How much income do you actually need to retire abroad?
10th July 2026
It is one of the most common questions in international financial planning, and one of the most poorly answered.
"How much do I need to retire?" is a question that financial media reduces to a rule of thumb - usually a multiple of your final salary, or a total pot size, delivered with the confidence of someone who has never actually sat down with a client and tried to make the numbers work. The reality for a British expat retiring abroad is significantly more complex, and the standard answers do not apply.
This piece is for people who are either approaching retirement outside the UK or are already living abroad and have not done the detailed work yet. It covers what the numbers actually need to look like, why the inputs differ from a UK-based calculation, and where the most common planning errors occur.
"How much do I need to retire?" is a question that financial media reduces to a rule of thumb - usually a multiple of your final salary, or a total pot size, delivered with the confidence of someone who has never actually sat down with a client and tried to make the numbers work. The reality for a British expat retiring abroad is significantly more complex, and the standard answers do not apply.
This piece is for people who are either approaching retirement outside the UK or are already living abroad and have not done the detailed work yet. It covers what the numbers actually need to look like, why the inputs differ from a UK-based calculation, and where the most common planning errors occur.
The 4% rule and why it does not translate directly
The 4% rule is the starting point for almost every retirement income conversation. It comes from the Trinity Study, first published in 1998 and updated several times since, which found that a retiree drawing 4% of their portfolio in year one, then increasing withdrawals with inflation each year, would have had a very high probability of not running out of money over a 30-year retirement, based on US market history.
The logic is sound, but the inputs matter enormously.
The original research used US equity and bond market returns, in US dollars, for a US-based retiree spending in US dollars. A British expat retiring in Thailand, drawing income in sterling from a portfolio denominated in US dollars and euros, spending in Thai baht, with a state pension that may or may not increase each year depending on where they live, is a fundamentally different calculation.
There are three specific adjustments that matter.
First, sequence of returns risk is amplified for expat retirees who cannot easily reduce costs in a downturn. If markets fall 30% in year two of your retirement and your withdrawals are fixed, the damage to the long-term portfolio is much more severe than the theoretical model assumes.
Second, the research used 30-year time horizons. If you retire at 55 or 60, which is common among the senior professionals and business owners Brigantia works with, you may be planning for 35 or 40 years. The probability of portfolio survival falls as the time horizon extends. At 40 years, a 4% withdrawal rate carried a meaningful failure rate even in the historical data.
Third, inflation assumptions differ. The original research used US CPI. If your costs are partly driven by Thai baht, Singapore dollar, or UAE dirham inflation, and partly by the cost of imported goods and services, your personal inflation rate may diverge significantly from any single national index. That's without even factoring in that the official CPI figures don't actually measure the real rising cost of living!
A more cautious planning rate of 3% to 3.5% is often more appropriate for expat retirees with long time horizons. This is not pessimism - it is the rate that gives a cashflow plan genuine resilience across a wide range of scenarios.
The 4% rule is the starting point for almost every retirement income conversation. It comes from the Trinity Study, first published in 1998 and updated several times since, which found that a retiree drawing 4% of their portfolio in year one, then increasing withdrawals with inflation each year, would have had a very high probability of not running out of money over a 30-year retirement, based on US market history.
The logic is sound, but the inputs matter enormously.
The original research used US equity and bond market returns, in US dollars, for a US-based retiree spending in US dollars. A British expat retiring in Thailand, drawing income in sterling from a portfolio denominated in US dollars and euros, spending in Thai baht, with a state pension that may or may not increase each year depending on where they live, is a fundamentally different calculation.
There are three specific adjustments that matter.
First, sequence of returns risk is amplified for expat retirees who cannot easily reduce costs in a downturn. If markets fall 30% in year two of your retirement and your withdrawals are fixed, the damage to the long-term portfolio is much more severe than the theoretical model assumes.
Second, the research used 30-year time horizons. If you retire at 55 or 60, which is common among the senior professionals and business owners Brigantia works with, you may be planning for 35 or 40 years. The probability of portfolio survival falls as the time horizon extends. At 40 years, a 4% withdrawal rate carried a meaningful failure rate even in the historical data.
Third, inflation assumptions differ. The original research used US CPI. If your costs are partly driven by Thai baht, Singapore dollar, or UAE dirham inflation, and partly by the cost of imported goods and services, your personal inflation rate may diverge significantly from any single national index. That's without even factoring in that the official CPI figures don't actually measure the real rising cost of living!
A more cautious planning rate of 3% to 3.5% is often more appropriate for expat retirees with long time horizons. This is not pessimism - it is the rate that gives a cashflow plan genuine resilience across a wide range of scenarios.
Currency risk is a retirement income problem, not just an investment problem
Most people think about currency risk as something that affects their portfolio. In retirement, it is more accurately described as an income problem.
Consider a retiree with a portfolio denominated in sterling who has moved to Thailand. Their costs are in baht. Over a 20-year retirement, the GBP/THB exchange rate will move, repeatedly and materially. The Thai baht has strengthened against sterling at various points over the past two decades. The same portfolio, measured in baht spending power, can look very different depending on which decade you happen to be in.
This is before considering the pound's performance against the dollar, which has historically driven portfolio returns for expat investors with USD-denominated holdings.
The practical planning response involves two things. The first is building a currency buffer - typically 12 to 18 months of living costs held in local currency or a stable international currency, so that you are not forced to sell portfolio assets during an unfavourable exchange rate period to meet monthly costs. The second is structuring the portfolio so that currency exposure is deliberate and understood, not accidental.
The worst outcome is an all-sterling portfolio with all-baht spending, no buffer, and no plan for the exchange rate to move against you. This is more common than it should be.
