How Much Do You Need to Retire? A Realistic Framework

If you've spent any time reading about retirement planning, you've encountered the 25× rule: take your annual retirement expenses, multiply by 25, and that's your target nest egg. So if you'll spend $80,000 a year in retirement, you need $2,000,000 saved.

It's a useful rule. It's also dangerously simplistic. Treat it as a starting point — the back-of-the-envelope number that tells you whether you're in the right ballpark. Real planning requires a few more layers.

Where the 25× Rule Comes From

The 25× rule is the inverse of the 4% rule, which financial planner Bill Bengen developed in 1994. Bengen looked at every rolling 30-year period in U.S. market history going back to 1926 and asked: what's the highest initial withdrawal rate that would have survived every single 30-year window — including the worst cases (retiring in 1929, 1937, 1966)?

The answer was 4%. Withdraw 4% of your portfolio in year one, adjust the dollar amount for inflation each year after, and you'd have run out of money in zero of the historical periods.

Multiply by 25 (the inverse of 4%) and you get the target nest egg.

But the rule's assumptions matter:

• 30-year horizon. Retire at 70 and 25× is conservative. Retire at 50 and 25× may not be enough.
• U.S. historical returns. The U.S. is the global outlier on long-term equity returns. A repeat of the 20th century is not guaranteed.
• Constant withdrawal pattern. The rule assumes you increase your withdrawal each year for inflation regardless of what markets do. Real retirees usually adjust spending in down years.
• No Social Security or pension. The rule treats your portfolio as your only source of income. For most people it's not.

Start with Expenses, Not Income

The most common mistake in retirement planning is assuming you'll need 70% or 80% of your current income. That percentage is borrowed from a generation that had pensions, lower healthcare costs, and shorter life expectancies. For today's retirees the relevant number is what you'll actually spend, which has very little to do with what you currently earn.

Start by listing what your spending will look like in retirement:

Expenses that drop or disappear:
- Saving for retirement (currently maybe 10–25% of income)
- Payroll taxes (you're not earning W-2 income anymore)
- Commuting costs
- Work clothing and meals
- Mortgage (if you'll have it paid off)
- Children's expenses (if they'll be independent)

Expenses that stay roughly the same:
- Food, utilities, transportation, entertainment (assuming you don't move)
- Property taxes and home insurance
- Vacations (some retirees travel more, others less)

Expenses that increase:
- Healthcare. This is the big one. Fidelity's annual estimate puts retiree health expenses at roughly $165,000–$180,000 per individual over retirement, not counting long-term care. Medicare doesn't start until 65; if you retire earlier, you're paying ACA premiums or COBRA.
- Long-term care. Roughly 70% of people over 65 will need some form of long-term care in their lifetime. Genworth's Cost of Care Survey puts the median cost of a private nursing home room at over $115,000/year. A few years of care can easily exceed $300,000.
- Travel and discretionary spending early in retirement. Many retirees spend more in their first 10 years than they did in their last working years.

Add it all up. That's your real annual expense number. Multiply by 25 to get your starting estimate.

Now Subtract Social Security and Pension

Social Security replaces about 40% of pre-retirement income for the average earner and a smaller percentage for higher earners. For most people it's the biggest piece of retirement income — and it's inflation-adjusted, lasts as long as you do, and survives a market crash unaffected.

Get your estimated benefit from your Social Security statement at ssa.gov/myaccount. Note the benefit at age 62, full retirement age (typically 67), and 70. Most planning assumes you claim at full retirement age unless you have a specific reason to claim earlier or later.

If you have a pension, add that monthly amount as well. Pensions are increasingly rare in the private sector but still common for public sector workers (teachers, federal employees, military, state employees).

Calculation example:

• Annual retirement expenses: $80,000
• Social Security at 67: $30,000/year
• Pension: $10,000/year
• Gap that the portfolio has to cover: $80,000 − $30,000 − $10,000 = $40,000/year
• Required nest egg: $40,000 × 25 = $1,000,000

Notice how dramatically Social Security and a small pension change the picture. Without those, the same person would need $2,000,000 to support the same lifestyle. With them, $1,000,000 is enough.

Why You Should Use a Range, Not a Number

The 25× calculation assumes you know your future expenses, your future returns, your future inflation rate, and how long you'll live. None of these are knowable. The honest answer to "how much do you need to retire" is a range.

Run the same calculation with three sets of assumptions:

The truth lives somewhere in the range. The wider the gap between conservative and aggressive estimates, the more work you have to do to pin it down.

What 25× Doesn't Capture

Sequence-of-returns risk

The 25× rule treats the average return as the only thing that matters. It isn't. The order of returns matters enormously, especially in the first 5–10 years of retirement.

Retire into a bear market and you're selling shares at depressed prices to fund early-retirement spending. The portfolio may never fully recover. Two retirees with identical 30-year average returns can end up in dramatically different places depending on whether the bad years came first or last.

This is called sequence-of-returns risk, and it's the strongest argument for either:
- Holding 1–3 years of expenses in cash/short-term bonds (the "cash bucket"), so you don't have to sell stocks during a downturn
- Adopting a dynamic withdrawal rule (e.g., Guyton-Klinger guardrails) that cuts spending in down years
- Working part-time in early retirement to reduce portfolio withdrawals

Healthcare gap

If you retire before 65, you have to bridge to Medicare. ACA marketplace plans for a 60-year-old couple can run $20,000–$30,000 per year in premiums alone. This is often the biggest line item people forget. Plan for it explicitly.

Long-term care

The 25× rule assumes a constant inflation-adjusted spending pattern. Long-term care is a discrete event that can swamp the whole plan. Options:

• Buy long-term care insurance (declining in availability, increasingly expensive)
• Buy hybrid life insurance with LTC riders
• Self-insure (set aside an additional $200,000–$400,000 specifically for LTC)
• Plan for Medicaid (requires asset spend-down; usually a last resort)

Inflation surprises

The 4% rule was tested against historical inflation, which averaged about 3% over the last century. A sustained period of 5–7% inflation, like the late 1970s, can stress even a well-designed plan. Inflation-protected securities (TIPS), annuities with COLA riders, and continued growth allocation in early retirement help mitigate this.

A Better Way: Use a Calculator and a Person

The 25× rule is a sanity check. For real planning, use a Monte Carlo simulator (which runs thousands of return scenarios and gives you a probability of success rather than a single number) and ideally a CFP who specializes in retirement income planning.

Our Retirement Calculator walks through the basic math. For Monte Carlo simulation, ask any CFP — most planning software (eMoney, MoneyGuide Pro, RightCapital) includes it as standard.

The questions a good retirement planner will ask:

• When do you want to retire? Earliest you'd retire? Latest you'd want to work?
• What does an ideal week in retirement look like? (Helps estimate spending realistically.)
• Where will you live? Different states have very different costs and tax burdens.
• What's your family longevity history?
• How would you handle a 30% portfolio drop in your first three years of retirement?
• What income do you want to leave to heirs vs. spending in your lifetime?

These aren't questions a calculator can answer. They drive the assumptions the calculator uses.

The Bottom Line

The 25× rule gets you within 30%. That's useful for knowing whether you're on track or behind, but not precise enough to make actual decisions.

A realistic retirement number depends on your expense level, your Social Security benefit, your healthcare strategy, your retirement age, and how comfortable you are with risk. Build a range. Stress-test it against bad-market scenarios. Then refine with someone who's done it for hundreds of clients.

If you'd like to model scenarios with a fiduciary advisor, our directory lists CFPs who specialize in retirement income planning across every state. Verify any advisor on FINRA BrokerCheck before you commit.