How to set up an SL in Spain step by step (2026 guide)

TL; DR

Setting up an SL in Spain in 2026 means completing eleven legal steps ranging from name certification to registration in the provincial Mercantile Registry. How to set up an SL in practice combines two speeds: the traditional way to set up an SL (certification, bank account, notary's office, Mercantile Registry and census registration with form 036) which is resolved in two or three weeks for about €250-500 in official expenses; and the CIRCE/PAE telematic route, capable of leaving the SL operational in 24-48 hours thanks to the Single Electronic Document. Law 18/2022 "Create and Grow" also allows the incorporation of an SL with only €1 of share capital, although it imposes additional reserves and responsibilities up to €3,000. At Ibercenter, after accompanying hundreds of entrepreneurs in the process of registering and domiciling their new SL, we have organized the entire process into eleven blocks so that anyone who wants to know how to set up an SL without any surprises has every decision – and every invoice – under control.

What exactly is an SL and why is it the preferred legal form in Spain?

At Ibercenter, after accompanying hundreds of entrepreneurs in the process of registering and domiciling their new SL, we see that most of the projects that land at our headquarters in Gran Vía, Azca and Velázquez arrive with the same question before any other: what type of company is best for them before considering how to set up an SL. The answer, in more than 80% of cases, ends up being a Limited Company. It is no coincidence. The SL is the legal form designed for SMEs, early-stage startups, subsidiaries of foreign groups and self-employed workers who need to make the leap to a corporate structure without assuming the rigidity or cost of a Public Limited Company.

An SL, or Limited Liability Company, is a legal entity with its own personality, distinct from that of its partners. This means that the partners are liable for the company's debts only with the capital contributed – except in cases of extended liability – and that the company can sign contracts, hire staff, acquire real estate or request financing itself. Compared to the self-employed, it provides patrimonial shielding. Compared to the SA, it provides agility: very low minimum capital since the Create and Grow Law, more flexible governing bodies and taxation more adapted to medium-sized projects. And compared to less common forms such as Civil Society or SLU, it offers a professional ecosystem (consultancies, notaries, judges, statute templates) that is well rounded.

When someone asks us why they should consider how to set up an SL instead of remaining self-employed, the answer is on three fronts: fiscal (from a certain level of profit, Corporate Income Tax is paid off against Personal Income Tax), reputational (invoicing with corporate CIF usually opens doors with large clients and foreign subsidiaries) and operational (allows you to incorporate partners, distribute dividends, succession planning). It is not an aesthetic decision; It is a business architecture decision that should be made well informed and, in most cases, accompanied by a tax or commercial advisor who validates the fit.

What prerequisites must be clear before setting up an SL?

Before embarking on paperwork and starting to set up a proper SL, at Ibercenter we recommend stopping for 48 hours and validating five basic issues. The first is the number of partners: an SL can be constituted with a single partner (then it is called a Single-Person Limited Company or SLU) or with several. When there is more than one partner, the conversation about percentages, roles and exit clauses cannot be postponed; it is the root of 90% of the corporate conflicts that we see after three or four years. The second is the contribution of capital: monetary, non-monetary (real estate, machinery, valued intellectual property) or mixed. Each modality has different practical and fiscal implications.

The third issue is the corporate purpose, that is, the activity – or activities – that the company will carry out. Drafting it too narrowly forces you to modify the statutes every time the business is expanded; Writing it too openly can complicate operations with banks, licenses or certain sector registries. The fourth issue is the company name: you have to have a name chosen – and several alternative ones – because the Central Mercantile Registry rejects those that coincide or are too similar to others already registered. And the fifth is the registered office, which will determine which provincial Mercantile Registry is competent and before which Tax Agency a large part of the procedures will be carried out.

This last point deserves attention when planning how to set up an SL with solvency. The registered office is not a mere administrative data: it is the official address that will appear in the Mercantile Registry, in the CIF, in the Treasury, in the Social Security and in any notification from a public body. Many entrepreneurs who have just set up an SL do not want to use their home – for privacy, image or community restrictions – and resort to a virtual office with a tax address in Madrid or a professional address in the centre. When that headquarters is in Gran Vía, Azca or Velázquez, in addition to legal compliance, it provides a commercial signal: foreign subsidiaries, investors and corporate clients give value to a CIF with the address of a consolidated financial district.

