Financial Independence: How to Calculate Your Number and Plan the Path

Financial independence means having enough accumulated wealth that your passive income (interest, dividends, rental income) covers your living expenses — without needing to actively work.

The FIRE movement (Financial Independence, Retire Early) popularised this idea, but let’s clear up some misconceptions:

• It’s not only for high earners: Your savings rate matters more than your income. Someone earning €2,500 who saves 30% can get there before someone earning €6,000 who saves 5%.
• It doesn’t mean stopping work: Many financially independent people continue working — but on projects they choose, free from financial pressure.
• It doesn’t require an extreme lifestyle: There are FIRE variants for every profile: Lean FIRE (frugal living), Fat FIRE (comfortable living), and Barista FIRE (semi-retirement with part-time work).

Traditional retirement at 67 is actually a form of FIRE — just with a longer timeline. The difference is that by planning actively, you can shorten that timeline significantly.

The calculation is surprisingly simple and is based on the 4% rule: if you withdraw 4% of your portfolio per year, it statistically lasts 30+ years (based on the Trinity Study).

The inverse formula gives us the FIRE number:

Annual expenses × 25 = Financial independence number

Practical examples

• Expenses of €1,800/month → €21,600/year → €540,000
• Expenses of €2,500/month → €30,000/year → €750,000
• Expenses of €3,500/month → €42,000/year → €1,050,000

Why 25× and not another multiple?

The factor of 25 comes directly from the 4% rule (1 ÷ 0.04 = 25). Some more conservative planners use 30× or 33× (corresponding to withdrawal rates of 3.3% or 3%). The choice depends on your risk tolerance and time horizon.

Important note: These calculations are educational and based on historical data. They do not constitute financial advice. Every situation is unique.

Reaching financial independence depends on three variables — and you can work on all three simultaneously:

1. Reduce expenses (the most powerful)

Every euro you cut from expenses has a double effect: it lowers your FIRE number and increases your monthly savings. If you reduce expenses from €2,500 to €2,000/month:

• FIRE number: from €750,000 to €600,000 (minus €150,000)
• Extra savings: +€500/month to invest

2. Increase income

More income means more room to save — but only if you don’t increase expenses in the same proportion (the infamous lifestyle inflation). Common approaches: career progression, side work, passive income streams.

3. Invest the gap

Money sitting in a savings account loses value to inflation. Invested in a diversified way (for example, global ETFs), it has historically generated returns of 7–8% per year before inflation. This is where compound interest works its magic.

The most impactful lever is almost always reducing expenses, because it acts on both sides of the equation simultaneously.

The most important discovery of the FIRE movement is this: the time to financial independence depends almost entirely on your savings rate — not on your absolute income.

Assuming an investment return of 5% above inflation:

• Savings rate 10%: ~51 years
• Savings rate 20%: ~37 years
• Savings rate 30%: ~28 years
• Savings rate 50%: ~17 years
• Savings rate 70%: ~8 years

A concrete example

With an income of €2,500 and expenses of €1,800:

• Savings: €700/month (savings rate of 28%)
• FIRE number: €540,000
• Estimated time: ~28 years (starting from zero, invested at 5%)

If you manage to reduce expenses to €1,600 (savings rate of 36%), the timeline drops to ~22 years and your FIRE number falls to €480,000.

The econklar report automatically calculates your savings rate as one of the pillars of your financial health score.

• “I need to be extreme”: False. You don’t need to eat rice and beans every day. Even a savings rate of 20–30% significantly accelerates the journey — and it is sustainable long-term.
• Ignoring inflation: €540,000 in 28 years will not be worth the same as today. Always use real values (adjusted for inflation) in your calculations.
• Forgetting healthcare and taxes: Healthcare costs tend to increase with age, and investment income is taxed. Include a safety margin.
• Lifestyle inflation: The biggest enemy of financial independence is increasing your spending every time your income rises. Keep your lifestyle stable and invest the difference.
• Focusing only on the destination: The journey matters as much as the destination. Building financial discipline, reducing money stress, and having an emergency fund are enormous wins — even if you never reach full FIRE.

Financial independence is not magic. It requires discipline, consistency, and patience. But the maths is on your side.

The econklar financial report is designed to give you visibility into your progress towards financial independence:

• Financial freedom number: The report automatically calculates your FIRE number based on your actual expenses.
• Savings rate: One of the pillars of the financial health score — shows how much of your income you are effectively saving.
• Financial health score: A 0–100 score that evaluates your current situation across 4 pillars: cash flow, emergency fund, debt ratio, and savings rate.
• What-if scenarios: Discover what happens if you increase your savings by €100, €200, or €300/month. Small changes make enormous differences over time.

All of this without tracking daily expenses, without linking bank accounts, without creating an account. Just your numbers, your plan, your path.