The Sociedad de Responsabilidad Limitada ([SL](/en/glossary/sociedad-limitada)) is by far the most widely used corporate form in Spain for businesses of all sizes, accounting for more than 85% of mercantile companies registered at the Central Commercial Registry (Registro Mercantil Central). Its popularity reflects a combination of flexibility, liability limited to the capital contributed, and suitability for single-shareholder and multi-shareholder structures alike. This guide sets out the prerequisites, the steps in the incorporation process, the actual costs for 2026 and the obligations that arise the moment the company is registered.
What an SL Is and Why It Is the Default Corporate Form in Spain
The Sociedad de Responsabilidad Limitada is governed by Royal Legislative Decree 1/2010, of 2 July, approving the consolidated text of the Companies Act (Ley de Sociedades de Capital — LSC). Its essential characteristics are:
- Limited liability: shareholders are not personally liable for the company’s debts, except in specific cases of director liability for breach of duty or piercing the corporate veil (Arts. 236–241 bis LSC).
- Share capital divided into participations: unlike the Sociedad Anónima (SA), SL participations are not freely transferable. The LSC provides for statutory restrictions on transfer (Arts. 107–112 LSC), giving shareholders greater control over who enters the capital.
- Flexible management structure: the company may be managed by a sole director, two joint or several directors, or a board of directors. The formal requirements that apply to an SA’s managing director do not apply here.
- No mandatory minimum capital above €1: since Ley 18/2022, of 28 September, on Company Formation and Growth (Ley Crea y Crece), the minimum share capital was reduced from €3,000 to €1.
The usual alternative is to operate as a sole trader (empresario individual), which requires no corporate formation but does not separate the owner’s personal and business assets. Where the risks of the activity justify that separation, or where multiple shareholders are involved, the SL is the natural choice.
Prerequisites for Incorporating an SL
Before beginning the process, four fundamental questions must be resolved.
Founding Shareholders
An SL may be incorporated by a single shareholder (Sole-Shareholder SL — SLU) or by two or more shareholders, with no statutory cap on numbers (though the articles may limit them). Shareholders may be natural persons (residents or non-residents in Spain, regardless of nationality) or legal entities (domestic or foreign).
Non-resident shareholders must obtain a Foreigner Identification Number (NIE) before signing before the notary. The NIE is applied for at the immigration office or the Spanish consulate in the country of residence. The process can take between two weeks and three months when managed from abroad — making it one of the most frequent bottlenecks in incorporations with foreign shareholders.
Share Capital
The minimum share capital is €1 since October 2022 (Art. 4 bis LSC, inserted by Ley 18/2022). It must be fully subscribed and paid up at the time of incorporation, either in cash (bank deposit) or through non-cash contributions.
Non-cash contributions (real estate, machinery, intellectual property rights, receivables) are not subject to the independent expert report required for an SA (Art. 63 LSC), but shareholders are jointly and severally liable for the reality and valuation of what was contributed for five years (Art. 73 LSC). In practice, non-cash contributions complicate the notarial process and must be carefully documented.
Objects Clause
The objects clause defines the activities the company is authorised to carry out. It must be determinate, possible and lawful (Art. 23.b LSC). An overly restrictive objects clause can require amendment of the articles when the business diversifies, at additional cost. The standard practice is to draft a broad objects clause covering the principal activity and a residual provision permitting any lawful activity not expressly excluded.
Registered Office
The registered office determines which Commercial Registry is competent for the company’s registration. It must be located in Spanish territory, at the place of the company’s main administration and effective management or where its principal establishment is located (Art. 9 LSC). It may be set at the director’s home address or at a purpose-registered domiciliation address. The fiscal address for AEAT purposes may differ from the registered office.
Share Capital: The Impact of the Ley Crea y Crece
Ley 18/2022 introduced new Art. 4 bis into the LSC, permitting incorporation with as little as one euro of share capital. However, where capital is below €3,000, the company is subject to two restrictions:
- Mandatory 20% statutory reserve: in each year with profits, the company must allocate 20% of the positive result to the statutory reserve until the combined capital and reserve reach €3,000 (instead of the standard 10% under Art. 274 LSC, which applies once capital exceeds that figure).
