Luxembourg has established itself as the investment fund capital of Europe — and for good reason. With more than 3,900 regulated funds and over USD 5.7 trillion in assets under management, it ranks second only to the United States as a global fund domicile. For private equity firms, family offices, and in-house counsel advising multinationals, Luxembourg offers a combination of regulatory credibility, tax efficiency, and structural flexibility that no other European jurisdiction can fully replicate.
This guide moves beyond the basics of company formation. Rather than covering the standard SARL or SA — the go-to structures for operating businesses — it focuses on the three fund structures that international investors and asset managers most commonly use when setting up an investment vehicle in Luxembourg: the SICAR, the SIF, and the RAIF. WVT’s attorneys and tax advisors have structured funds and holding vehicles across all three, often in combination with a SOPARFI holding layer. What follows is a practical guide to understanding the differences, the regulatory landscape, and the key decisions involved.
Why Luxembourg Leads in Alternative Investment Funds
The appeal of Luxembourg as a fund domicile goes far beyond its favourable tax treaties. The Grand Duchy has spent decades building an institutional infrastructure specifically designed for cross-border investment structures. The Commission de Surveillance du Secteur Financier (CSSF) is one of Europe’s most experienced fund regulators and is known internationally for its pragmatic, responsive approach to authorisation and supervision.
Luxembourg was among the first jurisdictions in the EU to implement the Alternative Investment Fund Managers Directive (AIFMD), and it remains the preferred home for UCITS funds distributed across Europe. The country’s legal framework accommodates the full spectrum of asset classes — from private equity and venture capital to real estate, infrastructure, and hedge funds — through purpose-built vehicle types that balance investor protection with operational flexibility.
For PE firms and family offices specifically, Luxembourg’s treaty network covering more than 80 countries, combined with access to EU passporting, makes it the most efficient starting point for multi-jurisdictional investment platforms. When a structure needs to hold assets in the Netherlands, Germany, or the UK while raising capital from investors in the US, the Middle East, or Asia, Luxembourg provides the connectivity and legal certainty to make that work.
Choosing the Right Fund Structure: SICAR, SIF or RAIF?
The three most relevant fund vehicles for private investors and alternative asset managers in Luxembourg each serve a distinct purpose. Choosing between them requires an analysis of the asset class, the investor base, the desired timeline to launch, and the level of regulatory involvement the manager is prepared to accept.
| SICAR | SIF | RAIF | |
| Target investors | Sophisticated investors (risk capital) | Well-informed investors | Well-informed investors |
| CSSF approval | Required | Required | Not required |
| Launch timeline | 4–6 months | 3–5 months | 6–10 weeks |
| Subscription tax | Exempt | 0.01% p.a. | 0.01% p.a.* |
| Min. investment | € 125,000 | € 125,000 | € 125,000 |
| Eligible assets | Risk capital / PE / VC | All alternative assets | All alternative assets |
* RAIF structured under the SICAR regime is exempt from subscription tax.
SICAR — Société d’Investissement en Capital à Risque
The SICAR was designed specifically for risk capital investments, making it the natural home for private equity and venture capital strategies. Luxembourg-domiciled PE managers operating through a SICAR benefit from a full exemption from subscription tax and an income tax exemption on qualifying income derived from transferable securities held as risk capital. To qualify, the fund must invest in risk-bearing assets — broadly defined, but centred on equity or quasi-equity participation in companies at all stages of development.
The SICAR requires CSSF authorisation before launch, which typically takes four to six months. The minimum qualifying investor threshold is EUR 125,000, and investors must meet the “well-informed investor” standard. A licensed depositary bank is required, and the fund must be managed by an authorised Alternative Investment Fund Manager (AIFM).
SIF — Specialised Investment Fund
The SIF is the broadest of the three vehicles in terms of eligible assets. Unlike the SICAR, the SIF has no restriction to risk capital — it can hold real estate, infrastructure, debt instruments, fund-of-funds positions, and virtually any other alternative asset class. This flexibility makes it the preferred vehicle for multi-strategy family offices and diversified alternative investment platforms.
Like the SICAR, the SIF requires CSSF approval and an authorised AIFM. It is subject to a 0.01% annual subscription tax on net assets, with certain exemptions available depending on the investor base and asset type. Launch timelines are comparable to the SICAR at three to five months, assuming documentation is complete and the CSSF application is well-prepared.
