A Sociedad Anónima in Spain is the country’s public limited company form, built for capital-intensive ventures and designed to let businesses raise money by issuing transferable shares while capping each shareholder’s exposure at what they invested. It requires at least €60,000 in share capital, exists as its own legal person, and can be formed by a single shareholder or many. Rooted in Spain’s civil law tradition and governed by the Capital Companies Act (Ley de Sociedades de Capital), the S.A. is the vehicle Spanish companies typically choose when they plan to tap public markets or bring in a wide investor base.
Capital and Shareholder Requirements
The minimum share capital is €60,000. Every share must be assigned to an owner before the company can register, so the full amount is “subscribed” from day one. Founders don’t have to pay all of it upfront, though. At least 25% of each share’s face value must sit in a company bank account at incorporation, with the rest paid on the schedule the bylaws set.1Ministry of Justice. Spain Code – Royal Legislative Decree 1/2010
Missing an installment has consequences. A shareholder who falls behind loses the right to vote and the right to collect dividends until the balance is paid.
One shareholder is enough. Single-shareholder S.A. companies must register that status with the Mercantile Registry and note it on all corporate documentation.
How the Company Is Governed
An S.A. is a legal person separate from its owners. It signs contracts, owns property, sues, and gets sued in its own name. If it fails, shareholders lose their investment and nothing more; personal assets stay out of reach.
Shares are freely transferable unless the bylaws restrict them. An investor can sell without forcing the company to dissolve, and buyers can come in the same way. Ownership and management stay separate by design: shareholders vote on major decisions at general meetings, while day-to-day operations sit with an administrator or board of directors. The company can operate under a sole administrator, joint administrators, or a board, and any board must have at least three members.
How to Form a Sociedad Anónima
Name Certificate and Capital Deposit
The process starts at the Central Mercantile Registry, where founders apply for a Certificate of Uniqueness confirming the proposed name is available.2Central Mercantile Registry. General Information The name must carry either “Sociedad Anónima” or the abbreviation “S.A.” to signal the legal form. Once the name is secured, founders open a bank account in the company’s name and deposit the initial capital. The bank issues a certificate confirming the funds, and that certificate becomes part of the incorporation file.
Articles of Association
The Articles of Association are the company’s internal rulebook. They define the corporate purpose, the registered office, and how the company will be run. Founders pick an administrative model, spell out how shareholder meetings function, describe profit distribution, and set the face value of each share along with any voting rights attached. Vague or incomplete articles are one of the most common reasons notaries send founders back to redraft, so precision here saves time later.
NIE for Foreign Founders
A non-Spanish individual who wants to hold shares or serve as a director must first get a Foreigner Identity Number (NIE) from Spain’s General Police Directorate or, from abroad, through a Spanish consulate.3Plataforma ONE. Application for NIE for International Investors The application takes Form EX-15 in duplicate, a valid passport or EU identity document, and proof of paying the €9.84 processing fee (Form 790, Code 012). The applicant explains their economic or professional reason for the number, and once the file reaches the competent office, authorities have five business days to process it. Without a NIE, a foreign founder can’t appear in the public deed, so this needs to be done well before the notary appointment.
Public Deed and Mercantile Registry
With the name certificate, bank deposit receipt, Articles of Association, and any NIE documents in hand, all founding shareholders appear before a public notary to sign the Public Deed of Incorporation. The notary checks that everything complies with the Capital Companies Act and converts the founders’ private agreements into an official public instrument. Notary fees scale with share capital and structural complexity, typically running from €300 to €1,000.
The signed deed then goes to the local Mercantile Registry, where the registrar reviews it and enters the company in the public ledger. The company acquires full legal personality the moment that entry is recorded.
