — each year of delay between 62 and 70 permanently increases your check by 7–8%. At this portfolio size, the SS claiming decision matters more than investment returns.
At $4K/mo spending with $2K/mo SS: savings bridge ~20–25 years with moderate growth. Tax planning — Roth conversions, withdrawal sequencing — can add 3–5 years. The gap between the best and worst tax strategies at this portfolio size is roughly $80K–$120K in lifetime taxes, which translates directly into portfolio longevity.
At $5K/mo spending with $2K/mo SS: savings can last 30+ years. RMD management and bracket optimization become the primary concerns. At age 73, required minimum distributions from a $1M traditional IRA start around $37K/yr and climb — potentially pushing you into the 22% bracket even if your spending is modest. Strategic Roth conversions before RMD age are the key lever.
At $7K/mo spending: likely won't deplete. The question shifts from "will it last?" to "how much will I pay in taxes?" RMDs alone may exceed spending needs — a $2M traditional IRA generates ~$75K/yr in mandatory withdrawals at 73, climbing to $100K+ by 80. Without planning, you'll pay taxes on income you don't need. This is where Roth conversion strategy pays for itself many times over.
These scenarios illustrate a pattern: at smaller portfolios, the question is about sufficiency. At larger portfolios, the question shifts to efficiency. But at every level, a sustainable withdrawal rate and intelligent tax planning are what separate outcomes that feel comfortable from ones that feel precarious.
How to make your
savings last longer
If your projection shows your savings depleting too early, the instinct is to save more before retiring. But for people close to or already in retirement, the most powerful levers aren't about saving — they're about timing, sequencing, and tax management. These strategies can add years to your portfolio without requiring you to earn another dollar.
The single most impactful decision is when to claim Social Security. After that, the order you withdraw from your accounts and whether you do Roth conversions in the gap years between retirement and SS/RMDs can dramatically change the outcome. These aren't minor optimizations — they're structural decisions that compound over decades.
Spending flexibility is the third lever. Retirees who can reduce spending by 10–15% during market downturns have dramatically better outcomes than those locked into fixed spending. This doesn't mean living in deprivation — it means having a plan for which expenses you'd reduce temporarily if markets drop 20% in your first few years.
Every year you delay between 62 and 70 adds ~7–8% to your benefit permanently. This is the single highest-impact lever for most retirees. Claiming at 70 instead of 62 increases your monthly check by 76%. If you can bridge the gap with portfolio withdrawals, the math overwhelmingly favors delaying — especially if you expect to live past 80.
Drawing from taxable accounts first while doing Roth conversions can save 5–10 years of portfolio life. The conventional wisdom of "let tax-deferred grow" often backfires — it creates a tax time bomb when RMDs force large taxable withdrawals in your 70s. Strategic sequencing keeps you in lower brackets throughout retirement.
Staying in the 12% federal bracket vs. the 22% bracket saves ~$3K in taxes per $30K withdrawn. Over 30 years, that compounds to $90K or more in tax savings — money that stays in your portfolio generating returns instead of going to the IRS. The gap years between retirement and Social Security are the prime window for bracket management.
Reducing spending 10% during down markets dramatically improves long-term outcomes. Rigid spending + bad markets = fastest depletion. Research shows that retirees willing to cut discretionary spending during the first few years of a bear market can sustain withdrawal rates 0.5–1% higher than those with fixed spending plans.
These strategies work best in combination. Delaying Social Security while doing Roth conversions in the bridge years, drawing from taxable accounts, and maintaining spending flexibility creates a compounding advantage that can extend portfolio life by a decade or more compared to a naive approach. See our guides on withdrawal order and Roth conversion strategy for the details.
Model your
savings timeline
The only way to know if your savings will last is to model it. Not with a rule of thumb, not with a single percentage, and not by dividing your balance by your annual spending. You need a year-by-year projection that shows what actually happens to your money — accounting for taxes on each withdrawal, inflation adjustments to spending, Social Security kicking in at your chosen age, and RMDs forcing distributions whether you need them or not.
Drawdown Arc builds exactly this kind of projection. You enter your accounts, spending, and income sources, and it calculates every year from now through age 100. You see the exact year each account depletes, how your tax liability changes as income sources shift, the impact of delaying Social Security by one year or five, and whether your portfolio survives or runs out — and in which year.
The free version gives you a full year-by-year projection with federal taxes, multiple account types, and Social Security modeling. Pro adds state taxes, Monte Carlo stress testing, scenario comparison, and PDF reports — so you can test your plan against thousands of possible market outcomes and see the probability that your savings last.
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