How do I apply for negative certification of name in the Central Mercantile Registry?

The first formal procedure when someone begins to constitute a real SL is to prove that the chosen name is available. This document is called a negative certification of denomination and is issued by the Central Mercantile Registry. "Negative" is not an unfortunate word: it means that the Registry certifies that there is no record – negatively – of any company with that name, and therefore it is reserved for the applicant. Without this paper, the notary does not authorise the deed, so it is the real starting point.

The application can be submitted online from the RMC website or in person and is the first paper needed by any project that wants to set up an SL in Spain. Up to five names can be proposed in order of preference; the Registry will check one by one until the first one that is free is found. The official rate is around €15-20 plus shipping. The certificate, once issued, reserves the name in favor of the applicant for six months and is valid before a notary for three months; If it expires before signing the deed, it must be renewed, which happens more often than it seems when partners get entangled in negotiating statutes. It is worthwhile, therefore, not to order it until you have the rest of the mature pieces.

A detail that we always provide to entrepreneurs who are looking for how to **set up an SL **without any surprises is to take care of the five names proposed. That they are different from each other, without generic words ("consulting", "solutions", "digital") alone, without references to regulated activities if that activity is not going to be carried out, and without fantasizing about names very close to well-known brands – the Registry rejects them and, even if it were to accept them, exposing oneself to an action for trademark confusion does not compensate. A good exercise: choose the dream name, choose two defensible alternatives, and add two slightly more creative "just in case." At Ibercenter we have seen projects lose two weeks for having proposed five variants of the same idea.

How are the bylaws drafted and what should the agreement between partners contain?

The bylaws are the internal regulations of the company. They define everything from something as seemingly banal as how a meeting is convened to something as transcendental as what majority is needed to sell the company. When someone searches for how to set up an SL online, they find dozens of free templates that "work". And they serve, in fact, for very simple cases: sole shareholder, standard activity, with no projection of the entry of new partners or investors. As soon as the project has ambition, those templates fall short and you have to spend time customizing them.

When someone is going to set up an SL, all the articles of association must include a minimum mandatory content: name, corporate purpose, domicile, share capital and the way in which it is distributed, administrative body (sole administrator, joint and several directors, joint and several directors or council), way of deliberating and adopting agreements, corporate year, and regime for the transfer of shares. From there, and especially when an SL is going to be set up with several partners, the "strategic" clauses come in: drag and support rights, anti-dilution clauses, ancillary benefits, reinforced majorities for critical decisions, dividend policy, conflict of interest regime of the director... Each clause is a commitment that binds to the future; it is advisable to think about them calmly.

When there is more than one partner, in addition to the statutes – which are public and remain in the Mercantile Registry – it is highly recommended to sign a parallel shareholders' agreement. This pact is not registered, it has effects only between signatories, and regulates issues that would not fit well in public statutes: exclusive dedication of the founders, vesting of shares, non-competition post-exit, dispute resolution clauses. At Ibercenter we recommend that all entrepreneurs with partners set aside a specific budget item for a commercial lawyer to draft tailor-made bylaws and shareholders' agreements; The cost, between €500 and €2,000 depending on the complexity, is recovered with the first conflict that is avoided.

What role does the bank account and the contribution of share capital play?

The next step in the classic order to set up an SL in Spain is to open the company's bank account – still in formation, i.e. without a definitive CIF – and pay the share capital. The bank will issue a bank certificate attesting to the deposit, and that certificate is provided to the notary at the time of signing. Without it, writing cannot be authorized. It is a seemingly simple procedure that has become a common bottleneck in 2026 for those who want to set up an SL quickly: banks are increasingly tightening the criteria of "know your customer" and prevention of money laundering, and opening an account for a company in formation whose partners are foreigners or whose activity is sensitive can take weeks.

