How to Calculate and Optimize Your FIRE Number in 2026 as a European

Calculating your FIRE number is the cornerstone of any early retirement plan, but for Europeans in 2026, the process requires more nuance than simply multiplying your annual expenses by 25. Factors like inflation, health insurance, country-specific taxes, and cost-of-living differences across Europe can shift your target by tens or even hundreds of thousands of euros. In this tutorial, you’ll learn a step-by-step, EUR-focused approach to calculate your FIRE number in Europe—and how to optimize it for your personal circumstances.

As we covered in our Essential 2026 Guide to Building a Portfolio for European FIRE Seekers, understanding your FIRE number is the first—and arguably most important—step on your path to financial independence. This guide dives deeper into the calculation process, ensuring your number is realistic, country-specific, and robust for the realities of European living.

Step 1: Calculate Your True Annual Spending

What to do: Gather your actual annual spending data from the past 12 months. This should include rent or mortgage, groceries, utilities, transportation, insurance, medical expenses, travel, leisure, and any recurring costs.

• Export your 2025 bank and credit card statements to a spreadsheet.
• Categorise each expense (many banks like N26, Revolut, and Bunq offer in-app categorisation).
• Add up each category to get your total annual spending in EUR (€).

Why it matters: Underestimating your spending is the most common FIRE misstep. If you forget irregular costs (like car repairs, gifts, or holidays), your FIRE number will be too low, risking an underfunded retirement.

What can go wrong: Relying on monthly averages can miss seasonal or one-off expenses. Always use a full year’s data if possible.

Step 2: Adjust for Inflation to 2026

What to do: Increase your annual spending figure to reflect expected 2026 prices. Most European countries have seen inflation between 2% and 6% annually since 2022, but check the latest Eurostat projections or your national statistics office.

• If your 2025 spending is €32,000 and you expect 3% inflation, your 2026 estimate is:
  €32,000 × 1.03 = €32,960
• For multi-year projections, compound the inflation rate (e.g., for 2 years at 3%: €32,000 × 1.03 × 1.03 = €33,920).

Why it matters: Underestimating inflation can erode your purchasing power, making your FIRE number obsolete within a few years.

What can go wrong: Using a single, outdated inflation rate for all years. Always check the latest figures and update your projection annually.

Step 3: Factor in Health Insurance and Taxes (Country-Specific)

What to do: Research your country’s health insurance system for retirees and estimate your annual premium. Next, estimate the taxes you’ll owe on investment withdrawals or dividends in retirement.

• For example, in Germany, voluntary public health insurance for retirees can cost €200–€900/month (2026 estimate: €3,600–€10,800/year).
• In Portugal, private health plans for expats average €1,200–€2,400/year.
• Estimate your investment tax rate: e.g., 26.375% on capital gains in Italy, 30% in Sweden, 25% in Spain. Check if your country offers tax-free allowances or special regimes for retirees.

Add these costs to your adjusted annual spending. For example:
€32,960 (spending) + €2,000 (health) + €3,000 (taxes) = €37,960/year

Why it matters: Health care and taxes are major, variable expenses in European retirement. Missing them can leave your FIRE plan dangerously underfunded.

What can go wrong: Assuming health insurance is “free” or that your investment income won’t be taxed. Always check the latest rules and, if in doubt, overestimate.

Step 4: Apply a Safe Withdrawal Rate (SWR) Based on European Data

What to do: Divide your total annual need (from Step 3) by your chosen Safe Withdrawal Rate. The traditional US “4% rule” may be too optimistic for Europe, given lower historical equity returns and higher taxes in some countries.

• Conservative: Use a 3.25% or 3.5% SWR for most Western European countries.
• Standard: Use 4% only if you expect long bull markets, low taxes, and have a flexible budget.

FIRE number formula:
FIRE Number = Annual Need ÷ SWR

Example: With €37,960 annual need and 3.5% SWR:
€37,960 ÷ 0.035 = €1,084,571

Why it matters: Using an overly optimistic SWR can drain your portfolio too quickly, especially with sequence-of-returns risk or tax drag.

What can go wrong: Blindly using the 4% rule without adjusting for your country’s market history, taxes, or your own risk tolerance.

Step 5: Optimize for Your Country and Scenario (Conservative vs. Aggressive)

What to do: Test your FIRE number under both conservative and aggressive scenarios:

• Conservative: Higher inflation (4–5%), lower SWR (3–3.25%), higher health and tax costs, minimal government pension.
• Aggressive: Lower inflation (2%), higher SWR (4%), lower health/tax costs, expecting partial state pension or geoarbitrage.

Use calculators like:

• Nomad List (for city-specific costs in EUR)
• FIRECalc.eu (EU-focused withdrawal simulations)
• Our FIRE calculator roundup for more options

Plug your numbers into these tools and review the output. For example, if moving to Lisbon drops your annual need to €28,000 and you’re comfortable with a 3.5% SWR:

€28,000 ÷ 0.035 = €800,000

Why it matters: Scenario planning helps you avoid “one number” thinking and prepares you for market, policy, or personal changes.

What can go wrong: Only calculating one scenario and being blindsided by higher-than-expected costs or lower-than-expected returns.

Step 6: Plan Your Investment Path (Broker, Asset Mix, Rebalancing)

What to do: Once you have your FIRE number, create a plan to reach it. Decide on your asset mix (e.g., 70% global stocks via accumulating ETFs, 30% bonds or cash), choose a broker, and set up automated investing.

• For example, on Trade Republic:
  • Tap Portfolio → Savings Plan → Select ETF (e.g., iShares Core MSCI World UCITS ETF, EUR-accumulating)
  • Set monthly investment amount (e.g., €800/month)
  • Confirm and track progress toward your FIRE number
• For Degiro or Scalable Capital, follow their respective guides for setting up recurring ETF purchases.

Why it matters: A solid investment plan ensures you’re not only aiming for the right number, but actually progressing toward it.

What can go wrong: Choosing accumulating ETFs for tax efficiency in some countries (like Germany or Austria), but distributing ETFs in others where they’re more tax-favoured. Always check your country’s tax treatment of ETFs.

Common Mistakes When Calculating Your FIRE Number in Europe

• Ignoring country-specific taxes and health insurance: These can easily add 10–30% to your required portfolio size.
• Relying on outdated or US-centric withdrawal rates: Always use European data and err on the side of caution.
• Forgetting to update for actual inflation: Review and adjust your number annually based on real inflation, not just projections.
• Overlooking irregular or lifestyle expenses: Budget for at least one “unexpected” event per year.
• Assuming static circumstances: Life, policy, and markets change. Build flexibility into your plan and recalculate regularly.

Next Steps

• Read our deeper dive: How to Set Your First FIRE Number as a European
• Compare asset strategies: Index Investing vs. Dividend Growth for European FIRE
• If you’re starting late, see: Is It Too Late to Start FIRE Over 40?
• Ready to invest a lump sum? See: How to Invest a €10,000 Windfall
• For a broader strategy, revisit our 2026 Guide to Building a Portfolio for European FIRE Seekers.

Disclaimer: This article is for educational purposes only and does not constitute financial advice. Always do your own research and consider consulting a qualified financial advisor before making investment decisions.