What Retiring Early Actually Costs — Run the Numbers Before You Commit
Early retirement has become a genuine aspiration for a large and growing number of people. The FIRE movement — Financial Independence, Retire Early — has built a substantial…
Early retirement has become a genuine aspiration for a large and growing number of people. The FIRE movement — Financial Independence, Retire Early — has built a substantial community around the idea that with enough discipline and enough saving, you can leave the conventional working life behind in your 30s or 40s rather than your 60s or 70s.
The vision is appealing. The numbers are not always what people expect when they actually sit down to run them.
This isn't an argument against early retirement. It's an argument for looking at the real costs — not just the portfolio target, but the cascade of financial decisions that flow from retiring decades earlier than the conventional timeline — before you commit to the plan. The people who make it work do so because they went in with eyes open, not because they were optimists who got lucky.
The compounding cost of exiting the workforce early
The first and most obvious cost of early retirement is straightforward: the earlier you stop earning, the less you've accumulated.
A person who works from age 25 to 65 and invests consistently throughout has 40 years of contributions plus 40 years of compounding. A person who retires at 45 has 20 years of contributions and 20 years of compounding before the distributions begin — and the distributions then need to last potentially 50 years or more.
The difference in portfolio at retirement age isn't 50%. It's much more than that, because compounding is exponential. The last decade of a working career — years 31 through 40 — typically contributes more to the final portfolio value than the first 20 years combined, because it's the period when the largest balances are compounding.
Person A retires at 65. They contributed $1,500 per month from age 25 to 65, in a portfolio earning an average of 7% annually. At retirement, they have approximately $3,700,000.
Person B retires at 45. They contributed $1,500 per month from age 25 to 45, same 7% return. At retirement (45), they have approximately $735,000.
That's a gap of roughly $3 million — from 20 fewer years of contributions and, crucially, 20 fewer years of compounding. Person B would need to save approximately $3,300 per month from age 25 to 45 to reach the same $3.7 million figure.
The early retirement community is right that the gap can be closed with higher savings rates. But the required savings rate is substantially higher than many early retirement plans account for.
The withdrawal rate problem for long retirements
The 4% withdrawal rule — the most common guideline for how much you can safely withdraw annually from a retirement portfolio — was calibrated for a 30-year retirement. A 30-year retirement is what you're looking at if you retire at 65 with average life expectancy.
Retire at 45 and you might need the portfolio to last 50 years. The 4% rule does not have the same historical success rate over 50 years as it does over 30. Research suggests that a withdrawal rate closer to 3% to 3.5% is appropriate for retirements of 40 to 50 years.
The practical implication: the portfolio target for early retirement isn't just larger because you stop accumulating earlier. It's also larger because you need to withdraw more conservatively to protect against the longer time horizon.
Working through the math on Person B's scenario: if they plan to spend $60,000 per year in retirement, and other income sources provide $12,000 (perhaps rental income or occasional consulting), the portfolio needs to cover $48,000. At a 3.5% withdrawal rate, the required portfolio is $1,371,000 — nearly double the $735,000 they'd accumulate with the $1,500 monthly contribution plan over 20 years. The savings rate needs to be considerably higher.
The costs that don't show up in investment calculators
There's a set of financial implications to early retirement that standard FIRE calculators typically underweight.
Healthcare. For early retirees in the US, the gap between retirement and Medicare eligibility (age 65) requires privately funded health insurance. This is not a small cost. Depending on location, age, and plan choice, private health insurance for one person can run $500 to $1,200 per month in premiums, before deductibles and out-of-pocket costs. For a couple, the monthly healthcare bill can approach or exceed a mortgage payment. Running a 20-year early retirement plan without specific healthcare cost projections produces a meaningfully understated budget.
Sequence of returns risk is higher. The sequence of returns risk is the risk that poor market performance early in retirement depletes the portfolio to a level from which it cannot recover, even if long-term average returns are fine. Early retirees face a longer period of withdrawal, which means they're exposed to this risk for longer and with a portfolio they can't easily replenish by returning to work (though this is an option many FIRE practitioners keep available).
Social Security reduction. Social Security benefits are calculated based on your 35 highest-earning years. Retiring at 45 means either a 20-year gap in the earnings record (which reduces the calculated benefit) or claiming a benefit based on only 20 substantial-income years. The reduction can be significant — potentially 30 to 40% less than what you'd receive after a full working career. For early retirees who plan to claim Social Security at 62 or later, this reduction needs to be factored into long-term income projections.
Early withdrawal penalties. Traditional retirement accounts (401(k), IRA) are designed for withdrawal after age 59½. Accessing them before that age typically incurs a 10% early withdrawal penalty plus ordinary income tax. This is navigable — the Roth conversion ladder and 72(t) distributions (SEPP) are established techniques for accessing retirement funds early without penalties — but they require careful planning and at least 5 years of lead time.