Before Law 18/2022 "Create and Grow", anyone who wanted to set up an SL had to contribute a minimum paid-up capital of €3,000. Since the entry into force of that law, that minimum has been reduced to €1. It is the most celebrated novelty by the Spanish entrepreneurial ecosystem. However, it starts with small print: as long as the share capital is less than €3,000, the company must allocate at least 20% of the annual profit to a legal reserve until that figure is reached, and if the company is liquidated with debts, the partners are jointly and severally liable up to €3,000 of the difference between the effective capital and that figure. In practice, a "one-euro SL" has not been created at no real cost; a transitional regime has been created that defers the disbursement but does not exempt it.

Our recommendation, when an entrepreneur asks us whether to set up an SL with €1 or €3,000, is simple: if the project is clearly undercapitalized and the euro is the only thing available, go ahead with the "Create and Grow" modality; In any other scenario, contributing the €3,000 from minute one simplifies management and image in front of third parties (banks, suppliers, corporate customers). It also avoids the obligation of reinforced reserve and the small print of extended responsibility. The contribution can be monetary (transfer to the account of the company in formation) or non-monetary (real estate, equipment, patents), in which case a documented valuation is required and the partners assume responsibility for the veracity of this valuation.

How does the appointment before a notary and the public deed of incorporation work?

With the negative certification, the articles of association and the bank certificate in hand – or with the telematic equivalent if you opt for CIRCE – you go to the notary's office to sign the public deed of incorporation of the SL. The deed is the founding document of the company: it elevates it to a public instrument, incorporates the statutes, identifies the partners and their contributions, designates the administrative body and establishes the registered office. It is the legal milestone that marks the formal birth of the legal entity, although its full effectiveness against third parties is not consummated until registration in the Commercial Registry.

When considering how to set up an SL without delays, the choice of notary is not a minor detail. All notaries are public officials and apply the same official fees, but they vary in experience with company incorporations, calendar agility and willingness to work against the clock or telematically. The Notarial Association of Madrid offers an official search engine. In Madrid capital there are notaries specialized in companies that are used to attending to incorporations in two or three days from the request for an appointment. The notary fees for a standard SL incorporation range from €90 to €250 depending on capital and complexity, excluding VAT, depending on the current tariffs.

On the day of signing, all the partners (or their proxies with sufficient power of attorney) attend. The notary reads the deed, verifies identities, validates documentation provided and has the instrument signed. In the same act, powers of attorney can be granted to the administrator, the shareholders' book can be incorporated and the telematic submission to the Mercantile Registry can be requested, something that is increasingly common and highly recommended because it shortens the deadlines. If you have arrived with the previous work well done, the signature lasts between 30 and 60 minutes. If not, it can turn into a whole afternoon of corrections. One of the tips that entrepreneurs appreciate most when considering how to set up an SL is to prepare the draft deed with the notary 48 hours before and arrive only to sign.

How do I apply for the provisional and definitive NIF at the Tax Agency (form 036)?

Once the deed of incorporation of the SL has just been signed, the company needs to register with the Treasury. The first step is to apply for the provisional NIF by filing form 036 at the Tax Agency's electronic headquarters. This NIF will accompany the company for the first months, until registration in the Mercantile Registry leads to the assignment of the definitive NIF. With the provisional NIF, the company can now invoice, sign contracts, retain suppliers and operate normally, although it is recommended – when the volume allows it – to wait for the final one for demanding corporate clients.

Form 036 is not a mere administrative form within the process of setting up an SL. It is the census declaration in which the company communicates to the Treasury everything relevant: identification, tax domicile, representatives, applicable VAT regime, withholding obligations, IAE headings (even if companies do not pay IAE tax in the first two years if their turnover is less than one million euros, they are still obliged to declare the headings), intra-community operations (VIES/ROI), and any special regime that you wish to request. A form 036 that is poorly completed at the start can cause problems with VAT refunds, withholdings or exports for months.

