On 22 February 2019, the director of the Luxembourg direct tax authorities released a circular (Circulaire L.G. - n°19, hereafter the "Circular") on criteria contained in the new provisions of §16, alinea 5 of the Adaptation Law of 16 October 1934 (Steueranpassungsgesetz, hereafter "StAnpG") allowing one to determine the existence of a permanent establishment in a State with which Luxembourg has concluded a double tax treaty ("DTT"). §16 alinea 5 of the StAnpG has been introduced by the Law of 21 December 2018, which mainly implements the Anti-Tax Avoidance Directive (please read our Tax Alert of 18 December 2018 on this topic). The purpose of the Circular is to clarify divergent interpretations that may arise when determining the existence of a permanent establishment ("PE"), either under domestic law or under double tax treaties.
Interaction between domestic law and double tax treaties
As a preamble, the Circular recalls that checking the existence of a PE requires meeting the criteria set forth in §16, alinea 1 of the StAnpG, according to which "a permanent establishment within the meaning of the tax law is every fixed piece of equipment or place, which serves for the operation of an established business." In case such analysis is related to a PE located in a State with which Luxembourg has concluded a DTT, the verification should be grounded on the criteria set by the relevant DTT. However, different approaches may be taken by the parties to the DTT, leading to situations of either double taxation or double non-taxation.
The Circular explains that in the case of double taxation, the mutual agreement procedure ("MAP") as enshrined in the OECD Model Tax Convention should allow one to solve interpretation issues.
Regarding double non-taxation situations, the Circular refers to article 23A.4. of the OECD Model Tax Convention, which provides that the exemption method set forth in article 23A.1 "should not apply to income derived or capital owned by a resident of a Contracting State where the other Contracting State applies the provisions of the Convention to exempt such income or capital from tax." Such provisions have been introduced in more than 40 DTTs that Luxembourg has concluded. Similar wording should be included in most DTTs concluded by Luxembourg upon the entry into force of the Multilateral Instrument to Implement Tax Treaty Related Measures to Prevent Base Erosion Profit Shifting ("MLI"), since Luxembourg clearly opted for the application of such provisions when signing the MLI back in June 2017. Since the MLI was adopted on 25 February 2019 and should be published in the Memorial in the coming days, the entry into force should be expected on either 1 June or 1 July 2019.
Relevant criteria and evidence to justify the existence of a PE
Based on §16; alinea 5, in the case of an enforceable DTT between two States, a taxpayer from one State may rely on the existence of a PE in the other State only based on the criteria set forth in the enforceable DTT but should also evidence that the activities carried out in the other State constitute on its own an independent activity and represent a participation to the general economic life. This documentation requirement is mandatory for the DTTs that do not include provisions of article 23A.4 of the OECD Model Tax Convention while it remains upon request for the ones that do include such provisions.
If the taxpayer fails to provide the documentation, the tax authorities will consider that the taxpayer does not have a foreign PE.
The confirmation could take any form to the extent sufficient to substantiate the declarations or representations of a taxpayer. Among other things, it could take the form of either a tax assessment issued by a competent tax office or a certificate issued by the competent authority.
The Circular has been warmly received, since it provides further guidance on the unclear provisions implemented by the Law of 21 December 2018 implementing the Anti-Tax Avoidance Directive. Taxpayers with foreign operations need to prepare for mandatory or upon-request documentation requirements to substantiate the existence of their PE. Our tax experts at Baker McKenzie Luxembourg would be happy to assist you should you require any further information in this respect.
 § 16, alinea 5 StAnpG provides "by way of derogation from the provisions of paragraphs 1 to 4, the only criteria to be applied in determining whether a resident taxpayer has a permanent establishment in a State with which Luxembourg has concluded an agreement for the elimination of double taxation in tax matters are the criteria used for this purpose in this agreement. In this respect, a resident taxpayer is considered to be carrying on business in whole or in part through a permanent establishment in the other Contracting State if that activity taken alone constitutes an independent activity and represents a participation in the general economic life in that State, unless an explicit provision contained in the Convention for the Elimination of Double Taxation in Tax Matters between Luxembourg and the other Contracting State precludes it. For the purposes of this paragraph, the taxpayer may be required to provide confirmation that the other Contracting State considers that a permanent establishment exists. Such confirmation is to be provided in the event that the agreement for the elimination of double taxation in tax matters entered into with the other State does not contain any provision authorizing Luxembourg not to exempt from taxation income received or property held in the other Contracting State by a resident taxpayer where the other Contracting State interprets the provisions of the agreement in such a manner that such income or that property falls within the scope of a provision of the Convention which removes or limits the right of the other Contracting State to impose those elements." (Unofficial translation)
 Double Tax Treaties implementing the MLI are mentioned as "Covered Tax Agreements" or CTAs.
 Second constitutional vote on 25 February 2019. In principle, all government bills and parliament bills must undergo two successive votes by the Chamber on the law as a whole. There must be an interval of at least three months between the two votes. However, parliament may exempt itself from the second vote only with the agreement of the Council of State, which is most often the case in practice. The refusal of the Council of State may occur when the text voted is incompatible with constitutional order, with the standards of international law or European Union law or with the general principles of law.
 to be distinguished from the entry into effect (please read our tax Alert released on 28 February 2019).