How Much Do You Need to Retire? The Number, With the Assumptions Shown

If you want to spend about $60,000 a year in retirement, the classic rule of thumb says you need roughly $1,500,000 saved. That figure comes from one line of arithmetic, and you can run your own spending number in the Retirement Calculator. The answer, though, is a range rather than a single figure, because its size moves with two things you get to decide: the withdrawal rate you trust, and how much of the bill Social Security covers.

Check it the other way to see why the rule holds together: 4% of $1,500,000 is exactly $60,000, the spending you started with. Multiply by 25 or divide by 0.04, you land on the same place.

Where the 4% rule actually comes from

A financial planner named William Bengen ran the numbers in 1994 in a paper called “Determining Withdrawal Rates Using Historical Data.” He asked a plain question: how much could a retiree pull from a portfolio in year one, raise that dollar amount with inflation every year after, and still not run out over a 30-year retirement, even if they had the bad luck to retire right before a crash? Testing every rolling period in US market history back to 1926, his answer for a 50% stock and 50% Treasury portfolio was about 4%, with the worst-case starting rate landing near 4.15%.

Four years later, three professors at Trinity University stress-tested the same idea across rolling 1926 to 1995 periods. A 4% inflation-adjusted withdrawal from a balanced portfolio survived 30 years in roughly 95% to 100% of the historical windows they tested. Push the rate to 5% and the success rate fell to about 83%. Push it to 6% and it dropped to around 68%. That is the trade the whole question turns on: spend more each year, and you raise the odds you outlive the money.

The rule is deliberately conservative. It was built to survive the worst starting year on record, not the average one. Bengen himself later widened the study to include more asset classes and raised his own guidance toward 4.7%, which tells you the 4% figure is a floor, not a ceiling. Most retirees in history could have safely spent more.

The withdrawal rate is the biggest lever

Here is where the single “number” splits into a range. The whole calculation is spending divided by a rate, so the rate you pick swings the target by a lot.

Morningstar re-runs this analysis every year in its State of Retirement Income research, using today’s lower bond yields and richer stock valuations instead of only the deep historical record. For a new retiree in 2026 who wants steady inflation-adjusted income from a balanced portfolio over 30 years, at a 90% success probability, Morningstar’s starting safe rate is 3.9%. That is up from 3.7% in its 2024 report, and the series has bounced around: 3.3% in 2021, 4.0% in 2023, then 3.7%, now 3.9%. The debate is live, not settled.

That small change in the rate is real money in the target:

• At 4.0%, $60,000 of spending needs $1,500,000.
• At Morningstar’s cautious 3.9%, it needs $1,538,462, about 25.6 times your spending.
• At the recent low of 3.7%, it climbs to $1,621,622, roughly 27 times.

Same lifestyle, same $60,000, and the target ranges across about $121,622 purely from which withdrawal rate you decide to trust. A lower rate is not pessimism for its own sake. A longer retirement, an early-retirement horizon, or thinner future returns all argue for pulling less, which is exactly why Morningstar’s figure sits below Bengen’s original 4%.

Social Security shrinks the number, a lot

The 4% math assumes your portfolio funds every dollar of spending. For most people it does not have to, because Social Security pays part of the bill for life and rises with inflation.

The average monthly benefit for a retired worker in 2026 is $2,071 after the 2.8% cost-of-living adjustment, which is about $24,852 a year. (A high earner who waits until full retirement age can get up to $4,152 a month in 2026. These are 2026 Social Security figures; the retirement math below does not depend on the tax-year settings inside the calculator.) That guaranteed income comes off the top of what your savings have to produce.

Run the same 25x rule on the gap instead of the whole number:

The target drops from $1,500,000 to about $878,700, a cut of roughly $621,300, once an average benefit is in the picture. Social Security does not erase the number. The average benefit near $24,852 a year will not fund a $60,000 life on its own. But it changes the answer enough that ignoring it makes the goal look far scarier than it is.

How a portfolio actually reaches the number

A seven-figure target sounds impossible until you watch compounding do the heavy lifting over a career. Take a saver who starts with $40,000 already invested and adds $1,000 a month, roughly a solid 401(k) contribution with an employer match, earning a 7% average annual return. Here is the path.

After 30 years that saver reaches about $1,544,631, right around the 4% target for $60,000 of spending. The striking part is the split: they put in $400,000 of their own money, and growth added about $1,144,631 on top. Most of the balance is compounding, not saving, which is why starting early matters more than any single year’s contribution. The curve is nearly flat for the first decade and then bends sharply upward. The reason that bend is so steep is worked through in compound interest, shown with real numbers. Change the starting balance, the monthly amount, or the return, and watch the finish line move in the Retirement Calculator.

What the number leaves out

This is an estimate for learning, not personal financial advice. A few things it leaves out, on purpose:

• Taxes. Money in a traditional 401(k) or IRA is taxed when you withdraw it, so covering $60,000 of spending may mean pulling more than $60,000 gross. Roth withdrawals are not taxed. The number here is before any tax planning.
• Sequence-of-returns risk. A crash in your first few retirement years does far more damage than the same crash later, because you are selling shares while they are down. That single risk is the main reason the safe rate sits below what portfolios average.
• The horizon and the mix. The 4% and 25x rule assumes about a 30-year retirement and a balanced portfolio of roughly 50% to 75% stocks. Retire at 45 instead of 65 and you should plan on a lower rate and a bigger number.
• Returns are not guaranteed. The 7% path above is an illustration of long-run averages, not a forecast. Real returns arrive lumpy, and a weak first decade changes the plan.

The number is a range you build

There is no official “you need this much to retire” figure, because it is derived, not published. For $60,000 of spending it is about $1,500,000 under the classic 4% rule, closer to $1,538,462 if you trust Morningstar’s more cautious 3.9%, and near $878,700 once an average Social Security check covers part of the bill. Pick your assumptions, show your work, and the number stops being a mystery.

Run your own spending, savings, and timeline in the Retirement Calculator. For the bigger picture, start at the Investing & Retirement hub, see the math behind the growth curve in compound interest, shown, and if debt is in the way of investing, read how to get out of debt first.