Tax Identification Number
The company needs a Tax Identification Number (NIF) to operate. It gets a provisional NIF before registration, then has one month after the Mercantile Registry entry to request the definitive NIF.4Agencia Tributaria. Legal NIF
Annual Compliance and Reserves
Legal Reserve Before Dividends
Before any dividends go out, the company must set aside 10% of annual profit into a legal reserve. The obligation runs every year until the reserve reaches at least 20% of share capital.1Ministry of Justice. Spain Code – Royal Legislative Decree 1/2010 The reserve can’t be used to pay dividends and can only offset losses when no other available reserves remain.5BOE.es. Real Decreto Legislativo 1/2010 – Ley de Sociedades de Capital A profitable first year does not automatically mean cash to investors; the reserve comes first.
Shareholders’ Meeting and Accounts
Every S.A. must hold an ordinary general shareholders’ meeting within the first six months of each fiscal year. Shareholders review management, approve the prior year’s financial statements, and decide how to allocate profits or losses. Directors prepare the annual accounts within three months of the fiscal year’s close, giving shareholders time to review before the meeting.
Once approved, the accounts must be filed with the Mercantile Registry within one month. On a standard January-to-December fiscal year, that means accounts drafted by March 31, approved by June 30 at the latest, and filed by July 30. Missing these deadlines can block the company from registering other documents at the registry and trigger administrative penalties.
When an Audit Is Required
Not every S.A. needs an external audit. A statutory audit is mandatory when the company exceeds two of these three thresholds for two consecutive fiscal years: a balance sheet above €2,850,000, net turnover above €5,700,000, or an average of more than 50 employees. Companies below those limits still file annual accounts, but skip the audit. Larger S.A. entities and those planning to list on a stock exchange face additional audit and transparency requirements.
U.S. Tax Exposure for American Shareholders
If you’re a U.S. citizen or resident investing in a Sociedad Anónima, the IRS treats your stake as a foreign corporation interest, and the reporting burden falls on you. Spain does not report your ownership to U.S. authorities.
A U.S. person who owns 10% or more of the voting power or value of an S.A. is generally required to file Form 5471 with their federal tax return. A “controlled foreign corporation” (CFC) exists when U.S. shareholders collectively own more than 50% of the voting power or total value, and each 10%-or-greater U.S. shareholder of a CFC must file annually.6Internal Revenue Service. Instructions for Form 5471 The penalty for failing to file a complete and correct Form 5471 is $10,000 per form. If the IRS sends a notice and you still don’t file within 90 days, an additional $10,000 accrues for every 30-day period of continued non-compliance, capped at $50,000 in continuation penalties.7Internal Revenue Service. International Information Reporting Penalties
U.S. shareholders of a CFC also have to account for Global Intangible Low-Taxed Income (GILTI), which taxes the CFC’s active earnings above a 10% deemed return on tangible business assets. Starting in 2026, the effective U.S. tax rate on GILTI income is scheduled to rise to roughly 16.4%, up from 13.125%, because the Section 250 deduction drops from 50% to 37.5%. A real operating business with significant Spanish assets may feel little of it; an asset-light, highly profitable S.A. will feel more.
There’s also PFIC risk. A foreign corporation meets the Passive Foreign Investment Company definition if 75% or more of its gross income is passive, or at least 50% of its assets produce or are held to produce passive income.8Office of the Law Revision Counsel. 26 U.S. Code 1297 – Passive Foreign Investment Company PFIC status triggers punitive tax treatment on distributions and gains, plus an interest charge that compounds over the holding period. U.S. shareholders of a PFIC must file Form 8621 for each tax year in which they receive distributions, dispose of shares, or are otherwise required to report under Section 1298(f).9Internal Revenue Service. Instructions for Form 8621 Holding companies, real estate vehicles, and dormant S.A. entities are particularly vulnerable to inadvertent PFIC classification.
One boundary worth noting on the U.S. side: as of March 2025, FinCEN’s beneficial ownership information (BOI) reporting requirement under the Corporate Transparency Act applies only to entities formed under foreign law that have registered to do business in a U.S. state or tribal jurisdiction.10FinCEN.gov. Beneficial Ownership Information Reporting An S.A. operating only in Spain has no BOI obligation. If your S.A. does register with a U.S. secretary of state, you must file a BOI report with FinCEN within 30 calendar days of receiving notice that the registration is effective, and foreign reporting companies are not required to list U.S. persons as beneficial owners.