US-Luxembourg tax treaty: A complete guide for Americans in Luxembourg (2026)
The US-Luxembourg tax treaty allows eligible residents to reduce or eliminate withholding taxes on cross-border income and claim relief from double taxation through foreign tax credits or exemptions.
The treaty covers dividends, interest, royalties, pensions, business profits, and employment income – and applies to US federal income taxes and Luxembourg income and corporate taxes.
At a glance – core treaty benefits:
- Withholding on dividends reduced to 15% for portfolio investors, 5% for corporate shareholders owning at least 10% of voting stock
- Withholding on interest reduced to 0% for beneficial owners
- Withholding on royalties reduced to 0%
- Double taxation relief through the foreign tax credit on Form 1116 for US filers, and through the exemption method for Luxembourg residents
- Pension income generally taxable only in the recipient's country of residence
- A Totalization Agreement that prevents dual social security contributions
If you are a US citizen or green card holder living in Luxembourg, the treaty does not exempt you from filing a US return. The US taxes its citizens on worldwide income regardless of where they live. What the treaty does is reduce the risk of paying full tax to both countries on the same income.
For how the foreign tax credit and the foreign earned income exclusion interact, see our guide to choosing between the FTC and FEIE.
History and scope of the US-Luxembourg income tax treaty
The current US-Luxembourg income tax treaty was signed on April 3, 1996, and entered into force on December 20, 2000. It replaced an earlier convention signed in 1962.
A protocol amending the treaty's exchange of information article was signed on May 20, 2009, ratified by the US Senate on July 17, 2019, and entered into force on September 9, 2019.
The US-Luxembourg income tax treaty follows the OECD model convention framework and includes a detailed Limitation on Benefits article designed to prevent treaty shopping.
It covers residents of both countries and applies to US federal income taxes and Luxembourg income tax, corporate income tax, and the communal trade tax.
The treaty does not cover Luxembourg's value-added tax or social security contributions. It does cover Luxembourg's capital tax (net wealth tax) on companies, alongside the income tax on individuals, corporation tax, and communal trade tax. Social security is addressed separately by the US-Luxembourg Totalization Agreement.
The full treaty text and protocol are available on the IRS Luxembourg treaty documents page.
For background on how foreign income timing affects your US return, see our guide on reporting the timing of foreign income and taxes paid.
Who qualifies for treaty benefits: residency and eligible taxpayers
To claim US-Luxembourg tax treaty benefits, a taxpayer must be a tax resident of one or both contracting states and satisfy the treaty's Limitation on Benefits provisions. The saving clause means US citizens generally cannot use the treaty to reduce US tax on their own worldwide income – except for specific excepted provisions.
The following categories of taxpayers may qualify for treaty benefits:
- US citizens resident in Luxembourg – may claim reduced withholding rates on US-source income as a Luxembourg resident, and may use the foreign tax credit to offset US tax on Luxembourg-source income
- Luxembourg residents with US-source income – may claim reduced withholding on dividends, interest, and royalties paid from the US
- Dual residents – must apply the treaty's tie-breaker rules to determine which country has primary taxing rights
- Entities meeting the Limitation on Benefits test – Luxembourg companies, partnerships, and trusts must pass specific ownership and base erosion tests before claiming treaty rates
Treaty definition of "resident"
The treaty defines "resident" as any person who, under the laws of a contracting state, is liable to tax there by reason of domicile, residence, citizenship, place of management, place of incorporation, or other similar criteria.
For a real-world example of how residency issues affect exclusion claims, see our FEIE denial case study.
The saving clause and its exceptions
The saving clause preserves the right of the US to tax its own citizens and residents as if the treaty did not exist. This is standard in US tax treaties and is the single most misunderstood provision for American expats.
Because of the saving clause, most US citizens living in Luxembourg cannot use the treaty to escape US taxation on Luxembourg-source income, but they can still benefit from treaty-reduced withholding rates as a Luxembourg resident.
