Retiring Abroad: Cutting Costs for FIRE

Moving somewhere with a lower cost of living — often called geographic arbitrage — is one of the most direct levers in FIRE planning, because of how the maths actually works, not just because life feels more relaxed somewhere warmer.

As always: this is general information, not personal tax or immigration advice. Visa rules, tax treaties, and pension policy are genuinely complex, differ by country, and change — a regulated financial adviser and, ideally, an immigration specialist for your target country are worth the cost once you're seriously planning a move.

The maths: why cutting spend is the biggest lever there is

The FIRE Number Calculator's quick target is a simple formula: annual spending divided by your withdrawal rate. Because spending sits on top of that fraction, cutting it has a direct, proportional effect on the pot you need — reduce your annual spend by 40%, and (debt aside) your target number drops by roughly the same 40%, not some smaller knock-on amount. That's a bigger single lever than most people find anywhere else in their plan, which is exactly why geographic arbitrage comes up so often in FIRE communities.

You need a visa — post-Brexit, this isn't automatic anymore

UK citizens lost automatic freedom of movement across the EU after Brexit. Moving to most popular destinations now means qualifying for a specific visa, usually by proving a minimum level of passive income — which is itself a smaller, country-specific version of your FIRE number.

Two examples show how different that bar can be:

• Portugal's D7 visa requires proof of passive income of roughly €920 a month (about €11,040 a year) as of 2026 — one of the more accessible thresholds among popular destinations, and it allows you to work or freelance locally after you arrive.
• Spain's Non-Lucrative Visa requires a considerably higher roughly €2,400–€2,620 a month for a single applicant, and — as the name suggests — doesn't allow you to work in Spain at all.

Worth flagging directly: Portugal's well-known NHR tax scheme, which used to offer large income tax breaks to new residents including on foreign pension income, closed to new applicants on 1 January 2024, with the transition window for late qualifiers closing 31 March 2025. It's been replaced by IFICI, a much narrower scheme aimed at specific research, scientific, and innovation roles — not something most people retiring early can access. A lot of older "retire in Portugal" content online still references NHR as if it's available to anyone moving there; as of 2026, it isn't.

The State Pension freezing trap

This is the detail that catches people out, because it isn't about your own savings at all — it's about what happens to your State Pension specifically.

If you retire to a country in the EU or EEA, or Switzerland, your UK State Pension continues to receive the same annual uprating (the "triple lock") as if you'd stayed in the UK. The same is true for a short list of other countries with bilateral social security agreements with the UK, including the USA, Israel, Jamaica, and Barbados among others.

Retire almost anywhere else, though, and your State Pension is frozen at whatever rate applied when you first claimed it or left the UK — permanently, with no further increases, no matter how many decades you live there. This includes hugely popular retirement destinations: Australia, Canada, South Africa, New Zealand, and Thailand are all on the frozen list. Over a couple of decades, ordinary inflation quietly erodes a frozen pension's real spending power by a large fraction — money that resident UK pensioners keep getting compensated for every year, and frozen expats simply don't.

This only affects the State Pension mechanism itself — it has nothing to do with your ISA, SIPP, or any other private savings, which remain entirely yours regardless of where you live. What does change once you move is how those are taxed: that depends on your destination country's own rules and the specific double taxation treaty it has with the UK, which is genuinely complex enough to be worth professional advice rather than a general guide.

What happens to your ISA once you move

One practical detail worth knowing in advance: once you become non-UK tax resident, you can keep any existing ISA and it stays entirely UK-tax-free for as long as you hold it, but you generally can't make new contributions into it while you remain non-resident. See ISA vs LISA vs GIA: A Plain-English Guide for how the wrapper works while you're still building it up in the UK, before any move.

Popular destinations, and where the trade-offs actually sit

Cost-of-living figures are rough averages and vary hugely by city versus rural area, and by personal lifestyle — treat them as a starting point for your own research, not a budget you can rely on directly.

A practical checklist before committing

• Confirm the actual visa route and its current minimum income or asset requirement for your specific target country — these change and are stricter than they first appear once you read the small print.
• If you're near or past State Pension age, check your destination against the current uprating list via the International Pension Centre before assuming your pension will keep rising.
• Check the UK's double taxation treaty with that country to understand how your pension and investment income will actually be taxed once you're resident there.
• Budget for private healthcare or understand the local system's rules — NHS access isn't automatic once you're no longer UK tax resident.
• If your income (State Pension, SIPP drawdown) is in GBP but your spending is in another currency, factor in currency risk — a weak pound directly shrinks your real spending power abroad.

Run your target country's realistic cost of living through the FIRE Number Calculator's spend field to see the actual effect on your target — it's usually a bigger shift than people expect before they do the maths.

Figures above were checked against GOV.UK's guidance on State Pension if you retire abroad, the Low Incomes Tax Reform Group's retiring abroad guide, and current Portugal D7 and Spain Non-Lucrative visa guidance at the time of writing — visa and tax rules change and are genuinely country-specific, so confirm current requirements directly before acting on anything here.