How to start a business in Spain in 2026: the real process, step by step

How to Start a Business in Spain in 2026: The Real Process, Step by Step

There are two types of guides about starting a company in Spain. The first ones explain what a limited liability company is by citing article 1 of the Capital Companies Law. The second ones tell you "register as a self-employed worker, it's very easy" and stop there. This is neither of the two.

Here is the real process: the four administrative steps, the real timelines, the costs in euros with the rates in effect in 2026, and the points where people get stuck. If you read it all the way through—ten minutes—you'll know exactly what to do tomorrow morning.

The first thing you should decide (before any procedure)

The most important question is not how to create the company. It's what legal form to adopt. That decision determines everything else.

Three reasonable options to start in 2026:

• Self-employed (Individual Entrepreneur): immediate registration, unlimited liability with your personal assets, taxation by personal income tax, fixed Social Security contribution. Ideal if you invoice less than €60,000 per year and your activity doesn't involve serious property risks.
• Limited Liability Company (SL): asset separation, minimum capital €3,000, taxation by Corporate Income Tax (25%, or 23% for microenterprises with profit < €1M). Recommended if you expect to invoice more than €60,000, you have partners, or you're going to hire employees.
• Individual Limited Liability Company (SLU): the SL for a single partner, same costs and obligations as an SL, but administratively simpler.

There's no universal answer. The decision depends on three variables: risk level of your activity, expected billing volume over 24 months, and whether you'll have partners. If you're unsure, tools like BoostPro AI's Legal Status analysis cross these variables with your sector and tax region to give you a reasoned recommendation, with comparative simulation of three regimes.

Once decided, the real process begins.

Step 1 — Tax Authority: Business Registry Registration (24 hours)

The first official procedure is to register in the Census of Entrepreneurs, Professionals and Withholding Agents of the Tax Agency. This is done by filing form 036 or 037, depending on your profile.

Form 037 (simplified, for simple self-employed)

• Natural person
• Without permanent establishment
• Not a member of a VAT group
• Activity not exempt from VAT by special regime

For the majority of individual self-employed workers (services, consulting, trades), form 037 is sufficient and can be completed in 15 minutes on the AEAT Electronic Office.

Form 036 (general)

Mandatory for:

• Companies (SL, SLU, SA, cooperatives)
• Activities with branches in multiple provinces
• Intra-community operations
• Special VAT regime (equivalence surcharge, agriculture, etc.)

What you need to decide before filing it

Three fields in the form change your tax life for years:

1. VAT regime: general (quarterly declaration, form 303) or exempt by activity (doctors, teachers, certain social services). Check if your CNAE is exempt before checking the box.
2. Personal Income Tax regime: simplified direct estimation (light accounting books, deduction of real expenses) or modules / objective estimation (predetermined fixed fee, no need to keep accounting). The choice is made once a year in December for the following fiscal year.
3. IAE Code: the economic activity code determines your taxation and, if your billing exceeds €1,000,000, also a municipal tax. Choose carefully—an incorrect code can cost thousands of euros in adjustments.

Real timeline: the electronic form with digital certificate or Cl@ve PIN is processed in less than 24 hours. The registration is effective on the date indicated in the form (can be up to 30 days after filing).

Cost: €0.

Step 2 — Social Security: RETA Registration (same day)

The second procedure, which should be done the same day or at most within 60 calendar days following the start of activity, is registration in the Special Regime for Self-Employed Workers (RETA).

Monthly contribution in 2026

Since the 2023 reform, the contribution is calculated based on expected net income (revenues minus deductible expenses, not gross billing).

Brackets in effect 2026 (data from the Ministry of Inclusion, Social Security and Migration):

Actual income is regularized the following year with your personal income tax return. If you've estimated one bracket and end up earning more or less, Social Security automatically adjusts the difference.

Flat Rate for New Self-Employed

If it's your first time registering as self-employed—or you haven't contributed in the previous 2 years—you pay €87/month for the first 12 months regardless of your base. This represents savings of up to €1,800 in the first year compared to the minimum contribution.

Additional reductions in the second year (50% bonus for 6 months, 30% for another 6 months) apply to specific groups: under 30, women under 35, people with disability ≥33%, victims of gender violence, family collaborator self-employed.

Procedure: electronic at Importass with Cl@ve, DNIe or digital certificate. Real time: 10 minutes. Confirmation: immediate.

