How to register as self-employed (autónomo), step by step

Terms used

• DNI — The DNI is the national identity card of Spanish citizens.
• NIE — The NIE is the identification number Spain gives to foreigners.
• AEAT — The AEAT is Spain's tax agency.
• Modelo 036 — Modelo 036 is the full census form used to register your activity and tax choices with the tax agency.
• Alta — The alta is your registration with Social Security as a self-employed worker.
• Cl@ve — Cl@ve is the government's electronic identity system for filing procedures online.
• Gestor — A gestor is a professional who handles tax and administrative paperwork for you.
• Mutua — A mutua is a private body that provides work accident and cessation of activity cover for the self-employed.

Key rules

• Order: Register with the tax office first, then with Social Security.
• Alta window: You can ask for the Social Security alta up to 60 days before your activity starts, and no later than the start date.
• Late alta: A late alta takes effect only from your application date, and penalties can apply.
• Mutua: If you do not choose a mutua in the alta, Social Security assigns one.

The short version

You register twice. First you tell the tax office you are starting an activity. Then you register with Social Security. Each step has its own form, its own channel and its own timing. Both can be done online, or with help at an assisted point.

Start only once you hold your NIE and valid work authorisation. The process below shows the order, and the checklist and documents list cover the rest.

Step 1: the tax census with the AEAT

You file the census form modelo 036 with the AEAT. File it before your first operations or payments. Most people now use modelo 036. The shorter modelo 037 is limited to some individuals and has been phased out in practice.

File online at the AEAT electronic office with a digital certificate, Cl@ve or the electronic DNI. Paper filing is limited, and some offices ask for an appointment.

The census gives you your activity code (the IAE epigraph) and your activity start date. Social Security asks for this data next, so doing the census first avoids mismatches between the two offices.

Tax choices you make in the census

The census is where you declare your tax set-up. You choose:

• Income tax method. Direct estimation (simplified, if you qualify) is the default. Modules apply only to qualifying activities.
• VAT regime. The general regime is the default. Simplified VAT or the equivalence surcharge are only for qualifying activities.
• Regular filings. Quarterly VAT (modelo 303) and quarterly income tax instalments (modelo 130 or 131).
• Other items. Withholdings on people you pay (modelo 111) and trading with other EU countries (ROI), if they apply to you.

Most professionals use direct estimation with the general VAT regime. Whether you can use modules, and how often you file, depends on your turnover and activity. The choice box below helps you decide. This does not cover the Canary Islands or Ceuta and Melilla, which have different indirect taxes.

Step 2: the Social Security alta

You ask for the self-employed alta with form TA.0521/1. You can file it:

• online, through the Social Security electronic office or the Import@ss portal, with a digital certificate or Cl@ve;
• through a gestor acting as your registered representative;
• in person at a Social Security office, usually by appointment.

You will need your NIE or DNI, your activity code, the census data from the tax office and your bank details for direct debit of your contributions.

Timing

You can ask for the alta up to 60 days before your activity starts, and no later than the start date. Done in that window, the alta takes effect on your start date. If you apply after you have already started, it takes effect on the application date instead, and penalties or surcharges can apply.

Choose a mutua

In the alta you choose a collaborating mutua, or the INSS. It covers work accidents, occupational illness and cessation of activity benefit, which are mandatory for the self-employed. It also manages sick pay for ordinary illness. If you choose none, Social Security assigns one. Ask the mutua and Social Security about changing it later.

Getting help

You can do everything yourself online if you have a digital certificate or Cl@ve and are comfortable in Spanish. Otherwise use a gestor, or go in person to a tax office or Social Security office.

Entrepreneur assistance points (PAE) can handle some tax and Social Security registration in one procedure. They are mainly for setting up companies and sole traders, so ask whether yours can do both of your registrations.

Extra steps for some activities

If you work from premises, ask your town hall about a local licence or declaration. If your activity is regulated or needs a professional association, ask the tax office or Social Security what else you need.

Common questions, such as backdating and registering more than one activity, are answered in the quick answers below.

Choosing between options

Which tax method and VAT regime should you declare when you register?

• Direct estimation with the general VAT regime: This is the usual choice for professionals and the default if you are eligible, with quarterly VAT (modelo 303) and income tax instalments (modelo 130).

• Modules (objective estimation): Only if your activity qualifies for it. Income tax instalments are then filed under modelo 131.

• Simplified VAT or equivalence surcharge: Only for activities that qualify. Otherwise the general regime applies.

Start from the default (direct estimation, general VAT). Pick modules or a special VAT regime only if your activity is on the list that qualifies and your turnover is within the limits.

