How to Register as Autónomo in Spain: Complete Step-by-Step Guide (2026)

Cl@ve is Spain’s digital identity system for accessing public services online. It is faster to set up but less versatile than the FNMT certificate for certain tax procedures.

You can register for Cl@ve at clave.gob.es online (using a video identification service) or in person at a registration office.

Our recommendation: Get both. The FNMT certificate is more widely accepted and required for some specific procedures (such as certain Modelo filings). Cl@ve is useful as a backup and for simpler consultations via Importass.

This is your tax registration. You are declaring to the Spanish Tax Agency that you are beginning a professional or business activity.

Modelo 036 (full version) or Modelo 037 (simplified version). Most individual autónomos can use the simplified Modelo 037. You will need the full Modelo 036 if you:

• Operate in the intra-EU VAT system (VIES/ROI)
• Have special tax regimes
• Are registering a comunidad de bienes or similar entity

• Your personal details and NIE/NIF
• The date you are starting your activity (fecha de inicio de actividad)
• Your IAE activity code (Impuesto sobre Actividades Económicas) — this is the classification code for your professional activity. For example: 763 for IT consulting, 844 for advertising services, 861 for architects, 899.9 for “other professional services.” You can search the full IAE list on the Agencia Tributaria website.
• Whether you will charge IVA (VAT) — most services are subject to 21% IVA, but some are exempt (e.g., medical, educational, insurance)
• Your IRPF withholding obligation (retención) — whether your invoices to Spanish business clients will include IRPF withholding (typically 15%, reduced to 7% during the first 3 calendar years of activity)
• Your chosen accounting method — direct estimation (estimación directa simplificada) is the most common for freelancers

• Online: Via the Agencia Tributaria’s Sede Electrónica using your digital certificate or Cl@ve. This is instant.
• In person: At any Agencia Tributaria office, with prior appointment booked through sede.agenciatributaria.gob.es.

Practical tip: The date you declare as your start of activity in the Modelo 036/037 is critical — it determines when your tax and Social Security obligations begin. Make sure it aligns with your RETA registration date (Step 2). If they don’t match, you may face problems with both agencies.

After registering with the Tax Agency, you must enrol in the RETA — Spain’s special Social Security regime for self-employed workers. This enrolment is what entitles you to public healthcare, a future pension, sick leave, and maternity/paternity benefits.

• Form TA.0521 — the official RETA enrolment form
• Your NIE/NIF
• Your Agencia Tributaria registration confirmation (the filed Modelo 036/037)
• Your residence permit (if non-EU) showing authorisation for self-employment
• Your bank account details — for the automatic monthly direct debit of your Social Security contributions

• Online: Through the Importass portal using your digital certificate or Cl@ve. This is the fastest method and provides instant confirmation.
• In person: At any Oficina de la Tesorería General de la Seguridad Social (TGSS), with prior appointment.

Since 2023, Spain’s autónomo contribution system is based on real net income (rendimientos netos). When registering, you must forecast your expected monthly net income and select a contribution base within the bracket that corresponds to your income level.

You can change your contribution base up to 6 times per year, with changes taking effect on the 1st of every two months (March, May, July, September, November, January). Seguridad Social provides an official simulator to help you calculate your quota.

Key detail: Your contribution base determines not just your monthly payment, but also the amount of your future pension, sick leave benefits, and maternity/paternity payments. Choosing the minimum base saves money now but reduces your future benefits.

If you are registering as autónomo for the first time — or have not been registered in the previous 2 years — you are eligible for Spain’s tarifa plana (flat-rate discount).

2026 tarifa plana:

You request the tarifa plana during your RETA registration (Step 2) — it is not applied retroactively. Make sure your gestor or you tick the correct box when filing the TA.0521.

Common mistake: Many guides still cite “€80/month” as the flat cost. The real amount in 2026 is approximately €88,64/month because of the MEI (Mecanismo de Equidad Intergeneracional) surcharge of 0,9%, which is added on top of the base €80. It is a small difference, but it matters for accurate financial planning.

Once you are registered with both institutions, you must activate electronic notifications (notificaciones electrónicas) for both:

• Agencia Tributaria: Through the Sede Electrónica → Notificaciones electrónicas. This is mandatory for autónomos. All tax communications, requirements, and notifications will be delivered exclusively through this channel.
• Seguridad Social: Through the Importass portal → Buzón de notificaciones.

Warning: If you do not regularly check your electronic notifications inbox, you may miss tax requirements, penalties, or changes to your contribution status. Set a calendar reminder to check both inboxes at least once per week, or delegate this to your gestor.

As a registered autónomo, every service you provide must be documented with a compliant invoice. Spanish invoices must include:

• Your full name and NIF/NIE
• The client’s name and NIF (or VAT number if intra-EU)
• A sequential invoice number
• The date of the invoice
• A description of the service provided
• The taxable base (base imponible)
• The IVA rate applied (typically 21%) and the IVA amount
• The IRPF withholding rate and amount (if invoicing to Spanish business clients — 15%, or 7% during the first 3 calendar years)
• The total amount payable

Spain is progressively implementing Verifactu — a certified electronic invoicing system under Royal Decree 1007/2023 (as amended by RD 254/2025). This requires invoicing software to generate a digital fingerprint for every invoice issued, which is reported to the Agencia Tributaria.

