Personal taxation · Luxembourg
Foreign income in Luxembourg: tax return and global rate
Foreign income does not have a single treatment. You need to identify your tax residence, the category of income and the tax treaty between the States. Depending on the case, the income is taxable, exempt with progression or treated under a credit mechanism. Exempt income may still be needed for the tax return and the rate calculation.
Financial Services Luxembourg · Licensed accountant · Head of the firm: Mickaël LOC. Editorial update: .
The method in four questions
- Where are you tax resident for the year in question?
- Which category does the income fall into: salary, pension, rent, dividend, interest or business activity?
- Which State has the right to tax under the applicable tax treaty?
- How does the other State avoid double taxation for this specific income?
Residents and non-residents: different starting points
For a Luxembourg resident, foreign income is part of the analysis of the worldwide file, subject to statutory and treaty rules. For a non-resident, you must distinguish income taxable in Luxembourg from foreign income needed for an option, an adjustment or a rate calculation.
The mere fact that tax was paid abroad does not allow you to remove the income from the Luxembourg tax return. Conversely, income paid into a foreign account is not automatically foreign-source income.
A matrix for building your file
| Income | Information to gather | Question to resolve |
|---|---|---|
| Salary | Employer, places of work, days and certificates | Allocation of the taxing right |
| Rent | Country of the property, ownership, receipts and expenses | Treaty treatment and relevant net income |
| Pension | Paying body and type of pension | Specific rule for public or private pensions |
| Dividend or interest | Payer, country, gross amount and withholding tax | Taxation, exemption or credit depending on the regime |
| Self-employed activity | Nature, places of activity and result | Classification and any business base abroad |
Exemption with progression: a fictitious example
Suppose a tax treaty exempts foreign income in Luxembourg while allowing it to be taken into account to determine the rate. This income is not directly subject to Luxembourg tax, but it may change the tax calculated on your other income.
This explains why a taxpayer's Luxembourg tax may change without the foreign income being added to the same taxable base. This example illustrates a mechanism; it does not presume the treatment of any particular country or income.
Avoiding common mistakes
Keep the gross amounts, withholding tax and supporting documents rather than a single net amount received. Do not convert a foreign withholding tax into a tax credit without checking the conditions, limits and evidence. Also keep the income year separate from the year in which a tax balance is paid.
For a cross-border couple, the spouse's income may be needed even if the spouse does not work in Luxembourg. The engagement should specify whether coordination with a professional abroad is planned.
The firm’s other tax engagements
Depending on your situation, the firm also handles tax, VAT and payroll, the regularisation of late tax filings and assistance during a tax audit. Fees are listed in the firm’s fee grid.
Official sources and scope
- ACD: assimilation to residents, article 157ter
- ACD: questions from non-resident taxpayers
- ACD: forms for individuals
The rules apply to the year and profile concerned. Examples flagged as fictitious explain a method; they are not an individual validation. The documents and options of your file are covered by a separate engagement.