Sole trader (ENI) vs Portuguese Lda: which is right for your business?

For the complete guide to running a Sociedade por Quotas once incorporated, see the Portuguese Lda: complete guide.

Terminology note: in this guide, “self-employed worker” (trabalhador independente) refers to the general Social Security enrollment for freelancers, service providers and liberal professionals. “ENI in the strict sense” is a subcategory with commercial activity as a titular de empresa individual, carrying a higher contribution rate and broader protection. Many “ENIs” in everyday usage are, for Social Security purposes, general self-employed workers rather than ENI in the strict sense. Where the distinction matters (Social Security), it is flagged.

The three forms in a nutshell

Before the comparison table, a quick explanation of each:

• Empresário em Nome Individual (ENI). The individual person carries out economic activity in their own name. There is no separate legal person; the business and the person are the same legal subject. Income is subject to IRS (Category B). This is the natural format for someone starting an individual activity (freelancer, consultant, small service) with low risk and moderate volume.
• Sociedade Unipessoal por Quotas (single-member Lda). A commercial company with a single member, provided for in articles 270-A and following of the Portuguese Commercial Companies Code (CSC). It creates a legal person separate from the individual, with its own assets. It is generally subject to IRC, with the important exception of the fiscal-transparency regime (see dedicated section). This is the natural next step for someone who wants asset separation while remaining a single-founder structure.
• Sociedade por Quotas (multi-member Lda). Same structure but with two or more members (articles 197 and following of the CSC). The choice when there is more than one owner, structured around the articles of association (pacto social), quotas, management, and minutes. Throughout this guide the pacto social is referred to as the “articles” after the first mention.

The two corporate formats (single-member and multi-member Lda) share almost everything in terms of obligations; what differs is the minimum number of members and some specific rules for the single-member form (rules on contracts between the sole member and the company, among others).

Comparison table

Personal liability: the structural difference

The most consequential divergence between ENI and the two corporate forms is personal liability. In an ENI, the business and the individual are the same legal subject. If the business incurs debts, creditors can seize the individual’s personal assets: personal bank account, home, car, savings. There is no separation.

In the two corporate forms (single-member Lda and multi-member Lda), the company is a separate legal person from its member, with its own assets. Company debts are met from the company’s entire assets, not merely from the share capital. For Sociedades por Quotas, article 197(1) of the CSC provides that members are jointly liable to the company for the payment of all contributions agreed in the articles (not each member only for their own quota, but all members for all contributions). Article 198 then allows the articles to include, as an optional clause, the direct liability of one or more members to company creditors, up to a specified amount. Beyond that, there are situations in which managers or the member themselves can be personally liable:

• Manager liability for acts performed with intent or fault (CSC, arts. 72 and following).
• Subsidiary manager liability for tax debts under article 24 of the Lei Geral Tributária (LGT). This is not automatic: the law distinguishes between debts whose tax event occurred during the manager’s tenure and debts whose legal payment deadline fell within it, with different burdens of proof.
• Abuse of the corporate form (piercing the corporate veil, in exceptional situations).

The general principle is asset separation. For a business with material risk (potential debts, complex contractual obligations, litigation exposure), that separation may by itself justify moving to a corporate form. For a simple, low-risk individual activity (consulting, training, professional services), the personal-asset exposure may be acceptable.

Tax regime: IRS vs IRC

The tax regime is the second big decision axis.

ENI: IRS Category B. ENI income is taxed under IRS, in Category B (business and professional income), aggregated with the individual’s other income. The ENI can be under the simplified regime or under organized accounting (enrollment and transition rules are covered in the next section). Under the simplified regime, a coefficient set out in article 31 of the CIRS is applied to gross income to determine taxable income. The most common coefficients:

• 0.15 for sales of goods and products, and for services under hotel and similar activities, restaurants and beverages (with an express exception for local-accommodation activity operated as a house or apartment, which follows its own regime);
• 0.75 for income from professional activities listed in the article 151 table of the CIRS (lawyers, architects, consultants, and many others);
• 0.35 for other services not covered by the categories above.

Under the 0.75 and 0.35 coefficients, part of the presumed expense margin is automatic and the rest is conditional on substantiated expenses reported to the AT (under article 31 of the CIRS as currently in force). It is therefore not a regime entirely without deductible expenses: part of the deduction requires proof. Organized accounting, by contrast, determines the taxable profit as income less actual deductible expenses recorded in the accounts, and allows more granularity in specific scenarios.

