For a long time I treated "Financial Independence" as an emotional word. Freedom, security, control, the usual. It is those things, but only after you get there.
What financial independence actually means#
Financial independence (FI) means your investments generate enough to cover your annual expenses, indefinitely, without you needing to work for money. The classic shortcut is the 25x rule: multiply your annual expenses by 25 and you get a rough FI number. That number assumes a 4% starting withdrawal, which came from Bengen in 1994 and the Trinity Study in 1998, built on US stock and bond data back to 1926.
That rule "still" works as a planning anchor in 2026, but it has been refined. Morningstar's 2024 "State of Retirement Income" research put the "safe" starting withdrawal for a traditional 30-year retirement closer to 3.7% once current bond yields and equity valuations are factored in. For FIRE horizons of 40 to 60 years, independent long-run work (Karsten Jeske's extended series, Early Retirement Now) tends to land at 3.25% to 3.5% as the historically survivable starting rate. My own personal number is 3.0%.
Translated to the 25x shortcut: a 30-year retiree should think of it as roughly 27x, and a 50-year FIRE case closer to 29x to 31x.
Notice what FI is not. It is not "having a lot of money." It is not "being able to quit your job today." It is a specific relationship between what you have invested and what you spend. Spend less or invest more, or both, and the finish line moves closer.
I focus on the FI part of the FIRE movement, not the RE (Retire Early) part. I actually hate the word retirement. You might retire from your current job, but nobody really retires. You have to do something in your life. Once you reach financial independence, whether you retire is a separate decision. Plenty of people who hit FI keep working because they enjoy what they do. FI just means the paycheck is optional.
Find your number#
You do not have to guess. Use the LibreLeo FIRE Calculator to plug in your expenses, savings rate, and expected return. You will get a target number and a rough timeline. If you earn in one currency and plan to retire in another, the extra layer below matters more than the calculator suggests. A single-currency FI number assumes you never cross a border.
FIRE flavors that are actually real#
The internet has invented a hundred variations. Most are marketing. Five of them describe real, distinct approaches:
CoastFIRE. You have invested enough that compound growth alone will get you to full FI by a traditional retirement age, without you contributing another cent. You still work to cover your current expenses, but you have stopped saving toward retirement. The nest egg does the compounding on its own.
BaristaFIRE. You have enough invested to cover most of your expenses but not all. You take on part-time or lower-stress work to cover the gap, and often to keep benefits (healthcare, insurance, visa status). Named after the classic example of working at a coffee shop for the paycheck and the coverage.
LeanFIRE. Retire on a smaller nest egg by keeping expenses low. Typical LeanFIRE spending sits below roughly $40,000 a year, which lets you hit FI with a portfolio in the mid-six figures rather than mid-seven. Requires either genuine frugality or a low cost of living.
FatFIRE. Retire on a larger nest egg that supports a higher spending level. Typical FatFIRE targets sit above $100,000 a year in spending, which puts the FI number in seven-plus figures. Takes longer to reach, not shorter. The trade is more work now for more optionality later.
GeoFIRE (Geoarbitrage FIRE). You reach FI at one cost of living and spend it at another. Earn in a strong currency and retire in a weaker one, or move from a high-cost city to a low-cost region within the same country. This is the flavor most globally-mobile investors are already living, whether they call it that or not.
You will see other terms floating around: ModerateFIRE, DIYFIRE, HybridFIRE. Most are made up, or lightly re-labeled versions of the five above. Do not spend energy picking a label. Pick the number and the levers.
The five levers that actually get you there#
There are only a handful. Every FI plan pulls some combination of these.
1. Save a real percentage of your income#
The single biggest determinant of how fast you reach FI is your savings rate. Not your income, not your returns, your savings rate. The reason is that a higher rate shrinks your FI number AND grows your contributions in the same move, so it compounds on both sides.
At a conservative 5% real return and the 25x rule, the shape is roughly this:
| Savings rate | Years to FI |
|---|---|
| 10% | about 50 |
| 25% | about 32 |
| 40% | about 22 |
| 50% | under 17 |
| 60% | about 12 |
| 70% | under 9 |
The numbers change a little with different return assumptions, but the shape does not. Every ten points you add to your savings rate past 30% buys back years of your life.
Track your savings rate as a first-class metric, not an afterthought. Set an automatic transfer on payday. What you never see, you do not miss.
2. Invest through broad, low-cost index funds#
Compound growth is what turns saving into wealth. To capture it, you need to be invested in productive assets, not sitting in cash. Broad index funds are the default because they diversify across hundreds or thousands of companies at a cost of a few basis points a year.
The long-run return numbers are the reason this works. Over more than a century, global equities have delivered roughly 5% a year in real terms, after inflation (per the UBS Global Investment Returns Yearbook, which runs from 1900 to 2024). US large-cap stocks have delivered closer to 7% real over similar windows. Those averages survive wars, depressions, oil shocks, and a global pandemic. They only reach you if you stay in the seat during the ugly years.
