FIRE: How Much Is Enough?
This is a letter to my kids, and to a younger me who didn’t run the numbers early enough. FIRE means Financial Independence, Retire Early. Stripped down, it is one sentence: your money makes enough on its own to cover your life, so you no longer have to sell your hours.
That’s it. Passive income covers expenses. The day it does, work becomes a choice.
Two levers, that’s all
There are only two things to pull.
Grow passive income. That takes assets and time. You buy pieces of productive things — for me, broad index funds — and you let them compound. No shortcut around the time part. You save, you invest, you wait.
Shrink expenses. Not just refusing to spend more as you earn more. Actually choosing to live below your means, on purpose. This is the harder lever, and the one most people pull worst.
When the income from the first equals the spending in the second, you’re free.
How much do you need? Picture a fruit tree.
Here is the whole idea in a way a five-year-old can hold: your savings are a fruit tree. Each year it grows new fruit. You eat the fruit. You never chop down the tree.
How much fruit? The rough rule people use is 3–4% a year. On a $1,000,000 portfolio, that’s $30,000–40,000 you can spend annually and still keep the tree alive forever. The logic: stocks return maybe ~10% a year on average, inflation eats ~3%, so spending 3–4% leaves the real value of the tree intact.
Now — honesty, because this is exactly the kind of claim I have to be careful with. “10% minus 3%” is an average dressed up as a promise. Markets crash the year you retire. Inflation spikes. The 4% rule is a guideline, not a law of physics. So treat it as a starting estimate, not a guarantee, and build in a margin.
If you want to run your own number — your portfolio, your spending, your margin — I built a small calculator for exactly this: pinkelephant.space/fire.
One more tool: a Securities-Backed Line of Credit (SBLOC). When interest rates are low, instead of selling shares you can borrow against them. You don’t trigger capital-gains tax, and the tree keeps growing. Buy, borrow, die — the shares pass to your kids with the gains never taxed in your lifetime. Powerful when rates are low. Dangerous if rates rise and the market drops at the same time, so it’s a tool, not a religion.
Write down what your life actually costs
A clean $1M sounds like enough until you write down what your life actually costs. Most lives break into a handful of buckets:
- Housing — usually the biggest, and the easiest one to let creep upward.
- Transportation — smaller, but the same trap on a smaller scale.
- Healthcare — a fixed necessity, no negotiating it away.
- Groceries — ordinary, steady.
- Kids’ education — an active, fund-it-now phase.
- Travel — the discretionary one, the fund for the good memories.
I’m writing this down instead of just stating a principle because the principle (“live below your means”) slides off people for years. The pattern is always the same: you earn more, you buy a bigger house and a bigger car, and your yearly cost rises enough to lift the whole target. Lifestyle creep is easy to climb into and slow to climb out of.
So your number depends on your spending
Your number isn’t a fixed figure off the internet — it’s your real annual spending divided by your safe withdrawal rate, plus margin. Inflate the spending and you inflate the target. Hold the spending down and the target shrinks. That is the entire game.
And there’s a quiet reward waiting past the line: if the tree keeps growing and you don’t let your lifestyle grow with it, at some point the fruit outpaces what you eat. The portfolio grows even while it feeds you. That’s the actual destination — not just covered, but pulling away.
Where you live is a lever too
Geography decides how fast money burns. Two ideas worth weighing:
- Lower the burn. A spell in a lower-cost place during early retirement means a smaller burn, so the tree compounds harder while it’s still young.
- Time the higher-cost years. Return to a higher-cost place later, once the portfolio is deep enough to absorb it.
Then the hard tension. I want my kids to reach FIRE too — and the cynical optimizer says move toward a big tech hub for the income and the network. But that directly attacks the FIRE number: it drastically inflates the baseline cost of just surviving. It’s the same lifestyle-creep trap, scaled up to a whole city. I haven’t fully resolved this one. I’m naming it because it’s real, not because I’ve solved it.
The whole thing in one breath
Fight lifestyle creep. Protect the tree. Let compounding do the heavy lifting. Everything else is detail.