How to Calculate the True Cost of Retiring Abroad vs. the US

Key Takeaways

A retired couple spending $7,000/month in the US can often replicate that lifestyle in Portugal or Mexico for $3,200 to $3,800/month, cutting their 30-year portfolio requirement by over $1.1 million.
The most common mistake: projecting foreign costs using US inflation rates. Inflation in your destination country can diverge by 3 to 5 percentage points, distorting your 20-year forecast by six figures.
Build two separate models, one in USD and one in local currency, then stress-test both against exchange rate shifts of plus or minus 20%.
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The Core Problem With Most Abroad Retirement Calculations

Retirement planners default to one number: your monthly spend. They multiply it by 12, divide by 0.04 for the safe withdrawal rate, and hand you a portfolio target. That process works well enough for US-based retirement. It breaks down the moment you cross a border.

Retiring abroad introduces four variables that a single monthly spend number cannot capture. Currency exchange rates move. Local inflation differs from US CPI. Tax treaties vary by country. And your healthcare cost structure changes entirely. Miss any one of these, and your projection is off by more than you think.

The correct approach builds two parallel models. The first stays denominated in USD and tracks your US-sourced income, Social Security, 401(k) and IRA withdrawals, and US-held assets. The second model runs in local currency and tracks your actual in-country spending. You then connect them at the exchange rate, and you stress-test that connection.

Step 1: Establish Your Real US Baseline

Before comparing abroad options, you need a defensible US number. Not a guess. A line-item monthly budget that reflects your actual post-retirement spending at age 65 or whenever you plan to stop working.

Use the Bureau of Labor Statistics Consumer Expenditure Survey as a starting point. The 2023 data shows average annual expenditures for households headed by someone 65 to 74 at $57,818, or roughly $4,818 per month. That covers housing, food, transportation, healthcare, and discretionary spending.

If you currently earn more and spend more, your number will be higher. A household with a $120,000 pre-retirement income typically targets $84,000 to $96,000 annually in retirement, or $7,000 to $8,000 per month, using an 80% income replacement ratio. That is the figure we will use in the examples below.

Write down your baseline: $7,000/month in the US, or $84,000/year.

Step 2: Build the Local-Currency Budget for Your Target Country

This step is where most calculations fail. People search "cost of living in Lisbon" and take a single number at face value. The correct method is to reconstruct your spending category by category using local data.

The four largest categories to re-price are housing, healthcare, food, and transportation. Entertainment, utilities, and personal care usually scale proportionally once you set the big four.

Worked Example: Lisbon, Portugal

A two-bedroom apartment in a walkable Lisbon neighborhood (Principe Real, Estrela, Campo de Ourique) runs EUR 1,400 to EUR 1,800 per month unfurnished as of mid-2025 data. Take EUR 1,600 as the midpoint.

Private health insurance for two Americans aged 65 in Portugal averages EUR 350 to EUR 500 per month for solid international coverage, compared to $900 to $1,400 per month for a Medicare Advantage plan plus supplemental in the US. Use EUR 420.

Monthly groceries for two, shopping at Pingo Doce and Continente rather than expat-priced shops, run EUR 500 to EUR 650. Use EUR 580.

Transportation without a car, Metro passes plus occasional taxis and short-haul rail, runs EUR 120 per month for two people.

Dining out, entertainment, and discretionary spending: EUR 700 per month.

Total: EUR 3,420 per month.

At a EUR/USD rate of 1.09 (the approximate 2025 average), that converts to $3,728 per month, against your US baseline of $7,000. The savings are $3,272 per month, or $39,264 per year.

Over a 30-year retirement at a 4% safe withdrawal rate, that difference implies a portfolio requirement gap of $981,000. Your Portugal retirement requires roughly $1.12 million in savings. Your US retirement requires roughly $2.10 million. Same lifestyle. Nearly $1 million less in required assets.

Worked Example: Merida, Mexico

Merida in the Yucatan is a mid-size city with a growing US expat population, good private healthcare, and significantly lower costs than coastal Mexican destinations.

A two-bedroom apartment in a central colonia runs MXN 14,000 to MXN 18,000 per month. Use MXN 16,000, or roughly $940 at a 17:1 USD/MXN exchange rate.

Private health insurance for two Americans aged 65 through a Mexican insurer or international plan: $480 per month. Mexico's private healthcare costs run 70 to 80% below comparable US procedures.

