These days it’s common for families to build their lives across more than one country as careers, education and lifestyle choices take them further from home. A child may be born abroad, a partner may hold a different passport or a property may sit in another jurisdiction. Over time these links can make even simple decisions such as where to live, invest or pass on assets more complex than expected. Many families now want a clearer picture of how their citizenships and residencies fit together and how new tax and legal rules could affect them. This article looks at what’s changing and how thoughtful planning can help bring those pieces into balance.
Families with mixed nationalities: practical realities
For many international families, life moves between countries almost without notice. That might mean spending part of the year abroad for work, keeping a home in another country or having children born overseas. These choices often feel straightforward at the time, yet each one adds another layer of legal and tax connection that can surface later. A couple might assume their estate will pass under the law of their home country only to find that their second residence abroad applies its own inheritance rules. A child with dual citizenship could have tax filing obligations in more than one place even without income. Even simple steps like opening a joint account or buying property in a spouse’s country can raise questions about ownership and succession. It helps to start with a clear map of where each person is resident, where assets are held and which laws apply. That overview forms the base for consistent planning and keeps the picture steady as life moves across borders. If your family holds property or accounts in more than one country, make a list of which authorities could claim tax or legal rights over them.
Tax exposure and reporting obligations
Tax exposure is often where cross-border living starts to create real pressure. Families with mixed nationalities can find that more than one country claims taxing rights on the same income, property or inheritance. Under the Common Reporting Standard and FATCA, banks now share account and investment data automatically with the tax authorities where each account holder is considered resident. That means every jurisdiction involved needs to match its records or questions soon follow. Many countries also apply residence-based taxation, which can trigger liabilities once someone spends a set number of days there even if their main home or family base is elsewhere. A few extra weeks abroad to manage a property or an extended school term in another country can quietly turn into a tax residency issue. The simplest safeguard is to keep accurate travel records and certificates of residence and to share them with your advisers so filings stay consistent. Where overlaps occur, double taxation treaties can often resolve them but only if income and ownership are structured with that in mind. If you spend more than 183 days in one country during a year, check how that affects your tax status before the next filing cycle.
Cross-border inheritance and family structures
Tax planning often leads straight into inheritance. Once a family’s income and assets are clear, the next step is understanding how those assets will be treated when passed on. Each country has its own succession law and these rules rarely match. Civil law systems such as in much of Europe reserve fixed shares for children or spouses, while common law systems allow greater freedom through wills and trusts. If a parent dies with property in a civil law country and investments held through a trust elsewhere, the two systems can conflict. A court in one country might recognise the trust while another could apply forced heirship rules and distribute shares differently. The most effective way to prevent that is to identify early which law will govern the estate and make that choice explicit in the will. Parents with young children should confirm that their chosen guardians are recognised in every country where they hold citizenship or assets. For families using trusts or private foundations, it’s worth checking that each jurisdiction accepts their structure and tax treatment. If your will names guardians abroad, confirm that local courts would recognise their appointment before finalising it.
Evolving rules and planning responses
Governments are tightening the standards around international residence, taxation and citizenship. In the UK, the long-standing non-dom regime that let long-term residents keep overseas income outside the UK tax system ended in April 2025. From 2026 foreign residents will be taxed on their worldwide income and gains after a short transition period. Italy, Portugal and Greece have made similar changes, scaling back flat-tax schemes or tying them to stricter residence requirements. Across Europe authorities are defining tax residency more precisely. It’s no longer just about counting days; they also look at where the family’s home is, where children attend school and where management decisions are made. At the same time, citizenship and residency-by-investment programmes are facing closer scrutiny, with applicants often required to show proof of genuine local presence or contribution. Families are adapting by formalising substance. They’re ensuring trustees and directors are based where management occurs, keeping minutes of decisions and reviewing wills to reflect new definitions of residence. If you hold residency or citizenship through investment, check that your current level of presence still meets updated programme requirements.
The case for integrated citizenship and succession advice
These newer rules have changed how families plan. It’s no longer enough to look at tax, residence or inheritance on their own since each can influence the others in ways that aren’t obvious at first. A trust that once worked well may now need local oversight or a change in citizenship could alter which country’s courts have authority over an estate. Families who take a joined-up approach tend to stay in control. They make sure advisers coordinate across borders, update wills when they move or acquire new assets and confirm that reporting matches where they actually live and manage affairs. If you haven’t reviewed your structure in the last two years, consider bringing tax, legal and immigration advisers together for one discussion. It’s often the fastest way to spot small inconsistencies before they grow into formal issues.
How The Knightsbridge Group can help
The Knightsbridge Group advises families whose lives and assets span multiple countries. Our team brings legal, tax and immigration expertise together to build coherent plans that protect wealth, clarify reporting duties and support long-term residence or citizenship goals. Each structure is tailored to reflect the client’s family ties, current obligations and future intentions with coordination across trustees, banks and legal partners worldwide. To review your current arrangements or plan new citizenship and succession strategies, contact info@kbgroup.ae.
