Luxembourg vs “Holding Company AA”, March 2026, Administrative Court, Case No 48905
Table of Contents
Case Information
Court: Tribunal administratif du Grand-Duché de Luxembourg, 5e chambre
Case number: 48905
Citation: ECLI:LU:TADM:2026:48905
Applicant: Société à responsabilité limitée (AA)
Respondent: Directeur de l'administration des Contributions directes
Jurisdiction: Luxembourg
Judgment date: 18 March 2026
Judgment Summary
The applicant, a Luxembourg société à responsabilité limitée referred to throughout as (AA), challenged a director's decision of 16 February 2023 that upheld corrective tax assessments for corporate income tax and municipal business tax for the years 2012 to 2015. The assessments arose from a tax audit covering fiscal years 2014 to 2018, conducted under paragraphs 162(9), 193 and 206 of the Abgabenordnung (AO), whose findings were extended back to 2012 once the audit report was completed on 14 June 2022.
The audit had been triggered in part by a spontaneous exchange of information received from the Belgian Federal Public Service for Taxation on 17 December 2019. That exchange revealed that a Belgian resident company affiliated with (AA)'s group had demonstrated to the Belgian authorities that it bore no significant functions, assets or risks in connection with an intra-group financing branch in Luxembourg, and that the Belgian authorities had concluded those credits and revenues were attributable to (AA).
The court declared itself incompetent to issue injunctions against the tax office, found the claims relating to years 2016, 2017 and 2018 inadmissible, declared the reformation claim for years 2012 to 2015 admissible and partially well-founded, and referred the matter back to the Director of the Administration des Contributions directes for reassessment limited to the guarantee-fee element.
Background
The applicant (AA) is a Luxembourg société à responsabilité limitée whose sole shareholder is (CC), a Luxembourg-resident parent company listed on Euronext Paris. (AA) held four Luxembourg sub-holding companies. It employed one person and contributed 40% of the salary costs of a shared receptionist.
In 2007 a Belgian resident company, referred to in the judgment as BelCo (formerly denominated (BB) and later (CC) Belgium), created a Luxembourg permanent establishment referred to as the Branch or ES, in order to carry out intra-group financing activities. The Branch was recognised by all parties as a Luxembourg permanent establishment within the meaning of Article 5 of the Luxembourg-Belgium double-tax convention.
The Branch obtained two advance tax rulings from the Administration des Contributions directes (ACD). The first was validated on 30 May 2007 following a request dated 5 April 2007. The second ruling (the Second Ruling) was requested on 29 October 2012 and validated on 14 January 2014 with effect from 1 January 2012. The Second Ruling confirmed that the Branch could claim a notional interest deduction on more than 99% of the interest income it generated, on the basis that BelCo had assumed the credit risk on the Branch's financing activity under a contract dated 7 March 2012.
On 8 March 2012, one day after that contract, (AA) issued a counter-guarantee letter by which it undertook to cover all credit risks surrounding the intra-group financing activity allocated to the Branch and initially covered by BelCo. This letter was not disclosed to the Luxembourg tax authorities at the time of the Second Ruling request or in (AA)'s own tax returns. It was communicated to the ACD for the first time on 21 January 2022, in the course of the audit.
On 17 December 2019 the Director of the ACD received information spontaneously from the Belgian tax authority. Belgian investigators had found that BelCo declared it was not involved in Belgium in the financing activity and had no personnel or financial resources to bear the associated credit risk, and that the Belgian authorities concluded the credits and revenues were attributable to (AA). The Belgian findings were based in part on the counter-guarantee letter of 8 March 2012, which BelCo had provided to the Belgian authorities to resist Belgian taxation.
Core Dispute
The central dispute was whether the ACD was entitled to increase (AA)'s taxable income for the years 2012 to 2015 by treating it as the entity that concentrated the significant functions, assets, risks and decision-making powers related to the intra-group financing activity, and therefore as the entity that should have been remunerated for that activity at arm's length.