The key exceptions to the saving clause include:
- The non-discrimination article
- The corresponding-adjustment relief for associated enterprises (Article 9(2))
- The Social Security provision of the pensions article (Article 19(1)(b))
- The relief from double taxation article – which allows US citizens to credit Luxembourg taxes against their US liability
- The mutual agreement procedure for resolving disputes between the two countries' tax authorities
In practice, the saving clause exception that matters most to individual US expats is the foreign tax credit. Even though the US continues to tax your worldwide income, you can credit Luxembourg income taxes paid against your US tax bill on Form 1116.
Foreign wages, self-employment income, and other foreign-source amounts each have a specific line on the return – see where to report foreign income on Form 1040 for the full breakdown.
Withholding tax rates under the US-Luxembourg tax treaty
Under the US-Luxembourg double tax treaty, withholding on interest paid to a beneficial owner resident in the other country is reduced to 0%, making Luxembourg a particularly attractive holding location for US investors.
Treaty rates apply only when the recipient is the beneficial owner of the income – not a nominee, agent, or conduit.
| Income type | Domestic rate without treaty | Treaty rate |
|---|---|---|
| Dividends – portfolio investors | 30% | 15% |
| Dividends – corporate shareholders owning 10%+ of voting stock | 30% | 5% |
| Interest | 30% | 0% |
| Royalties | 30% | 0% |
NOTE! The 30% figures above are the US statutory withholding rate absent the treaty; Luxembourg's own domestic law generally does not impose withholding on interest or royalties, and applies a lower rate to dividends.
The domestic 30% rate is the default US withholding rate on payments to foreign persons under IRC §1441 (nonresident alien individuals) and §1442 (foreign corporations). The treaty rates above replace that default when the beneficial owner provides proper documentation – typically Form W-8BEN for individuals or Form W-8BEN-E for entities.
Dividend taxation: treaty rates and beneficial owner requirements
The treaty provides a reduced 15% withholding rate on dividends for portfolio investors. A further reduced 5% rate applies when the beneficial owner is a company that directly owns at least 10% of the voting stock of the dividend-paying company.
A Luxembourg company that owns at least 10% of the voting stock of a US corporation may qualify for the lower US-Luxembourg tax treaty dividend withholding rate, but must satisfy the Limitation on Benefits test.
To claim the reduced rate, the recipient must:
- Be the beneficial owner of the dividends – meaning the person who has the right to use and enjoy the dividends, not an intermediary
- File Form W-8BEN for individuals or Form W-8BEN-E for entities with the withholding agent
- Satisfy the Limitation on Benefits article – particularly relevant for Luxembourg holding companies with third-country shareholders
"Beneficial owner" under the treaty means the person who has the economic right to receive the income and is not acting as an agent or nominee. A Luxembourg entity that receives dividends on behalf of a third-country parent is not the beneficial owner.
For the US tax treatment of foreign dividends, see our guide to taxation of foreign dividends.
Interest and royalty payments: treaty treatment explained
The treaty generally reduces withholding on interest to 0% for qualifying beneficial owners. This is one of the more favorable provisions in the US treaty network and applies to interest arising in one contracting state and paid to a resident of the other.
The 0% treaty withholding rate on US-Luxembourg tax treaty interest withholding is a key planning consideration for multinational structures involving Luxembourg holding or finance companies.
For royalties, the treaty also provides a 0% withholding rate on payments for the use of copyrights, patents, trademarks, and similar intangible property. The 0% rate applies when the royalty recipient is the beneficial owner and is resident in the other contracting state.
Nonresident aliens receiving US-source interest may also benefit from separate statutory exemptions for certain deposit and portfolio interest, which operate independently of the treaty.
For a broader overview of IRS interest income reporting, see our guide to Form 1099-INT.
