Convenio de Seguridad Social Mexico España: What It Means for Your Pension and Healthcare

Most Mexicans moving to Spain focus on the visa process and forget about social security entirely until they are already in Spain and someone hands them a bill for RETA contributions (Spain's self-employed social security regime, which runs approximately €300–€500 per month). The Mexico-Spain Bilateral Social Security Agreement exists precisely to prevent this double payment — but using it correctly requires a specific document obtained in Mexico before you leave.

What the Agreement Covers

The Convenio Bilateral de Seguridad Social entre México y España is a treaty between IMSS (Instituto Mexicano del Seguro Social) and Spain's INSS (Instituto Nacional de la Seguridad Social). It has been in effect for decades and was updated with new coordination protocols in 2022.

The agreement does four things:

1. Prevents double contributions. A Mexican worker covered by IMSS does not have to simultaneously contribute to the Spanish social security system for up to two years (renewable), provided they have the correct certificate.

2. Totalizes pension periods. If you have worked in Mexico and contributed to IMSS, those contribution years count toward your Spanish pension entitlement and vice versa. If you have 15 years of IMSS contributions and later work 10 years in Spain under INSS, both systems can coordinate those periods when calculating your pension eligibility.

3. Coordinates healthcare access. The agreement establishes terms under which workers can access healthcare in the host country without duplicate enrollment in both systems.

4. Protects self-employed and transferred workers. Intra-company transfer workers and some self-employed individuals can continue contributing to their home country system for a defined period.

The Certificate of Coverage (Certificado de Cobertura)

The mechanism that activates the "no double payment" protection is a document called the Certificado de Cobertura (also referred to as Form TA.300 or ESP-MEX.1). This is issued by IMSS in Mexico.

Here is how it works:

1. Your employer (or you, if self-employed) requests the Certificado de Cobertura from IMSS before you begin working in Spain.
2. IMSS issues the certificate confirming that you are covered under the Mexican social security system.
3. You present this certificate to the Spanish social security authorities (Tesorería General de la Seguridad Social).
4. The Spanish system records your exemption from contributing to RETA or the general Spanish SS regime for the duration specified in the certificate (typically up to 2 years, renewable once for a total of up to 4 years with approval from both agencies).

During this period, you continue paying IMSS contributions in Mexico. You do not contribute to the Spanish system. Your Mexican pension continues accumulating.

The Healthcare Catch

Using the Certificado de Cobertura comes with a condition that many Mexicans discover too late: exemption from Spanish social security means you are not automatically enrolled in Spain's public healthcare system (Sistema Nacional de Salud).

Spain's public healthcare for residents normally flows through social security registration. If you are exempted from contributing, you do not automatically get an SNS health card.

This means you must maintain private health insurance with specific characteristics:

• No copayments (sin copago)
• No waiting periods (sin periodos de carencia)
• Full coverage equivalent to the public system

These same requirements appear on every Spanish visa application. Policies from Sanitas, Mapfre, Asisa, or ASISA-Asisalud are commonly used because they have strong presence in both countries and issue the specific certificate format Spanish authorities accept.

What Happens if You Don't Use the Certificado de Cobertura

If you arrive in Spain as a self-employed person (working under the Digital Nomad Visa with freelance income, or registering as autónomo) and do not have the Certificado de Cobertura, you are required to register with RETA — Spain's self-employed social security regime. RETA contributions in 2026 range from approximately €200/month for low-income new entrants (under the 2023 RETA reform's graduated base system) to over €500/month for those earning above the minimum base.

The practical calculation: if your IMSS contributions in Mexico total roughly $2,000–$3,000 MXN/month (depending on your salary), continuing them while avoiding RETA can save €200–€300/month compared to paying into both systems. The Certificado de Cobertura is worth obtaining.

Totalizing Periods for Pension Eligibility

For Mexicans who have worked many years in Mexico under IMSS before moving to Spain, the totalization clause is valuable. Spain requires a minimum number of contribution years (currently 15 years for access to any contributory pension). If you only work in Spain for 10 years, you might not independently meet that threshold.

Under the bilateral agreement, your IMSS contribution years count toward the Spanish threshold. Spain and Mexico coordinate the calculation: Spain uses the combined total years to determine if you qualify, but pays only the proportion corresponding to the years you contributed in Spain. Mexico does the equivalent calculation for its system.

This prevents a situation where someone with 20 years of Mexican contributions and 10 years of Spanish contributions ends up with zero pension entitlement in either country due to failing to meet either system's minimum threshold independently.

Requesting the Certificado de Cobertura: Practical Steps

1. Contact your IMSS local office (or your employer's HR department) and request Form TA.300 / ESP-MEX.1
2. Provide documentation of your upcoming employment or self-employment in Spain (employment contract, visa approval, or equivalent)
3. IMSS processes the request and issues the certificate
4. You bring the original certificate to Spain and present it to the Tesorería General de la Seguridad Social (TGSS) along with your work visa and NIE/TIE
5. TGSS records your exemption

If the initial two-year period approaches and you are still working in Spain, both IMSS and INSS must approve a renewal extension. This is not automatic and requires a formal request before the original certificate expires.

For Employed Workers vs. Digital Nomads

Employed workers under a Spanish company typically have social security handled by their employer. If the company is a Spanish subsidiary of a Mexican company, the bilateral agreement may apply for intra-company transfers. If you are directly hired by a Spanish firm with no Mexican connection, you will likely be enrolled in the standard Spanish INSS system, and the Certificado de Cobertura may not apply.

Digital Nomad Visa holders working for clients or employers outside Spain are the most common users of the Certificado de Cobertura, because their work relationship remains outside Spain and their IMSS coverage was already established.

The Mexico to Spain Work Visa Guide includes a full breakdown of the social security decision — Certificado de Cobertura vs. RETA registration — with a cost comparison and the exact forms needed for each path.

See more Spain guides →