The applicant argued, first, that as a holding company with no employees and no involvement in the financing activity it could at most have been entitled to a guarantee fee, not to the full notional-interest amounts deducted by the Branch. Second, it contended that the adjustments indirectly invalidated the Second Ruling, violating the principles of legitimate expectations, good faith and legal certainty. Third, it argued that the claims for years 2012 to 2016 were time-barred under the five-year ordinary prescription, since the counter-guarantee letter could not constitute a new fact within the meaning of paragraph 222(1)(1) AO.
The State argued that (AA) had issued the counter-guarantee without charge, thereby suppressing taxable income in breach of Article 56 of the loi concernant l'impôt sur le revenu (LIR) as applicable across the years in question, that the Belgian exchange of information constituted new facts justifying corrective assessments, and that the ten-year prescription therefore applied.
Court Findings
On admissibility, the court declared itself incompetent to issue injunctions against the tax office, as no specific legal provision conferred that power. The claims relating to years 2016 and 2017 were declared inadmissible for lack of interest, because (AA) had been part of a fiscal integration group since 2016 and its individual corporate income tax and municipal business tax had been set at zero euros for those years; any challenge could only be brought at the level of the integrating parent company. The claim relating to year 2018 was declared inadmissible for lack of object, as no corrective bulletin had been issued for that year when the complaint was lodged.
On the existence of new facts and prescription, the court held that the information spontaneously transmitted by the Belgian tax authority on 17 December 2019, including the counter-guarantee letter of 8 March 2012, constituted new facts within the meaning of paragraph 222(1)(1) AO. The court noted that the content of the information available to the tax office before that date could not reasonably have given rise to doubts about (AA)'s undisclosed activities, and that (AA) itself only confirmed the counter-guarantee's existence after the tax office had twice pressed the point. Accordingly, the ten-year prescription under Article 10 of the law of 27 November 1933 applied, and the corrective assessments issued on 10 August 2022 for years 2012 to 2015 were not time-barred.
On the merits of the adjustments, the court confirmed that Article 56 LIR, in its version applicable before 2015 and in its revised version applicable from 1 January 2015, governed the dispute. Under the applicable burden-of-proof rules, the State was required to establish a bundle of indices rendering it probable that (AA)'s profits had not been determined on arm's-length terms; if such a bundle were established the burden shifted to (AA).
The court held that the State could not simply adopt the Belgian tax authority's findings as its own. The State was required to assess those findings as a question of fact in the light of Luxembourg law, taking account of its own binding decisions, and to analyse independently whether the significance of the relevant functions was the same under Luxembourg law, what impact the notional-debt mechanism might have on functional profiles and assets, and whether there was in reality a disparity between Luxembourg and Belgian rules or their application. Having failed to conduct that analysis, the State had not established that the significant functions of the intra-group financing activity were necessarily exercised in Luxembourg.
The court further held that, even setting aside the Belgian findings, the remaining indices relied on by the State, namely the role of Mr (A) across several Luxembourg entities and the existence of the counter-guarantee letter, were insufficient to establish a transfer of all significant functions, decision-making powers, risks other than credit risk, and assets to (AA). The Second Ruling's validity was not contested, and the court noted that it had been granted on a specific factual basis that included validation of a notional-interest structure; the absence of an actual payment of interest did not automatically entail an absence of any taxation, but a ruling validating a margin-only approach for one entity did not amount to a blanket authorisation exempting the rest of the structure from taxation.
Nevertheless, the court held that the State had validly established that (AA) bore a very significant portion of the credit risk on the intra-group financing activity through the counter-guarantee letter, had the financial capacity to do so, and received no remuneration for that function. (AA) itself acknowledged this and provided a transfer-pricing study that stated a third party would be willing to pay for such a guarantee and that a guarantee fee should therefore be charged. The court therefore found a sufficient bundle of indices to justify an arm's-length upward adjustment limited to remuneration for the guarantor function and the associated credit risk.
