How Long Will My Money Last in Retirement?

Your money lasts as long as withdrawals, taxes, and unexpected costs stay inside what the portfolio and your other income can support. A modest withdrawal with Social Security covering a large share of bills can last for decades. A high fixed withdrawal that starts in a down market can run out much sooner, even from a large balance. No calculator can promise a year when the account hits zero, because markets, inflation, and your life will not match one path.

The practical question is sustainability: could this spending level survive a long life and a bad decade, or does it only work if everything goes well?

The inputs that decide longevity

• The withdrawal in year one, and whether it rises with inflation.
• Social Security, pensions, annuities, and work income.
• Taxes, which make the gross withdrawal larger than the cash you spend.
• Investment returns, fees, and the order of those returns.
• How long you and a spouse may need income. That is longevity risk: the plan ends before you do.
• Large one-time costs, such as a roof, a move, or long-term care.

Sequence-of-returns risk belongs on that list in plain language. If the market falls 20% in the first two years and you keep selling shares to spend, you lock in the loss. The same 20% fall in year 18, after years of other income, is usually less dangerous. A sustainable plan has a way to spend a little less, or to spend from cash, when the early years are poor.

An illustration, not a prediction

Take $800,000 of invested savings and $36,000 a year of Social Security. The household wants $64,000 of spending. The portfolio gap is about $28,000, or 3.5% of the balance in year one. If inflation is modest and returns are merely ordinary, that gap can be easier to carry than a $56,000 withdrawal from the same balance, which is 7%. The 7% sketch can look fine for a decade and then thin out if a bear market arrives early or if spending rises.

Starting withdrawal from $800,000	Share of the balance	What the sketch is really saying
$24,000	3%	More room for a long life or a weak market, if other income covers the rest of the bills.
$32,000	4%	The familiar research illustration. Still sensitive to early losses and a very long retirement.
$56,000	7%	May finish the portfolio well before a long life ends, unless spending falls or other income rises.

None of these rows is permission to withdraw that amount. They show why "how long" is a spending question. Our article on how much money you need starts from the same gap. The article on withdrawal order explains why the account you tap can change taxes and therefore how fast the balance falls.

Tradeoffs if the sketch looks short

You can spend less, work longer, delay Social Security if that raises a benefit you will actually receive, or keep a cash reserve so you are not forced to sell investments in a bad year. Annuities and pensions trade a lump sum for income that does not depend on the market. Each choice has a cost. Working longer is not free if the job is hard on your health. Spending less is not free if it cuts care you need.

Common mistakes

People divide the balance by annual spending and call that the number of years. That math ignores growth, but it also ignores inflation, taxes, and a market drop. Both errors are common. Another mistake is planning one average return every year. Retirement is not an average year repeated. A third is forgetting a spouse who may outlive the household's higher Social Security check.

What this means for your retirement plan

Pick a spending level you could actually live with, name the income that shows up even when markets do not, and test a worse decade near the start. If the plan only works on a smooth line, it is not a plan yet. An AI retirement planner can help you compare those scenarios, as long as you remember that software explores assumptions. It does not remove uncertainty.

Existing RetirementNeuron users can sign in and compare this scenario against their current plan. New readers can create an account and explore a retirement scenario with their own savings and retirement age.

Frequently asked questions

What withdrawal rate makes money last 30 years?

Research often studies a first-year withdrawal around 4% of the portfolio, later adjusted for inflation. That is a historical illustration, not a rule that fits every market, fee level, or lifespan. A lower rate adds margin. A higher rate needs other income or flexible spending.

Do I need a retirement withdrawal calculator?

A calculator helps when you can change one assumption at a time: retirement age, spending, Social Security, and a weak market. A single output with hidden assumptions is less useful than a few scenarios you understand.

Will my retirement savings last if I retire in a bear market?

They might, if you can trim spending or draw on cash for a while. They are at more risk if the withdrawal is fixed and large. Early losses matter more than later ones because you sell more shares to raise the same dollars.

Should I plan for my money to run out at a certain age?

Some people intentionally spend more and accept a declining balance. That is a choice, not a default. If running out of money would harm a spouse or your care in later life, build the plan for a longer horizon and revisit it.

Related reading

• How much money do I need to retire?
• Retirement withdrawal order for taxable, IRA, 401(k), and Roth accounts
• What does an AI retirement planner actually analyze?

This article is educational. It does not promise that a withdrawal rate will last a set number of years. Investment results vary, and tax rules change. A qualified professional can help you test a plan against your own accounts.