Single-member Lda and multi-member Lda: IRC (with an important exception). Companies are generally taxed under IRC on the taxable profit derived from organized accounting. The general rate for 2026 is 19% in mainland Portugal (under Law 64/2025 of 7 November, with a progressive reduction to 18% in 2027 and 17% in 2028). For SMEs and small mid caps, the first €50,000 of taxable base is taxed at 15% (article 87 of the CIRC). Municipal and, where applicable, state surtaxes are added.

The exception: the fiscal-transparency regime. Article 6 of the CIRC provides that certain companies (in particular professional companies whose activity is one of those listed in the article 151 table of the CIRS, plus a few others) calculate taxable income under IRC rules, but that income is attributed to their members and taxed in the members’ IRS or IRC, regardless of any actual distribution. A single-member Lda whose main activity is a professional service may therefore fall under fiscal transparency, which materially changes the tax comparison against ENI. Before choosing a single-member Lda, it is essential to confirm with the accountant whether the planned activity falls in this regime, because the effective tax result may end up very close to that of an ENI.

Comparing IRS and IRC rates directly is misleading: the regimes have different calculation bases, and fiscal transparency, when it applies, further shifts the picture. The useful comparison is at the net-income-after-all-taxes level, and it depends on turnover, actual expenses, the individual’s household tax status, whether the company falls under fiscal transparency, and the company’s profit-distribution policy. For the detail of the two central annual filings under IRC (Modelo 22 and IES), see the dedicated guide.

Bookkeeping and filing obligations

ENI on the simplified regime. A regime designed to keep things simple: no organized accounting, no mandatory certified accountant, with IRS Modelo 3 annex B, and VAT in the applicable regime. Low administrative cost. Even so, many ENIs choose to work with an accountant to avoid errors on IRS and VAT (not a legal requirement, but a common practical choice).

ENI on organized accounting. Enrollment in the simplified regime depends on turnover: article 28 of the CIRS provides that a taxpayer already enrolled in the simplified regime is moved to organized accounting when they either exceed €200,000 in gross income in two consecutive years, or exceed it in a single year by more than 25% (i.e. above €250,000). The change to organized accounting takes effect in the following tax year. It is also possible to elect organized accounting voluntarily, even below the thresholds. Organized accounting requires IRS Modelo 3 annex C, a certified accountant, VAT, and more elaborate tax reporting.

Single-member Lda and multi-member Lda. Always on organized accounting, with a certified accountant required. Requires annual Modelo 22 for IRC, annual IES (which also handles accounts deposit at the Commercial Registry and reporting to AT, IRN, INE, and the Banco de Portugal), periodic VAT returns, withholdings, RCBE, and annual approval of the accounts, documented in minutes: in a multi-member Lda through a general meeting; in a single-member Lda the sole member exercises those powers and documents the decision in minutes. This is the highest administrative cost of the three formats.

For the full month-by-month tax and legal calendar of a Portuguese Lda, see the tax and legal calendar (2026).

Social Security

ENI / self-employed worker. A person carrying out activity in their own name is enrolled in the self-employed workers’ regime at Social Security. Two notes on the contribution rate: for self-employed workers in the general sense (most individual service providers, commonly referred to in everyday usage as recibos verdes), the rate is 21.4%; for ENI in the strict sense (holder of an individual commercial establishment), the rate is 25.2%, in exchange for broader protection (including unemployment benefit). The calculation base is a relevant income figure: under the simplified regime it is derived by Social Security quarterly from invoicing; under organized accounting it is generally based on the prior year’s taxable profit, unless the taxpayer elects the quarterly system.

The start of contributions for first-time enrollment is deferred: the contribution obligation begins only on the first day of the 12th month following commencement. Once that deferral ends, the obligation becomes regular. The calculation base and the monthly minimum depend on which assessment method applies to the relevant income, set out in article 163 of the Contributory Regime Code:

• Quarterly assessment (default, applicable to those on the IRS simplified regime): Social Security calculates relevant income from the invoicing declared each quarter. If it falls below the minimum, a relatively modest monthly minimum contribution applies (at very low income, in practice around €20 per month).
• Annual assessment (typically applicable to those on organized accounting, unless quarterly is elected): the monthly contribution base has a minimum equal to 1.5 IAS, derived from the prior year’s taxable profit, making the monthly minimum significantly higher than under quarterly assessment.

