The question of how long will 1.5 m last in retirement has no single answer, because the same £1.5 million can support a household for 15 years or 40 years depending on spending, returns, and luck.
The UK's Pensions and Lifetime Savings Association estimates a "moderate" single retiree needs roughly £31,300 a year, which means £1.5 million covers decades on paper — but only if markets cooperate. The real problem is sequence risk: poor returns in your first decade can permanently shrink your pot.
This guide breaks the maths into five practical facts, with tables and tools you can use today.
Fact 1: The 4% Rule Sets Your Starting Point
The 4% rule is the simplest benchmark: withdraw 4% of your pot in year one, then adjust for inflation each year. On £1.5 million, that is £60,000 in year one. The rule comes from the Trinity Study, a widely cited US research paper on sustainable withdrawal rates.
It was built on historical US market data over 30-year periods, and later research suggests 3.3% to 3.5% may be safer for longer retirements. At 3.5%, your income drops to £52,500. The difference between 3.5% and 4% is roughly £7,500 a year — meaningful money. Use the rule as a ceiling, not a promise.
Many advisers now treat it as a starting reference and stress-test it against bad markets. How to apply this: multiply your pot by 0.035 and 0.04 to find your realistic income band, then compare it with your actual annual spending.
The 4% rule gives a simple starting benchmark for how long will 1.5 m last in retirement, before you factor in inflation. On a £1.5 million pot, that benchmark means withdrawing £60,000 in year one.
A household spending £40,000 a year draws just 2.7%, which makes how long will 1.5 m last in retirement look very comfortable over 30 years. Spend more each year, and the same pot runs dry much sooner.
Fact 2: Spending Level Decides the Timeline
Your withdrawal rate matters more than your investment returns in most scenarios. A household spending £40,000 a year from £1.5 million is drawing 2.7% — historically very safe over 30+ years. Spending £75,000 is 5%, which is aggressive and may deplete the pot within 20 to 25 years in poor markets.
The table below shows rough duration estimates under different spending levels, assuming a balanced portfolio and moderate inflation.
| Annual spending | Withdrawal rate | Rough duration | Action to take |
|---|---|---|---|
| £40,000 | 2.7% | 35+ years | Consider gifting surplus early |
| £52,500 | 3.5% | 30+ years | Stress-test with a planner |
| £60,000 | 4.0% | ~25–30 years | Build a cash buffer |
| £75,000 | 5.0% | ~20–25 years | Cut or add guaranteed income |
| £90,000 | 6.0% | ~15–20 years | High depletion risk |
These are estimates, not guarantees. Returns, fees, and inflation move the outcome considerably. How to apply this: write down your real annual spending from the last 12 months of bank statements, then find your withdrawal rate on the table.
Inflation is the silent threat that shapes how long will 1.5 m last in retirement, quietly shrinking what each pound buys. At 3% a year, £60,000 of purchasing power falls to about £44,000 in real terms after a decade.
Fees and tax mean your headline pot is not your spendable pot, which changes how long will 1.5 m last in retirement. Platform fees alone can cost £4,500 to £12,000 a year and shorten your money's life by years.
Fact 3: Sequence Risk Can Shorten Your Money's Life
Sequence-of-returns risk is the danger that a market crash early in retirement locks in losses you never recover from. Two retirees with identical average returns can end with very different outcomes depending on the order of those returns. Research from Morningstar and others consistently shows that the first decade of withdrawals carries outsized weight.
One practical defence is a cash buffer: holding two to three years of spending in cash or short-dated bonds lets you avoid selling equities in a downturn. Another is flexibility — trimming spending by 10% in bad years can add years to a portfolio.
The answer to how long will 1.5 m last in retirement therefore depends heavily on timing, not just averages. How to apply this: set aside two years of essential spending in cash before you retire, and review it annually.
Fact 4: Inflation Quietly Erodes Your Pot
Inflation is the silent threat to any retirement plan. At 3% annual inflation, £60,000 of purchasing power falls to about £44,000 in real terms after 10 years. Over 25 years it drops to roughly £28,600. That means a flat withdrawal loses ground even if your pot survives.