For limited companies, the filing is always telematic and requires a digital certificate from the legal entity – which is obtained once it has a NIF – or a certificate from the legal representative. In practice, at Ibercenter we have seen many entrepreneurs who entrust form 036 to their tax advice precisely because of the number of boxes and technical decisions involved: general VAT regime, cash criterion, pro-rata rule, registration in the VIES if operating with European suppliers, lease retention obligations if an office rental contract is signed – which links to the choice of headquarters – or professionals. It is not a form to improvise in 15 minutes.

How is the company registered in the provincial Mercantile Registry?

Once the deed has been signed and the provisional NIF has been obtained, the next step in completing the constitution of an SL is registration in the Mercantile Registry of the province where the registered office is located. In Madrid, this competence falls to the Mercantile Registry of Madrid. Registration is what makes the company fully operational against third parties: until that moment the SL exists between the partners and against the Treasury, but it is not enforceable against third parties in good faith with all the force of a registered company. In practice, many banks, public tenders and corporate clients require the deed already registered before contracting.

The notary is usually in charge of the telematic presentation to the corresponding Registry, although more and more notaries include this service in the same act of signing. The Registrar verifies the legality of the content, checks the name, checks that the statutes do not contain clauses contrary to the law and, if everything is in order, proceeds to register. The usual deadlines in the Mercantile Registry of Madrid range between five and fifteen working days, although they can be extended if there are correctable defects. Registration fees depend on capital and are usually between €60 and €250 for a standard incorporation.

Once an SL has been completed with the registration, the simple note accrediting the registration is issued. With this simple note – and with the deed already stamped – the company can apply for the definitive NIF, open operational bank accounts, submit proposals to public tenders and appear as a fully operational company in any business database. At Ibercenter we recommend keeping digitized copies of the sealed deed, the nota simple and the original articles of association in a well-organized corporate repository from day one: they will be requested dozens of times throughout the life of the company (banks, insurance, supplier openings, due diligence processes, capital increases) and having them on hand saves weeks.

What are the obligations with Social Security and with the registration of administrators?

Setting up an SL does not end in the Mercantile Registry. The company and its administrators have to register correctly with Social Security, and here decisions are made with a very significant economic impact. The director of the company, if he or she has effective control (direct or indirect participation equal to or greater than 50%, or family positions that add up to control participation), must register in the Special Regime for Self-Employed Workers (RETA), in the form of corporate self-employed workers, with a minimum base higher than that of the ordinary self-employed and a subsidised fee during the first months if it is the first registration.

If the director does not have effective control but provides remunerated services to the company, he or she can be included in the General Regime as assimilated, with nuances that must be assessed on a case-by-case basis. And if there are also employees, the company must register as a contributing company in the General Regime, obtain the Contribution Account Code and register each worker before the effective start of their benefit. Each of these steps is carried out through the Social Security Electronic Office or the RED system, with a digital certificate of representation.

By constituting an SL, these decisions are not interchangeable or ambiguous: framing poorly generates regularizations and sanctions after three, five or seven years, when the Inspectorate detects the inaccuracy and claims differences with a surcharge. When someone asks us how to set up an SL in a calm way, we insist that the advice of a social graduate or an agency with a labour department is as important as that of the mercantilist: the saving of €200/month in miscalculated quota can become a claim of €15,000 years later. We have seen it several times in customers who came to our headquarters with that backpack.

What tax obligations does an SL have in its first year of life?

Once the process of setting up an SL has been signed, the company has no tax respite from day one. Its basic obligations begin with quarterly returns: VAT form 303, form 111 for withholdings of workers and professionals, form 115 for lease withholdings if the headquarters is rented – very relevant when signing with an office rental provider in Madrid – form 202 for instalment payments on account of Corporation Tax (although the first year does not always apply). Each quarter closes on the 20th (or 30th in the case of Q4) of the following month. Each omission opens a proportional fine.

At an annual level, the SL must file form 200 (Corporation Tax) within 25 calendar days following the six months following the end of the financial year, form 390 (annual VAT summary), form 190 (annual summary of withholdings of workers and professionals), form 180 if there were withholdings of leases, and deposit the annual accounts in the Mercantile Registry within the month following the approval by the general meeting — which in turn must be held within the first six months of the financial year. It is a dense calendar that becomes routine, but that does not forgive forgetfulness.

