One of the most consequential decisions you make when forming a Luxembourg RAIF happens before you accept a single euro of commitments: the tax election. You must choose whether your RAIF will be taxed under the SIF regime or the SICAR regime. It is not reversible. It goes into your constitutional documents, it determines your ongoing tax obligations, and it shapes how your investors model their returns.
I have seen managers get this wrong, usually because their legal counsel defaulted to one option without fully modelling the other. The stakes are not trivial. For a EUR 50 million fund, the difference between the two regimes can mean tens of thousands of euros in annual tax costs and a meaningfully different after-tax return profile for your LPs.
The two regimes
The RAIF Law (Law of 23 July 2016) gives you a binary choice at formation [1]:
SIF-like tax treatment. The RAIF is exempt from corporate income tax (IRC), municipal business tax (ICC), and net wealth tax (IF). Instead, it pays an annual subscription tax (taxe d'abonnement) of 0.01% of net assets [2]. This subscription tax is calculated quarterly and paid to the Administration de l'Enregistrement, des Domaines et de la TVA (AED). There are no restrictions on investment strategy; you can invest in anything.
SICAR-like tax treatment. The RAIF is subject to the general Luxembourg tax regime: corporate income tax (currently 24.94% combined rate in Luxembourg City), municipal business tax, and net wealth tax. However, income and capital gains from "qualifying securities" are fully exempt [3]. Qualifying securities broadly means investments in risk capital: equity, quasi-equity, and certain debt instruments in portfolio companies that meet the risk capital definition. The result is that a RAIF invested purely in qualifying venture capital or private equity positions pays effectively zero tax. There is no subscription tax [3].
Running the numbers
The economics are straightforward once you understand what goes into each bucket.
SIF-like RAIF at EUR 50 million NAV: 0.01% subscription tax = EUR 5,000 per year. No income tax on any gains, regardless of asset type. The tax is payable whether the fund makes money or not, since it is based on net assets, not performance.
SICAR-like RAIF at EUR 50 million NAV, fully invested in qualifying risk capital: Zero subscription tax. Zero income tax on qualifying income and gains. Total annual tax = zero.
SICAR-like RAIF at EUR 50 million NAV, with EUR 5 million in non-qualifying investments (e.g., interest income from cash deposits, gains on listed securities, management fees earned if the RAIF also acts as a management vehicle): Income from non-qualifying sources is taxed at the full corporate rate. The combined corporate income tax and municipal business tax rate in Luxembourg City is approximately 24.94%. So EUR 200,000 of interest income on cash deposits would generate roughly EUR 49,880 in tax.
The subscription tax on a SIF-like RAIF is capped. Certain share classes or sub-funds may qualify for a reduced rate or exemption. Institutional share classes investing in money market instruments can benefit from a reduced 0.005% rate, and certain pension fund structures are fully exempt [2]. But for a standard private equity or venture capital fund, 0.01% is the rate.
When SIF-like treatment wins
SIF-like treatment is the safer, more predictable choice in several scenarios:
Diversified strategies. If your fund invests across asset classes (private equity, real estate, infrastructure, credit) and not all investments qualify as risk capital under the SICAR definition, SIF-like treatment avoids the risk of partial taxation. You pay 0.01% on everything and nothing else, regardless of the asset mix.
Real estate funds. Luxembourg real estate funds almost always choose SIF-like treatment. Rental income and property gains would not qualify as risk capital income under the SICAR regime, so they would be subject to full corporate taxation. The 0.01% subscription tax is far cheaper.
Funds of funds. If you are investing in other funds rather than directly in portfolio companies, the character of your income depends on what the underlying funds invest in. SIF-like treatment removes that uncertainty.
Cash management concerns. If your fund is expected to hold significant cash balances (e.g., during the investment period of a large fund), the interest income on those balances would be taxable under the SICAR regime. Under SIF-like treatment, it is simply captured in the 0.01% net asset base.
When SICAR-like treatment wins
SICAR-like treatment is optimal when the fund's income is almost entirely from qualifying risk capital investments:
Pure venture capital and private equity. If you invest exclusively in equity and quasi-equity positions in private companies, and your only income comes from capital gains on exits and dividends from portfolio companies, everything qualifies. Zero subscription tax, zero income tax.
Concentrated portfolios. Funds with fewer positions have an easier time ensuring all investments qualify. A 10-company venture portfolio is simpler to manage from a SICAR qualification perspective than a 50-position diversified fund.
Larger funds. The subscription tax is proportional to NAV. A EUR 500 million RAIF under SIF-like treatment pays EUR 50,000 per year in subscription tax. Under SICAR-like treatment with a qualifying portfolio, it pays nothing. At that scale, the savings are material and accumulate over the fund's life.