Double taxation relief: foreign tax credit and exemption methods
US citizens in Luxembourg typically claim double taxation relief by filing Form 1116 to credit Luxembourg income taxes against their US tax liability, dollar-for-dollar up to the applicable limitation.
Luxembourg provides relief from its side through the exemption method, generally excluding US-source income from Luxembourg tax.
The four main points to understand:
- US foreign tax credit – the US allows a credit on Form 1116 for Luxembourg income taxes paid or accrued. The credit cannot exceed the US tax attributable to foreign-source income in a given category. Excess credits carry back one year and forward 10 years.
- Luxembourg exemption method – Luxembourg generally exempts income that is taxable in the US under the treaty, with a progression reservation that can affect the rate applied to remaining Luxembourg-source income.
- Form 1116 mechanics – you file a separate Form 1116 for each income category: passive, general, foreign branch, and others. The limitation formula is: US tax × foreign-source taxable income ÷ worldwide taxable income.
- FTC limitation – the credit cannot exceed the US tax attributable to your foreign-source income. If Luxembourg's effective rate exceeds the US rate on the same income, the excess credit carries forward.
De minimis exception
For taxpayers with creditable foreign taxes of $300 or less – $600 if married filing jointly – whose foreign income is only passive category and was reported to them on a qualifying statement such as a Form 1099-DIV, Form 1099-INT, Schedule K-1 (Form 1041), or Schedule K-3 (Form 1065 or Form 1120-S), you may skip Form 1116 and claim the credit directly on Schedule 3, line 1.
Interest or dividends paid directly by a Luxembourg bank or broker, with no such statement, don't qualify for this shortcut even if the amount is small.
See our detailed guide to claiming the foreign tax credit on Form 1116.
Permanent establishment rules under the treaty
A permanent establishment is a fixed place of business through which a US or Luxembourg enterprise carries on its business wholly or partly.
If a US business creates a permanent establishment in Luxembourg, its profits attributable to that PE become taxable in Luxembourg, making PE analysis critical for any American entrepreneur operating there.
The treaty specifically includes as PEs:
- An office, branch, or place of management
- A factory, workshop, or mine
- A building or construction site lasting more than 12 months
The treaty excludes from PE status activities that are preparatory or auxiliary in nature – such as maintaining a warehouse solely for storing goods, or maintaining a fixed place of business solely for purchasing goods or collecting information.
PE analysis also extends to construction sites exceeding 12 months and dependent agents acting on behalf of the enterprise – both covered in detail in our permanent establishment tax
Business profits article: taxing cross-border business income
Under the business profits article, a US enterprise's profits are taxable in Luxembourg only to the extent they are attributable to a Luxembourg PE – and vice versa. Profit attribution follows the arm's-length principle, meaning the PE is treated as if it were a separate and independent enterprise.
Based on a common TFX client scenario, a US consultant working remotely for a Luxembourg client from the US does not create a PE and therefore owes no Luxembourg corporate tax on those fees. The consultant's income is taxable only in the US, and Luxembourg has no taxing right over it.
Self-employed US citizens working in Luxembourg may face both US self-employment tax and Luxembourg social security contributions. The Totalization Agreement – covered in the next section – determines which country's system applies.
For self-employment tax implications, see our guide to avoiding double taxation for self-employed expats.
Pension and retirement income under the US-Luxembourg tax treaty
The treaty contains specific provisions for pensions and annuities.
Under the US-Luxembourg tax treaty, private pension income is generally taxable only in the recipient's country of residence, which can significantly reduce the overall tax burden for retirees living in Luxembourg.
Key provisions for retirement income:
- Private pensions and annuities – generally taxable only in the recipient's country of residence. A US citizen receiving a Luxembourg private pension while living in Luxembourg pays Luxembourg tax on that income. The saving clause means the US also taxes its citizen, but the foreign tax credit on Form 1116 offsets double taxation.
