A man I’ll call Phil Olmstead sat across from me two years ago with a single sheet of paper and a look on his face I’ve seen a hundred times. Phil was fifty-nine. He worked in supply chain management for a mid-size manufacturer in Fond du Lac. The company was restructuring, and they’d offered him a buyout: eighteen months of salary, continued health coverage for twelve months, and a handshake. He had until the end of the month to decide.

Phil had $740,000 in his 401(k), a paid-off house worth about $230,000, and a wife, Denise, who was fifty-seven and working part-time at a clinic. Their combined Social Security at full retirement age would be roughly $4,200 a month. They had no pension. They had no debt beyond a $14,000 car loan. Phil wanted to know one thing: could he take the buyout and never go back to work?

The answer, as it usually is with early retirement, was not yes and not no. It was: let’s look at the math.

That’s what I want to do here. Not the breathless version of early retirement you find online, where thirty-two-year-olds save 70% of their income and retire to a van. I’m talking about the version that matters to the person reading this: retiring at fifty-nine, or sixty-one, or sixty-three. Leaving a few years before the traditional finish line. Taking the buyout. Walking away when you could technically keep going.

It’s doable more often than people think. But it requires you to look clearly at four specific problems that don’t exist when you retire at sixty-five or later. I call them the four landmines, because they’re buried in the path and they will blow up your plan if you don’t know where they are.

Let me show you where they are.

The healthcare gap

This is the one that stops the most people, and honestly, it should make you think carefully. Medicare begins at sixty-five. If you retire at fifty-nine, you have six years of healthcare to cover on your own. If you retire at sixty-two, you have three years. Those years are not cheap.

When Phil’s buyout coverage ran out after twelve months, he and Denise would need to find their own insurance. An ACA marketplace plan for a couple in their late fifties in Wisconsin, at their expected income level, would run somewhere between $1,400 and $2,100 a month, depending on the plan and whether they qualified for subsidies. That’s $16,800 to $25,200 a year, just for health insurance premiums. Deductibles and copays come on top of that.

Here’s the part people miss: your ACA subsidy depends on your modified adjusted gross income. If you’re pulling money out of a traditional 401(k) or IRA to live on, those withdrawals count as income. Pull too much and your subsidy shrinks or disappears. Pull too little and you can’t pay your bills. There’s a planning sweet spot, and it’s worth finding before you sign anything.

Phil and Denise had options. Denise’s part-time job at the clinic offered health benefits if she moved to thirty hours a week. That would cover both of them until Phil hit sixty-five. It wasn’t the “both of us retire together” fantasy, but it was a $20,000-a-year solution to a $20,000-a-year problem. Sometimes the best retirement plan involves one spouse working a bit longer, and there’s nothing wrong with that.

Sequence of returns risk in the early years

This is the landmine that the retirement calculators don’t show you clearly enough. Here’s what it means in plain language.

Suppose you retire with $800,000 and you’re withdrawing $40,000 a year. Over thirty years, the market might average 7% annually. Your calculator says you’re fine. But averages lie when you’re spending the money down.

If the market drops 20% in your first year of retirement, your $800,000 becomes $640,000. You still need your $40,000 to live on. Now you’re pulling $40,000 from a $640,000 portfolio, which is a 6.25% withdrawal rate, not the 5% you planned. And the damage compounds. Even if the market recovers the next year, you sold shares at the bottom to pay your grocery bill. Those shares aren’t there anymore to participate in the recovery.

This is the opposite of dollar-cost averaging. When you were working and contributing, a down market meant you were buying cheap. Now that you’re withdrawing, a down market means you’re selling cheap. The math works against you with the same force it once worked for you.

The fix isn’t to avoid retiring. The fix is to have two to three years of living expenses in cash or short-term bonds that you can draw from while leaving your stock portfolio alone during a downturn. Phil had about $38,000 in a savings account. I told him he needed more like $100,000 to $120,000 in safe, accessible money before he walked out the door. That meant either building up that cash reserve over the next year while still employed, or using a portion of his buyout to create it.

This is boring planning. It’s also the difference between a retirement that survives a bear market and one that doesn’t.

The Social Security penalty

You can claim Social Security as early as sixty-two. But “can” and “should” are different conversations.

If your full retirement age is sixty-seven, and you claim at sixty-two, your benefit is permanently reduced by about 30%. For Phil, that meant roughly $2,940 a month instead of $4,200 a month, for the rest of his life. Over twenty years, that’s a difference of more than $300,000 in total benefits.

I’ve written about this in detail before, including the specific math and the break-even calculations that tell you when waiting actually pays off. The short version: for most people in good health, waiting until at least full retirement age, and ideally until seventy, puts significantly more money in your pocket over a normal lifespan. Claiming early because you’re nervous about the program’s solvency is almost always a mistake based on a misunderstanding of how the trust fund actually works.

For early retirees, the temptation to claim at sixty-two is enormous. You’ve stopped working. The income has stopped. Social Security is sitting right there. But claiming early to fill an income gap is one of the most expensive financial decisions you can make. It’s using a permanent discount to solve a temporary problem.

Phil’s better option: bridge the gap between fifty-nine and sixty-seven with his 401(k) withdrawals (carefully managed for the ACA subsidy issue I mentioned above), and let his Social Security benefit grow. Every year he waited past full retirement age added 8% to his monthly check, guaranteed. And even the years between sixty-two and sixty-seven recovered about 7% per year of that early-claiming penalty. Find me another investment with a guaranteed return like that.

