How Much Do I Need to Retire? A Simple Framework for Pre-Retirees

A common starting point is roughly 25 times your expected annual retirement expenses, the flip side of the “4% rule,” which says you can withdraw about 4% of a portfolio each year without running out of money over a typical 30-year retirement. That’s the rule of thumb people usually land on when they ask how much they need to retire. The real number depends on your actual spending, taxes, how long you and a spouse are likely to need the money, and when you claim Social Security, all of which can move your target by hundreds of thousands of dollars in either direction.

If you’ve searched “how much do I need to retire” and gotten five different answers from five different calculators, that’s not a bug. The honest answer has more moving parts than a single multiple can capture. This framework walks through them in order.

How Much Do I Need to Retire? The Short Answer

Take your expected annual spending in retirement, subtract any guaranteed income like Social Security or a pension, and multiply what’s left by 25. That’s the 4% rule in reverse, and it’s a reasonable first estimate for someone with a fairly typical retirement length and a portfolio split between stocks and bonds.

It fits best if you’re retiring at a traditional age, expect a 25-to-30-year retirement, and can tolerate normal market ups and downs without panic-selling. It fits worst if you’re retiring early (a 35-to-40-year retirement needs a lower withdrawal rate, closer to 3.25%–3.5%, which means a bigger multiple, closer to 28x–31x than 25x), if your portfolio is heavily weighted toward bonds or cash, or if a large share of your expenses is inflexible, like a mortgage that outlasts your working years.

The 25x number is a starting point for a conversation, not a finished plan. The sections below walk through why, factor by factor, so the number you end up with is actually yours.

Start With Your Retirement Income Needs

Every version of retirement income planning starts in the same place: not the portfolio, but the spending. Before any withdrawal rate means anything, you need a real number for what a year of retirement actually costs you, because “how much do I need to retire” is really two questions disguised as one: “How much do you spend?”, and “How long does the money need to last?”

Start with what you spend now, then adjust deliberately rather than guessing:

• Fixed costs, housing, insurance, debt payments, anything that doesn’t flex with your mood. These usually don’t shrink much in retirement.
• Discretionary spending, travel, hobbies, dining out, gifts to family. This is where most retirees actually have control, and where a plan built on guesswork tends to go wrong first.
• Changes unique to retirement: no more commuting costs or payroll taxes, but likely more healthcare spending and more free time to fill, which often costs money.

A retiree spending $8,000 a month needs a very different number than one spending $15,000 a month, even if they retire the same year with the same life expectancy. Good retirement income planning gets this figure right before it goes anywhere near a withdrawal rate.

The 4% Rule and Safe Withdrawal Rates

The 4% rule comes from research published in 1994 by financial planner William Bengen, who looked at historical market returns and found that a retiree withdrawing 4% of their portfolio in year one, then adjusting that dollar amount for inflation every year after, would have survived every 30-year period in U.S. market history without running out of money.

Here’s what that looks like at different portfolio sizes:

The rule still holds up reasonably well, but it isn’t static, and the nuance matters. Bengen himself has since revised his own estimate upward, suggesting up to 4.7% may be sustainable in some market conditions. Morningstar’s most recent research points the other direction for a fixed, non-flexible withdrawal strategy, putting a more conservative safe withdrawal rate somewhere in the 3.9% range for someone retiring today, while noting that retirees willing to adjust spending in response to markets, spending a bit less after a down year, a bit more after a strong one, may sustainably support higher withdrawal rates meaningfully. The honest answer to how much you need to retire is that 4% is a well-researched starting point, not a law of physics, and where your actual number lands depends on your flexibility, your asset mix, and how long your money needs to last.

Factors That Change Your Number

The 25x rule assumes an average case: average lifespan, average tax situation, average market returns arriving in an average order. Almost nobody is exactly average, and the further you sit from that average, the more the rule of thumb needs adjusting. Here’s what actually moves the number, in the order most pre-retirees encounter it.

Taxes

A dollar in a Roth IRA and a dollar in a traditional 401(k) are not the same dollar. Withdrawals from tax-deferred accounts are taxed as ordinary income, which means your “number” needs to be larger than a pure spending calculation suggests if most of your savings sit in accounts you haven’t paid tax on yet. This is also where required minimum distributions come in, the IRS currently requires withdrawals from most tax-deferred accounts starting at age 73 (rising to 75 for anyone born in 1960 or later), whether you need the income that year or not. Tax-efficient retirement planning means deciding, well before age 73, which accounts to draw from first, and whether Roth conversions in lower-income years make sense before RMDs force the issue. Current IRS rules on required minimum distributions are worth a direct look if a meaningful share of your savings is in a traditional IRA or 401(k).