- US Social Security benefits for Luxembourg residents – under Article 19(1)(b) of the US-Luxembourg treaty text, US Social Security payments to a Luxembourg resident, or to a US citizen, are taxable only by the US. This is one of the treaty's express exceptions to the saving clause, so Luxembourg is barred from also taxing these benefits.
- Luxembourg pension income for US residents – a US resident receiving a Luxembourg state or private pension generally reports it on the US return and may credit any Luxembourg tax withheld.
Saving clause and pension income
The saving clause applies to US citizens receiving pension income – the US retains the right to tax worldwide income. The treaty's double taxation relief article provides the credit mechanism to prevent paying full tax in both countries.
See our comprehensive guide to Social Security benefits for Americans living abroad.
Social Security Totalization Agreement between the US and Luxembourg
The US and Luxembourg maintain a separate Totalization Agreement – distinct from the income tax treaty – that prevents double Social Security taxation. It also allows workers to combine credits from both countries to qualify for benefits.
The agreement was signed on February 12, 1992, and entered into force on November 1, 1993. The SSA's Luxembourg agreement pamphlet explains how credits from both countries combine for benefit eligibility.
The US-Luxembourg Totalization Agreement means that Americans working in Luxembourg generally pay into only one country's social security system, not both, eliminating a high cost for expat employees and self-employed individuals.
The agreement applies as follows:
- Detached workers – a US employee sent to Luxembourg by a US employer for up to five years continues paying into the US system only, with a certificate of coverage as proof
- Local hires – a US citizen hired directly by a Luxembourg employer pays into the Luxembourg system
- Self-employed – generally covered by the system of the country where they reside
- Combined credits – workers who have paid into both systems can combine credits to meet eligibility thresholds for retirement, disability, or survivor benefits
For a broader overview of how these agreements work, see our guide to Totalization Agreements and US expat taxes.
Tie-breaker rules for dual residents
When an individual is a tax resident of both the US and Luxembourg, the treaty's tie-breaker rules determine which country has primary taxing rights.
A US citizen who is also a Luxembourg tax resident must apply the treaty tie-breaker rules to determine which country has primary taxing rights, but the saving clause means the US will still tax the citizen on worldwide income.
The tie-breaker sequence for individuals:
- Permanent home – the country where the individual has a permanent home available. If there is a permanent home in both countries, move to the next test.
- Center of vital interests – the country where personal and economic relations are closer – family, social ties, business activities, and political or cultural involvement.
- Habitual abode – the country where the individual spends more time.
- Nationality – if still unresolved, the individual's citizenship.
- Competent authority agreement – if none of the above resolves the question, the tax authorities of both countries must agree on a determination.
If you rely on the tie-breaker rules to change your tax residency for US purposes, you generally must file Form 8833 to disclose that position.
There's a narrower exception than it looks. The $100,000 de minimis rule (Treas. Reg. §301.6114-1(c)(2)) waives disclosure only when the residency determination itself is the sole reportable item. If you're actually claiming nonresident status under the tie-breaker, Treas. Reg. §301.7701(b)-7 requires Form 8833 regardless of amount.
Limitation on Benefits: preventing treaty shopping
The Limitation on Benefits article restricts treaty benefits to residents who meet specific ownership and base erosion tests. This prevents third-country residents from routing income through Luxembourg or US entities solely to access favorable treaty rates.
The Limitation on Benefits article in the US-Luxembourg tax treaty is one of the most important anti-abuse provisions and must be analyzed before any cross-border structure is implemented.
A resident qualifies for treaty benefits under the Limitation on Benefits article if it meets any one of the following:
- Qualified resident test – covers individuals; the Luxembourg or US government; a company where at least 50% of the shares are ultimately owned by qualified residents or US citizens, and where deductible payments to non-qualifying persons don't exceed 50% of the company's gross income; a publicly traded company (or one majority-owned by a publicly traded parent); and certain not-for-profits
- Active trade or business test – the entity conducts substantial business activity in its country of residence, and the income item is connected to or incidental to that activity
- Discretionary relief – a resident who fails all the above tests can request treaty benefits through the competent authority, which has discretion to grant them
For context on related trust reporting requirements, see our guide to relief from filing Forms 3520-A and 3520 for certain tax-favored foreign trusts.