Lifestyle cost inflation. A pattern that appears consistently in early retirement communities: people who retire early end up spending more than they projected. More time leads to more activity leads to more spending. Travel, hobbies, home improvements, social activities — all expand when time is no longer the binding constraint. Building in a 10–15% lifestyle cost buffer above your planned retirement spending is a conservative and realistic adjustment.
The things that make early retirement more achievable
The math is harder than many early retirement plans acknowledge, but it's not impossible. The people who retire early and sustain it tend to share a few approaches.
Geographic arbitrage. Retiring early in a lower cost-of-living location — whether domestically or internationally — dramatically reduces the portfolio required. $60,000 per year in San Francisco supports a very different life than $60,000 in Lisbon or Medellín. Some early retirees reduce their cost of living by 40–50% by moving to a less expensive area, which has the same mathematical effect as doubling the portfolio.
Partial retirement and flexible income. Many people who call themselves "retired" at 40 or 45 are doing some form of paid work — consulting, freelancing, creative projects, small businesses. This isn't a compromise; it's a structure that reduces the portfolio burden while providing the flexibility and autonomy that motivated the early retirement plan. Replacing $20,000 to $30,000 of annual portfolio withdrawals with flexible income sources allows a more conservative withdrawal rate and dramatically extends portfolio longevity.
Deep alignment with a genuinely lower-cost lifestyle. The most financially stable early retirees tend to have organically low spending — not because they're depriving themselves, but because their interests and pleasures are relatively affordable. Early retirement built on a high-spending lifestyle requires a substantially larger portfolio than early retirement built on a simpler, more intentional one.
Running the numbers for your specific situation
The calculation isn't hard, but it needs to be done with your actual figures rather than example numbers.
Your annual retirement spending (with healthcare, leisure, and realistic lifestyle inflation built in), your expected withdrawal rate given your target retirement age and life expectancy, any other income sources (Social Security at reduced benefit, rental income, occasional work), and your current portfolio and monthly savings rate — these are the inputs.
Cashowa's financial planner takes these inputs and produces the complete picture: the portfolio target, whether your current savings rate gets you there by your target date, what the timeline looks like if you increase or decrease contributions, and how changing the withdrawal rate assumption changes the required portfolio. The plan is built from your numbers, with the calculations shown, so you can test different scenarios rather than accepting a single projection.
The right response to the real costs of early retirement isn't to abandon the goal. It's to plan for it accurately, with numbers that reflect reality, so that if you get there, you stay there.
Frequently asked questions
What's a realistic savings rate to retire by 45?
It varies with your income, current savings, and target lifestyle, but saving 40–60% of after-tax income is the range that most people use to model early retirement by 45 from a late-20s starting point. Lower savings rates are possible with geographic arbitrage or flexible income expectations. Higher rates produce earlier retirement ages or larger safety margins.
Is the Roth conversion ladder really reliable?
It's legally sound and widely used, but it requires planning at least 5 years before you need the funds (because Roth conversions must season for 5 years before the principal can be withdrawn tax-free), accurate income management to keep the conversions in low tax brackets, and the assumption that tax rules governing Roth accounts don't change materially. Most early retirement plans treat it as a primary strategy but build in backup plans.
What happens if the market crashes early in my retirement?
This is the sequence of returns risk, and it's the most significant risk for early retirees. Practical mitigations: a cash buffer of 1–2 years of expenses that you draw from during market downturns (so you're not forced to sell equities at depressed prices), a flexible spending approach where you reduce discretionary spending in years with poor portfolio performance, and a willingness to generate some income in early retirement years when the portfolio is most vulnerable.
Should I pay off my mortgage before retiring early?
There's no universal right answer. Entering retirement mortgage-free reduces your fixed monthly expenses, which lowers the portfolio needed and reduces sequence-of-returns risk. Keeping a low-interest mortgage while the portfolio compounds is mathematically defensible if the expected investment return exceeds the mortgage rate. The right answer depends on the mortgage rate, your psychological relationship with housing debt, and how close to the margin your retirement plan is.
What if I don't know what I'd do if I retired early?
This is a more important question than most financial calculators address. Early retirement without a compelling structure for how to spend your time — something that provides purpose, social connection, and daily engagement — has a poor track record. Many people who achieve early retirement find themselves considering a return to some form of work within a few years, not for financial reasons but for psychological ones. The financial plan and the life plan need to be developed together.
Is early retirement still achievable if I'm starting at 35?
Yes, though the timeline is compressed. Retiring in your mid-to-late 40s from a 35 start requires a high savings rate, likely geographic flexibility, and possibly a partial retirement model rather than a full exit from income-generating work. Running the specific numbers for your situation is the only way to know what's achievable in your timeframe.