The corporate income tax rate for newly created entities is 15% in the first year with profits and in the following year, compared to 25% in general. This reduction is a real incentive to go from self-employed to SL when the project grows. In addition, if the company takes advantage of the "Create and Grow" modality with capital of less than €3,000, it must reflect at each closing the destination of 20% of profits to legal reserve until the gap is covered. At Ibercenter we recommend that any entrepreneur who considers how to set up an SL has tax advice from minute one: trying to save €100/month in management and discovering a fine of €3,000 after two years is a bad calculation by definition.

Via CIRCE/PAE or traditional route with a notary? When does each one compensate?

In 2026, two routes coexist to constitute an SL in Spain. The traditional route, which we have described step by step in the previous sections, lasts two to three weeks and has an official cost of between €250 and €500 (certification, notary, registry), not counting advisory or lawyer fees. It is the natural way when the statutes are complex, there are sophisticated shareholders' agreements, non-monetary assets are contributed or you want to personally choose a notary and timing. The second way is the CIRCE (Information Center and Business Creation Network), managed from the Entrepreneur Service Points (PAE).

The CIRCE system processes all the incorporation steps electronically through a single form, the Single Electronic Document (DUE). It automatically coordinates the Central Mercantile Registry, online notary's office, the Tax Agency, the Social Security Treasury and the provincial Mercantile Registry, with deadlines that in the ideal scenario can be reduced to 24-48 hours. Its advantages are obvious: speed and discounted cost (up to €60 in notary fees and up to €40 in registries for SL Express that meet requirements). Its limitations too: it works with model statutes, does not admit certain particularities and limits customization.

When does each one compensate? The CIRCE route is optimal for setting up an SL or SLU with standard statutes, monetary capital, sole shareholder or few partners without complex agreements, and unregulated activity. The traditional route is preferable when the corporate structure is complex, there are foreign partners who require apostilles or translations, valued assets are provided, specific clauses have to be negotiated, or it is simply preferred to work with a notary and trusted advisor. At Ibercenter we see both routes frequently: startups founded by two or three entrepreneurs usually go through CIRCE; Consultants or subsidiaries with international partners usually choose the traditional route. None is better by default; it depends on the project.

What are the most frequent mistakes when setting up an SL (and how to avoid them)?

After accompanying hundreds of entrepreneurs in the process of setting up an SL and domiciling it, at Ibercenter we have identified half a dozen mistakes that are repeated with disturbing frequency. The first is an overly restrictive corporate purpose: it is drafted thinking about the specific activity of the first year and after 18 months, when the company launches a new line, you have to go to the notary to modify the statutes with the associated cost. The second is a non-existent shareholders' agreement or signed years later with the relationship already deteriorated, when the agreement loses much of its preventive utility.

The third frequent mistake is to choose a poorly thought-out registered office: using the administrator's home – which then hinders operations and exposes personal data – choosing an address in a province other than the real place of work with the burden of having to travel for procedures or notifications, or using "virtual" addresses that do not meet the requirements required by the Treasury to consider the effective address. This is a point where professionalizing the headquarters from minute one with a virtual office with a tax address in the center of Madrid avoids many problems. We have also seen abuses with "convenience" addresses in which dozens of companies share management without a contract or real service, with the consequent scrutiny of the Administration.

The fourth mistake is to underestimate Social Security: registering the administrator under the wrong regime, not registering family collaborators, or delaying registration as a contributing company when the first worker is hired. The fifth is to forget to deposit the annual accounts in the Mercantile Registry, with the result that the company's sheet is closed in the registry and the following procedures are blocked. And the sixth – the quietest – is not having tax advice from the beginning and discovering after 18 months an accumulation of errors in 303, 111 and 200 that costs thousands of euros to regulate. All these mistakes are avoidable if you consider how to constitute an SL with the seriousness it deserves.

Where does the registered office fit in the whole process of setting up an SL?