- Dividend distribution limitation: if the statutory reserve has not yet reached the minimum threshold, only the net surplus after that 20% allocation may be distributed.
In practice, €1 of capital creates real friction: some banks require minimum share capital to open a corporate account; certain corporate clients include share capital as a solvency criterion in their supplier approval processes; and the AEAT has intensified checks on companies with negative or inadequate net equity. For most activities, starting with €3,000 of capital — which remains in the company as working capital — is the most pragmatic decision.
Steps for Incorporating an SL: Standard Route and CIRCE Route
The incorporation process has two main variants: the standard route (full notarial procedure) and the CIRCE route via an Entrepreneur Support Point (PAE).
Step 1: Company Name Certificate Application
The company name is the name under which the company will be registered at the Commercial Registry. To reserve it, a negative company name certificate (certificación negativa de denominación social) must be applied for at the Central Commercial Registry (RMC), confirming that no other company with that name is already registered. The certificate is issued within one to three working days and is valid for six months, renewable for a further six.
The name cannot match or be confusable with an existing registered name, and cannot include reserved terms (such as “bank”, “insurance” or “public”). Within the CIRCE system, this application is handled as part of an integrated process.
Step 2: Opening a Bank Account and Depositing Share Capital
The shareholders must open a bank account in the name of the company in formation and deposit the share capital. The bank issues a deposit certificate that the notary incorporates into the incorporation deed. Once the company is registered, the account passes into the ordinary control of the director.
The account opening process can be the slowest bottleneck: some banks require an in-person interview with the director, and for non-residents the process can take weeks. Certain payment institutions and digital banks can speed up the opening for companies in formation.
Step 3: Drafting the Articles of Association
The articles are the foundational constitutional document. They must include, as a minimum (Art. 23 LSC): the company name, objects, registered office, share capital and the nominal value of the participations, and the structure of the management body. Additionally, it is advisable to regulate — in the articles themselves or in a shareholders’ agreement — the rules on transfer of participations, the voting thresholds for material decisions, pre-emption rights on future capital increases and grounds for exclusion of shareholders.
Within the CIRCE system, the founder may choose the model articles approved by Order JUS/3498/2011, of 13 December, which simplify the process but cannot be customised.
Step 4: Execution of the Incorporation Deed before a Spanish Notary
The incorporation deed is the founding legal act of the company (Art. 22 LSC). It must be executed before a Spanish notary and must include: the identity of the founding shareholders, their intention to form an SL, each shareholder’s contribution, the articles of association and the identity of the initially appointed directors.
Under the CIRCE route, the deed is executed electronically and the theoretical timeline is 24–48 hours. Under the standard route, timing depends on the notary’s availability and the complexity of the transaction.
Step 5: Obtaining a Provisional Tax Identification Number from the AEAT
Once the deed has been executed and before registry filing, the company may apply for a provisional tax identification number (CIF) using Form 036, enabling it to begin operations. With the provisional CIF the company can invoice, enter into contracts and open accounts, although there are some practical limitations for transactions with certain public bodies.
Step 6: Stamp Duty (ITP-OS) Filing
The incorporation of a company has been exempt from Transfer Tax and Stamp Duty (in the corporate transactions — OS — form) since Ley 4/2008, of 23 December. However, filing Form 600 with the regional treasury of the autonomous community where the registered office is situated is mandatory, even where the resulting liability is nil.
Step 7: Filing at the Commercial Registry
The incorporation deed must be submitted to the Commercial Registry in the province where the company has its registered office. Under the CIRCE route, the notary submits it electronically and the Registry registers it on a priority basis. Under the standard route, the registration period ranges from 5 to 15 working days depending on the workload of the provincial registry.
Registry filing is constitutive: until that point the company exists as a company in formation (sociedad en formación), subject to a transitional legal regime (Arts. 36–38 LSC) under which those who contract in the company’s name are personally and jointly and severally liable for the obligations assumed.