How to claim treaty benefits: Form 8833 and treaty disclosure
Form 8833 must be filed whenever a taxpayer takes a treaty-based return position that reduces or modifies US tax. Failure to file can result in a penalty under IRC §6712 of $1,000 per failure for individuals, or $10,000 per failure for a C corporation.
Not all treaty positions require Form 8833. Disclosure is waived for reduced withholding on dividends, interest, rents, and royalties beneficially owned by an individual or a government, regardless of amount and regardless of Form 1042-S reporting (Treas. Reg. §301.6114-1).
The same "regardless of amount" waiver applies separately to pension, annuity, and Social Security treaty positions.
There's also a general exception for treaty positions where the total income items that would otherwise need disclosure add up to $10,000 or less, as explained in the IRS instructions for Form 8833.
The process for claiming treaty benefits:
- Determine which treaty article applies to your income type – dividends, interest, royalties, pensions, business profits, or another category.
- Complete Form 8833 – Treaty-Based Return Position Disclosure. Identify the treaty, the specific article, the Code provision being overridden, and explain the facts supporting your position.
- Attach Form 8833 to your Form 1040 or 1040-NR – file it with your annual return by the applicable deadline.
- Obtain a tax residency certificate from Luxembourg if you are claiming reduced withholding as a Luxembourg resident. Luxembourg's Administration des Contributions Directes issues these certificates on request.
Outside those specific carve-outs, the exceptions from Form 8833 filing are narrow. Most other treaty-based positions – re-sourcing income, claiming an exemption, or relying on a treaty article not listed above – still require the form.
If you are taking a treaty position that changes how income is sourced, categorized, or excluded on your US return, Form 8833 is almost always required.
For an overview of common international tax forms, see our guide to foreign withholding forms.
The US-Luxembourg tax treaty technical explanation
The US Treasury released a Technical Explanation of the treaty around the time of Senate consideration in 1996, and a separate Technical Explanation of the 2009 protocol on June 7, 2011. These documents provide authoritative interpretive guidance on each article of the treaty.
The Treasury Technical Explanation of the US-Luxembourg tax treaty is the most authoritative plain-language guide to treaty intent and should be the first reference when a treaty provision is unclear.
It is not legally binding, but courts and the IRS routinely rely on Technical Explanations when interpreting ambiguous provisions.
Luxembourg entities and US tax reporting obligations
US persons with financial interests in Luxembourg face reporting obligations that exist independently of the treaty.
Based on a common TFX client scenario, a US person holding shares in a Luxembourg SICAV fund may face PFIC reporting obligations on Form 8621 regardless of treaty benefits, because the treaty does not override PFIC rules.
Key reporting requirements:
- FBAR – FinCEN Form 114 is required if the aggregate value of your foreign financial accounts – including Luxembourg bank and brokerage accounts – exceeds $10,000 at any point during the year. The 2026 FBAR deadline for tax year 2025 is April 15, 2026, with an automatic extension to October 15, 2026.
- FATCA – Form 8938 – required for US persons living abroad if foreign financial assets exceed $200,000 at year-end or $300,000 at any point during the year for single filers for tax year 2025.
- Controlled foreign corporation rules – US shareholders owning 10% or more of a Luxembourg corporation classified as a CFC must file Form 5471 and may owe tax on Subpart F income and GILTI.
- PFIC reporting – Luxembourg investment funds, including SICAVs and SICAFs, are almost always classified as PFICs for US tax purposes. Form 8621 is generally required for each PFIC interest, though a de minimis exception can eliminate the filing if your total PFIC holdings are $25,000 or less ($50,000 if married filing jointly) at year-end and you had no distributions or dispositions from those PFICs that year.