Beyond the minimum, there are situations in which a self-employed worker is exempt from the contribution obligation: (i) concurrent dependent employment that already secures sufficient contributory enrollment, within the applicable income and coverage conditions; (ii) being a pensioner under a qualifying pension; or (iii) an automatic exemption granted by Social Security in the following year, when the worker had nil or very low income (with the contribution capped at the minimum) and the statutory conditions remain met. The specific situation should be confirmed with Segurança Social Direta or the accountant.

Single-member Lda and multi-member Lda. Company managers are, as a rule, enrolled as statutory-body members (MOE) in the general Social Security regime (articles 61, 66 and 69 of the Contributory Regime Code), with contributions calculated on the remuneration paid by the company and a monthly minimum equal to 1 IAS. The applicable rates are 23.75% for the company and 11% for the manager, withheld from the remuneration. Two practical situations to distinguish: (i) concurrent dependent employment or being a pensioner with a pension that meets the article 66 conditions can remove the 1-IAS minimum-base requirement without excluding the manager from the regime; (ii) full exclusion from the MOE regime typically requires absence of manager remuneration and qualifying contributory coverage via another route. Specifics should be confirmed case by case.

Setup and maintenance costs

In 2026:

• ENI: setup is free (activity-start declaration at Finanças). The monthly accounting and administrative cost depends on the regime: very low under simplified (often nil in accounting fees, or occasional fees only); regular accountant fees under organized accounting. These ranges refer only to the cost of administering the activity and do not include the tax and Social Security component (IRS, VAT, Social Security), which depends on actual income.
• Sociedade Unipessoal por Quotas: setup via Empresa Online at €220 with pre-approved articles or €360 with articles drafted by the applicants; via Empresa na Hora, around €360. Maintenance: certified accountant (mandatory), taxes and contributions. The Certidão Permanente costs €25 for a one-year subscription; it is the most practical way to share up-to-date official data with banks and clients, but it is not a strict annual obligation (the commercial registry itself remains in force even if the Certidão subscription is not renewed, though third-party access to it stops).
• Sociedade por Quotas (Lda): costs analogous to the single-member Lda.

Actual numbers vary with business complexity, the accountant, and the company’s internal policies. The structural difference is that an ENI on the simplified regime has significantly lower maintenance cost than any company.

When does each form make sense?

There is no universal rule, but some criteria help:

Choose ENI when:

• The activity is individual, with low risk of debts or litigation.
• Projected turnover is comfortably below €200,000.
• The goal is to start fast, with minimal administrative cost, to test viability.
• There is no immediate need to hire a team, receive investment, or present a corporate face to clients or banks.

Choose Sociedade Unipessoal por Quotas when:

• One person is behind the business, but the activity has material risk (potential debts, contractual obligations, litigation exposure) and asset separation is valuable.
• Projected turnover justifies the cost of organized accounting and, in a full numerical comparison (including the effect of any applicable fiscal transparency), IRC comes out more efficient than aggregated IRS.
• The business needs corporate credibility (larger contracts, licensing, banking relationships, potential investment).

Choose Sociedade por Quotas (multi-member Lda) when:

• There is more than one member in the business.
• The same considerations as the single-member Lda apply, together with the need to clearly define each member’s rights in the articles (participation, management, quota transfers, special rights). For the anatomy of the articles themselves, see the pacto social guide.

In any case, a practical step before deciding: a short conversation with a certified accountant, with realistic numbers for the first 12–24 months. The most common pitfalls are choosing ENI for a business that will quickly cross the simplified-regime thresholds (€200,000 in gross income for two consecutive years, or €250,000 in a single year; either of which triggers a move to organized accounting in the following year), or setting up a company too early, paying structural costs the activity does not yet support.

Moving from ENI to Lda as the business grows

Many businesses start as ENI and move to a corporate form once one of the thresholds becomes unavoidable: higher personal-asset risk, volume that justifies IRC, an incoming member, investor conversations, or greater credibility with clients. The transition is not automatic: it requires incorporating the company (Empresa Online or Empresa na Hora), reorganizing the activity onto the new entity (which typically means assigning, novating or re-contracting agreements with clients and suppliers, and formally transferring assets, with the tax considerations that come with each), and ceasing the ENI activity at Finanças. A certified accountant is central to this transition.

The reverse path (closing the company and returning to ENI) is less common but possible. It involves company dissolution, asset liquidation, and cancellation of the corporate registration, followed by a new activity-start declaration in the individual’s name.

This article is for information only. The choice between ENI, Sociedade Unipessoal por Quotas, and Sociedade por Quotas depends on specific factors of the business, the individual, and the market. Before deciding, consult a certified accountant with realistic figures for the first 12–24 months of the activity.