After registration, the permanent CIF is issued to replace the provisional one.
Incorporation Deed and Commercial Registry: Practical Details
The incorporation deed is a public document registered at the Commercial Registry, which is a publicly accessible register. This means that the founding shareholders and the initial director are identified in a document accessible to third parties. If this public disclosure is a relevant factor, acquisition of a pre-formed company (sociedad preconstituida) is the alternative that allows operations without the shareholders appearing in the registry.
Once registered, the company must apply to file its first year’s annual accounts at the Commercial Registry within the month following approval by the General Meeting (which must be held within the first six months of the following financial year). Failure to comply results in registral closure and the inability to register subsequent acts, as well as potential ICAC penalties.
Post-Incorporation Obligations
Registry filing is not the end of the process. From that point, a series of tax, employment and company law obligations arise that must be addressed immediately.
Census Registration: Form 036
The census registration with the AEAT using Form 036 is the declaration of the company’s start of activity. It must be filed before any VAT-liable or Corporation Tax-liable operations begin. The same form identifies the IAE (Business Activity Tax) classification applicable to the principal activity.
IAE Registration
Companies are obliged to register under the IAE regardless of whether they are exempt from payment (companies with a turnover below €1 million are exempt from paying IAE but not from the registration obligation). IAE is administered by the AEAT or by the local authority, depending on the classification.
Director RETA Registration (Corporate Self-Employed)
The director of an SL who performs paid executive functions must register with the Special Regime for Self-Employed Workers (Régimen Especial de Trabajadores Autónomos — RETA) as a corporate self-employed person (autónomo societario), regardless of whether they are a majority or minority shareholder. Supreme Court case law and Social Security doctrine treat this obligation as equivalent to that of a standard self-employed person where the director has effective control of the company (a stake of 33% or more of the capital, or 25% or more if performing management functions).
The minimum contribution base and monthly contributions vary depending on projected income (under the net-income-based contribution system in force since 2023).
Mandatory Company Records
The company must legalise the following mandatory records at the Commercial Registry within the four months following the close of the financial year: minutes book (libro de actas), shareholders register (libro registro de socios), journal (libro diario) and inventory and annual accounts ledger (libro de inventarios y cuentas anuales) (Arts. 25 et seq. of the Commercial Code and Arts. 104 and 105 LSC for the shareholders register).
Breakdown of Incorporation Costs in 2026
| Item | Estimated amount |
|---|---|
| Company name certificate (RMC) | €18–25 |
| Notary fees (incorporation deed) | €300–650 |
| Commercial Registry fees (filing) | €100–250 |
| Stamp duty — OS (exempt but filing mandatory) | €0 |
| Share capital (minimum, retained in the company) | From €1 |
| Solicitor or agency fees (full management) | €400–1,500 |
| Total estimate (with €3,000 capital) | €1,200–3,500 |
The range depends on the complexity of the articles, the number of shareholders, the need for a shareholders’ agreement and the province of the Commercial Registry. The CIRCE route with model articles can reduce notary fees and processing costs, but does not eliminate registry fees or the costs of subsequent advisory.
Advisory costs are not optional if the company is to start on a solid footing: poorly drafted articles or the absence of a shareholders’ agreement are a common source of costly company disputes.
Standard SL, SLNE and Sole-Shareholder SL: When to Use Each
All three are variants of the Sociedad de Responsabilidad Limitada under the LSC, not distinct corporate forms.
Standard SL
The general variant. No restrictions on the number of shareholders, the objects clause or the company name. Appropriate for the vast majority of cases.
Sociedad Limitada Nueva Empresa (SLNE)
Regulated in Arts. 434–454 LSC, the SLNE was created as a simplified incorporation vehicle. Its restrictions are significant: the name must include the surnames and given name of one of the founding shareholders followed by an alphanumeric code; the objects clause is limited to a prescribed list of generic activities (commerce, industry, hospitality, etc.); and only natural persons may be shareholders at incorporation.