On the Second Ruling, the court held that the Second Ruling concerned the Branch alone, not (AA), so (AA) could not rely on it to claim legitimate expectations regarding its own tax position. Furthermore, the Second Ruling contained no reference to the counter-guarantee letter, so adjustments flowing from that letter could not be said to contravene the ruling.
On the alleged conflict of interest within the administration, the court rejected the argument because (AA) had not explained what legal consequences it was said to produce.
Costs were divided equally between (AA) and the State. The request for a procedural indemnity of 2,000 euros was rejected because (AA) had not explained why it would be inequitable to leave those costs at its charge.
Outcome
The court partially upheld the reformation claim. It held that the corrective adjustments for years 2012 to 2015 were justified only to the extent of remuneration for the guarantor functions and credit risks assumed by (AA) pursuant to the counter-guarantee letter of 8 March 2012, and not to the full extent of the notional interest deducted by the Branch. The court set aside the director's decision of 16 February 2023 to that extent and referred the matter back to the Director of the Administration des Contributions directes for reassessment on that limited basis. The claims relating to years 2016, 2017 and 2018 were declared inadmissible. The court declared itself incompetent on the injunction request. Costs were split equally between the parties.
TP Method Highlighted
The Second Ruling, validated on 14 January 2014 with retroactive effect from 1 January 2012, used one of the OECD methods for allocating profits to permanent establishments as described in the 2010 OECD Report on the Attribution of Profits to Permanent Establishments (22 July 2010). Under that approach, the Branch was treated as bearing only limited credit risk and performing routine administrative and management functions, so it was entitled to retain only a small arm's-length margin; more than 99% of the interest income it generated was subject to a notional interest deduction corresponding to the notional funding cost of the activity allocated to BelCo.
For the purpose of the audit adjustments, the revision service used the notional interest amounts already calculated and accepted by the Branch under the Second Ruling as the quantum of the redressement at the level of (AA), treating those amounts as the revenues that (AA) should have recognised.
The court did not endorse this approach in full. It confirmed that an arm's-length guarantee fee, as described in the transfer-pricing study submitted by (AA) itself, was the appropriate basis for any adjustment, but left the exact quantification to the Director on referral. The transfer-pricing study provided by (AA) indicated that a third party would be willing to pay for such a guarantee and that a guarantee fee should therefore be charged, without specifying a particular OECD method by name.
Major Issues / Areas of Contention
- Whether the counter-guarantee letter of 8 March 2012, not disclosed to the Luxembourg tax authorities at the time of the Second Ruling or in (AA)'s own returns, constituted a new fact under paragraph 222(1)(1) AO justifying corrective assessments.
- Whether the ten-year prescription under Article 10 of the law of 27 November 1933 applied, or whether the ordinary five-year period had expired before the corrective bulletins were issued on 10 August 2022.
- Whether the Luxembourg tax authorities could rely on the conclusions of the Belgian tax authority, derived from the Belgian fiscal investigation of BelCo, as a basis for attributing the significant functions, assets, risks and decision-making powers of the intra-group financing activity to (AA) under Luxembourg law.
- Whether Article 56 LIR, in its pre-2015 version and its version applicable from 1 January 2015, permitted an upward adjustment of (AA)'s taxable profits to the full extent of the notional interest deductions taken by the Branch.
- Whether providing a credit-risk counter-guarantee without charge constituted a non-arm's-length transaction requiring an income adjustment, and if so whether that adjustment should be limited to a guarantee fee rather than the full notional-interest amounts.
- Whether the corrective adjustments indirectly contravened the Second Ruling and thereby violated the principles of legitimate expectations, good faith and legal certainty, given that the Second Ruling was not formally revoked.
- Whether the claims relating to years 2016 and 2017 were admissible, given that (AA) had been part of a fiscal integration group since 2016 and its individual tax assessments for those years had been set at zero euros.
- Whether the claim relating to year 2018 was admissible in the absence of any issued assessment for that year at the time the complaint was lodged.
- Whether the tribunal had jurisdiction to issue injunctions directing the tax office to annul the corrective assessments.