Calculate your path to financial independence as an internationally mobile professional. Factor in multi-country income, cross-border savings, and geographic arbitrage into your FIRE number.
FIRE Number
€1.4M
Years to FIRE
14 yr
Savings Rate
44%
Financial independence assumes a stable relationship between what you earn, what you spend and where you keep your money. Move countries every few years and all three come loose. Salary jumps and falls in real terms, your cost base resets, and your investments may sit in a jurisdiction you no longer live in. The upside is real: professionals moving between European markets often lift their savings rate sharply for a few years, and those years do disproportionate work because the money has the longest time to compound. The risk is that the same mobility fragments your pension record, leaves accounts stranded in countries you have left, and makes the tax treatment of your eventual withdrawals genuinely hard to predict.
Sources: Your Europe — income taxes abroad
Your FIRE number is annual spending divided by a withdrawal rate, but for a mobile saver both halves need thought. Spending should be modelled in the country you expect to retire in, not the one paying you now. Eurostat's comparative price levels show consumer prices across the EU differing by more than a factor of two between the cheapest and most expensive member states, so the same lifestyle produces very different targets. On the withdrawal side, many internationally mobile savers use 3.25% to 3.5% rather than 4%, because currency exposure, uncertain tax treatment and healthcare costs that are not covered by a single national system all add variance the classic rule never modelled.
Sources: Eurostat — comparative price levels
Geographic arbitrage is the headline strategy and it is usually oversold. Earning a Zurich salary while living in Lisbon is a genuine advantage, but it is also a tax-residency question, a right-to-work question and often an employer-policy question before it is a maths question. The more durable lever is the gap between a rising salary and a cost base you deliberately hold flat across moves. Each move is an opportunity to reset housing costs rather than inherit them, and housing is the largest line in nearly every expat budget. Watch the leakage too: currency conversion, cross-border transfer fees and duplicated insurance quietly consume several percent of the savings rate you think you have.
Sources: Your Europe — income taxes abroad
FIRE number = Annual spending in your retirement country ÷ Withdrawal rate
The denominator is where internationally mobile savers differ. A 4% withdrawal rate assumes a single currency, a single tax regime and predictable healthcare. Cross a border and all three move, so many mobile savers use 3.25% to 3.5% instead. The calculator projects your savings forward with compound growth and compares the result with the corpus your chosen rate requires.
Tomas earns in CHF in Zurich and plans to retire in Spain, where he expects to spend €42,000 a year. At 4% his FIRE number is €1.05m; at 3.5% it rises to €1.2m. With €180,000 invested and €4,000 a month at 6%, the more cautious rate pushes his date out by roughly two years.
Model the currency you will spend in, not the one you earn in. A portfolio in USD funding a life in euros carries a risk the 4% rule was never designed to cover.
Geographic arbitrage is real but it is not free. Residency rules, healthcare access and the tax treatment of foreign capital gains all move when you do, and each can cost more than the rent you saved.
Check whether your brokerage travels. Several EU platforms restrict or close accounts when you move residency, and a forced liquidation can crystallise gains at the worst moment.
Build the state-pension floor into the plan. Even a partial entitlement from a few countries lowers the corpus your own capital has to produce.
Re-run the number after every move. A new country changes spending, tax and often income at the same time, and the old date stops being true.
This gives you a figure for today. Wealthos tracks your real accounts across borders, converts them into your target currency, and shows the date moving as your savings rate does.
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