Monthly groceries at local markets and supermarkets: $380.

Transportation, primarily a car given Merida's layout, including fuel, insurance, and maintenance: $320 per month.

Discretionary and dining: $500 per month.

Total: approximately $2,620 per month.

Versus $7,000 in the US, that is a $4,380 monthly gap. Annualized: $52,560. At a 4% withdrawal rate, the portfolio target drops by $1,314,000 compared to a US-based retirement. A $790,000 portfolio covers a 30-year Merida retirement at this spend level. A $2.10 million portfolio is what the US version demands.

Step 3: Apply Country-Specific Inflation, Not US CPI

This is the error that compounds quietly for years before becoming a crisis.

US CPI averaged 3.4% in 2023 and 2.9% in 2024. Portugal's inflation averaged 4.3% in 2023. Mexico's averaged 5.5% in 2023. Those differentials matter enormously over a 20 or 30-year horizon.

Use this formula to project future monthly costs in local terms:

Future Cost = Present Cost x (1 + Local Inflation Rate) ^ Years

For Merida at $2,620/month today, using Mexico's 5-year average inflation of 5.1%:

Year 10: $2,620 x (1.051)^10 = $4,318/month Year 20: $2,620 x (1.051)^20 = $7,116/month

By year 20, your Merida cost base approaches your original US baseline, measured in today's dollars. The advantage narrows. It does not disappear, but you cannot assume a static $4,380 monthly saving for three decades.

Your model needs a year-by-year inflation projection in local currency terms, then conversion back to USD at an assumed exchange rate. The CalcMoney retirement calculator handles this adjustment automatically when you input a destination-specific inflation figure.

Step 4: Model Currency Risk Explicitly

Exchange rate risk is the variable most expatriate retirees underestimate. If you withdraw from a USD-denominated portfolio and spend in local currency, every move in the exchange rate changes your effective purchasing power.

The Mexican peso lost approximately 15% against the dollar between early 2024 and mid-2025. For a retiree spending $2,620/month in peso-equivalent terms, that shift increased their effective USD withdrawal need by $393 per month, or $4,716 per year. Over five years of similar currency pressure, the compounding effect is material.

Run three scenarios for any abroad retirement model.

Base case: Exchange rate holds at the current level for the projection period.

Bear case: Local currency strengthens by 20% against USD. Your USD purchasing power in-country drops by the same proportion. A $2,620/month budget now costs $3,144/month in USD terms.

Bull case: Local currency weakens 20% against USD. Your in-country purchasing power increases. The $2,620/month budget costs $2,096/month in USD terms.

The spread between bear and bull case in monthly USD terms is $1,048. Annualized: $12,576. Over 25 years at a 4% withdrawal rate, it implies a portfolio swing of $314,400. Currency risk is not a footnote. It is a six-figure variable.

Step 5: Account for Tax and Legal Structure

Two factors most retirees ignore until they face a tax bill they did not project.

First, the US taxes citizens on worldwide income regardless of residence. Your Social Security, IRA distributions, and investment income remain reportable to the IRS. You will also likely owe taxes to your destination country on income sourced there, unless a tax treaty provides relief. The US-Portugal tax treaty, for example, generally prevents double taxation on Social Security benefits. The US-Mexico treaty has similar provisions for pensions. Confirm treaty coverage with a tax attorney who specializes in expatriate taxation before you commit.

Second, the Foreign Earned Income Exclusion applies only to earned income, not retirement distributions. Retirees often misapply this and underproject their US tax liability.

Budget $1,500 to $3,000 per year for ongoing expatriate tax preparation. It is not optional. Noncompliance penalties under FBAR and FATCA rules for unreported foreign accounts start at $10,000 per violation.

Run Both Models Before You Commit

The decision to retire abroad carries real financial upside. It also carries real complexity. The difference between a well-modeled decision and a poorly modeled one is often $500,000 or more in required portfolio assets.

The correct sequence is: establish your US baseline, rebuild your budget line by line in local currency, apply destination inflation rather than US CPI, stress-test for currency movement, and confirm your tax treaty position.

The CalcMoney retirement calculator lets you input a custom monthly spend, a custom inflation rate, and a target time horizon. You can run your US scenario, then run your abroad scenario with destination-specific inputs, and compare the required portfolio figures side by side.

That comparison is the decision. Run it with your actual numbers.

Calculate your US vs. abroad retirement cost now →

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