How much do you need to retire?
The standard answer is twenty-five times your desired annual income. It is a useful anchor, it comes from a specific piece of research with specific assumptions, and it is quoted far more confidently than the evidence supports.
Where the number comes from
The 25x figure is the inverse of the 4% rule: if you withdraw 4% of your portfolio in the first year of retirement and adjust that amount for inflation each year afterwards, historical US data suggested the portfolio would survive a 30-year retirement.
So a $50,000 annual income implies $1.25 million. A $30,000 income implies $750,000. The arithmetic is trivial; the assumptions underneath it are not.
The step most calculators skip
That $1.25 million is in today's money. If you retire in thirty years, you need the equivalent purchasing power at that date, not the nominal figure.
At 2.5% inflation, prices roughly double every 28 years. A target of $1.25 million today becomes closer to $2.6 million in thirty years. This single adjustment is why honest retirement targets look alarming, and why calculators that omit it are quietly flattering you.
The retirement calculator applies it explicitly, which is why its target is usually larger than figures you may have seen elsewhere.
Why 4% deserves scepticism
The rule came from analysis of US market history over rolling 30-year periods. Every part of that sentence is a constraint.
US markets were among the twentieth century's strongest performers. Applying their record to other countries is survivorship bias in action.
Thirty years assumes retirement at 65 and death at 95. Retire at 55 and you may need to fund forty years, which lowers the safe rate.
The original study charged no fees. A 1% advisory fee comes directly out of the safe withdrawal rate.
Later research has argued for figures from below 3% to above 5% depending on assumptions. Treat 4% as a reasonable central estimate, not a settled fact — and if your plan only works at 5%, it is fragile.
Sequence risk: the danger that is not average returns
Two retirees can experience identical average returns and end in completely different positions depending on when the bad years arrive.
A market fall in the first years of retirement is far more damaging than the same fall later, because withdrawals are being taken from a depleted portfolio, permanently removing shares that would have participated in the recovery. This is sequence-of-returns risk, and it is the main reason simple average-return projections overstate safety.
The common mitigations are holding one to three years of expenses in cash to avoid selling into a downturn, keeping some flexibility to reduce spending in bad years, and shifting toward more conservative holdings as retirement approaches.
What the target does not include
State pensions, employer pensions, and any expected inheritance or property sale all reduce the pot you need from your own savings — often substantially. A state pension covering $15,000 a year reduces the income your portfolio must generate, cutting the target by $375,000 at a 4% rate.
Working against that, retirement spending is rarely flat. It tends to be higher in the early active years, lower in the middle, and higher again late in life when healthcare dominates. A single constant income figure is a simplification, and healthcare is the item most often underestimated.
Frequently asked questions
How much do I need to retire?
A common starting point is 25 times your desired annual income, which is the inverse of a 4% withdrawal rate. A $50,000 income implies $1.25 million in today's money, which then needs inflating to your actual retirement date - at 2.5% inflation over 30 years, closer to $2.6 million.
Is the 4% rule still reliable?
It is a reasonable anchor rather than a guarantee. It came from US historical data over 30-year retirements with no fees. Longer retirements, advisory fees and non-US markets all push the safe figure lower, and subsequent research spans from below 3% to above 5%.
What is sequence of returns risk?
It is the risk that poor market returns arrive early in retirement. Withdrawing from an already-fallen portfolio permanently removes shares that would have participated in the recovery, so two retirees with identical average returns can end up in very different positions depending on the order those returns arrived.