For most people, tax residence is something that happens to them. They live in a country. They work there. They pay tax there. For internationally mobile wealth, the relationship is increasingly the opposite. The choice of where to live can determine how an investment portfolio is taxed, and that means tax residence is becoming an investment decision.
The Old Way of Thinking
Traditionally, an investor would decide where to live for personal reasons.
Family.
Career.
Education.
Lifestyle.
Then the tax adviser would work out the consequences.
That sequence is becoming outdated.
For an entrepreneur, private-equity investor or wealthy family with substantial international assets, the tax consequences of residence can be enormous.
A change of residence can affect:
- investment income;
- capital gains;
- dividends;
- corporate structures;
- trusts;
- inheritance;
- real estate;
- private-equity investments; and
- the eventual transfer of wealth to the next generation.
The jurisdiction of residence therefore becomes part of the investment architecture.
Britain Has Made This Clear
The UK’s reforms provide perhaps the clearest example.
From 6 April 2025, the UK abolished the remittance basis for non-UK domiciled individuals and introduced a new four-year Foreign Income and Gains regime for qualifying new residents who have not been UK tax resident for the previous ten years.
At the same time, the UK moved away from the old domicile-based approach to inheritance tax.
From 6 April 2025, long-term UK residence became the relevant connecting factor for determining exposure to UK inheritance tax on overseas assets. A person can remain within the inheritance-tax net for a period after leaving the UK, depending on their previous UK residence.
This changes the calculation.
A wealthy person considering moving to Britain cannot simply ask:
What is my income tax rate?
They have to ask:
What happens to my worldwide wealth if I become resident here — and what happens if I later leave?
That is a very different question.
Residence Has a Balance Sheet
Imagine an investor with €50 million.
Perhaps €10 million is invested in listed equities.
€10 million in private equity.
€10 million in real estate.
€10 million in operating businesses.
And €10 million in cash and other investments.
The person may generate several million euros of income and gains each year.
At that level, the tax residence decision is no longer a lifestyle footnote.
It can materially affect the family’s balance sheet.
A difference of several percentage points in taxation may represent hundreds of thousands of euros.
Over ten years, millions.
Over a generation, potentially much more.
The Tax Rate Is Only the Beginning
This is why comparing headline income-tax rates is dangerous.
The sophisticated investor asks a much longer list of questions.
How are capital gains taxed?
How are dividends taxed?
What happens to foreign investment income?
Is there a wealth tax?
What happens to inherited assets?
Are foreign trusts recognised?
How are private companies treated?
What happens to carried interest?
What happens to real estate?
Are there exit taxes?
How long does tax exposure continue after departure?
What are the residence tests?
And how does the domestic regime interact with tax treaties?
The answer can be dramatically different from the headline tax rate.
Italy Understands the Product
Italy has been one of the clearest examples of a country turning tax residence into an economic proposition.
Its special regime for new residents provides a fixed annual tax charge on qualifying foreign income.
The attraction is not simply that the number may be lower than taxation under another system.
It is that the investor can calculate.
For a wealthy family, certainty can be more valuable than optimisation.
If an investor knows broadly what the annual tax cost of becoming resident will be, it becomes possible to model a ten-year investment strategy.
That is very different from operating in a system where the tax consequences of every investment have to be recalculated individually.
Portugal Has Taken Another Approach
Portugal demonstrates another model.
The country moved away from its previous broad Non-Habitual Resident regime and introduced the IFICI incentive aimed at scientific research and innovation and specified qualifying activities.
Under the regime, qualifying individuals who meet the requirements can benefit from a special 20% rate on certain Portuguese employment and self-employment income, while certain foreign-source income can receive favourable treatment under the rules.
This is important because it demonstrates the direction of travel.
Governments increasingly want tax incentives to be connected to economic activity.
The proposition is becoming:
Come here.
Work here.
Build here.
Invest here.
Innovate here.
And in return, receive a defined tax framework.
That is increasingly politically defensible.
Residence Is Becoming More Conditional
The next development is that residence itself is becoming more carefully scrutinised.
It is no longer enough for an investor to obtain a residence permit.
Residence for immigration purposes and residence for tax purposes are not necessarily the same thing.
A person can have the right to live somewhere without becoming tax resident there.
Conversely, spending substantial time in a jurisdiction can create tax consequences even when the individual did not intend to relocate permanently.
This distinction is fundamental.
Investment migration and tax migration are related.
They are not identical.
The 183-Day Myth
There is also a persistent misconception that tax residence is simply a question of spending 183 days in a country.
In reality, residence tests can be considerably more complicated.
Countries look at different combinations of days, homes, family connections, economic interests and other factors.
Tax treaties can introduce another layer.
An internationally mobile investor therefore cannot build a residence strategy around counting days alone.
The real question is:
Where is the individual’s actual centre of life and economic connection?
The Portfolio Has to Follow the Person
This is where the investment implications become interesting.
Suppose an investor is considering becoming resident in Country A rather than Country B.
The choice may influence whether it makes sense to hold an asset personally.
Perhaps an investment should instead be held through a company.
Perhaps a fund structure is more efficient.
Perhaps a private-equity investment should be made through a particular vehicle.
Perhaps an investment should be realised before moving.
Perhaps it should be retained.
Perhaps real estate should be owned directly.
Perhaps it should be held through an investment structure.
The investment decision and the residence decision become interconnected.
Private Equity Makes This More Important
Private equity is a particularly good example.
