Luxembourg Personal Income Tax Guide 2026

Overview — Tax Administration (ACD)

The Administration des contributions directes (ACD) under the Ministry of Finance administers all direct taxes in Luxembourg. Every taxpayer receives a tax identification number (numéro d'identification). Luxembourg operates a declaration and assessment system where individuals file annual returns and the ACD assesses tax due. The tax year follows the calendar year (1 January to 31 December). Annual tax returns must be filed by 31 December of the following year. The ACD has modernised its digital services through the MyGuichet.lu and eTax portals.

Luxembourg tax residents are taxed on worldwide income. Non-residents are taxed only on Luxembourg-source income. Tax residency is determined by physical presence (183+ days) or having the principal residence (foyer d'habitation) in Luxembourg.

Personal Income Tax Rates — Progressive 0%–45.78%

Luxembourg applies a progressive tax rate scale with multiple brackets. The rates for the 2026 tax year for Class 1 (single taxpayers) are:

• Up to EUR 12,438: 0% (exempt threshold)
• EUR 12,439 to EUR 14,508: 8%
• EUR 14,509 to EUR 16,578: 9%
• EUR 16,579 to EUR 18,648: 10%
• EUR 18,649 to EUR 20,718: 11%
• EUR 20,719 to EUR 22,788: 12%
• EUR 22,789 to EUR 24,858: 14%
• EUR 24,859 to EUR 26,928: 16%
• EUR 26,929 to EUR 28,998: 18%
• EUR 28,999 to EUR 31,068: 20%
• EUR 31,069 to EUR 33,138: 22%
• EUR 33,139 to EUR 35,208: 24%
• EUR 35,209 to EUR 37,278: 26%
• EUR 37,279 to EUR 39,348: 28%
• EUR 39,349 to EUR 41,418: 30%
• EUR 41,419 to EUR 43,488: 32%
• EUR 43,489 to EUR 45,558: 34%
• EUR 45,559 to EUR 47,628: 36%
• EUR 47,629 to EUR 49,698: 38%
• EUR 49,699 to EUR 51,768: 39%
• EUR 51,769 to EUR 53,838: 40%
• EUR 53,839 to EUR 200,004: 41%
• EUR 200,004 to EUR 220,452: 42%
• Over EUR 220,452: 42% plus employment fund surcharge

The top marginal rate includes the employment fund surcharge (Fonds de l'emploi) of 9% on the tax due for lower incomes and 10% for higher incomes, bringing the effective top rate to 45.78%.

Tax Classes — Class 1, Class 1A, Class 2

Luxembourg uses a tax class system similar to Germany's. The class determines the rate scale applied:

• Class 1: Single taxpayers, divorced, separated, or widowed individuals not qualifying for other classes. Standard rate scale with 1.0× multiplier.
• Class 1A: Single taxpayers with at least one dependent child, widowed individuals with children, and taxpayers aged 65+. Rate scale with 1.5× the Class 1 bracket widths — effectively a wider tax-free zone.
• Class 2: Married couples filing jointly. Rate scale with 2.0× the Class 1 bracket widths, allowing income splitting (quotité conjugale). The couple's combined income is divided by two, taxed at Class 1 rates, then multiplied by two.

The class system provides significant tax advantages for married couples (Class 2) and single parents (Class 1A).

Deductions and Allowances

Luxembourg offers numerous deductions from taxable income:

• Social security contributions: Fully deductible (employee share of pension, health, dependency, accident insurance)
• Mortgage interest: Deductible for owner-occupied housing (up to EUR 2,000 per year for first 5 years, reduced amounts thereafter)
• Pension contributions: Contributions to the second and third pillars are deductible up to certain limits
• Insurance premiums: Life insurance, health insurance, and accident insurance premiums (capped)
• Charitable donations: Deductible up to 20% of total net income
• Childcare expenses: Deductible for children under 14
• Employment expenses: Standard deduction of EUR 540 (minimum), actual expenses up to EUR 4,400

Employment Fund Surcharge (Fonds de l'Emploi)

The employment fund surcharge is an additional tax calculated as a percentage of the base IIT. For 2026, the surcharge rates are:

• 9% on IIT up to certain thresholds (for lower-income earners)
• 10% on IIT above certain thresholds (for higher-income earners)

The surcharge brings the effective top marginal rate to 45.78% (42% base rate × 110% = 46.2%, but the actual calculation results in approximately 45.78% when all bracket interactions are considered).

Tax Credits

• Employee tax credit (Crédit d'impôt salarié): Up to EUR 600 per year for low and middle-income employees
• Pensioner tax credit: Up to EUR 600 for low-income pensioners
• Child tax credit (Crédit d'impôt pour enfant): EUR 1,500 per eligible child per year
• Single parent credit: Additional credit for single parents (Class 1A)
• Domestic help credit: 25% of expenses for household services (capped)

Filing and Payment

Individual taxpayers must file an annual income tax return by 31 December of the following tax year. Filing is mandatory for all taxpayers whose income exceeds the tax-free threshold (EUR 12,438 for Class 1). The return is filed electronically via MyGuichet.lu. Employees generally have tax withheld at source by their employer through the monthly withholding system (retenue à la source). Self-employed individuals and those with significant non-employment income must pay quarterly instalments (acomptes provisionnels).

FAQs

What is the effective top marginal rate in Luxembourg?

The top marginal rate is approximately 45.78%, which includes the base rate of 42% plus the employment fund surcharge (9%–10%). This is relatively competitive compared to other EU countries with top rates over 50%.

How does income splitting work for married couples?

Married couples filing jointly under Class 2 have their combined income divided by two, taxed at Class 1 rates, and then multiplied by two. This significantly reduces the tax burden for couples with unequal incomes.

Do non-residents pay Luxembourg income tax?

Non-residents are taxed on Luxembourg-source income only. Employment income for work performed in Luxembourg is taxable. Non-residents may elect to be treated as residents for tax purposes if they earn at least 90% of their worldwide income in Luxembourg.

Disclaimer

This guide provides general information about Luxembourg personal income tax (IIT) for the 2026 tax year. Tax laws and rates may change. Always consult with a qualified Luxembourg tax advisor (conseil fiscal) or the ACD directly for advice specific to your situation. InvestmentKit does not provide tax advice.