When I started working in the U.S., in my twenties, I had zero concept of personal finance. My company ran a new-hire orientation walking us through benefits and a whole alphabet soup of accounts — medical, retirement, commuter, plus some partner discount site — and I sat there completely lost. It took a few more years, some self-teaching, and a stack of sociology and economics books before I understood what that orientation had actually been worth.

Nothing in my education growing up covered money. Saving for retirement? That felt impossibly far off — not something you'd ever need to think about. That assumption is just plain wrong. It doesn't matter how old you are or what country you're in; the logic behind this kind of planning holds everywhere.

So here's what I want to share: how the U.S. government helps ordinary middle-class people build a comfortable life. Once you see how the American middle class plans, and you get the mechanics of it, you'll notice the same logic maps onto China — or wherever you happen to live.

Planning is really just about numbers

How much you have, and where you are in life. That's it.

The middle class is actually the easiest group to plan for, because most of the income is salary. You know roughly how many more years it'll keep coming, it's stable and legible, and once you factor in some inflation you can project it out — barring low-probability events like a startup exit or a winning lottery ticket.

First, though, we should define "middle class." An easy shortcut: look at the asset thresholds where estate tax kicks in in each state, or ask a bank how much you need before they'll set you up with dedicated wealth management. High-net-worth roughly starts around $5M at 40, or $10M at 50. For everyone in the $0–5M band, the goal that's caught fire in recent years is financial independence and early retirement.

A quick word on FIRE itself

For a stretch there, my feed was nothing but FIRE posts. I live in such-and-such city, I own two properties, here's my income and spending — can I FIRE? How do I prepare to FIRE?

Here's the thing: working to normal retirement age with steady monthly income, health insurance, and enough coverage or cash to absorb a big shock like a serious illness — that already is financial freedom. FIRE just means getting there some number of years earlier.

The question that actually matters isn't what age you FIRE at. It's what you do afterward. What would you want written on your tombstone? Or do you genuinely not care, and plan to slip away without leaving a trace? That's the real question. The age is a footnote.

And logically, if you can break down how to build a retirement fund at all, you can derive how to retire early from exactly the same first principles.

The three things that actually matter

When you're building a retirement plan, three factors dominate: time, principal, and risk control. These apply to any investment plan, honestly — whether you're saving up for one specific dream or shooting for full financial independence, these three are what you're working with.

Factor one: time

What do you do if you haven't started saving for retirement at all?

The central message of every piece of advice at this stage is the same: start now. The U.S. has built a genuinely well-designed system to nudge ordinary middle-class people along, and at this stage the nudge is entirely about starting early.

Step one: check whether your employer offers a 401(k). Open it, start contributing monthly. Check whether there's a match — most companies have one, where the employer contributes the same amount you do, up to some cap like 3% of your salary. The standard advice is to contribute at least enough to capture the full match. Beyond that, you can open an IRA and build a second retirement pool independent of your employer. Then set aside three to six months of expenses as an emergency fund.

Why start early?

Compounding is exponential, not linear. The usual illustration assumes a fixed return — say 4% — and shows that starting ten years earlier produces a dramatically different final number.

Of course, real markets swing. There are bulls and bears; nothing returns a steady positive number forever. But starting early means you get to play more rounds. And with inflation running, not investing is itself a loss.

I visited the Museum of American Finance in New York once, and one chart has stuck with me ever since: U.S. stock market performance from 1920 onward. Peaks, crashes, everything in between — but as long as you stayed in, the overall value trended up. You might lose money over one or two years. But if you don't panic-sell, and you keep dollar-cost-averaging into a sensibly constructed portfolio, ten-plus years is going to be profitable.

(China's A-shares are, admittedly, another story. Lately even India's market has been running circles around it.)

The design logic behind the four retirement accounts

Look at the four main U.S. retirement account types and you can reverse-engineer exactly what behavior the government is trying to produce.

How do you get people to save? Give them money. The employer match in a 401(k) is literally free money — that's the most direct lever.

Or give them money indirectly, through taxes. Contribute to a traditional 401(k) or IRA and the contribution reduces your taxable income, saving you tax today — though you'll owe tax when you withdraw later. Contribute to a Roth 401(k) or Roth IRA and you save the tax later: gains inside those accounts come out untaxed.

How do you get people to keep saving? Penalties. Pull money out of these accounts early and you pay for it, with a handful of specific exceptions.