Healthcare and IRMAA

Healthcare tends to be the most underestimated line item in a retirement budget, and it has a quirk that catches people off guard: higher taxable income in retirement, including RMDs, can push you into a higher Medicare Part B and Part D premium bracket through IRMAA, the income-related monthly adjustment amount. Two retirees with the same total wealth can pay noticeably different Medicare premiums depending on how that wealth is distributed across taxable, tax-deferred, and Roth accounts. It’s one more reason the source of your income matters as much as the amount.

Social Security timing

Claiming Social Security at 62 instead of your full retirement age permanently reduces your monthly benefit; delaying past full retirement age up to 70 permanently increases it, by roughly 8% for every year you wait. That single decision can shift how much your portfolio needs to cover by tens of thousands of dollars a year, in either direction. A free benefit estimate at ssa.gov is the fastest way to see your actual numbers at different claiming ages.

Longevity

A 62-year-old retiree today has a meaningful chance of a 30-to-35-year retirement, and a married couple has good odds that at least one spouse sees 90. Planning to the average life expectancy plans to run out of money for everyone who beats it, which is close to half of all retirees by definition. This is the quiet reason many planners build retirement income plans around a 30-to-35-year horizon even for clients who retire at a traditional age, the cost of underestimating your own timeline is much higher than the cost of a slightly more conservative number.

Sequence of returns risk

Two retirees with identical average returns over 30 years can end up with wildly different outcomes depending on the order those returns arrive in. A significant market decline in the first few years of retirement, while you’re also withdrawing income, does far more damage than the same decline arriving in year twenty-five; there’s less time and less remaining balance for the recovery to work with. This is precisely why “average return” is the wrong number to plan around, and why the years immediately before and after retirement deserve more caution than the ones in the middle.

How to Calculate Your Own Retirement Number

1. Estimate your annual retirement spending, using your current spending as the starting point and adjusting for what genuinely changes: less commuting and payroll tax, more healthcare and travel.
2. Subtract guaranteed income, Social Security, a pension, or any annuity income, to find the actual gap your portfolio needs to fill. This gap, not your total spending, is the number that actually drives retirement income planning from here on.
3. Multiply that gap by roughly 25 to 27, leaning toward the higher end if you’re retiring early, holding a more conservative portfolio, or want a larger margin for sequence of returns risk.
4. Adjust for taxes, since a number built from pre-tax account balances needs to cover the tax bill those withdrawals will eventually create, and since required minimum distributions will eventually force some of that tax bill regardless of when you’d prefer to take it.
5. Stress-test it against a down market in the first five years, higher-than-expected healthcare costs, and a longer-than-average lifespan, the three things that most often turn a comfortable number into an uncomfortable one.

The retirement calculator walks through steps one and two using your own numbers rather than national averages, which is where a generic rule of thumb starts to become an actual plan.

Get a Personalized Retirement Plan

The 25x rule gets you a ballpark. A real number accounts for your actual spending, your specific tax situation, your Social Security timing, and how your portfolio is built to handle a bad market in year two instead of year twenty. None of that shows up in a generic multiple, and all of it is knowable well before you retire, not after. If you’d rather work through that with a fiduciary retirement planner near you than guess. Request an Appointment with Peak American; the first conversation is complimentary, and it comes with no obligation.

Frequently Asked Questions

Can I retire on $1 million?

At a 4% withdrawal rate, $1 million supports about $40,000 a year before tax, plus whatever Social Security or pension income you have on top of it. Whether that’s enough depends entirely on your spending, not on the portfolio size in isolation.

Can I retire on $2 million?

At 4%, $2 million supports roughly $80,000 a year before tax. For many pre-retiree households in the $500K–$5M range, $2 million is the point where the math starts to comfortably cover a moderate lifestyle plus some discretionary spending, but it still depends on your specific number from the sections above, a household carrying a mortgage into retirement or covering healthcare for two needs a different answer than one with the house paid off and Medicare fully in place.

Does the 4% rule still work?

It’s still a reasonable starting point, but current research suggests a somewhat more conservative rate for a fixed, non-flexible withdrawal strategy, while flexible spending approaches can support higher rates. Treat 4% as a first estimate to refine, not a guarantee.

What is sequence of returns risk, in one sentence?

It’s the risk that a market downturn early in retirement does outsized damage because you’re also withdrawing income at the same time, regardless of what your average return looks like over the full 30 years.

How much should I have saved by the time I retire?

There’s no single number that fits every household, which is exactly why this framework starts with spending rather than a savings target pulled from a general benchmark. A household spending $80,000 a year after Social Security needs a different number than one spending $150,000 a year, even at the identical retirement age.