Financial Planning Guide: Luxembourg for British Expats and International Investors

Luxembourg is one of the world's most remarkable financial jurisdictions — a small country of approximately 660,000 people that hosts over 140 banks, more than 15,000 investment fund entities, and one of the highest GDP per capita figures in the world. As the EU's premier fund domiciliation hub and a stable, triple-A-rated euro-area economy, Luxembourg attracts a uniquely international workforce: approximately half of the resident population was born abroad, and over 180,000 cross-border commuters add to the daily workforce. For British expats, HNW investors, and financial professionals, Luxembourg offers a compelling combination of tax efficiency, financial infrastructure, and European connectivity.

Luxembourg Tax Residency

Luxembourg tax residency is established by physically residing in Luxembourg — registration with the commune (commune de résidence) is required and triggers automatic enrolment with the tax administration (ACD — Administration des contributions directes). The standard test is 183 days of presence in the country in a calendar year, though the facts-and-circumstances approach can capture earlier residency in practice.

Luxembourg resident individuals are taxed on worldwide income. The country has one of Europe's most extensive treaty networks (over 80 in force), and its sophisticated private banking and wealth management sector provides an infrastructure well-suited to internationally structured affairs.

Luxembourg Income Tax

Luxembourg income tax (impôt sur le revenu des personnes physiques) is progressive, with rates ranging from 0% on income up to the exempt threshold to 42% on income above approximately €220,788. A contribution to the fonds pour l'emploi of 9% of the tax liability (applying above a certain income) effectively adds a small surcharge at higher levels.

Key features:

• The top marginal rate of 42% (plus the employment fund surcharge) is among the more moderate top rates in the EU — notably lower than Belgium (55%), France (49%), or Germany (~47.5%).
• Generous deductions are available for mortgage interest, pension contributions, childcare costs, and other domestic expenditures.
• Joint taxation (imposition collective) for married couples can reduce effective rates materially for households where there is a significant income differential.

Luxembourg also levies a taxe sur les salaires (payroll tax component) and social security contributions. The overall tax-on-labour burden is high in absolute terms but competitive compared to the nearest European neighbours.

The Impatriate Regime: Tax Relief for Internationally Mobile Employees

Luxembourg has operated a special tax regime for qualifying internationally mobile employees — commonly referred to as the impatriate regime — since 2011. The regime was substantially reformed by legislation adopted in December 2024 and applies in its new form from the 2025 tax year.

Core benefit (from 2025):

• 50% exemption: 50% of an eligible employee's gross annual remuneration is exempt from Luxembourg income tax, on a remuneration base of up to €400,000 per year (so a maximum exemption of €200,000 a year). This single, simplified exemption replaces the previous package of partial exemptions for impatriate bonuses, relocation costs, and other expatriation expenses.

Qualifying criteria:

• Recruited directly from outside Luxembourg or seconded to a Luxembourg employer from an international group
• Not Luxembourg tax resident — and not resident within 150km of the Luxembourg border — in the five years immediately preceding employment
• A minimum annual base salary of €75,000

Duration: up to nine fiscal years from the start of Luxembourg employment. Employees who benefited from the pre-2025 regime could elect (irrevocably) to remain under the old rules or move to the new one.

The reformed impatriate regime aligns Luxembourg more closely with comparable schemes in France and Italy and provides meaningful relief — particularly for senior executives in the financial sector where compensation packages are substantial.

No Capital Gains Tax: A Key Advantage

One of Luxembourg's most significant practical advantages for private investors is the absence of capital gains tax on long-held financial assets. Gains from the sale of shares, bonds, investment funds, and most other securities that have been held for more than six months are completely tax-exempt for private individuals. This is a definitive rule, not a concession subject to thresholds or administrative complexity.

Gains on assets held for six months or less are classified as speculative (bénéfices spéculatifs) and taxed at the individual's marginal income tax rate. The planning implication is clear: investors should hold assets for at least six months before disposal to secure full CGT exemption.

For real estate: gains on properties held for more than two years are exempt from CGT for private individuals. Gains on property held for under two years are taxed.

This places Luxembourg in a small group of European countries — alongside Belgium and Switzerland for private investors — where large portfolio disposals can be made entirely free of capital gains tax. For a client planning to crystallise a gain of several million pounds after liquidating a long-held portfolio, the tax saving relative to the UK (at 18–24%) or France (at 30%) is very substantial.