What this means for you in 2026: While the full enforcement timeline is still rolling out, it is strongly recommended to start using Verifactu-compliant software now. Popular options include Holded, Quipu, Billin, Contasol, and Sage. If you use an accountant or gestor, confirm that their systems are Verifactu-compliant.

Registration is just the beginning. As an autónomo in Spain, you have recurring tax and administrative obligations:

• Social Security contribution — Automatically debited from your bank account on the last business day of each month.
• Invoicing — Issue compliant invoices for all services rendered.
• Record-keeping — Maintain a chronological register of all income and expenses.

• One of the advantages of being autónomo is the ability to deduct legitimate business expenses, reducing your taxable income. Commonly deductible expenses include:

  • Social Security contributions (fully deductible)
  • Professional insurance (civil liability, professional indemnity)
  • Coworking space or office rent
  • Home office — a proportional percentage of rent/mortgage, utilities, and internet if you work from home (you must declare the percentage of your home used for work in your Modelo 036/037)
  • Professional tools and software (laptop, design software, project management tools, invoicing platforms)
  • Internet and mobile phone (proportional to professional use)
  • Professional development (courses, certifications, conferences related to your activity)
  • Travel and transport directly related to your professional activity
  • Accountant / gestor fees

  From our experience: The home office deduction is the one that generates the most questions from our clients. The Agencia Tributaria allows you to deduct a percentage of your housing costs proportional to the area dedicated to work, plus 30% of utility bills (electricity, water, internet) corresponding to that proportion. It is not a generous deduction, but it is legitimate and should be claimed.

• Registering as autónomo is free — both the tax registration (Modelo 036/037) and the Social Security enrolment (TA.0521) carry no fee. However, there are associated costs you should factor in before, during, and after the process:

  Item	Cost
  Tax registration with Agencia Tributaria (Modelo 036/037)	Free
  RETA enrolment with Social Security (TA.0521)	Free
  FNMT digital certificate	Free
  NIE (fee modelo 790-012)	€16.08
  EU Citizen Registration Certificate (EX-18)	€12.00 (EU citizens only)
  First monthly Social Security contribution (tarifa plana)	~€88.64
  Gestor / tax advisor (monthly, optional but recommended)	€80–200/month
  Invoicing software (Verifactu-compliant)	€0–30/month (free options available)
  Total cost to get started (without gestor)	~€105–117
  Total cost to get started (with gestor)	~€185–317

  If you are a non-EU citizen, add the self-employed visa costs (visa ~€80, authorisation €203.84, TIE €16.08, translations, apostilles, and lawyer fees). See the full cost breakdown in our self-employed visa guide →

  Bottom line: Registering as autónomo in Spain is cheap. The real cost is not the registration itself, but the monthly obligations that start from day one — primarily the Social Security contribution and, if you hire one, your gestor’s fees.  

• This is one of the most frequently searched questions — and the answer depends on your income level, your IVA type, and whether you apply IRPF withholding. Here are the real calculations for 2026.

Important note: These are approximate calculations. Your effective IRPF rate depends on your deductions, personal situation, and autonomous community. They do not include deductible expenses, which would reduce your taxable base and therefore the IRPF you owe. For a personalised calculation, contact our tax team.

From our experience: Many autónomos are surprised to discover they need to invoice 50% to 80% more than what they want to “take home.” This is precisely why you should include realistic figures in your business plan when applying for the self-employed visa — immigration officers will assess whether your projections are credible.

This situation is more common than you might think, especially during the first few months of activity or during slow periods. The short answer: you still pay your Social Security contribution, without exceptions.

• Social Security contribution: It is charged every month you remain registered, regardless of whether you have earned anything. Under the tarifa plana, this is ~€88.64/month; without it, €205 to €580+/month depending on your bracket.
• Obligation to file quarterly tax returns: You must submit Modelo 303 (IVA) and Modelo 130 (IRPF) even if they are “blank” (zero). Failure to file triggers automatic penalties.

• IRPF: If you have no net income, there is no taxable base and your quarterly advance payment will be €0.
• IVA: If you have not issued any invoices, your output IVA is €0. However, if you have deductible expenses with input IVA, you can accumulate it as a credit to offset in future quarters.

There is no official “temporary deregistration” in the RETA system. You have two options:

1. Deregister fully and re-register when you resume activity. If fewer than 2 years have passed since your last registration, you will lose your right to the tarifa plana on the new registration.
2. Stay registered and absorb the monthly contribution as a fixed cost while you reorganise your activity.

Practical advice: If you foresee a long period without income (more than 2–3 months), it is usually more cost-effective to deregister and save on contributions. But if you have only been registered for a few months and are benefiting from the tarifa plana, consider whether losing it is worth it. This is a calculation best done with your gestor or tax advisor.

For non-EU citizens, add the self-employed visa processing time (3–6 months) before this timeline begins. Read our complete self-employed visa guide →

For non-EU citizens, add the self-employed visa processing time (3–6 months) before this timeline begins. Read our complete self-employed visa guide →