Registration order: tax office first, then Social Security

• Get your foreigner ID number (NIE) and valid work authorisation. You register with the tax office first, then Social Security, and only once you hold both.: before you start

• File the tax census form (modelo 036) with the tax agency, the AEAT. Do it online at the AEAT electronic office with a digital certificate, Cl@ve or the electronic DNI. It sets your activity code, VAT regime and income tax method.: before your activity starts or before your first operations or payments

• Ask for the self-employed alta with Social Security (form TA.0521/1). Use the Social Security electronic office or the Import@ss portal with a digital certificate or Cl@ve, or go in person by appointment.: after the tax census, within the alta window

• Ask your town hall about a local licence or declaration if you work from premises.: if you have premises, before you open

• Gather your documents. The tax office asks for your passport and NIE, your activity code and your address. Social Security asks for your ID or NIE, your tax registration data, your Spanish Social Security number and bank details for the monthly direct debit. The immigration office (Extranjería) issues the NIE and residence or work permit.: before each filing

• Know who handles what. The tax agency (Agencia Tributaria) handles the census. The Tesorería General de la Seguridad Social handles the alta. Immigration handles your NIE and permit.: at each step

• If you have a digital certificate or Cl@ve and are comfortable in Spanish, file both steps yourself, as no law requires an adviser. If not, hire a gestor (a licensed filing adviser), who needs your written authorisation to act for you.: at the decision point, before the first filing

• Check your tax residence in the year you move. You are tax resident for the whole calendar year if you spend more than 183 days in Spain or your main economic interests are here. Your residence permit date does not decide this. If you want the special Beckham regime, request it with modelo 149 within 6 months of your Social Security alta or of starting work in Spain. If you sell assets or receive dividends in the move year, check your country's tax treaty and exit rules.: in the year you move, before you file

• If the alta is rejected because you have no valid ID or work authorisation, get the authorisation first, then file again. If you chose the wrong activity code or tax regime, file a modification with modelo 036 within one month of the change, or as soon as you spot the error.: if a filing is refused or contains a mistake

• If you registered too early, you pay contributions from the alta date and the tax office may expect returns, even empty ones, before you earn anything. Cancel the alta (a baja) with Social Security, change or cancel the census with modelo 036, then register again at the right date.: if you registered before your real start

• If you started working before registering, register as soon as you can, file any missing tax returns and pay what you owe. The alta then takes effect from your application date, not earlier. Expect a fine of 20 to 400 euros for late census filing, surcharges of 1% to 20% on late returns plus interest, and unpaid contributions.: after missing the window

Documents you need

• Your NIE (foreigner ID number) or DNI, needed for both the tax census and the Social Security alta.

• A digital certificate, Cl@ve or electronic DNI, to file the tax census and the Social Security alta online.

• The tax census form, modelo 036 (the full form), filed with the tax agency. Most people now use it instead of the simplified modelo 037.

• The Social Security self-employed registration form, TA.0521/1, filed with Social Security (the TGSS).

• Your activity code (CNAE) and the census data from the tax agency, which Social Security asks for.

• Your bank details for direct debit of your monthly contributions.

Checklist

• File the tax census (modelo 036) before your first operations or payments, online at the tax agency's electronic office with a digital certificate, Cl@ve or electronic DNI.

• Declare your tax methods in the census: income tax method, VAT regime and quarterly filings.

• File the Social Security alta (form TA.0521/1) after the census, because Social Security asks for your activity data. Do it within days of the census.

• Choose how to file: fully online, through a gestor, or in person at a tax agency or Social Security office, usually by appointment.

• Ask the tax agency or Social Security about extra steps if your activity is regulated or needs a professional association.

Registration quick answers

Do I need a Spanish bank account to register as an autónomo?

A Spanish IBAN is the safe choice for your monthly Social Security direct debit. Foreign SEPA accounts are accepted in principle, but in practice many people open a Spanish account anyway because of the forms and tax payments.

When does my self-employed registration start counting?

Your Social Security registration takes effect on your activity start date if you file within the allowed window. The date on the application sets when your contributions start, so choose it carefully.

Can I backdate my registration to when I really started?

No, backdating is generally not allowed beyond very limited cases. If you file after starting, the alta takes effect from your application date. Fines and surcharges may apply, and the tax census date cannot be freely moved back either.

Can I register more than one activity?

Yes, you declare several activities in the same census form, each with its own activity code. You still make only one Social Security registration, with a main activity. You can add activities later with a modification (modelo 036), and different VAT regimes can apply to each.

Can I register as self-employed without a gestor?

Yes, you can file both the tax census and the Social Security alta yourself, online with a certificate or Cl@ve, or in person. A gestor is mainly useful if you lack digital ID or Spanish, or want help with quarterly returns and bookkeeping.