Luxembourg's Role as an Investment Fund Centre

For HNW clients and family offices, Luxembourg's unparalleled fund infrastructure is a unique asset. As the world's second-largest fund domicile, it hosts:

• UCITS funds: the global standard for retail and cross-border distribution, predominantly domiciled in Luxembourg or Ireland
• SICAR (Société d'investissement en capital à risque): for venture capital and private equity investment
• SIF (Specialised Investment Fund): for qualified investors, more flexible regulation
• RAIF (Reserved Alternative Investment Fund): introduced in 2016, requires an authorised alternative investment fund manager but does not require CSSF (regulator) approval of the fund itself — enabling very rapid launch timelines

For a family office or investment holding structure, a Luxembourg RAIF or SIF can provide a regulated, EU-passportable investment vehicle with genuine substance and institutional credibility. The Luxembourg SOPARFI (holding company) and Part II funds are also widely used for holding international property and investment portfolios.

These structures are sophisticated and require professional management, but for the right profile of client — typically a family office or UHNW investor with €5m+ in investable assets — Luxembourg fund vehicles offer flexibility and institutional recognition that few other jurisdictions can match.

UK Pensions in Luxembourg

Under the UK-Luxembourg Double Tax Treaty, private and occupational UK pension income is taxed in Luxembourg as the state of residence. Key practical steps:

• Apply for an HMRC NT code to prevent UK withholding tax being applied at source.
• Luxembourg income tax applies at the applicable progressive rate.
• Government and civil service pensions are UK-only under the treaty's government service provision.

Luxembourg's state pension system (Caisse nationale d'assurance pension — CNAP) is contribution-based. A qualifying pension accrues through employment in Luxembourg, with a minimum contribution period of ten years required to draw a benefit. British expats on shorter assignments may not reach this threshold; contribution records can sometimes be combined with periods in other EU member states under social security coordination rules.

Luxembourg Inheritance and Wealth Tax

Luxembourg's inheritance tax (droits de succession) applies to the transfer of assets on death. Rates and exemptions vary by relationship:

• Transfers to surviving spouses and direct descendants: exempt (or nominal rates for very large estates)
• Transfers to siblings and parents: rates from approximately 6%
• Transfers to unrelated individuals: rates up to 15%

These rates are relatively modest compared to Belgium (up to 80% for non-relatives) or France (up to 60% for non-relatives). Luxembourg does not levy a recurring annual net wealth tax on individual residents (an annual net wealth tax (impôt sur la fortune) applies to corporate entities but not individuals).

Luxembourg has signed an extensive network of bilateral estate tax treaties, including with the UK, which helps to prevent double taxation on cross-border estates. Professional advice is still advisable for clients with significant assets in multiple jurisdictions.

Property and Banking in Luxembourg

Luxembourg's residential property market is one of Europe's most expensive per square metre, reflecting chronic undersupply relative to the rapidly growing workforce. Prices in and around Luxembourg City have risen substantially over the past decade. Purchase costs include registration duty (droits d'enregistrement) and notary fees, totalling approximately 7–10% of the purchase price for residential properties.

The banking sector is deep, with major Luxembourg banks including Banque Internationale à Luxembourg (BIL), Banque de Luxembourg, ING Luxembourg, and the Luxembourg branches of major global private banks. For HNW clients, Luxembourg private banking offers genuine sophistication — multi-currency accounts, structured products, and access to Luxembourg-domiciled fund products — alongside full CRS reporting compliance.

Planning Checklist for Luxembourg

• Understand the six-month rule on capital gains: hold assets for more than six months before disposal to secure full CGT exemption.
• Engage the employer to apply for the impatriate regime within the permitted window.
• Apply for an HMRC NT code on UK pension income.
• Explore whether a Luxembourg RAIF or SOPARFI structure is appropriate for larger family office or investment holding requirements.
• Review estate planning given Luxembourg's relatively benign inheritance tax rates — structures that work well in higher-rate jurisdictions may not be necessary.
• Maintain offshore banking relationships where appropriate for non-Luxembourg assets.

This guide reflects the position as of mid-2026 and should not be treated as legal or tax advice. Luxembourg tax law is subject to change. The value of investments can fall as well as rise. Seek qualified professional advice before making decisions.

How Global Investments can help

Global Investments advises internationally mobile clients and HNW investors on the full range of financial planning considerations relevant to Luxembourg — from pre-arrival structuring and impatriate regime coordination to investment wrapper selection, pension planning, and Luxembourg fund vehicles for family offices. We work alongside specialist Luxembourg tax and legal advisers and can facilitate introductions to Luxembourg's private banking ecosystem. Contact us to arrange an initial consultation.