The registered office is a piece that appears transversally in all the steps to constitute an SL and deserves its own section. It is essential information in the public deed, it conditions the province of the competent Mercantile Registry, determines which Tax Office manages the file, and appears in every official notification that the company receives throughout its life. Changing it later is possible but it involves a public deed, registration and communication to the Treasury; it is therefore advisable to choose it well from the beginning.

The three typical profiles that we attend to at Ibercenter when someone has just set up an SL are clear. The first is the entrepreneur who starts alone or with a partner and needs a professional address at the cost of a physical rental: the natural solution is a virtual office with correspondence reception, telephone service and meeting room on demand. The second is the SL that already starts with two or three people and looks for workspace from minute one: it fits better in coworking in the Azca area or coworking in Gran Vía, with flexibility to grow or reduce without ties.

The third is the professional SL – legal firm, consultancy, family office, foreign subsidiary – which wants a consolidated image from day one: it fits into executive offices or directly rents private offices in Barrio Salamanca, Azca or Gran Vía. In any of the three cases, the address appears in the deed, the Mercantile Registry and form 036 from the first moment, avoiding the inconvenience – and cost – of having to direct debit later. It is the operative brother of the specific article that we dedicate to how to direct deposit a new SL in Madrid step by step, where we delve into the available modalities.

Frequently asked questions about how to incorporate an SL in 2026

How long does it really take to set up an SL in 2026?

How long it takes to set up an SL depends on the route chosen. By the traditional route (certification of name, drafting of statutes, bank account, notary and Mercantile Registry), it is usually between two and three weeks from the first procedure to the firm registration. When the partners arrive with consensual bylaws, available capital and all the identification documentation prepared, it can be shortened to ten working days. When there are foreign partners who require an apostille, sworn translation or international powers of attorney, it can be extended to four or five weeks.

By the CIRCE/PAE telematic route with SL Express, the theoretical period can be reduced to 24-48 hours if the requirements are met (model statutes, Spanish partners with electronic signature, monetary capital, non-regulated activity). In practice, many projects that start with CIRCE take a week because minor incidents appear. The important thing is to be clear that "24 hours" is the best scenario, not the average, and plan the commercial start with a reasonable margin.

How much does it cost to set up an SL in Spain in 2026?

The official costs of a standard incorporation are usually between €250 and €500: negative certification of the name (~€15-20), notary fees for public deed (~€90-250 depending on capital and complexity), provincial Mercantile Registry fees (~€60-250 depending on capital), and some minor management expenses. To this is added the share capital contributed, which is no longer a cost but the company's assets (minimum €1 since the Create and Grow Law, although in practice the usual is still €3,000).

To this amount should be added, almost always, legal advice fees (commercial lawyer and/or agency), which range from €300 for very simple constitutions to €2,000 for constitutions with statutes and a personalized shareholders' agreement. When you opt for the CIRCE/PAE route with SL Express, the fees benefit from official discounts and the overall cost can be below €200. In any case, saving on professional advice when the structure has a certain complexity is usually a false economy that is paid for years later.

Is it mandatory to contribute €3,000 of share capital or is €1 enough?

Since the entry into force of Law 18/2022 "Create and Grow", it is possible to set up an SL with a minimum share capital of €1. However, this modality comes with additional obligations: as long as the capital is less than €3,000, the company must allocate at least 20% of the annual profit to the legal reserve until that figure is reached, and the partners are jointly and severally liable for up to €3,000 of the difference if the company is liquidated with debts. In practice, there is still an implicit liability for the €3,000.

That is why many advisors – and also us when they ask us – continue to recommend starting with €3,000 paid if the project allows it. It simplifies accounting management, avoids the small print of reinforced reserves, and projects a better image to banks and corporate clients. The "€1" option makes sense when real capital is scarce and it is preferred to be used for operational investment from day one. Setting up an SL with €1 is not a fad, it is a strategic choice that must be assessed on a case-by-case basis.

Can I set up an SL as a non-resident foreign partner in Spain?

Yes, it is perfectly possible to set up an SL with foreign partners who are not resident in Spanish territory. Individual partners will need to obtain a NIE (Foreigner Identity Number) before signing the deed, either in person in Spain at a National Police station or through the Spanish consulate in their country of residence. Foreign legal entity partners need to provide documentation equivalent to the certificate of incorporation of their country, apostilled according to the Hague Convention and translated into Spanish by a sworn translator if the original language is not Spanish.

