How to Calculate Your Geographic Arbitrage Number

Your geographic arbitrage number is the monthly cost difference between where you currently live and where you could live on the same income, expressed as additional monthly savings. Calculating it requires four inputs: your current monthly take-home income, your current monthly expenses, your projected monthly expenses in the target location, and your one-time transition costs. Once you have those four numbers, the calculation tells you exactly how long it takes to recoup the transition cost and what your new savings trajectory looks like from there.

This guide walks through the full calculation with a real example, covers the variables most people miss, and shows you how to use the number to compare multiple locations before committing to any of them.

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Why “It’s Cheaper There” Is Not a Calculation

Most people approach geo-arbitrage with a vague sense that living abroad is cheaper, and they are right. But vague is not useful. Without a specific number, you cannot make a rational decision about whether the move makes financial sense for your situation, when you would break even on transition costs, or which of several target locations produces the best outcome.

The geographic arbitrage number turns a lifestyle conversation into a financial one. And when it is a financial conversation, you can compare options the same way you would compare any investment: by the return it produces relative to the cost and risk. The Geo-Arbitrage Income Calculator gives you a pre-built tool to run this comparison across the major Southeast Asian cities without building the spreadsheet from scratch.

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The Four Inputs You Need

Before you run any calculation, you need four numbers.

Input 1: Monthly take-home income (after tax)

This is your actual deposited income, not your gross salary. If you earn $80,000 per year in Texas with no state income tax and standard federal deductions as a single filer, your take-home is roughly $5,200 to $5,400 per month. Use a paycheck calculator or average your actual bank deposits over the last three months.

Your income figure stays the same in both scenarios. The entire point of geo-arbitrage is that your income does not change. Only your expenses do.

Input 2: Current monthly expenses (fully loaded)

Most people underestimate this figure. Do not use your budget. Use your actual spending. Pull three months of bank and credit card statements and categorize everything. Include rent or mortgage plus utilities, groceries and eating out, transport (car payment, insurance, gas, parking, or transit), health insurance and out-of-pocket medical, subscriptions and software, entertainment and social spending, clothing and personal care, and all debt payments.

Add a 10% buffer for irregular expenses like car repairs, medical surprises, and one-off purchases. This is your true monthly burn rate.

Input 3: Projected monthly expenses in the target location

This requires research, not assumptions. The most reliable sources are Numbeo (numbeo.com) for a crowd-sourced baseline, Expatistan (expatistan.com) for a cross-check with a different methodology, expat Facebook groups and forums for real numbers from actual residents, and rental listing sites like Lamudi (Philippines), DDproperty (Thailand), and Batdongsan (Vietnam) for housing costs specifically.

Build a line-item budget for the target location using the same categories as your current expenses. Do not assume categories disappear. Entertainment, eating out, and social costs exist everywhere. They just cost different amounts.

Input 4: One-time transition costs

This is the number most geo-arbitrage calculations skip. It is real and it matters for the break-even analysis.

Cost Item	Typical Range
Flights (one-way or return)	$800–$2,500
Visa fees and processing	$100–$500
First month + deposit on apartment	2–3x monthly rent
Shipping or storage of belongings	$500–$3,000
Health check and medical requirements	$100–$400
Travel insurance during transition	$100–$300
Buffer for unexpected setup costs	$1,000–$2,000
Total typical range	$4,000–$12,000

This is a one-time cost, not a recurring one. The break-even calculation tells you how long it takes to recover it from the monthly savings differential.

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The Geographic Arbitrage Formula

Once you have the four inputs, the calculation runs in five steps.

Step 1: Calculate your current monthly savings

Current Monthly Savings = Monthly Take-Home − Current Monthly Expenses

Step 2: Calculate your projected monthly savings in the target location

Projected Monthly Savings = Monthly Take-Home − Target Location Monthly Expenses

Step 3: Calculate the monthly arbitrage gain

Monthly Arbitrage Gain = Projected Monthly Savings − Current Monthly Savings

Step 4: Calculate break-even on transition costs

Break-Even (months) = Total Transition Costs ÷ Monthly Arbitrage Gain

Step 5: Calculate 5-year savings differential

5-Year Differential = Monthly Arbitrage Gain × 60 months

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A Worked Example: $75,000 Remote Salary, Austin to Manila

Inputs:

• Monthly take-home (single filer, $75K gross, no state tax): $5,000
• Current monthly expenses in Austin: $4,000
• Projected monthly expenses in Manila (BGC area): $1,500
• One-time transition costs: $7,000

Step 1: Current monthly savings $5,000 minus $4,000 = $1,000 per month

Step 2: Projected monthly savings in Manila $5,000 minus $1,500 = $3,500 per month

Step 3: Monthly arbitrage gain $3,500 minus $1,000 = $2,500 per month in additional savings

Step 4: Break-even on transition costs $7,000 divided by $2,500 = 2.8 months

Under three months to fully recover every dollar spent on the move.

Step 5: Five-year savings differential $2,500 multiplied by 60 = $150,000 in additional savings over five years

That is $150,000 more saved on the exact same income before any investment returns. The geographic arbitrage number for this scenario is $2,500 per month with a break-even of under three months.

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The Variables Most People Miss

Running this calculation once gives you a number. Running it correctly means accounting for the variables that shift the outcome significantly.

Variable 1: Tax residency and the Foreign Earned Income Exclusion

US citizens living abroad may qualify for the Foreign Earned Income Exclusion (FEIE), which allows you to exclude up to $126,500 of foreign-earned income from US federal taxes in 2024.[1] If your income qualifies, this changes your take-home meaningfully, potentially adding $800 to $2,000 per month to the income side of the calculation.

This is complex and requires a tax professional who specializes in expat taxation. It is not automatic and not available to everyone. But it is a variable that can dramatically improve the geo-arbitrage math, and most introductory articles do not mention it.

Variable 2: Inflation in the target location

The Philippines, Thailand, and Vietnam have all experienced meaningful inflation over the past three years, compressing some of the cost advantage relative to 2021 data. Build a 5 to 10% annual inflation buffer into your target location expense projections. Do not assume today’s costs are static over a five-year horizon.

Variable 3: Lifestyle inflation in the target location

The most common mistake first-time geo-arbitrage practitioners make is spending like a local on some things while spending like a tourist on others. Eating at Western restaurants four nights a week, traveling regionally every month, and furnishing a premium apartment will compress your savings significantly. Your projection should reflect your actual intended lifestyle, not an optimistic version of it.

Variable 4: Healthcare and insurance gaps

Your US health insurance likely does not cover you abroad, or covers only emergency care. Budget for private health insurance in the target country. In the Philippines this runs $50 to $150 per month for comprehensive private coverage, which is genuinely cheap but needs to be in the calculation.

Variable 5: Return trips home

If you plan to visit family or the US twice a year, factor in $2,000 to $4,000 per year in flights. This compresses the monthly arbitrage gain by $170 to $330 per month. The math is still compelling in most Southeast Asia scenarios, but the honest number includes it.