The Disturbing Math Nobody Shows You About Retirement
I was in the elevator with my boss when he made a rude comment about my car.
He drove a Porsche Cayenne. I was still driving the rusty Mazda sedan I’d had since college. We worked at the same company, he knew roughly what I made, and the math apparently didn’t add up for him. “I can’t believe you drive that piece of s**t to work.”
I didn’t say much in the moment. What I was thinking, and what I’ve thought every time I’ve remembered that exchange in the years since, was that we were having two completely different conversations about what money is for. He was looking at my car and seeing someone who couldn’t afford better. I was looking at his car and seeing someone who’d locked himself into earning at a particular pace for a particular number of years, whether he wanted to or not.
What “Average” Buys
The average American worker contributes somewhere between $2,000 and $4,000 a year to retirement out of their own pocket. With the employer match, that’s about 8% to 10% of income going in. Every benefits portal and budgeting app on the market will tell you this is responsible.
Run it forward and the picture is harder to feel good about.
A 40-year-old earning $80,000, saving 10% all-in at a 6% return against 3% inflation, lands at 67 with a portfolio in the range of $1.1 to $1.3 million. Apply the standard 4% withdrawal rule and that’s roughly $44,000 to $52,000 a year in today’s dollars. Add Social Security for a middle earner (around $24,000), and you’re at $68,000 to $76,000 pre-tax in retirement.
If you were earning $80,000, that’s a step down. If you were earning $120,000 or $150,000, which is where most of the people reading this actually are, it’s a different life. Smaller house or no house. Travel becomes a question instead of an assumption. Healthcare costs you can’t really plan for hit a budget that wasn’t built to absorb them.
And that’s the version where things go right. Drop in a bad sequence of market years right when you retire (which is when sequence-of-returns risk does the most damage), or a serious health event, or just living to 92, and the math gets meaningfully tighter.
The unsettling thing about this is how many people are heading toward exactly this outcome and have no idea. They’re not making bad decisions. They’re not running up credit card debt or buying timeshares. They’re contributing what HR set up, getting the match, holding a target date fund, and assuming the system is working. The system is working. Its job just isn’t what they think it is.
The Soft Version
The information isn’t hidden. The math is on every retirement calculator in the country. So why doesn’t anyone ever frame it this way?
Two reasons, I think. The first is that telling someone in their 30s that their current trajectory produces a retirement they wouldn’t choose is an uncomfortable conversation, and most of the institutions positioned to have it would rather not. Advisors want you to feel good about working with them. Apps want you to feel good about using them. Plan sponsors want you to feel good about your benefits. Nobody in that chain is incentivized to do the math out loud and let you sit with the answer.
The second is that the people who’d benefit most from running the numbers are the ones with the least bandwidth to. They’re 32, deep in a demanding job, maybe a mortgage, maybe a kid coming. The 401(k) is the one thing that’s already handled. The last thing anyone wants to discover is that the one handled thing isn’t actually handled.
The One Lever
Income matters far less than people think. The thing that determines whether you’re financially independent at 55 or working part-time at 70 isn’t what you earn. It’s the percentage of what you earn that you actually convert into investments.
Rough brackets, with the caveat that the exact numbers shift with your income and what you spend.
Around 5% to 10% is the average path. Modest portfolio at the end, heavy reliance on Social Security, no slack for anything unexpected. This is where most people land and stay.
At 15% to 20%, the math changes character. You build something with real flexibility. A bad market year in your early 60s doesn’t blow up the plan, and your retirement income roughly tracks your working income instead of stepping down.
At 25% or higher, you’re in optionality territory: meaningful early retirement on the table, real runway for a career change, the ability to take a year off without it derailing anything. I wrote about that shift, from accumulating a number to building a life with options, in Why I Stopped Trying to Be Rich and Started Trying to Be Free.
Two people earning $120,000 can be in completely different financial realities at 60. The difference is almost never income or talent or luck. It’s the savings rate, started earlier, and protected from lifestyle inflation along the way.
The Mazda Math
When my boss made the comment about my car, I was earning over $100,000 and routing a significant percentage of it into investments. The Mazda was a deliberate choice, not a constraint. My costs were low, my savings rate was high, and the gap between what I made and what I spent was building me an exit.
He was, presumably, doing the opposite. The Porsche, the lifestyle that goes with the Porsche, the income required to maintain the lifestyle that goes with the Porsche. None of which I’m judging him for. I’m just noting that the same income produces wildly different outcomes depending on what percentage of it leaves your account every month before you have a chance to spend it.
The order things get funded in matters too, and this is the part I see people get wrong most often. Capture the employer 401(k) match first. Then fund a Roth IRA for tax-free growth. Then max the HSA if you have one available, because it’s the most tax-advantaged account in the entire code and almost nobody uses it the way it was designed to be used. Then back to the 401(k) to max the deferral. Then anything left over goes into a taxable brokerage where you have full flexibility but no tax wrapper. Most people stop at “got the match” and never realize the most powerful accounts in the system are still empty.
I also keep a six-month emergency fund in a high-yield savings account, not because I’m waiting for a disaster but because the alternative is a system that requires nothing to ever go wrong. That isn’t a system. That’s hope with a spreadsheet.
Just Open It
Stop asking whether you’re saving enough. The framing is too vague to produce a useful answer, and “enough” is exactly the kind of word that lets you put off looking forever.
Ask what your current savings rate actually buys you in 30 years.
Vanguard, Fidelity, and NerdWallet all have free retirement calculators. Any of them is fine. Plug in your age, your income, your real savings rate including the match, a reasonable return assumption. Ten minutes.
Most people reading this won’t do it. The ones who do will probably spend the rest of the week quietly recalibrating something.
That’s the whole point. The number on the screen isn’t a verdict. It’s information you didn’t have ten minutes ago, and almost everyone who looks discovers they have more room to move than they thought.
I think about my old boss sometimes. He’s probably still driving his porsche to the office. Meanwhile, I’m driving my porsche to the beach on a Tuesday.
What to Read Next
📖 The Simple Path to Wealth by JL Collins. If the math in this article rattled you, Collins is the calmest voice on what to do about it. Index funds, high savings rate, long horizon. The whole playbook in a weekend.
📖 The Psychology of Money by Morgan Housel. Housel is especially good on why we underestimate how long retirement actually lasts and overestimate our ability to course-correct later.
📖 Die With Zero by Bill Perkins. The counterweight. Once the system is built, Perkins makes the case for actually using the money instead of hoarding it out of fear. The right answer is somewhere between him and Collins.
🎧 All three are excellent on Audible. The free trial gives you one credit to start.
As an Amazon Associate, I earn from qualifying purchases.