How do I become self-employed (autonomo) in Spain?

You usually register with the Spanish tax agency (AEAT) using Modelo 036 and with Social Security under RETA before starting activity. Most expats also set up a digital certificate, choose their economic activity code, and use a gestor for filings.

Is Modelo 037 still valid for autonomo registration?

No. AEAT removed Modelo 037 in 2025, so new censal registration is handled through Modelo 036.

Which tax forms do most autonomos file each quarter?

The common quarterly filings are Modelo 303 (VAT) and Modelo 130 (personal income tax prepayment), plus Modelo 349 for certain intra-EU B2B operations when applicable.

Do I always charge Spanish VAT on invoices?

No. VAT treatment depends on client location and service type. Spanish clients commonly require VAT, while many EU B2B and non-EU B2B services follow different place-of-supply rules. Verify your exact case with a qualified advisor.

When should I move from autonomo to a company (SL)?

Founders often consider switching when revenue is stable, liability exposure increases, or they start hiring. The SL route adds formal obligations but can improve risk separation, client perception, and long-term scalability.

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Self-Employment in Spain: Autonomo Playbook

A practical guide for freelancers, independent professionals, and solo operators: registration, invoicing, taxes, and compliance.

Who This Guide Is For

This guide is for people who plan to invoice clients directly in Spain: developers, designers, marketers, recruiters, consultants, language professionals, and hands-on service providers. If you are deciding between freelance work and payroll employment, compare this with our autonomo vs employee guide.

Core idea

The autonomo route is fast to start and flexible, but it turns you into the operations team: sales, delivery, contracts, invoicing, tax filings, and collections. The main win is control. The main risk is compliance and cash-flow pressure.

Setup Flow (Before First Invoice)

Sequence matters. In most cases, you should complete registration before issuing invoices or marketing services as active.

1) Identity and admin readiness

NIE/TIE and address evidence
Spanish bank account for taxes and social security debits
Digital certificate to file online with AEAT and Seguridad Social
Activity scope and invoice template prepared in advance

2) Tax registration (AEAT)

Register using Modelo 036. Define your activity code, VAT regime, and tax obligations. If you sell to EU businesses, you may need intra-community VAT setup and VIES enrollment.

3) Social Security registration (RETA)

Register with the self-employed regime (RETA). Reduced entry contributions may apply for new registrations depending on your profile and region. Confirm current conditions before filing.

4) Operational baseline

Decide who files returns (you or gestor), set a document storage workflow, and keep a dedicated account for tax reserves. A small operating system early prevents expensive fixes later.

Invoicing and Tax Obligations

Most autonomos run into trouble not because of tax rates, but because they apply the wrong invoice logic for the client type. Build one invoice checklist per market.

Client Profile	Typical VAT Handling	Extra Notes
Spain-based business/client	Usually Spanish VAT applies	IRPF withholding may apply to certain professional invoices
EU business (B2B)	Often reverse charge model	Usually requires correct VAT IDs and periodic intra-EU reporting
EU consumer (B2C, digital services)	Can fall under OSS rules	Service category and buyer status matter
Non-EU business (B2B)	Often outside Spanish VAT scope	Confirm place-of-supply and documentary evidence

Common filing calendar

Quarterly: VAT return (Modelo 303), income tax prepayment (Modelo 130 when applicable), and intra-EU operations (Modelo 349 where relevant)
Annual: income tax return (Modelo 100) and annual VAT summary obligations when required

Cash management rule

Set aside a fixed percentage from every payment into a separate tax reserve account. Do not treat gross invoice value as spendable income.

Compliance Risks to Avoid

Falso autonomo risk

If your setup behaves like disguised employment (single client, fixed schedule, managerial control), risk shifts to both parties. Keep contractual independence real: multiple clients where possible, scope-based delivery, and your own tools/processes.

Late or missing submissions

Penalties usually start small and escalate through repetition. Filing discipline matters more than optimization in year one.

Weak contract hygiene

Every project should include scope, acceptance criteria, payment terms, late-fee language, and IP/confidentiality clauses.

No liability protection

Professional indemnity or civil liability insurance can be essential for consultants and technical services.

When to Keep Autonomo vs Move to SL

Stay autonomo when operations are simple and risk is low. Consider an SL when revenue is predictable, contracts get larger, or hiring is in scope.

Autonomo is usually best when

You are solo with 1-3 service lines
You want low setup complexity
Your legal exposure is manageable
You are validating market demand

SL is often better when

You need stronger liability separation
You are hiring or partnering with co-founders
Clients request company contracting
You need a structure for scaling operations

If you are considering incorporation, continue with the starting a business in Spain guide.

First 90 Days Checklist

Month 1

Month 2

Standardize proposals and contracts, publish your positioning, and track profitability per project, not just total revenue.

Month 3

Run a compliance and margin review: billing cycle, tax reserves, client concentration, and collection performance.

Last updated: February 13, 2026. Tax and social security rules can change. Validate your case with AEAT, Seguridad Social, or a qualified gestor before filing.

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