RAIF — Reserved Alternative Investment Fund
The RAIF was introduced in 2016 specifically to address the speed-to-market challenge that PE managers and fund promoters face with the SICAR and SIF. The defining characteristic of the RAIF is that it does not require direct CSSF authorisation. Instead, regulatory oversight is exercised indirectly through the requirement that the fund must at all times be managed by a fully authorised EU AIFM.
This structure reduces launch time to as little as six to ten weeks, since no CSSF approval process is needed for the fund itself. The RAIF is available in both a general regime (subject to 0.01% subscription tax) and a SICAR-equivalent regime (exempt from subscription tax, restricted to risk capital assets). For managers who already hold an AIFM licence — or who appoint an existing licensed AIFM as their management company — the RAIF represents the fastest route to a regulated Luxembourg fund structure.
The SOPARFI as a Holding Layer
Many fund structures in Luxembourg incorporate a SOPARFI (Société de Participations Financières) as an intermediate holding vehicle between the fund and its portfolio investments. The SOPARFI is a standard Luxembourg commercial company — typically structured as an SA or SARL — that benefits from Luxembourg’s full participation exemption regime.
Under this regime, dividends received from qualifying subsidiaries and capital gains on the disposal of qualifying shareholdings are fully exempt from Luxembourg corporate income tax, provided certain conditions relating to holding percentage, holding period, and subsidiary qualification are met. This makes the SOPARFI a highly efficient vehicle for managing portfolio company exits within a PE or family office structure.
In practice, WVT’s attorneys and tax advisors frequently structure SICAR or RAIF vehicles alongside one or more SOPARFI holding companies, particularly where the fund holds operating businesses in multiple jurisdictions or where transaction-level tax efficiency at exit is a priority. The combination creates a two-tier structure: the fund vehicle for capital pooling and regulatory compliance, and the SOPARFI for individual portfolio company ownership and exit planning.
Regulatory Requirements and the Role of the CSSF
Understanding what the CSSF requires — and what it does not — is critical for fund managers planning their Luxembourg setup. For SICAR and SIF vehicles, the CSSF must approve the fund before it launches. This process involves submitting a detailed application including the fund documents (offering memorandum or prospectus, articles of incorporation or partnership agreement), information on the investment strategy and risk profile, details on the AIFM, and due diligence on key service providers including the depositary and the administrator.
The CSSF is generally accessible and its review periods are predictable when applications are well-prepared. Incomplete or under-documented applications are the primary cause of delays. Engaging legal counsel with direct CSSF experience significantly reduces timeline risk.
For RAIF structures, the regulatory process is concentrated at the AIFM level. The fund itself is not CSSF-supervised, but the authorised AIFM who manages it is subject to full AIFMD compliance, including risk management requirements, reporting obligations, and substance requirements. A RAIF also requires a Luxembourg-licensed depositary bank.
All three structures — SICAR, SIF, and RAIF — must comply with Luxembourg’s AML/KYC framework, maintain proper accounting records, and file annual audited financial statements. Given the increasing scrutiny of substance requirements across the EU, fund promoters should also ensure that governance activities — board meetings, investment decisions, and management oversight — are meaningfully connected to Luxembourg.
Tax Considerations Specific to Luxembourg Fund Structures
The tax treatment of Luxembourg fund structures differs materially from that of standard operating companies, and it is one of the primary drivers behind Luxembourg’s competitive position as a fund domicile.
The SICAR benefits from a broad income tax exemption covering income and gains from securities held as risk capital, including dividends, interest (in certain circumstances), and capital gains on disposal. This exemption makes the SICAR particularly attractive for private equity strategies where the primary return is through equity appreciation and exit proceeds.
The SIF and the RAIF (under the general regime) are subject to a 0.01% annual subscription tax calculated on the fund’s total net assets. While nominally a tax, in practice this is a minimal cost for funds of any meaningful size and is substantially offset by the exemption from corporate income tax and withholding tax that both vehicles enjoy.
Luxembourg’s extensive double tax treaty network — covering over 80 countries — is a practical tool for managing withholding taxes on portfolio income. Combined with the EU’s Parent-Subsidiary Directive and Interest and Royalties Directive, Luxembourg fund structures can be engineered to minimize friction at the portfolio company level across a broad range of European and non-European jurisdictions.
Tax advisors at WVT typically analyse treaty access, substance requirements, and exit structuring concurrently during the fund design phase, rather than as a post-launch consideration. The earlier this analysis is integrated into the fund documentation, the more options remain available to the manager and its investors.
Setting Up Your Luxembourg Fund: Timeline and Key Steps
The practical sequence for establishing a fund in Luxembourg follows a well-established path, though the timeline differs significantly depending on whether CSSF approval is required.
