TGSS and INSS in Spain: what is the difference?

The Tesorería General de la Seguridad Social has three core tasks: registration, collection and control.

Registration is the first and perhaps most important task. Every person who works in Spain or contributes to the social security system must be enrolled with the TGSS. This applies to employees, but also to the self-employed, domestic workers, students with a certain status and others. Upon registration you receive a NUSS, the Número de la Seguridad Social. That number is your unique identifier within the entire system and you need it for virtually everything related to work or benefits in Spain.

Employers are also required to register with the TGSS before taking on any staff. They receive a cuenta de cotización, a contribution account, and are responsible for making monthly social security payments on behalf of their employees. The TGSS checks that those payments are correct and that everything arrives on time.

The self-employed, known in Spain as autónomos, register with the TGSS through the RETA system, the Régimen Especial de Trabajadores Autónomos. This is the special scheme for the self-employed and it obliges them to pay a monthly contribution, the cuota de autónomo. The amount depends on the income you expect or declare. The TGSS manages those registrations and processes the monthly payments.

In addition to registration and collection, the TGSS also has a supervisory role. It checks whether contributions are being calculated correctly, whether registrations are accurate and whether there is any fraud. When a company has failed to properly register its employees or has evaded contributions, it is the TGSS that steps in.

The digital portal of the TGSS is called IMPORTASS. Through IMPORTASS you can view your contributions as a self-employed person or employee, update your details, download a payment receipt or deregister. IMPORTASS is also the portal you use when registering as an autónomo after having previously registered with the Tax Authority via Modelo 036.

The Instituto Nacional de la Seguridad Social has a very different focus. Whereas the TGSS ensures that contributions come in and everyone is correctly registered, the INSS ensures that people receive the benefits they are entitled to.

The INSS manages and provides a wide range of provisions. Pensions are the most well known. If you have worked in Spain and reach retirement age, it is the INSS that determines whether you are entitled to a pension, how high that pension will be and when it begins. That calculation is based on your contribution history, which is managed by the TGSS. The TGSS holds the data, the INSS makes the decision.

In addition to pensions, the INSS also deals with disability. When someone is temporarily or permanently unable to work due to illness or an accident, it is the INSS that determines whether there is an entitlement to a benefit and how high it is. Temporary incapacity is called incapacidad temporal in Spain, permanent incapacity is called incapacidad permanente. Both procedures go through the INSS.

The INSS also manages maternity and paternity benefits, survivor benefits, orphan benefits and other social provisions. In short, all situations in which someone is entitled to financial support from the social security system are assessed and managed by the INSS.

An important point is that the INSS can only pay out if the person concerned has built up sufficient contribution time. That information comes from the TGSS. The two institutions therefore work closely together, but they are organisationally completely separate. That also means they each have their own desk, their own staff and their own procedures.

The TGSS is relevant for everyone who contributes to the social security system in Spain, in whatever capacity. In practice that comes down to three groups.

The first group are employees in paid employment. They are registered with the TGSS by their employer and receive a NUSS. They do not pay contributions directly themselves, that is done by the employer on their behalf. However, it is useful as an employee to check your own registration through IMPORTASS and see what has been recorded about you.

The second group are the self-employed. For autónomos the TGSS is particularly relevant, because they have to register themselves with the RETA system, choose the level of their contribution based on their expected income and pay that cuota monthly. When they stop being self-employed, they also have to deregister with the TGSS. A mistake or delay there literally costs money.

The third group are employers. Every company or individual who takes on staff must be registered with the TGSS and pay contributions correctly. That also applies to domestic employees, a category that has its own rules in Spain but still runs through the TGSS.

There are also special situations in which the TGSS plays a role. Think of people who voluntarily contribute to the social security system via a Convenio Especial while not doing paid work, for example because they have temporarily stopped as self-employed but want to continue building their contribution history. That too goes through the TGSS.

The INSS is relevant for everyone who makes a claim on provisions from the social security system. That is a broad group.

Retirees are the largest group. If you retire in Spain, you arrange that through the INSS. That also applies to people who have lived or worked in another EU country and are entitled to a Spanish pension based on combined contribution periods under the European coordination regulations.

Those who become incapacitated and want to apply for a benefit turn to the INSS. This applies to both employees and the self-employed. The procedure is not straightforward and requires medical documentation, but it is the INSS that ultimately makes the decision.

New parents who want to make use of maternity or paternity leave in Spain notify the INSS. In Spain each parent is entitled to sixteen weeks of paid leave, and it is the INSS that pays that allowance, not the employer.

People living in Spain who can no longer work due to illness or injury can apply for a temporary incapacity benefit. That goes through the GP and the mutua, a kind of occupational insurer, but the final assessment and any long-term benefit go through the INSS.

For EU citizens and others who move to Spain and have already built up pension rights in another country, the INSS is also the first point of contact. Through the European social security coordination system, the INSS can combine contribution periods from different countries to determine whether someone is entitled to a pension.

The term Seguridad Social is an umbrella concept in Spain. It refers to the complete system of social protection, including all institutions, regulations and benefits. Both the TGSS and the INSS fall under the Seguridad Social, but they are separate organisations, each with their own management, legislation and portals.

A third organisation that also falls under the Seguridad Social and is regularly confused with the INSS is the IMSERSO, the Institute for Elderly People and Social Services. It deals with long-term care, home care for the elderly and people with disabilities. That is a completely different domain from the INSS.

There are also autonomous communities in Spain that manage their own social services. Catalonia, for example, has the ICAM for certain benefits, and other regions have their own institutions for supplementary social support. Those work alongside the national INSS, not instead of it.

To make it concrete, it is helpful to walk through a few common situations.

You move to Spain and start working as an employee. Your employer registers you with the TGSS. You receive a NUSS. You have little direct contact with the TGSS yourself, unless you want to check your contribution history or verify something. The INSS is not yet relevant at this stage, unless you become ill.

You move to Spain and start as self-employed. You register with the TGSS through IMPORTASS to enrol in the RETA system. The TGSS collects your monthly contribution. The INSS only becomes relevant when you become ill and want to claim a benefit, or later when you retire.

You become ill and are temporarily unable to work. Your GP issues a baja medica. That goes to the mutua of your employer or directly to the INSS, depending on your situation. The INSS assesses over time whether your incapacity continues and how high the benefit will be. The TGSS plays no active role here, but the INSS does use the contribution data from the TGSS to calculate your benefit.

You reach retirement age and want to retire. You submit an application to the INSS, not the TGSS. The INSS consults your contribution history at the TGSS and calculates your pension on that basis. If you have worked in multiple EU countries, you inform the INSS so they can request the foreign contribution periods through the European network.

Both institutions have their own digital portals, but they are not always equally user-friendly and access often requires a digital certificate or Cl@ve PIN.

The TGSS manages the IMPORTASS portal. Through IMPORTASS you can manage, adjust and pay your contributions as a self-employed person, and arrange your deregistration. You can also request your vida laboral there, an overview of your full contribution history in Spain. That document is important for pension calculations and visa applications, among other things.

The INSS has its own portal, accessible through the Tu Seguridad Social environment. There you can apply for a pension, follow the status of your application, view benefit overviews and receive correspondence.

For both portals you need a means of digital identification. That can be via a certificado digital, the Cl@ve system or in some cases via the app. Anyone who does not yet have a digital certificate would do well to arrange that as soon as possible, because more and more government services in Spain require digital access.