In these cases, the traditional route with a notary and lawyer is usually preferable to the CIRCE route, because it allows you to accommodate the documentary particularities, coordinate international powers of attorney and validate the representation with the rigor required by an international corporate partner. At Ibercenter we have accompanied numerous subsidiaries of European, North American and Latin American groups that land in Spain in Velázquez and Azca, and we can confirm that the process works perfectly when it is planned four to six weeks in advance of the target signing date.

Is it mandatory to hire a notary or can I do everything online without a public deed?

In Spain, setting up an SL requires a public deed before a notary. This deed is the unavoidable legal requirement: without it there is no society. What has changed with the CIRCE route is that the deed can be executed before an online notary, with a qualified electronic signature, without physical displacement. In this modality, the notary is still essential as a notary public who validates identities and attests to the act; the signature channel is simply telematic.

Therefore, "setting up an SL without a notary" is not legally possible in Spain today. It is "to constitute an SL without physically going to the notary's office", which is a different thing. Any commercial offer that assures the contrary should generate suspicion. The notary is a legal guarantee that protects the entrepreneur himself, the partners and future creditors, and his intervention has a modest cost in relation to the security he brings to the founding act of the company.

What is the difference between SL and SLU?

A Sole Proprietorship Limited Partnership (SLU) is simply a Limited Partnership with a single partner. It shares the same regime, tax obligations, minimum capital and notarial and registry treatment with the SL. The only relevant difference is that the official name must include the word "Unipersonal" or the acronym "SLU", and that the contracts between the sole shareholder and the company must be documented in writing and recorded in a specific book-register – a requirement designed to avoid simulations and protect creditors.

If at any time the SLU ceases to be a sole proprietorship (a second partner enters), it automatically becomes an ordinary SL; and vice versa, if an SL with several partners is left with only one, it becomes SLU and must be reflected in the Mercantile Registry. For the entrepreneur who starts alone, setting up a one-person SL is the natural way; for those who already know that they are going to incorporate partners shortly, it is often preferred to set up an SL directly with two symbolic partners from the beginning.

Can an SL change its registered office after it is incorporated?

Yes, changing the address of an already constituted SL is a common and perfectly planned operation. The procedure depends on whether the change is within the same municipality – which in many cases can be approved by the administrator himself if the statutes allow it, without the need for a public deed – or if it involves a change to another municipality or province, in which case the agreement of the general meeting, a public deed before a notary and registration in the corresponding Mercantile Registry is required.

At Ibercenter we frequently see clients who have just set up an SL and who started with the management of a partner and a few months later professionalize their headquarters in Gran Vía, Azca or Velázquez through a virtual office with a tax domicile, or already established SLs that take advantage of a move to consolidate headquarters in the center of Madrid by renting private offices. It is an affordable operation, but it should be done well: without notifying the Treasury, Social Security, banks and customers, the change is half-finished and generates lost notifications.

Do I need to hire a tax consultancy from day one for my new SL?

Strictly, it is not mandatory; once an SL has been set up, it can be self-managed for tax purposes if its directors have sufficient knowledge. In practice, it is highly recommended. The tax obligations of an SL in its first year (form 036 correctly completed, 303 quarterly, 111 and 115 if there are withholdings, 202, 190, 200, annual accounts, accounting books) are numerous and each omission opens a proportional penalty. A tax advisor with experience in SMEs costs between €80 and €200/month depending on the volume and complexity; The cost of not having it can be around several times higher in avoidable sanctions.

Our recommendation when someone asks us how to set up an SL is to hire advice before the incorporation itself, so that they participate in the design of form 036, the administrator's framework in Social Security and the fiscal calendar. This early participation tends to generate more successful decisions (choice of VAT regime, VIES registration if there are European operations, correct framing in corporate self-employment) than if the advisor enters the scene when the incorporation is already signed and needs to be corrected as it goes.