A private-equity investment may generate:
- dividends;
- interest;
- capital gains;
- carried interest;
- distributions;
- management income; or
- proceeds from a corporate exit.
The tax treatment of each can depend heavily on the investor’s residence and the structure through which the investment is held.
A family making a €10 million private-equity allocation therefore needs to understand not just the expected investment return.
It needs to understand the after-tax return from its chosen residence.
That is a different investment calculation.
Real Estate Is Similar
Real estate creates another complication.
The property may be located in one country.
The owner may be resident in another.
The investment vehicle may be established in a third.
Financing may come from a fourth.
Tax can potentially arise in several jurisdictions.
This is why wealthy investors increasingly need to think geographically.
The question is no longer simply:
What property should I buy?
It is:
Where should I live, where should I own it, and how should it be structured?
Leaving Is Also an Investment Decision
Perhaps the most important change is that investors increasingly consider the exit.
Historically, residence planning focused on arrival.
Today it also focuses on departure.
If an individual spends ten or fifteen years in a country and then leaves, what happens?
Does tax exposure continue?
Is there an inheritance-tax tail?
Is there an exit tax?
What happens to trusts?
What happens to companies?
What happens to unrealised gains?
The UK’s new inheritance-tax rules illustrate the point particularly well.
Long-term UK residents can remain within the inheritance-tax system after leaving for a period determined by their previous UK residence history.
Leaving a country therefore does not necessarily mean immediately leaving its tax system.
The Wealthy Investor Wants Optionality
This helps explain the growth of multiple residences.
A wealthy family may want a principal residence.
A second residence.
A business base.
A family-office location.
And investment exposure to several countries.
This is not necessarily about avoiding tax.
It is about creating optionality.
If one jurisdiction changes its tax policy, the family is not completely dependent on it.
If political conditions change, the family has alternatives.
If investment opportunities change, capital can move.
The modern wealth strategy increasingly looks like a portfolio.
Residence itself becomes part of that portfolio.
Tax Diversification
This creates what could be called tax diversification.
Investors have long understood investment diversification.
They diversify equities.
Bonds.
Real estate.
Private equity.
Currencies.
Geographies.
Now wealthy internationally mobile families are increasingly diversifying their jurisdictional exposure.
They consider where they live.
Where they bank.
Where they invest.
Where companies are incorporated.
Where assets are held.
Where children are educated.
Where succession takes place.
And where the family office operates.
This does not mean creating artificial structures.
It means recognising that geography has become an economic variable.
The Family Office Makes the Calculation Larger
For a family office, the issue becomes even more significant.
The family’s investment portfolio may span dozens of countries.
The family may have businesses in several jurisdictions.
There may be trusts, foundations, holding companies, funds and direct investments.
A change in personal residence can affect the entire structure.
This is why family offices increasingly have tax lawyers involved in investment decisions.
Tax is no longer something applied to the portfolio after the investment committee makes its decision.
It is increasingly part of the investment committee’s decision.
Governments Know This
Governments understand the mobility of wealthy individuals.
That is why countries are increasingly designing specific regimes for international investors and entrepreneurs.
The objective is not necessarily to offer the lowest tax rate.
It is to create a proposition that is attractive enough for the individual to choose to become resident.
That creates a competitive market.
Italy competes with Switzerland.
Cyprus competes with Malta and Greece.
Portugal competes with Spain and Italy.
Monaco competes with the broader European market.
And jurisdictions outside Europe compete for the same families.
The investor has choices.
The Risk for Governments
There is an obvious danger.
Tax regimes can become political footballs.
A government introduces an attractive regime.
Wealth arrives.
Property prices rise.
Public opinion changes.
The government modifies the regime.
Investors who built long-term plans around the original rules suddenly face uncertainty.
This is exactly why tax stability has become so important.
The investor is not simply comparing today’s tax rate.
They are attempting to forecast the tax regime of tomorrow.
Certainty Is an Investment Return
This is perhaps the most important principle.
Suppose Country A offers an effective tax rate of 20%.
Country B offers 15%.
But Country A has stable legislation, strong institutions and a predictable policy environment.
Country B changes its rules every two years.
Which is cheaper?
The answer is not necessarily Country B.
A tax advantage that disappears after three years is not necessarily more valuable than a slightly higher rate that remains predictable for twenty years.
The wealthy investor is buying certainty.
The New Calculation
The modern HNWI should therefore think about residence in the same way as an investment.
Before moving, calculate:
Expected investment return
plus
tax cost
plus
wealth and inheritance exposure
plus
structuring costs
plus
cost of relocation
plus
political and regulatory risk
over the expected period of residence.
Then compare jurisdictions.
This is essentially an investment analysis.
The Geography of Wealth Is Changing
The result is a new European competition.
London still has its financial ecosystem.
Switzerland has its stability.
Monaco has its unique tax and lifestyle proposition.
Italy has its fixed-tax model.
Portugal is targeting productive activities.
Greece combines residence, lifestyle and investment.
Cyprus has the potential to combine residence with an international investment and fund ecosystem.
None is perfect.
None needs to be.
The wealthy investor is increasingly looking for the best combination.
Residence Is No Longer Just Residence
The biggest change is conceptual.
For the internationally mobile wealthy individual, residence is no longer simply the place where you sleep most nights.
It can determine the taxation of the portfolio.
The structure of the family office.
The location of the business.
The treatment of succession.
The ownership of property.
And the ultimate after-tax return on capital.
That makes residence an investment decision.
And as governments compete more aggressively for internationally mobile wealth, it may become one of the most important investment decisions a wealthy family makes.