What qualifies as "risk capital"
The definition of risk capital is the critical question for anyone considering SICAR-like treatment. The CSSF has defined risk capital through Circular 06/241 [4] and subsequent guidance, including recent updates published in 2025 [5]. The definition covers:
- Direct or indirect contributions to entities with the aim of their launch, development, or listing on a stock exchange.
- The risk element must be present: the investment must carry a genuine risk of loss, not be a disguised loan or guaranteed return structure.
- Shares, profit-participating loans, convertible instruments, and similar quasi-equity instruments in portfolio companies generally qualify.
- Senior secured debt, government bonds, publicly traded securities, and cash equivalents do not qualify.
The practical risk is at the margin. If your fund makes a bridge loan to a portfolio company, is that risk capital? What about a SAFE or a convertible note? These instruments are common in venture capital, and the SICAR qualification is not always obvious. You need your Luxembourg counsel to confirm the treatment of each investment type in advance, not after deployment.
The election is permanent
I want to be very clear about this: the tax election is made at formation and cannot be changed during the life of the fund [1]. If you choose SIF-like treatment and later realise your portfolio would have qualified for SICAR-like treatment, you are locked in. If you choose SICAR-like treatment and later make investments that do not qualify as risk capital, those investments are taxed at full rates.
I always tell managers to model both scenarios with their tax adviser before signing constitutional documents. Run the numbers with your actual target portfolio, not a generic assumption. Factor in cash balances, management fee income (if the fund is also the management vehicle), and the expected mix of qualifying and non-qualifying positions.
Umbrella structures and mixed elections
One question that comes up regularly: can you have different tax elections for different sub-funds within an umbrella RAIF? The answer is yes, if the RAIF is structured as a SICAV or SICAF with multiple compartments. Each compartment can independently elect SIF-like or SICAR-like treatment [1]. That works well if you plan to run multiple strategies under one umbrella: a venture capital compartment with SICAR-like treatment and a real estate compartment with SIF-like treatment, for example.
For most emerging managers running a single fund, this is academic. But if you are thinking about your platform long-term (Fund I in venture, Fund II potentially in a different strategy), structuring your first fund as a compartment within an umbrella can save time and money when you launch the next vehicle. The umbrella is already established; you just add a new compartment with its own terms, investors, and tax election.
The trade-off is complexity. An umbrella structure requires more sophisticated fund documentation, and the administrator needs to maintain separate accounting for each compartment. For a first-time manager with one strategy and one fund, a standalone SCSp is simpler and cheaper. Save the umbrella for when you need it.
Withholding tax and treaty access
One additional factor: Luxembourg's extensive double tax treaty network applies differently depending on the structure. A RAIF structured as a corporate entity (SICAV or SICAF) with SICAR-like treatment is generally eligible for treaty benefits, which can reduce withholding taxes on dividends and interest from portfolio companies in treaty countries. A transparent RAIF (SCSp) is treated as a partnership for tax purposes, and treaty access depends on the treaty eligibility of the underlying investors [2].
For a venture fund investing primarily in EU startups, this may not matter much because the EU Parent-Subsidiary Directive often eliminates withholding on dividends between EU entities. But for funds investing in US, Asian, or other non-EU markets, treaty access can be a material factor in the tax election decision.
Practical checklist for the election
Before you sign your constitutional documents, I recommend running through this list with your tax adviser:
- What percentage of your target portfolio will consist of qualifying risk capital investments? If it is under 90%, SIF-like treatment is probably safer.
- How much cash will the fund hold on average during the investment period? Interest income on cash is taxable under SICAR-like treatment.
- Will the fund earn management fees directly (as opposed to through a separate management company)? Fee income is not risk capital income.
- Where are your portfolio companies domiciled? If outside the EU, model the withholding tax impact under both elections.
- What is your expected NAV over the fund's life? Calculate the cumulative subscription tax under SIF-like treatment and compare it to the expected corporate tax under SICAR-like treatment on any non-qualifying income.
How we help at Infra One
We work with emerging managers on the operational side of fund formation, including setting up the ongoing tax compliance processes that the chosen regime requires. Our fund administration platform handles NAV calculations that feed the subscription tax computation for SIF-like RAIFs, and we coordinate with your tax advisers to ensure the correct reporting for SICAR-like structures.
If you are forming a Luxembourg RAIF and want to think through the tax election with someone who has seen both sides, get in touch. We work alongside your legal and tax counsel to make sure the operational setup matches the structural choice.
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