Expat Tax Residency in Luxembourg

Luxembourg determines individual tax residence through two independent tests set out in Article 2 of the modified Loi du 4 decembre 1967 concernant l'impot sur le revenu (LIR), administered by the Administration des contributions directes (ACD). Satisfying either test triggers unlimited tax liability on worldwide income, placing Luxembourg alongside other OECD jurisdictions that follow a domicile-or-presence framework.

What establishes tax residence in Luxembourg?

Residence is established by (1) domicile -- a dwelling held under circumstances indicating an intention to keep and use it permanently, requiring an available, furnished abode occupied regularly and continuously -- or (2) customary abode (sejour habituel) -- physical presence in Luxembourg for more than six consecutive months [SC1, SC2]. Short interruptions (holidays, business travel) do not break continuity. Critically, the six-month threshold has retroactive effect: once crossed, residence is deemed to have begun on the very first day of arrival in Luxembourg, even when that day fell in the prior calendar year [SC2]. An individual arriving on 1 October and still present on 2 April of the following year meets the threshold and is treated as a resident for tax purposes from 1 October.

How are Luxembourg residents taxed on income?

Luxembourg tax residents are subject to personal income tax (impot sur le revenu des personnes physiques, IRPP) on their worldwide income from all sources: employment, self-employment, rental, capital, and pensions [SC1, SC3]. Non-residents are taxed only on Luxembourg-source income. The tax base is net income after deductions for professional expenses (minimum lump-sum EUR 540 annually), social security contributions, and certain personal allowances. The filing deadline for residents for the 2025 tax year is 31 December 2026, submitted electronically through the MyGuichet.lu portal [SC4].

What are the income tax rates and surtaxes?

Luxembourg uses 23 progressive brackets. The first EUR 13,230 is tax-free; the rate rises to 42% on income above EUR 234,870 [SC3]. On top of personal income tax, two additional levies apply:

• Solidarity surtax (contribution au fonds pour l'emploi): 7% of the income tax liability for most taxpayers; 9% for taxpayers in Tax Class 1 or 1a earning more than EUR 150,000, or Tax Class 2 couples earning more than EUR 300,000 [SC3].
• Dependency contribution (assurance dependance): 1.4% flat rate on gross professional income, with a monthly exempt threshold of EUR 675.94 (annual ceiling EUR 8,045.32 for 2025) [SC5].

Combined, the effective top marginal rate including the 9% solidarity surtax reaches approximately 45.78% on very high incomes.

How do tax classes affect the rate?

Luxembourg assigns every resident to one of three tax classes that determine which tax schedule applies:

Married cross-border workers default to Class 1 but may claim Class 2 if at least 90% of household income is taxable in Luxembourg or total foreign income does not exceed EUR 13,000 [SC6].

What is the impatriate regime and who qualifies?

Luxembourg introduced an impatriate tax regime in 2021 and substantially reformed it effective 1 January 2025. The 2025 regime provides a 50% exemption on annual gross remuneration capped at EUR 400,000 (maximum annual tax exemption EUR 200,000), available for the year of arrival and the following eight years -- nine fiscal years in total [SC7, SC8]. Eligibility conditions under the Grand-Ducal Regulation of 19 December 2020 and the 2024 amending legislation:

• The individual is hired from abroad or seconded to a Luxembourg employer (or permanent establishment).
• Annual fixed gross salary of at least EUR 75,000.
• The individual was not subject to Luxembourg income tax, did not reside in Luxembourg, and did not reside within 150 km of the Luxembourg border for the five years preceding the start of Luxembourg activities [SC7, SC8].
• The individual is highly qualified: possessing in-depth technical expertise or a minimum of five years of specialist experience.
• The number of impatriation-regime beneficiaries may not exceed 30% of the employer's full-time workforce (waived for companies established less than 10 years).

Employers must submit a list of qualifying employees to the ACD by 31 January each year [SC8]. The old pre-2025 scheme -- which reimbursed specific relocation costs capped at 30% of salary or EUR 50,000 per year (EUR 80,000 with spouse) -- applies to employees who were already benefiting before 2025; they may elect to switch to the new flat-rate scheme [SC7].

For an employee earning EUR 300,000 annually, the 2025 regime exempts EUR 150,000 from income tax (50% of EUR 300,000, well within the EUR 400,000 cap), resulting in tax computed on EUR 150,000 rather than EUR 300,000. For someone earning EUR 500,000, the exemption is capped at EUR 200,000 (50% of EUR 400,000), so EUR 300,000 remains taxable. The regime does not reduce social security contributions or the dependency contribution [SC7].

For further context on Luxembourg's broader tax framework and the network of double-taxation treaties the Grand Duchy maintains, see the Luxembourg country overview. For cross-jurisdiction comparison with neighbouring Germany -- whose border workers can interact with the Luxembourg 90%-income-source test for Class 2 -- see Germany expat tax residency. Compliance under the impatriate regime and the annual LIR filing involves multiple interacting rules; the positions described here summarise the statutory framework and should not substitute for review by a qualified professional registered with the ACD or an Ordre des experts-comptables member.