The Bank of England's inflation calculator lets you model this yourself with official data. Equities and inflation-linked gilts offer some protection, but nothing is perfect. Many retirees underestimate this because early retirement years often feel comfortable.
The risk builds slowly and bites later. How to apply this: run your income figure through an inflation calculator at 3% for 20 years and check whether the result still covers your essentials.
At 3% annual inflation, £60,000 of purchasing power falls to about £44,000 in real terms after 10 years, which shows how long will 1.5 m last in retirement depends on inflation.
Over 25 years that same £60,000 drops to roughly £28,600, so how long will 1.5 m last in retirement hinges on real returns.
Fact 5: Tax, Fees, and State Pension Change the Maths
Your headline pot is not your spendable pot. Platform fees of 0.3% to 0.8% a year on £1.5 million cost £4,500 to £12,000 annually — enough to shorten your money's life by years. Tax treatment matters too: UK pension withdrawals are taxed as income, while ISAs are tax-free.
The UK State Pension also reduces how much you need from your own savings; the full new State Pension is currently around £11,500 a year, though you should check your forecast on the government's official service.
Combine these factors and the same £1.5 million can behave very differently between two households. How to apply this: use a fee comparison tool to check your platform's all-in cost, and request a State Pension forecast before setting your withdrawal rate.
Platform fees of 0.3% to 0.8% a year on £1.5 million cost £4,500 to £12,000 annually, enough to shorten how long will 1.5 m last in retirement by years.
Tax treatment matters too, so how long will 1.5 m last in retirement depends on your headline pot being spendable after fees and tax.
Frequently Asked Questions About how long will 1.5 m last in retirement
What if I retire at 55 instead of 65?
Retiring a decade earlier stretches the same pot across more years and removes a decade of contributions. A 40-year horizon typically calls for a lower withdrawal rate, often nearer 3% to 3.3%, so £1.5 million might support £45,000 to £50,000 a year. Many early retirees bridge the gap with ISAs before pensions become accessible.
Model how long will 1.5 m last in retirement over 40 years, not 30.
Does a £1.5 million pot include my home?
Usually not. Most withdrawal-rate research assumes investable assets only. If your home is worth £500,000 and you plan to downsize at 75, that equity can extend your money by several years. But housing is illiquid and prices can fall. Treat property as a backstop, not core income, when judging how long will 1.5 m last in retirement.
How do I handle a market crash in year one?
Avoid panic-selling. Draw from your cash buffer first, and pause inflation increases on withdrawals for a year. Historically, portfolios that survived the worst early-retirement crashes did so because owners cut spending modestly and waited for recovery. Revisit your plan with a regulated adviser.
A single bad year rarely decides how long will 1.5 m last in retirement — your response does.
Is £1.5 million enough for a couple?
It depends on combined spending. A couple spending £55,000 a year is drawing 3.7%, which is workable over 30 years but tight over 40. Two State Pensions add meaningful guaranteed income. Couples also face the risk that one partner lives much longer. Plan for the survivor's spending, not the average, when estimating how long will 1.5 m last in retirement.
What tools can help me model this properly?
Use a dedicated retirement modeller rather than a simple spreadsheet. Vanguard publishes free retirement income research and calculators, and Morningstar offers withdrawal-rate analysis. For UK-specific planning, the government's GOV.UK pages confirm your State Pension age and forecast. Run at least three scenarios — good, average, and poor markets — to see how long will 1.5 m last in retirement.
Conclusion
The honest answer is that £1.5 million is a strong position, but its lifespan depends on decisions you control.
- Your withdrawal rate matters more than your returns — aim for 3.5% to 4% as a ceiling.
- Hold two to three years of spending in cash to survive early market shocks.
- Account for inflation, fees, and tax before you trust any projection.
- Use your State Pension and any property equity as backstops, not core income.
Start today by calculating your real annual spending and your withdrawal rate. Then stress-test how long will 1.5 m last in retirement with a proper modelling tool before you set your first withdrawal.