What the income number actually needs to cover
Before building a retirement income target, it is worth going through what the number needs to cover in practice. Most expats underestimate at least one of the following categories.
Healthcare. International private medical insurance for a couple in their mid-60s is not cheap. A comprehensive plan with no territorial exclusions, covering chronic conditions, cancer, and inpatient care at a reputable hospital, will cost somewhere in the range of £8,000 to £15,000 per year depending on age, health history, and plan structure. This number rises materially as you age. It needs to be treated as a fixed cost in the cashflow model, not an afterthought.
The state pension shortfall. If you live in Thailand, the UK state pension does not increase with inflation. You receive the rate at which you first claimed, frozen for the rest of your life. The average frozen state pension shortfall for a British expat compared to a pensioner living in the UK is currently around £7,000 per year, and that gap widens every year as the triple lock increases UK-based payments. If your plan assumed a rising state pension and you are in a frozen country, the numbers need revisiting.
Emergency and one-off costs. A return to the UK for medical treatment, a family emergency, a significant home repair in whichever country you are based in - these are not genuinely unpredictable in aggregate. A retirement plan that has no slack for irregular large costs will fail when they arise. A common approach is to build a separate reserve of one to two years' living costs that is not part of the investment portfolio, held in liquid assets and replenished when drawn down.
Long-term care. This is the planning conversation nobody wants to have and almost everyone eventually needs. The probability of needing some form of care or support in later life is high. For expats, the question of where that care will be provided adds another layer of complexity. Returning to the UK is one option, but UK care costs are substantial and access to state provision for returning expats is subject to residency and means testing. Provision in Thailand or elsewhere may be more affordable but requires forward planning. This cost should appear somewhere in the cashflow model, even if the timing and quantum are uncertain.
Most people think about currency risk as something that affects their portfolio. In retirement, it is more accurately described as an income problem.
Consider a retiree with a portfolio denominated in sterling who has moved to Thailand. Their costs are in baht. Over a 20-year retirement, the GBP/THB exchange rate will move, repeatedly and materially. The Thai baht has strengthened against sterling at various points over the past two decades. The same portfolio, measured in baht spending power, can look very different depending on which decade you happen to be in.
This is before considering the pound's performance against the dollar, which has historically driven portfolio returns for expat investors with USD-denominated holdings.
The practical planning response involves two things. The first is building a currency buffer - typically 12 to 18 months of living costs held in local currency or a stable international currency, so that you are not forced to sell portfolio assets during an unfavourable exchange rate period to meet monthly costs. The second is structuring the portfolio so that currency exposure is deliberate and understood, not accidental.
The worst outcome is an all-sterling portfolio with all-baht spending, no buffer, and no plan for the exchange rate to move against you. This is more common than it should be.
What the income number actually needs to cover
Before building a retirement income target, it is worth going through what the number needs to cover in practice. Most expats underestimate at least one of the following categories.
Healthcare. International private medical insurance for a couple in their mid-60s is not cheap. A comprehensive plan with no territorial exclusions, covering chronic conditions, cancer, and inpatient care at a reputable hospital, will cost somewhere in the range of £8,000 to £15,000 per year depending on age, health history, and plan structure. This number rises materially as you age. It needs to be treated as a fixed cost in the cashflow model, not an afterthought.
The state pension shortfall. If you live in Thailand, the UK state pension does not increase with inflation. You receive the rate at which you first claimed, frozen for the rest of your life. The average frozen state pension shortfall for a British expat compared to a pensioner living in the UK is currently around £7,000 per year, and that gap widens every year as the triple lock increases UK-based payments. If your plan assumed a rising state pension and you are in a frozen country, the numbers need revisiting.
Emergency and one-off costs. A return to the UK for medical treatment, a family emergency, a significant home repair in whichever country you are based in - these are not genuinely unpredictable in aggregate. A retirement plan that has no slack for irregular large costs will fail when they arise. A common approach is to build a separate reserve of one to two years' living costs that is not part of the investment portfolio, held in liquid assets and replenished when drawn down.
Long-term care. This is the planning conversation nobody wants to have and almost everyone eventually needs. The probability of needing some form of care or support in later life is high. For expats, the question of where that care will be provided adds another layer of complexity. Returning to the UK is one option, but UK care costs are substantial and access to state provision for returning expats is subject to residency and means testing. Provision in Thailand or elsewhere may be more affordable but requires forward planning. This cost should appear somewhere in the cashflow model, even if the timing and quantum are uncertain.
The cost of getting this wrong
Retirement planning errors are expensive to fix, and they become more expensive the later they are caught. A plan built on an income estimate that is 20% too low does not produce a gentle course correction - it produces a choice between reducing living standards, returning to work, or drawing down capital faster than the portfolio can sustain.
For British expats, the risk is amplified by several factors that domestic retirees do not face. The frozen state pension. Currency exposure. International healthcare costs. The complexity of pension vehicles and whether the right structure is in place to provide efficient income in your country of residence.
None of this is insurmountable with proper planning. But it does require more rigour than the standard retirement calculators provide.
You can book an initial call below.
Retirement planning errors are expensive to fix, and they become more expensive the later they are caught. A plan built on an income estimate that is 20% too low does not produce a gentle course correction - it produces a choice between reducing living standards, returning to work, or drawing down capital faster than the portfolio can sustain.
For British expats, the risk is amplified by several factors that domestic retirees do not face. The frozen state pension. Currency exposure. International healthcare costs. The complexity of pension vehicles and whether the right structure is in place to provide efficient income in your country of residence.
None of this is insurmountable with proper planning. But it does require more rigour than the standard retirement calculators provide.
You can book an initial call below.
