Tax reform can sometimes have unexpected consequences. The reform affecting Luxembourg investment funds this summer could, in particular, make the world of reserved alternative investment funds (Raifs) a little less opaque.

Since 20 May, the Registration, Domains and VAT Administration (AED) has made available a database of identifiers specifically for Raifs. This database contains CSSF and ISIN codes, which enable, amongst other things, the identification of their sub-funds. The administration explains that it has centralised this information in preparation for the end, in August 2026, of a two-year transitional period concerning new subscription tax returns. Upon expiry of this period, the new forms will become mandatory and will require, amongst other things, the CSSF identifiers of the sub-funds to be provided.

On paper, the measure appears to be essentially administrative. It forms part of the modernisation of a tax that is declared and paid quarterly by Raifs, as well as by Ucits and specialised investment funds.

However, the database published to facilitate this transition has another benefit: it is beginning to map out a structured overview of a segment that is particularly important for Luxembourg’s private asset industry.

From the vehicle to the compartment

The distinctive feature is that it breaks the data down to the level of individual compartments. The file published by the AED links the Raif to their identifiers and to those of their various components. This level of detail makes it possible to distinguish, within a single structure, between several investment portfolios or strategies and to track their existence using standardised codes.

This is far from insignificant for Raifs. Established by the Act of 23 July 2016, this vehicle was specifically designed to provide a regulated framework without subjecting the fund itself to authorisation and direct supervision by the CSSF. To qualify for the scheme, however, the Raif must be an alternative investment fund and be managed by a fully authorised AIF manager. The legislation specifies that the Raiif is not subject to supervision by a Luxembourg supervisory authority.

This positioning has played a major part in its success amongst players in the private equity, private debt, property and infrastructure sectors. It also means that, unlike for certain categories of supervised funds, there was no public CSSF register enabling users to easily browse through the full range of products.

The AED itself points out that, for UCITS, specialised investment funds and SICARs, the identification numbers can already be viewed on the CSSF’s website. For Raifs, it is now the tax authorities that centralise and publish this information.

Read about how fund platforms are built

For an investor, a service provider or an observer of the financial market, the value therefore lies not so much in the CSSF number itself as in the comparisons that it makes possible.

A single Raif may house several sub-funds in succession. Their names may provide information about a strategy, an asset class, a geographical region or, in some cases, an investment ‘vintage’. A succession of sub-funds sharing the same structure may thus indicate the gradual development of a fund platform.

This trend is already evident in other publicly listed funds. Bellavista Feeder Fund II, a Sicav-Raif registered with the RCS and established in late 2016, for example, comprises several sub-funds, each with its own LEI identifier, including “BCEF V”, “Brep Europe VI”, “PECP V” and “Keensight V”.

Taken in isolation, each of these records reveals very little. When brought together within a single framework, however, they provide a clearer picture of the platform-based model underpinning part of the private equity industry. This is precisely what the standardisation of identifiers can facilitate on a larger scale.

By regularly cross-referencing the new codes with documents published in the Electronic Register of Companies and Associations (Resa), prospectuses, the names of investment vehicles and the service providers involved, it becomes possible to identify more systematically the series of sub-funds created by a single sponsor.

A name containing “Direct Lending”, “Infrastructure”, “Secondaries”, “Co-Investment” or even a year of establishment is obviously not enough to define a fund’s strategy. However, it can serve as an initial indicator to check in the vehicle’s legal documentation.

For private debt, infrastructure, follow-on funds or co-investments, this new layer of data could therefore prove to be a particularly useful screening tool.

Transparency that is still not perfect

However, the new map should be treated with caution. The AED itself emphasises the limitations of the database. The information is drawn from external sources and is published ‘to the best of our knowledge’. The administration does not guarantee its accuracy, completeness or timeliness. It is also considering producing a second, updated version should new information be provided by the sector.

Some dates also need to be interpreted. Where the authority does not know the launch date of a sub-fund, it conventionally enters 1 January 1980. For sub-funds considered to be operational, a notional closing date of 31 December 2500 is used.

This last piece of information is not in itself sufficient to automatically classify a sub-fund as active: the AED recognises that some sub-funds that are no longer operational may retain this status if their closure has not been reported to it.

In other words, the database is neither a regulatory register of Raif nor a perfectly up-to-date snapshot of the market. However, it does constitute a body of data that did not previously exist in this form.

A side effect of the reform

The irony is that this insight into the private equity industry was not the reform’s primary objective. The new system for reporting the subscription tax was launched in July 2024. For two years, the old and new systems coexisted. This transitional period is due to end at the end of August 2026.

The reform aims, in particular, to provide greater guidance to declarants, automate certain processes and facilitate the management and monitoring of declarations. The standardised identification of compartments forms part of the additional data required for this system.

In seeking to better identify what needs to be declared to the tax authorities, Luxembourg is therefore, almost as a side effect, developing a tool that makes it easier to monitor what is taking place within Raif.

It will take several updates to determine the full scope of this new source. Its true value will become apparent, in particular, when observers are able to compare the different versions of the database: new codes, missing compartments, new series and the emergence of designations corresponding to certain strategies.

Ultimately, the key indicator may no longer be simply the registration of a new Raif in the commercial register. It could lie one level lower, in the discreet launch of its next sub-fund.