What Is the FIRE Movement? A Plain-English Guide (and the Kid Angle)

FIRE stands for Financial Independence, Retire Early — a movement built on a single idea: if you save and invest a large share of your income into low-cost, diversified funds, you can eventually live off your investments and stop needing to work. The "retire early" part is a bit of a misnomer; for most people it's really about buying freedom and options, not quitting at 35.

The math: the 4% rule

FIRE has a number behind it, sometimes called your "Freedom Number." A common planning guideline is that you can support about $1 of annual spending for every $25 invested — so roughly 25× your yearly expenses is a financial-independence target. Someone who spends $40,000 a year would aim for about $1,000,000. It's a guideline, not a guarantee, but it turns a vague dream into a concrete target.

The flavors of FIRE

The engine is always the same three things

• A high savings rate — investing a meaningful slice of income.
• Time in the market — years, not months, so compounding can work.
• Low-cost, diversified investing — usually broad index funds, not stock-picking or market timing.

Of those three, time does the heaviest lifting, because of compounding.

The 4% rule and typical return figures are planning guidelines, not promises — MemoryBank is an education and display tool, not a financial advisor, and markets are never guaranteed.

Why a kid has the biggest FIRE advantage of all

Here's the part most relevant to parents: the single biggest FIRE advantage is starting young — and no one starts younger than a child. A kid whose account has decades to compound is closer to Coast FIRE than almost any adult: future growth alone can carry a modest, early-invested sum to a large number by retirement age. You can't hand your kid an early retirement, but you can hand them the runway that makes freedom possible.

That's exactly the case we make in Coast FIRE for kids — with the real scenarios and the honest caveats. If you want the how-to, building a first portfolio is the place to start.

What to do this week

1. Estimate a rough "Freedom Number" (annual spending × 25) just to see the target.
2. Notice which lever you have the most of for your kid: time.
3. Open or fund a long-horizon account and let compounding start its work.
4. Watch it grow together in MemoryBank so the idea becomes real, not abstract.