These restrictions have caused the SLNE to lose practical relevance. The online process available for a standard SL through CIRCE offers similar advantages without the SLNE’s limitations. In 2026, few advisers recommend this variant for new incorporations.
Sole-Shareholder SL (SLU)
The SLU is governed by Arts. 12–17 LSC. It is the natural structure for the individual entrepreneur who wants to operate with a legal personality separate from their own. The sole shareholder may be a natural person or a legal entity.
The sole-shareholder status must be declared at the Commercial Registry. Failure to do so within three months results in the sole shareholder being personally, unlimitedly and jointly and severally liable for the company’s debts incurred during the undeclared sole-shareholder period (Art. 14 LSC). This is one of the most frequent errors in practice and has serious consequences.
Where the SLU is managed by its sole shareholder, contracts between the shareholder and the company must be in writing and transcribed in the minutes book, with a reference in the notes to the annual accounts (Art. 16 LSC). Failure to observe this formality does not invalidate the contract, but can create problems of tax deductibility.
Common Mistakes in SL Incorporation
Experience in corporate formation advisory identifies a recurring set of errors with real impact on the life of the company.
Overly restrictive objects clause. An objects clause limited to the initial activity requires amendment of the articles when the business diversifies. An article amendment costs between €500 and €1,200 in notary and registry fees and requires a General Meeting resolution.
Standard articles without customisation. The CIRCE model articles are valid as a starting point but do not regulate key matters such as transfer of participations between shareholders, pre-emption rights, enhanced voting thresholds for material decisions or dividend distribution policy. These gaps generate disputes when shareholders disagree.
No shareholders’ agreement. The shareholders’ agreement (pacto parasocial) is the document that governs matters that should not appear in the public articles: vesting of participations, drag-along and tag-along provisions, valuation on exit, non-competition and non-solicitation. Many companies with multiple shareholders are incorporated without one, and problems emerge at the first serious disagreement.
Delaying director RETA registration. RETA registration must be filed before the start of activity or at the time of incorporation. Retrospective registration is possible but attracts surcharges and interest. Social Security has intensified cross-checks with the Commercial Registry.
Not updating the shareholders register. Any transfer of participations must be reflected in the shareholders register to be enforceable against the company. If the register is not updated, situations of dual ownership or shareholders exercising rights without being correctly registered can arise.
Insufficient share capital for the activity. Starting with €1 of capital may be legally valid, but in certain sectors (construction, private security, travel agencies, credit institutions) sector-specific regulations require higher minimum capital. In addition, persistent undercapitalisation can give rise to director liability in the event of insolvency.
Registered office at an unavailable address. The registered office must be a real address where the company can receive notifications. Using a collaborator’s address without formalising a domiciliation contract means the company may miss material notifications from the AEAT, the Commercial Registry or the courts.
How BMC Can Help with Your SL Incorporation
Incorporation is one of the legal acts with the greatest long-term impact on an entrepreneur’s life. Getting it right from the outset avoids correction costs, company disputes and tax problems that are typically more expensive than the initial advisory.
BMC manages the complete company formation process: from the company name reservation through to registry filing, census registration and RETA registration. For entrepreneurs and startups with several founders, our startup pack includes incorporation, drafting of the shareholders’ agreement, structuring of participation vesting and first-year tax advisory.
If speed is a determining factor — for example, you need a fully operational company within 48 hours for an imminent transaction — please consult our guide on the difference between incorporating from scratch and acquiring a pre-formed company.
For specific queries about the most appropriate structure for your situation, our corporate team offers an initial assessment consultation with no obligation.
Legal references:
- Royal Legislative Decree 1/2010, of 2 July (Ley de Sociedades de Capital, LSC) — consolidated text at the BOE
- Ley 18/2022, of 28 September, on Company Formation and Growth (Ley Crea y Crece) — BOE-A-2022-15832
- CIRCE portal of the Ministry of Industry — ipyme.org
- Central Commercial Registry — rmc.es