There is nothing clever about picking a global market cap fund or an S&P 500 tracker. That is the point. You are not trying to beat the market. You are trying to own the market cheaply and let time do the heavy lifting.
The move: pick a global equity index fund, or a two-fund equity plus bond mix, and contribute automatically. If you are a non-US person, use Irish-domiciled UCITS ETFs rather than US-domiciled ones. Lower dividend withholding drag, and no US estate-tax exposure on the fund itself. The size of that drag surprises most people the first time they see it modelled.
3. Keep costs and fees low#
A 1% expense ratio does not sound like much. Over a working lifetime of compounding it can cost you a quarter to a third of your final wealth, depending on the return assumption and horizon. Fund fees, advisor fees, platform fees, and currency conversion costs hit the same line.
In 2026, there is no excuse. Broad-market ETFs now run at expense ratios between 0.03% and 0.22%, including the Irish-domiciled UCITS versions used by non-US investors. Paying a legacy fund 1% or more for the same underlying exposure is an actively expensive mistake.
For expats it goes further. Holding the wrong ETF domicile as a non-US person pushes your dividend withholding rate higher and exposes you to US estate tax on US-situs assets above the $60,000 non-resident threshold. Neither of these is priced into the expense ratio. Both show up in your actual after-tax, after-conversion return.
The move: use funds with expense ratios under 0.25%. Match your ETF domicile to your tax residency. Convert currencies through a low-cost provider, not your retail bank.
4. Stay out of high-interest debt#
Debt is not universally bad, but consumer debt (credit cards, buy-now-pay-later, personal loans) usually is. US credit card APRs averaged around 22% through 2025 and into 2026, which compounds against you at a rate no equity portfolio consistently beats. Every dollar of your paycheck that goes to servicing it is a dollar not invested.
The move: clear high-interest debt before you accelerate investing. Below roughly 6% interest, the calculus flips and paying it down slower while investing can win. Above that, kill the debt first.
5. Protect the plan from yourself#
Almost no FI plan fails on the spreadsheet. They fail because people do things during a downturn that they would never do on paper. Selling in a crash. Chasing whatever went up last year. Tinkering with an allocation that was already fine.
The strongest defence against yourself is automation. Auto-invest on the same day every month. Set a rebalancing rule once or twice a year. Write your plan down while you are calm. When the market falls, read what you wrote and do that.
The move: decide the plan when it is easy, and follow it when it is hard.
The extra layer if you live and earn across borders#
Everything above works no matter where you live. But if you earn in one currency, invest in a second, and plan to retire in a third, you have a layer most FI writing ignores.
- Currency drift. The relationship between the currency you earn and the currency you plan to spend can shift 20% to 40% over a working lifetime. USD/EUR has swung roughly from 0.85 to 1.60 and back inside the past twenty years. If you save "enough" measured in your earning currency and it drifts against your retirement currency, your real FI number moves against you without you doing anything wrong.
- Tax residency. Your current tax residency determines what you owe today. The residency you retire in determines what you owe on withdrawals and pensions. These are rarely the same country for globally-mobile investors, and the tax treaties in between matter.
- Fund domicile. For non-US persons, Ireland-domiciled UCITS ETFs typically beat US-domiciled ETFs on both dividend withholding and estate exposure. Same underlying holdings, different tax wrapper.
- Cash currency. Idle cash sitting in the wrong currency is a silent, grinding loss. If you know your retirement currency, start tilting your cash reserve toward it well before you need it.
For the long-form version of the expat side, the Expat FI Playbook walks the full stack: fund domicile, cash currency, tax residency, and the sequence to build it. If you live across borders, that is the piece to read next.
Why people who save still do not reach FI#
Saving is necessary. It is not sufficient. The most common ways a saver still misses the target:
- Saving cash instead of investing it. Cash in a bank account roughly keeps up with inflation in a good year and loses to it in most. It does not compound. A twenty-year cash pile buys less than the day you started stacking it.
- Investing without a plan. Buying whatever a colleague recommended, chasing whatever went up last year, holding fifteen overlapping funds that all track the S&P 500. Activity does not equal progress.
- Underestimating expenses. The FI number is 25x to 30x annual expenses. If your real expenses are 30% higher than what you budgeted, your FI number is 30% higher too. Track actual spending for a full year before you set a target.
- Ignoring currency and taxes. See the layer above. Nominal numbers in the wrong currency, or without a tax-aware after-return, produce a target that is too optimistic.
- No buffer. Life happens. A proper emergency fund and short-term reserve is what keeps you from selling investments at the worst possible moment to cover a real bill.
The through-line#
The path to financial independence is not about being smart. It is about setting a plan simple enough to actually follow, and following it long enough that compounding does its thing. The five levers above are not new. What most people miss is not the levers, it is the willingness to hold the plan through the boring years.
If you live across borders, add the extra layer. Match your fund domicile to your tax residency. Model your FI number in the currency you will spend. Keep your cash tilting toward that currency well before you need it.
Then let time do what it is very good at.
