The facts
(A) S.à r.l. is a Luxembourg holding company incorporated in October 2014, whose sole activity is holding two Southeast Asian participations in infrastructure companies, (C) and (CC), acquired on 30 April 2015. (A) is wholly owned by (D), a group entity. To finance the acquisitions, (A) received two shareholder loans from another group entity (E) on 31 December 2015 — a combined amount in USD under two agreements described as ‘Shareholder’s Loan Agreements’. Both loans carried zero interest.
Separately, (A) had applied to the Luxembourg tax authorities in August 2015 for a ruling to recognise a Malaysian branch (permanent establishment) as the holder of the two participations, which would have exempted them from Luxembourg wealth tax. That ruling was refused on abuse of law grounds in August 2016. The authority subsequently also rejected the PE claim and recharacterised the shareholder loans as hidden equity.
The case ran through three rounds of litigation: the directeur (rejected 2022), the tribunal administratif (rejected 2024), and the Cour administrative (rejected April 2025). At every level, the authority’s positions were upheld.
The decision
The Luxembourg multi-factor debt/equity test
The Cour administrative set out the applicable test clearly. Recharacterisation of a shareholder loan as hidden equity (capital déguisé) is appropriate when the economic analysis of the instrument’s characteristics and the circumstances of its grant reveals that it is economically equivalent to a capital contribution, and that the loan form was chosen for fiscal rather than commercial reasons. The relevant factors, drawn from Luxembourg’s parliamentary history and consistent appellate jurisprudence, applied as follows:
- No interest rate fixed. The loan was zero-interest — a departure from the core economic characteristic of debt.
- No repayment schedule. No fixed schedule was set — the main legal formality of a loan was absent.
- Funds used for long-term fixed assets. The proceeds funded infrastructure participations, a mismatch between short-term debt and long-term use.
- Severe undercapitalisation. The structure was 99.998 per cent debt / 0.002 per cent equity — no independent creditor would lend into it.
- No security or guarantees. The loans were unsecured, supporting equity characterisation.
- Stapling clause. Mandatory prepayment on any change of shareholding made the loan inseparable from the equity — a strong equity indicator.
- IFRS 9 partial reclassification. (A) had itself reclassified a portion of the loans as an equity reserve in its accounts, acknowledging their equity character.
No single factor is decisive. The court applies a global assessment. Here the balance was clear: the absence of any interest rate — in isolation the most fundamental departure from the legal form of a loan — was compounded by severe undercapitalisation (99.998 per cent debt), long-term use of proceeds, absence of guarantees, and the stapling clause. The court also noted that (A) itself had reclassified part of the loans as an IFRS 9 equity reserve in its own accounts. On the facts, no independent creditor operating in market conditions would have provided this financing.
Contested factors — what the taxpayer argued
(A) advanced several arguments against recharacterisation, all dismissed. It argued that an 85:15 debt/equity ratio was standard 2015 market practice for comparable holding structures — the court held the relevant question is not what ratio other groups used but what an independent creditor would have accepted from (A) specifically. It argued that the formal 10-year maturity pointed toward debt — but the group had in practice rolled the loans by issuing new 10-year instruments, making economic maturity effectively indefinite. It argued that the absence of conversion or voting rights pointed toward debt — the court found these were outweighed by the cumulative equity indicators. And it argued that under Lux GAAP the instruments would have been debt — the court held that fiscal classification follows economic substance, not commercial accounting treatment.
ajiho commentary
What this adds to Luxembourg FTTP practice
First, the court confirms that a zero-interest loan is not automatically disqualified from debt treatment — it is one of many factors. But it is a very heavy factor. The absence of any interest is the most fundamental departure from the economic characteristics of debt, and it requires correspondingly strong countervailing indicators to survive challenge. In practice, zero-interest loans to Luxembourg entities from related parties should be treated as presumptively equity-like unless the specific circumstances provide a compelling commercial explanation.
Second, the 85:15 debt/equity ‘market practice’ defence explicitly failed. This is significant because Luxembourg’s pre-2020 practice — endorsed in a 2011 circular — had accepted up to 85 per cent debt funding as a working benchmark for intragroup financing. The court did not accept that the existence of a market norm substitutes for a case-specific arm’s length analysis. Groups that have relied on 85:15 as a structural rule of thumb should review their Luxembourg financing structures in light of the OECD’s 2020 Chapter X guidance, which the court implicitly endorses in requiring a borrower-specific credit analysis.
Cross-reference to the Austrian Health & Beauty case
The Luxembourg capital déguisé framework is closely related to the Austrian verdecktes Eigenkapital (hidden equity) doctrine examined in the library’s FT Case on Austria Health & Beauty AG (BFG GZ RV/7100946/2016, 2025). Both jurisdictions apply a multi-factor economic substance test with similar factors. The key difference is that Luxembourg’s analysis is grounded in economic equivalence to a capital contribution and the absence of independent creditor behaviour, while Austria’s three-stage test places particular weight on documentation, signed agreements, and repayment terms. Both approaches converge on the same result: undocumented, zero-rate, indefinitely-rolled funding of long-term fixed assets by shareholders will be treated as equity.
What this means for your business
Groups using Luxembourg holding or financing vehicles — which is most PE, real estate, and infrastructure fund structures in Europe — need to understand when a shareholder loan to a Luxembourg entity will be recharacterised as equity, and what the consequences are. Two priorities follow. Treat zero-interest shareholder loans as presumptively equity-like: if the arm’s length position genuinely supports a low or nil rate, that position needs to be documented with a borrower-specific analysis, not asserted by reference to a market norm. And do not rely on the historic 85:15 debt safe harbour as a structural rule of thumb — the question is what an independent creditor would have lent to the specific borrower given its actual capital structure and financial profile. Existing Luxembourg structures funded by shareholder debt should be reviewed against the Chapter X borrower-specific credit standard the court has now effectively endorsed.
Case reference
(A) S.à r.l. v Administration des Contributions Directes · Cour administrative du Grand-Duché de Luxembourg · N° 50602C du rôle · ECLI:LU:CADM:2025:50602 · 17 April 2025
Judgment in French. Final appellate decision in Luxembourg. Access via the Luxembourg Cour administrative portal (justice.public.lu).