- Check-the-box elections – certain Luxembourg entity types may be eligible for a classification election on Form 8832 that changes how the entity is treated for US tax purposes.
US persons who own a Luxembourg disregarded entity must file Form 8858 annually, even if the entity has no taxable income in a given year.
When the same Luxembourg asset triggers multiple forms, our guide to foreign asset reporting and form overlap explains how FBAR, Form 8938, Form 5471, and Form 8621 interact.
Check-the-box elections for Luxembourg entities
Certain Luxembourg entity types – such as the SARL – may be eligible for a check-the-box election on Form 8832 to be treated as a disregarded entity or partnership for US tax purposes. This election can affect treaty benefit eligibility, GILTI exposure, and the required US reporting forms.
Electing disregarded entity status for a Luxembourg SARL can simplify US reporting but may also eliminate access to certain treaty benefits that require the entity to be treated as a separate taxable person. A disregarded entity is not a "resident" of Luxembourg for treaty purposes in the same way a corporation is.
Before making a check-the-box election, analyze the impact on:
- Treaty benefit eligibility – a disregarded entity may not qualify for reduced withholding rates
- GILTI and Subpart F exposure – disregarded entity treatment pushes income directly to the US owner's return
- Reporting requirements – the election replaces Form 5471 with the shorter Form 8858 in most cases
See our detailed guide to Form 8832 and the check-the-box election for foreign entities.
If you have years of unfiled US returns, the IRS Streamlined Filing Compliance Procedures may allow you to come into compliance with reduced or no penalties – provided the failure to file was non-willful.
Frequently asked questions
Not entirely. The treaty provides mechanisms – primarily the foreign tax credit and the exemption method – that reduce or eliminate double taxation on most income types.
US citizens remain taxable on worldwide income under the saving clause, but credits for Luxembourg taxes paid generally prevent paying full tax to both countries on the same income.
The treaty rate is 15% for portfolio investors. If the beneficial owner is a company holding at least 10% of the voting stock of the paying company, the rate drops to 5%. Without the treaty, Luxembourg's own domestic withholding rate on dividends would apply.
It depends on the type of benefit claimed. Form 8833 is required when you take a treaty-based return position that overrides a Code provision – for example, re-sourcing income, or invoking the tie-breaker rules to be treated as a nonresident. Positions that reduce or modify tax on pensions, annuities, or Social Security income are exempt from Form 8833 disclosure regardless of amount.
The same unconditional exemption applies to reduced withholding on dividends and interest for individual (or government) beneficial owners; Form 1042-S reporting isn't the trigger for that exemption.
The saving clause preserves the US right to tax its citizens on worldwide income as if the treaty did not exist. US citizens in Luxembourg cannot use the treaty to escape US tax on their worldwide income.
They can use the treaty's double taxation relief provisions – primarily the foreign tax credit – to offset Luxembourg taxes against their US liability.
Yes. US citizens and residents must report worldwide income, including Luxembourg-source interest. The treaty's 0% withholding rate benefits Luxembourg residents receiving US-source interest – it does not exempt US persons from reporting or paying US tax on Luxembourg interest income.
You may claim a foreign tax credit for any Luxembourg tax paid on that interest.
Yes. Self-employed US citizens living in Luxembourg generally pay into the Luxembourg social security system, not the US system. The agreement assigns coverage based on country of residence for self-employed workers, eliminating dual contributions.
A certificate of coverage documents the applicable system.
The LOB article prevents treaty shopping by restricting benefits to residents who meet specific ownership, base erosion, and activity tests.
A Luxembourg holding company with predominantly third-country shareholders may fail the LOB test and be denied treaty-reduced withholding rates on US-source dividends, interest, or royalties.
The company must pass the qualified resident test, which also covers publicly traded companies and their qualifying subsidiaries, the active trade or business test, or obtain discretionary relief from the competent authority before claiming treaty benefits.
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