A flexible alternative for structuring investments
A participation association agreement (associação em participação) is governed by Decree-Law No. 231/81 of 28 July and allows one person—the participant (associado)—to participate in the results of an economic activity carried out by another—the managing participant (associante).
Participation in profits constitutes an essential element of the agreement, whereas participation in losses may be excluded by agreement between the parties.
Unlike a commercial company, a participation association agreement does not involve the incorporation of a separate legal entity nor, as a rule, the creation of a separate estate. This feature largely explains the flexibility of this legal instrument and its use in investment and co-investment transactions.
In the real estate sector, for example, it is possible to structure a transaction whereby an investor contributes capital towards the acquisition, development or promotion of a property, while contractually becoming entitled to participate in the project’s results, without the need to acquire an equity interest in the development company.
Contribution or financing?
One of the first tax issues is determining the true nature of the contribution made by the participant.
Where the participant makes funds available to the managing participant, it is essential to distinguish between a genuine contribution made under a participation association agreement and a simple financing transaction.
The distinction is particularly relevant for Stamp Duty purposes.
The legal characterisation will not depend solely on the title given to the agreement, but above all on its economic substance. A transaction involving an unconditional obligation to repay the capital together with predetermined remuneration may resemble financing, whereas a structure in which the participant’s return genuinely depends on the results of the business activity displays different characteristics.
Accordingly, the proper drafting of the agreement is of particular importance.
Taxation of an individual participant
Where the participant is an individual, the income derived from a participation association agreement is expressly classified by the Portuguese Personal Income Tax Code as investment income (Category E).
Where such income is derived in Portugal and paid by an entity maintaining organised accounting records, it is, as a general rule, subject to final withholding tax at a rate of 28%.
This interpretation was confirmed by the Portuguese Administrative Arbitration Centre (CAAD) in Case No. 272/2024-T, in which it was held that profits distributed to an individual acting as a participant under a participation association agreement were subject to final withholding tax at the time of payment.
For private investors, this classification may make a participation association agreement a relatively straightforward tax-efficient mechanism for participating in the results of a particular project.
Nevertheless, a fundamental distinction must be drawn between the income earned by the investor and the repayment of the initial contribution made.
Repayment of capital is not necessarily taxable income
This issue assumed particular importance in an arbitration decision of 20 April 2026, rendered in Case No. 991/2025-T, concerning a participation association agreement used in a real estate transaction.
In that case, the Portuguese Tax Authority had treated the entire amount received by the participant as investment income.
The Arbitral Tribunal, however, took a different view. It held that the repayment of the participant’s initial capital contribution does not, in itself, constitute investment income. Only the portion corresponding to the actual profit or economic return obtained by the participant should be subject to taxation.
Accordingly, where an investor contributes €200,000 to a particular project and ultimately receives €260,000, it should not automatically be concluded that the entire amount of €260,000 constitutes taxable income. A distinction must be drawn between the repayment of the €200,000 initially invested and the €60,000 representing the economic return generated by the investment.
Although an arbitral decision is binding only in the specific case in which it is rendered, this interpretation is particularly relevant for the tax structuring of participation association agreements used in real estate projects.
What if the participant is a company?
Where the participant is a legal entity subject to Portuguese Corporate Income Tax (IRC), the tax treatment differs.
The Portuguese Corporate Income Tax Code provides for a specific economic double taxation relief mechanism in respect of income distributed to the participant, provided that the statutory requirements are met.
The rationale is straightforward: the profits arising from the business activity are first determined and taxed at the level of the managing participant (associante), after which part of those profits is allocated to the participant.
Consequently, the tax treatment of a participation association agreement may vary significantly depending on whether the investor is an individual or a corporate entity.
For this reason, the choice of the investment vehicle should be carefully assessed before the agreement is entered into.
Particular relevance in real estate investments
Participation association agreements may prove particularly attractive in real estate transactions where an investor wishes to participate economically in a project without acquiring a direct shareholding in the development company.
They allow the parties, among other matters, to contractually define the investor’s contribution, the percentage of participation in the project’s results, the costs to be taken into account when calculating those results and the conditions governing the repayment of the invested capital.
However, these are precisely the areas in which the principal tax risks also arise.
The agreement should clearly identify:
- the value and nature of the participant’s contribution;
- the method for determining the project’s results;
- the costs to be considered in that calculation;
- the point at which the participant becomes entitled to share in the profits;
- the manner in which the initial contribution is to be repaid; and
- the portion representing the participant’s actual economic return.
Poorly drafted agreements may make it difficult to distinguish between capital and income and increase the risk of the Portuguese Tax Authority recharacterising the transaction.
Participation Association Agreement or Collective Investment Undertaking?
In projects involving multiple investors, the question may arise as to whether a participation association agreement remains the most appropriate structure or whether a collective investment undertaking should instead be considered.
The differences are substantial.
A participation association agreement is essentially a contractual relationship between the participant (associado) and the managing participant (associante), offering considerable flexibility in defining the economic terms of the investment.
Collective investment companies, by contrast, are subject to a specific regulatory framework, currently established under the Portuguese Asset Management Regime (Regime da Gestão de Ativos), and are supervised by the Portuguese Securities Market Commission (CMVM). They are also subject to specific rules governing their incorporation, management, investor protection and operation.
Their tax regime is likewise different, with Portuguese collective investment undertakings benefiting from the specific rules set out in Articles 22 and 22-A of the Portuguese Tax Benefits Code (Estatuto dos Benefícios Fiscais).
Accordingly, a participation association agreement may prove suitable for a specific project or for a limited number of investors, whereas structures intended to raise and collectively manage capital require a broader regulatory and tax analysis.
The experience of Belzuz Abogados, S.L.P.’s Tax Department
The Tax Department of Belzuz Abogados, S.L.P. has extensive experience advising both domestic and international clients on the tax analysis and structuring of a wide range of investment models in Portugal, including real estate investment transactions, co-investment structures and contractual mechanisms for sharing the results of business projects.
In these matters, it is common to assess different alternatives, including direct equity investments, financing arrangements, participation association agreements and, in larger projects involving multiple investors, collective investment vehicles.
Practical experience demonstrates that these structures are not tax equivalent.
The investor’s tax residence and legal status, the duration of the investment, the remuneration mechanism, the level of risk assumed, the treatment of the repayment of capital and the nature of the underlying assets may significantly affect the tax treatment of the transaction.
For this reason, tax analysis should accompany the legal structuring of the investment from the outset, ensuring that the contractual framework adopted is consistent with the parties’ economic objectives while reducing potential future tax contingencies.
Conclusion
A participation association agreement is a flexible legal instrument for structuring investments and may be particularly attractive in the context of real estate transactions.
However, its contractual flexibility also requires careful tax analysis.
The distinction between a capital contribution and financing, between the repayment of capital and taxable income, as well as the tax treatment of the participant under Portuguese Personal Income Tax (IRS) or Corporate Income Tax (IRC), may lead to significantly different tax consequences.
Recent tax arbitration case law clearly demonstrates that the way in which the agreement is structured and the project’s results are determined may have a direct impact on the taxation of the transaction.
Accordingly, the legal, tax and accounting structuring of the agreement should precede the investment itself. To this end, investors and developers may rely on the experience of the Tax Department of Belzuz Abogados, S.L.P. in the analysis and implementation of investment structures, including real estate transactions and participation association agreements.