How do you get people to start early? The Roth IRA. Gains inside it are tax-free — but contributions are subject to income limits. Once you're older, earning more, and better at investing, you're locked out. Pay your taxes like everyone else. Or, presumably, by that point you already know the more complicated ways to shelter income.

Factor two: risk control

By middle age, you need to get good at adjusting priorities and managing risk. Review your income and expenses regularly, make a plan, split your money into different buckets, and manage each according to how liquid it needs to be.

The U.S. government has thought about this too — sometimes mandating it by law, sometimes offering tax breaks to encourage you to spread money across buckets. HSAs and FSAs for medical costs (some companies even match contributions to nudge you in). 529 accounts for kids' education. Health insurance is effectively required, with proof at tax time. Anyone with a house or car has to carry insurance or they won't get the loan. And employers layer on all sorts of additional insurance options every open enrollment, building out the umbrella.

One priority worth stating plainly: retirement savings belong at the top of your list. If you're choosing between funding your kid's education and funding your own retirement, fund your retirement. Your kid can apply for scholarships and financial aid. Nobody hands out charity to a broke retiree.

This is a real philosophical split with the traditional Chinese approach. Without a mature social welfare system, the default script there was raise children to support you in old age — pour everything into the kids, hope they succeed, and count on them to help you later.

The other piece of risk control is age-appropriate allocation. As you get older, shift toward a steadier portfolio and reduce your exposure to catastrophic loss.

Same principle applies to all those Douban FIRE-group posts where someone owns a property or two, declares a net worth in the tens of millions of RMB, and asks whether they can FIRE. The answer is pretty obvious. Real estate is too illiquid to count as principal in a FIRE calculation. If you can't sell it, it isn't principal — and even if you do count it, apply a serious discount. Without enough other passive income actually generating cash flow, what you've got is paper money. Nice to look at, that's all.

Factor three: principal

Once you're past fifty, it's time to run the numbers on what retirement will actually cost. If you're short, this is the moment to delay retirement, push more into your accounts, find other income streams, downsize the house, swap for a cheaper car.

The government helps here too: past a certain age you're allowed to contribute more per year to your 401(k) than younger workers — annual catch-up contributions. The whole point is to accelerate principal accumulation.

Social Security works the same way. You can start drawing at 62, but claiming before full retirement age permanently reduces your benefit — a built-in reward for contributing a few more years and building more principal.

The 4% rule

Which brings us to the core of the whole thing: the 4% rule, also known as the 25x rule. Whenever you've saved enough principal that 4% of it per year covers your living expenses, you can retire.

Simple example. Say you earn $100K a year and spend only $10K, saving $90K — a 90% savings rate. Three years in, you have $270K in principal, throwing off roughly $10.8K a year in returns. That covers your spending without touching the principal. You're done. (In practice you'd want to pad that for inflation and unexpected costs — budget more like 8%.)

If you hit your number early and your returns stay reasonably stable, congratulations: you can retire early. That's FIRE.

And if you lose your income source and end up semi-retired? Or you simply haven't saved enough yet? Cut expenses fast — review your insurance, your credit card debt, refinance to something cheaper — then start building other income streams. All the "barista FIRE" variants people talk about in FIRE forums are the same thing at bottom: lower your cost of living, and since your principal isn't sufficient, keep earning.

The standard assumption is that you'll need about 80% of your current monthly spending in retirement — you can adjust that number, and there are plenty of online calculators that'll take your assumptions and tell you what principal you need at each stage.

Run it at $100K a year: after taxes and pre-tax account contributions (say $20K), you might take home $50K. Assume you scale down in retirement and spend $40K a year. That means you need $1M in principal — and with zero investment returns, that's 50 years of saving. Start at 20, retire at 70.

But reality has inflation, salary growth, and compounding returns working in your favor. Which is why an ordinary person who starts planning seriously in their thirties can retire comfortably in their sixties without much drama.

So, the conclusion

If you're lucky enough to be born in a stable country and not land in a terrible era, and you want more than the ordinary life, then get serious about saving and earning while you're young. With some luck you'll hit the FIRE threshold — and even then, for risk control, it's best to keep some passive income flowing.

But most people don't need to be anxious about any of this. Follow the steps the system already recommends, contribute steadily, and 25 years later you'll have enough to retire on comfortably. That's just FIRE a few years later — and in exchange, you probably got to enjoy a lot more ease along the way.