The longer runway

Here’s the landmine that’s purely mathematical and gets almost no attention. If you retire at sixty-five and live to eighty-five, your money needs to last twenty years. If you retire at fifty-nine and live to eighty-five, your money needs to last twenty-six years. That’s 30% more retirement to fund.

The old rule of thumb said you could withdraw 4% of your portfolio annually and be reasonably confident it would last thirty years. But that rule was designed for a sixty-five-year-old with a thirty-year horizon. If you’re fifty-nine, you might need thirty-five years or more. A 4% withdrawal rate over thirty-five years has a meaningfully higher failure rate in historical simulations.

What does that mean in dollars? If you need $50,000 a year in retirement income beyond Social Security, the 4% rule says you need $1,250,000. But if you’re retiring six years early and need a more conservative 3.5% withdrawal rate to account for the longer timeline, you need about $1,430,000. That’s an extra $180,000 in savings, which is roughly three to four more years of aggressive saving for most people.

That’s not an impossible number. But it’s a real number, and you need to know it before you hand in your badge.

Phil, at $740,000 with Social Security starting at sixty-seven, was actually in decent shape for his spending needs. He and Denise lived on about $52,000 a year after the mortgage was paid off. The buyout money would cover his first eighteen months. Denise’s health benefits would handle the insurance gap. And if they managed their 401(k) withdrawals carefully in the bridge years, the math worked. Not with room to spare. With room to plan.

When early retirement is the right answer

I don’t want to leave you thinking early retirement is a minefield with no safe path. It isn’t. I’ve watched dozens of people do it successfully, and they tend to share a few things.

They have low fixed costs. A paid-off house makes an enormous difference. Phil and Denise’s $230,000 house wasn’t flashy, but the fact that they didn’t owe anyone a monthly payment freed up roughly $1,200 a month that renters or mortgage-holders would need to cover.

They have a healthcare plan that isn’t just “we’ll figure it out.” Whether it’s a spouse’s employer coverage, a carefully managed ACA plan, or a part-time job specifically chosen for its benefits, the healthcare gap is solved before the resignation letter is written.

They have margin in their numbers. Not perfection, but margin. If the plan only works when the market returns exactly 7% every year and neither of them gets sick and the car lasts forever, that’s not a plan. That’s a wish. The plans that work have a cushion built in, usually in the form of spending flexibility. People who can cut their spending by 15% in a bad year without genuine hardship are in a completely different position than people who can’t.

And they have something to retire to, not just from. I’m a money columnist, not a therapist, but I’ve seen enough people retire into a void to know that the financial plan is only half the question. The people who do well have something that gets them out of bed on a Tuesday in March. Phil was going to restore a 1967 Chris-Craft he’d been looking at for three years and start volunteering at a vocational program. He had a plan for his days. That matters more than most financial advisors will tell you.

A framework for your own situation

If you’re sitting where Phil sat, thinking about whether early retirement is possible for you, here’s how I’d suggest you work through it.

First, know your number. Not a vague sense that you “have enough.” The actual annual spending you need, with everything included: taxes, insurance, property taxes, car maintenance, the trip to see the grandchildren, the furnace that will need replacing. Be honest. Most people underestimate their spending by 15% to 20%.

Second, stress-test the healthcare gap. Get actual quotes from the ACA marketplace. Calculate what your income will look like in retirement and what that means for your subsidy. If a spouse has access to employer coverage, understand exactly what it costs and what it covers. I’ve written about the healthcare costs that catch people off guard, including the dental and vision expenses Medicare won’t touch, in my piece on the long-term care conversation that most families are avoiding.

Third, build your bridge. Map out every year from the day you stop working to the day Social Security starts (at whatever age you choose to claim). For each year, write down where the money comes from. 401(k)? Taxable savings? Part-time work? Buyout money? If any year has a gap, you’re not ready yet. That doesn’t mean never. It means not yet.

Fourth, ask the spending question. Can you cut your annual spending by $8,000 to $10,000 if you need to? If a bear market hits in year two, can you skip the trip, drive the car another year, tighten the belt for twelve months without misery? If yes, your plan has the flexibility it needs. If no, you need a bigger cushion or a later date.

And fifth, talk to somebody who isn’t selling you something. A fee-only financial planner who charges by the hour or the project, not someone earning a commission on the products they recommend. One good session with the right planner, with all your numbers on the table, can tell you more than six months of worrying at three in the morning.

What Phil decided

Phil took the buyout. But not immediately. He negotiated a sixty-day extension on his decision deadline, used that time to move Denise to thirty hours at the clinic, built up his cash reserve to $85,000, and ran the numbers with a fee-only planner in Appleton who charged him $1,500 for a comprehensive plan. He told me later that $1,500 was the best money he’d ever spent, which is something I hear from people who actually do the planning and almost never hear from people who skip it.

He’s sixty-one now. The Chris-Craft is about half restored. Denise still works her thirty hours and says she’ll stop at sixty-two. Their plan is holding.

Early retirement isn’t a fantasy, and it isn’t a reckless gamble. It’s a math problem with four specific complications. Once you know what they are, you can solve for them. The people who get into trouble are the ones who don’t know what they don’t know. The people who do well are the ones who sit down, look at the numbers, and make the plan before they make the leap.

If you’re thinking about it, you’re already ahead of most people. The next step is the math. And the math, I promise you, isn’t as scary as the uncertainty of never running it.

You might also want to read my piece on why so many retirees struggle to spend the money they saved. It’s the other side of this coin, and it matters more than you’d think. And if you’re weighing whether your life insurance still makes sense at this stage, that’s worth a look too.