Introduction

Most retirement calculators assume one country, one tax system and one currency. If your life does not fit that template, this article explains what to do instead.

We will show the three residency scenarios we model as standard for cross-border clients, and why the exercise matters even if the decision is fifteen years away.

Retirement planning tools ask for one currency, one tax regime and one inflation rate. Internationally mobile people have none of those things fixed, which is why the resulting number feels arbitrary.

The variables that move the answer most are not investment returns. They are the tax treatment of your withdrawals, the healthcare cost you carry personally, and the currency your spending is denominated in.

Three scenarios we model as standard

• Remain in the current jurisdiction: lowest disruption, but often the highest ongoing cost base and the least favourable withdrawal treatment.
• Return to the country of origin: family support improves the picture, currency exposure usually worsens it, and pension portability becomes the binding constraint.
• Third-country retirement: frequently the lowest cost of living, but it introduces healthcare self-funding and estate exposure that must be priced in, not assumed away.

Why we model rather than assume

The point of running all three is not to pick one now. It is to find out how sensitive your plan is to a decision you may not make for fifteen years.

A plan that only works in one scenario is not a plan. It is a preference with a spreadsheet attached.

Optionality has a price. Knowing the price is what lets you decide whether to pay it.

What changes in the plan

Where residency is genuinely undecided, we bias towards portable structures, liquid assets and documentation that survives a move — even at a modest cost to headline efficiency.

That trade is explicit and written down, so you can revisit it when the decision firms up rather than discovering it by accident.