FIRE

Coast FIRE Abroad: Does Geoarbitrage Change the Math?

By Michael Ashmore  ·  13 Aug 2026  ·  7 min read
A latte and laptop on a wooden cafe table
Barista FIRE, literally — part-time work covering part of the target, a smaller portfolio covering the rest. Photo: Roland Denes / Unsplash

About the author: Michael Ashmore is a British expat in the US who built RetireFlexi after discovering that no retirement calculator could handle pensions in two countries at once. He writes about the financial side of expat retirement that most guides skip.

Yes, it changes the math — Coast FIRE is calculated backward from your eventual spending target, and moving somewhere your spending drops by a third pulls that target down by roughly the same amount. What it doesn't change is the part people skip: whether the lower cost of living is a real, sustained number or a guess based on a vacation.

The mechanics, quickly

Coast FIRE is the portfolio size at which, if you stopped contributing today, compound growth alone would carry it to your full retirement number by a traditional retirement age. Hit that number, and you can stop saving — cover current expenses from current income, let the existing portfolio do the rest silently in the background.

Barista FIRE is a step further into actual early retirement: part-time or lower-stress work covers some of your living costs, and a smaller portfolio than full FIRE would require covers the remainder. Both are the same underlying formula — future spending target, divided by a safe withdrawal rate, discounted back to today's portfolio requirement — just landing on different combinations of "how much is covered by work" and "how much is covered by the portfolio."

A worked example

Someone targeting $50,000 a year in retirement, at a 4% withdrawal rate, needs a $1.25 million portfolio. Move that same lifestyle somewhere spending drops to $32,000 a year — not unrealistic for several popular retirement destinations — and the target portfolio drops to $800,000. That's the geoarbitrage effect on Coast FIRE, direct and real: less needed, sooner reachable.

The $32,000 has to be a real number, not a hope. A two-week trip prices restaurants and hotels, not the actual cost of a rented apartment, health insurance, and groceries over a full year of living somewhere. The gap between "feels cheap on vacation" and "is actually cheap to live" is where geoarbitrage plans go wrong most often.

What doesn't show up in a cost-of-living index

Four things routinely eat into the savings a lower cost of living promises. Currency risk, first — a multi-decade retirement drawing income in one currency while spending in another means exchange rate movement is a real, uncontrolled variable, not a rounding error. Healthcare, second — cost and quality vary enormously by country, and what looks like a savings line item can turn into a genuine gap in coverage. Visa renewal requirements, third — rules change, and a plan built around a visa category that gets tightened is a plan that needs a backup. And the actual cost of staying connected to home — flights, visits, the version of "cheap" that assumes you never fly back — which a Numbeo cost index doesn't price in at all.

None of these make geoarbitrage a bad idea. They make "just move somewhere cheaper" an incomplete plan without the specific numbers behind it.

Where the real numbers live

The 2021 vs 2026 cost-of-living comparison tracks Numbeo index data across a dozen-plus popular retirement destinations — several of which moved by 20% or more in just five years, in both directions. That's the input a Coast FIRE recalculation actually needs, not a guess.

Run your actual Coast FIRE number, two ways

Set a domestic income target as Scenario A, a lower geoarbitrage target as Scenario B, and see the portfolio-size gap directly.

✦ Open the FIRE Abroad Calculator — it's free
Not financial advice. This article is for general information only. Cost of living, currency movement, healthcare access, and visa requirements vary by country and change over time — verify current figures independently and consult a qualified financial adviser before making early-retirement decisions.