Step 3 — Municipality and Licenses (if applicable)

This is where many businesses get stuck. Not all activities need a municipal license, but some do.

Activities without a license (most liberal professionals)

Consultants, digital freelancers, translators, programmers, non-medical therapists, trainers: in general, they don't need an opening license. The registration with the Tax Authority and RETA is sufficient. Some municipalities require a declaration of responsibility (simple form, free or with symbolic fee of €30–60).

Activities requiring a license (commercial premises, hospitality, healthcare, etc.)

If you're opening a physical location: you need an activity license and, depending on the nature of the business:

• Minor or major work license (if you modify the premises)
• Environmental license (classified activities: hospitality, workshops, etc.)
• Health authorization (food, hairdressing, aesthetics, healthcare)

Cost and timeline: highly variable by municipality. Madrid: between €100 and €1,500 in fees, 3–8 weeks. Barcelona: €200–2,000, 4–10 weeks. Small towns: often less than €100, 1–3 weeks. Important: in many municipalities you can start the activity with a declaration of responsibility while the license is being processed (verify this in your municipality before paying rent).

Step 4 — Professional Bank Account and Invoicing

The last operational step is to separate your personal and professional finances—mandatory for companies, strongly recommended for self-employed.

Bank account

• Self-employed: a personal account may work legally, but banks require an economic activity account for many operations (POS, credit, leasing). Average fee 2026: €0 the first 12 months on pro accounts from N26, BBVA, ING, Sabadell; then €15–30/month.
• Company: bank account mandatory, opened before the notarial deed for the deposit of the capital (€3,000 minimum in SL).

Invoicing system

Since the Anti-Fraud Law (Law 11/2021) and the Verifactu Regulation which came into effect from July 2025, all invoicing software must comply with technical requirements for unalterability and traceability. In 2026, using Excel to invoice is legally risky.

Legal options:

• Verifactu-certified software (Holded, Quipu, Anfix, FacturaScripts, etc.): from €9/month
• Free public platform from the Tax Agency (under development, partial availability in 2026)
• Proprietary software that complies with regulations (with developer's declaration of responsibility)

The real total cost of starting in Spain in 2026

Summary for an individual self-employed without physical premises, first year:

For an SL without physical premises, first year:

The subsidies that reduce this cost

Before paying anything, it's worth checking the subsidies your project may be eligible for. Beyond the Flat Rate, in 2026 the main programs are:

• ICO Business and Entrepreneurs Line: loan of up to €12.5M, preferential conditions, up to 20 years amortization
• ENISA Young Entrepreneurs: participatory loan up to €75,000 without personal guarantees for under 40s with innovative project
• ENISA Entrepreneurs: up to €300,000 for projects with some maturity
• CDTI Neotec: up to €250,000 non-refundable for tech startups
• Acelera Pyme (Red.es): vouchers for digitization (Digital Kit, Consulting Kit)
• Regional subsidies: each autonomous community has its own programs (Gencat, Madrid Emprende, IGAPE Galicia, etc.)

The BoostPro AI aid simulator crosses your profile (legal form, sector, autonomous community, number of partners, expected billing) with the 33 registered subsidies for Spain and returns only the compatible ones, with the estimated amount and link to the managing body. If the sum of eligible subsidies exceeds €1,500, the simulator is tax-deductible; if not, it's entirely refundable.

Common mistakes that delay registration

Three typical bottlenecks seen in 2026:

1. Choosing a generic IAE code ("other consulting services, not otherwise specified") when a better specific code exists. Result: higher personal income tax billing when the quarterly form arrives.
2. Forgetting registration in the Industrial or Health Register when the activity requires it. Administrative closure possible, fines up to €60,001.
3. Confusing Flat Rate with general bonus. The Flat Rate only applies if you've never been self-employed before (or haven't been for 2 years). Requesting it when this requirement isn't met can generate regularization with interest.

In summary

Starting a business in Spain in 2026 is—administratively—faster and cheaper than many think. Three days are enough for a self-employed person with everything in order. Two weeks for a well-prepared SL. What takes time is not the administration, but the preliminary decisions: legal form, tax treatment, business model.

To precisely shorten these decisions, BoostPro AI generates a complete business plan (with 3-year financial projection, competitive analysis and tax simulation) in 15 minutes based on a guided questionnaire. Particularly useful for taking to the meeting with the bank, notary or ENISA, where professional documentation greatly accelerates the process.