Autónomo and Seguridad Social: What You Pay and How to Register

What RETA is and why it matters

RETA is the specific branch of the Seguridad Social for self employed workers. Employees are registered under the Régimen General by their employer. Autónomos register themselves under RETA and pay their own contributions directly. The RETA registration gives you a NUSS (your social security number, if you do not already have one), activates your entitlement to public healthcare (Tarjeta Sanitaria), starts your pension contribution clock, and gives you access to sick leave benefits (incapacidad temporal) and cessation of activity benefits (the autónomo equivalent of unemployment benefits, introduced in 2019).

What RETA does not give you is unemployment benefits in the traditional sense. The "cese de actividad" benefit exists but is more limited than the employee unemployment benefit (prestación por desempleo). It requires you to prove that your activity has ceased involuntarily, which has a higher documentation burden than simply being laid off as an employee.

How much you pay: the cuota structure since 2023

Since January 2023, the autónomo cuota is based on your actual net income (rendimientos netos), not on a base you choose yourself. This was a major reform. Under the old system, most autónomos chose the minimum base regardless of their income, paying the lowest possible cuota. Under the new system, the TGSS assigns you to a bracket based on your declared income, and the cuota adjusts accordingly. You can still benefit from the Tarifa Plana if you are a new autónomo.

The key thing to understand is that you declare your expected annual income when you register, and the TGSS calculates your cuota based on that declaration. If your income changes during the year, you can adjust your declared base up to six times per year through Import@ss. At the end of the year, the TGSS compares your actual income (from your tax return) with what you declared and either refunds the difference or charges you the shortfall. This regularisation process means you cannot simply declare the minimum and hope for the best. If your actual income is significantly higher than what you declared, you will receive a bill.

The Tarifa Plana: the new autónomo discount

If you are registering as autónomo for the first time (or re registering after at least three years of inactivity), you qualify for the Tarifa Plana. This is a flat rate cuota of approximately 80 euro per month for the first 12 months. If your net income during those 12 months stays below the minimum interprofessional salary (SMI, currently around 1,134 euro per month), the Tarifa Plana extends for another 12 months. After the Tarifa Plana period ends, you move to the income based bracket system described above.

The Tarifa Plana is one of the most attractive features of starting as autónomo in Spain. At 80 euro per month, it gives you full Seguridad Social coverage (healthcare, pension contributions, sick leave) at a fraction of the normal cost. When Tjitske registered as autónomo, the Tarifa Plana meant her total monthly overhead (cuota plus Xolo bookkeeping fees) was around 280 euro. That is manageable even when you are still building your client base.

What your contributions cover

Your monthly cuota as autónomo covers several branches of social protection. Contingencias comunes (the largest portion) covers public healthcare access through the Seguridad Social, pension contributions that count toward your retirement, and temporary incapacity (sick leave) benefits. Contingencias profesionales covers accidents and occupational diseases. Cese de actividad covers cessation of activity (the autónomo version of unemployment). Formación profesional funds vocational training programs.

What your cuota does not cover: dental care (beyond basic extractions in some regions), optical care, and it does not provide the same level of unemployment protection as employee contributions. If you stop working as autónomo, the cese de actividad benefit is more limited and harder to access than the employee equivalent.

How to register: the two step process

Registering with the Seguridad Social as autónomo is the second of two registrations. The first is the alta censal at the Agencia Tributaria (Hacienda) through Modelo 036, where you register your economic activity, choose your IAE code, and select your IVA and IRPF regimes. The TGSS registration must happen within 60 days of the Hacienda registration, but in practice most people do both on the same day or within a few days.

Online via Import@ss. If you have a Certificado Digital, you can register through the TGSS portal Import@ss (importss.seg social.es). The system walks you through the process: you enter your NIE, select the RETA regime, declare your expected income, choose your coverage options (contingencias profesionales and cese de actividad are mandatory since 2019), and submit. The system assigns your NUSS if you do not have one and activates your coverage from the date you specify (which must match or follow your Hacienda alta date).

In person. You can also register at a TGSS office with a cita previa. Bring your NIE or TIE, your empadronamiento, a copy of your Modelo 036 alta (the receipt from Hacienda confirming your registration), and your bank account details (IBAN) for the direct debit of your monthly cuota. The officer processes the registration and gives you your NUSS on the spot.

After registration: your Tarjeta Sanitaria

Once your TGSS registration is active, go to your local Centro de Salud with your NUSS, your NIE or TIE, and your empadronamiento to register for your Tarjeta Sanitaria. This health card links you to a GP (Médico de Cabecera) and gives you full access to public healthcare. The Centro de Salud assigns you a doctor based on your registered address. In some regions you receive a temporary card immediately; in others the permanent card arrives by post within a few weeks.

What happens when your income changes

The income based cuota system means your contributions should track your actual earnings. If your income increases, your cuota increases. If your income drops, you can lower your declared base and pay less. You adjust your declaration through Import@ss up to six times per year, with changes taking effect in the following two month period.

At the end of the year, the TGSS performs a regularisation. They compare your declared income with your actual income as reported on your tax return (Modelo 100). If you paid too much, you get a refund. If you paid too little, you receive a complementary charge. This regularisation typically happens in the autumn following the tax year. It is not a penalty; it is a reconciliation. But it can be a surprise if you declared low and earned high. Set money aside for the potential shortfall.

Common mistakes when registering

The most common mistake is registering with the TGSS before completing the Hacienda alta. The TGSS requires a reference to your Modelo 036 registration. If Hacienda has not processed your alta yet, the TGSS registration will fail or be delayed. Always complete Hacienda first, get the confirmation, then register at the TGSS.

The second mistake is not specifying the correct start date. Your TGSS alta date should match your Hacienda alta date. If they do not align, you may have days where you are registered for tax purposes but not covered by social security, or vice versa. This creates administrative problems and can affect your Tarifa Plana eligibility.

The third mistake is underestimating the end of year regularisation. Declaring the minimum income to pay the lowest cuota feels smart in January, but the bill arrives in October when the TGSS compares your declaration with your actual tax return. Declare honestly and adjust quarterly as your income picture becomes clearer.