For a SICAR or SIF, the process typically begins with the legal structuring phase — selecting the vehicle type, legal form (LP, SA, SCA, SARL), and governance structure. This is followed by drafting the fund documents, appointing service providers (AIFM, depositary, administrator, auditor), and preparing the CSSF application. The CSSF review period is typically two to four months for well-prepared applications. Total time from mandate to launch is generally four to six months.
For a RAIF, the absence of direct CSSF oversight compresses the timeline considerably. Assuming an authorised AIFM is already in place, the fund can be launched within six to ten weeks of completing the legal documentation and executing the notarial deed. The speed advantage is most relevant for PE managers responding to a deal opportunity with a hard deadline, or for family offices that want to establish a vehicle without committing to a multi-month regulatory process upfront.
Key milestones across all three structures include:
- Legal structuring and jurisdiction analysis
- Draft fund documentation (PPM / prospectus / limited partnership agreement)
- AIFM appointment and due diligence on service providers
- Depositary bank onboarding and account opening
- CSSF application (SICAR/SIF) or notarial deed execution (RAIF)
- Registration with the Luxembourg Trade and Companies Register (RCS)
- Investor KYC/AML clearance and first capital call
How WVT’s Attorneys and Tax Advisors Support Your Luxembourg Fund
WVT advises PE firms, family offices, and international investors on the full lifecycle of Luxembourg fund structures, from initial structure selection through CSSF authorisation, ongoing regulatory compliance, and cross-border transaction support.
Our attorneys and tax advisors have hands-on experience structuring SICAR, SIF, and RAIF vehicles, as well as SOPARFI holding layers for portfolio company ownership and exit planning. WVT works particularly closely with clients whose investment strategies span multiple jurisdictions — combining a Luxembourg fund vehicle with Dutch, Belgian, or UK holding structures, and managing the tax and regulatory interface between them.
Clients typically engage WVT at the fund design stage, where early involvement in vehicle selection, treaty analysis, and substance planning creates the most value. We also advise on investor negotiations, side letter arrangements, carried interest structures, and management company setup for managers seeking full AIFM authorisation.
If you are considering establishing a fund or holding structure in Luxembourg, WVT’s attorneys and tax advisors are available for an initial consultation to assess the most appropriate structure for your investment strategy and investor base.
Frequently Asked Questions
What is the difference between a SICAR and a RAIF in Luxembourg?
The SICAR is a CSSF-regulated fund vehicle restricted to risk capital investments, offering a full income tax exemption on qualifying securities. The RAIF, by contrast, requires no direct CSSF authorisation — oversight is exercised through its authorised AIFM — which dramatically reduces launch time. Both structures require a minimum investor commitment of EUR 125,000 and a licensed depositary bank, but the RAIF is typically preferred when speed to market is a priority and the manager already has an AIFM in place.
How long does it take to set up a fund in Luxembourg?
Luxembourg fund setup timelines depend primarily on the vehicle chosen. A SICAR or SIF requires CSSF authorisation, which typically adds two to four months to the process — bringing total launch timelines to four to six months from mandate. A RAIF bypasses direct CSSF approval and can be launched in six to ten weeks, assuming an authorised AIFM is appointed and fund documentation is prepared efficiently. WVT’s attorneys and tax advisors actively manage the critical path to avoid the documentation gaps that most commonly cause delays.
Can a non-EU fund manager set up a fund in Luxembourg?
Non-EU managers can establish and operate a Luxembourg fund, though the regulatory pathway depends on the chosen structure. For SICAR and SIF vehicles, a non-EU manager must appoint an authorised EU AIFM to manage the fund — either an independent third-party AIFM or a Luxembourg management company affiliated with the manager’s group. The same applies to RAIF structures. Alternatively, non-EU managers operating above the AIFMD threshold may seek AIFM authorisation directly in Luxembourg, which requires establishing a substantive presence and meeting the full CSSF authorisation requirements.
What is a SOPARFI and when should it be used alongside a fund structure?
A SOPARFI is a Luxembourg holding company that benefits from the participation exemption regime, under which dividends and capital gains from qualifying shareholdings are exempt from Luxembourg corporate income tax. It is commonly used as an intermediate holding layer between a Luxembourg fund vehicle and its portfolio companies, particularly where the fund holds operating businesses in multiple jurisdictions. WVT’s attorneys and tax advisors typically recommend a SOPARFI structure when transaction-level tax efficiency at exit is material to the overall return — a common consideration in PE and real estate fund structures.
