Cross-Border Remote Work in 2026: A Comprehensive Guide for Residents in Spain with Companies in Portugal and France

Remote work has democratized access to job opportunities, allowing Spanish professionals to collaborate with companies located in Portugal and France without needing to relocate physically. As we move towards 2026, it is crucial to understand the legal and fiscal framework governing this modality, especially with the potential entry into force of new bilateral agreements.

New Bilateral Agreements (2026 Updates)

It is anticipated that in 2026, updated bilateral agreements will come into effect between Spain and Portugal, and between Spain and France, specifically designed to regulate cross-border remote work. These agreements aim to simplify tax and social security management for workers who reside in one country and work for a company in another. Although the final details are pending official publication, they are expected to facilitate:

• Clarity in Taxation: More precisely define where the worker should be taxed.
• Flexibility in Social Security: Establish criteria for determining which social security system to contribute to.
• Reduced Bureaucracy: Streamline administrative procedures for companies and workers.

Tax Residency: The 183-Day Rule and Center of Vital Interests

Determining tax residency is fundamental to understanding where taxes should be paid. The general rules remain:

• 183-Day Rule: If you spend more than 183 days a year in Spain, you will generally be considered a Spanish tax resident. The same rule applies in Portugal and France.
• Center of Vital Interests: Even if you do not meet the 183-day rule, if your center of economic and personal interests (family, main residence, usual economic activities) is located in Spain, you could be considered a tax resident.

Important: Cross-border remote work can lead to situations of dual tax residency if not managed properly. It is vital to be aware of where your center of life is considered to be in order to avoid conflicts with tax authorities.

Social Security Implications: Where Do You Contribute?

Social security is a complex aspect of cross-border work. The general rule states that you must contribute to the social security system of the country where the work is performed. However, with remote work, this becomes complicated:

• Occasional/Limited Remote Work: If you occasionally work from Spain for a company in Portugal or France, you will likely have to continue contributing to the company's country's social security system. New agreements might establish specific day limits to maintain contributions in the company's country of origin.
• Regular/Exclusive Remote Work in Spain: If your position is essentially remote and your operational base is in Spain, the tendency is that you will have to contribute in Spain. This implies registering as a self-employed worker in Spain (RETA) or, if a Spanish company hires you, that they contribute on your behalf.

A1 Certificate: If you are temporarily working in another EU country (even if it's your country of residence), you may need an A1 Certificate to prove which country you are contributing to. Consult with the social security authorities of your country of residence.

Double Taxation Treaties and How to Claim Deductions

Spain, Portugal, and France have double taxation treaties to prevent citizens from paying taxes twice on the same income. These treaties establish mechanisms such as:

• Tax Credit: The country of residence allows you to deduct the tax paid in the country of origin of the income, up to the limit of the tax you would have to pay in your country of residence.
• Exemption: In some cases, income earned in the other country may be exempt from taxes in your country of residence.

Procedure: To claim the deduction, you will generally need to submit documentation proving your income and the taxes paid in the other country along with your tax return in Spain.

Practical Examples: Living in Badajoz, Working for a Company in Lisbon

Case 1: Spanish tax resident in Badajoz, teleworking 80% of the time from Spain for a company in Lisbon.

If you spend more than 183 days in Spain and your center of interests is in Badajoz, you are a Spanish tax resident. Your income from the Portuguese company must be declared in Spain. Depending on the bilateral agreement and social security arrangements:

• Social Security: You might have to contribute in Portugal as a posted worker (if considered temporary) or register as self-employed in Spain if it's determined that your activity is predominantly carried out there. The new 2026 agreements could clarify this, possibly allowing for longer periods under the Portuguese social security system up to a certain annual day limit in Spain.
• Taxes: You would be taxed in Spain on your income. You could apply the tax credit for taxes paid in Portugal (if any and withheld by the company) to avoid double taxation.

Scenario with Trybiut: A tool like Trybiut would help you calculate how much tax you should pay in Spain, consider potential Portuguese withholdings, and optimize your tax return.

Digital Nomad Visa Holders vs. Regular Residents

The legal and fiscal situation of Digital Nomad Visa holders differs from that of regular tax residents of Spain, Portugal, or France.

• Digital Nomads: These visas typically have specific requirements regarding duration of stay and tax residency. They are often designed to allow working for companies outside the country of residence without establishing permanent tax residency there. However, it is crucial to review the exact conditions of each visa and country. In 2026, there might be clarifications on how these visas interact with cross-border remote work agreements.
• Regular Residents: If you are a tax resident in Spain, Portugal, or France, the general taxation and social security rules mentioned above apply.

Required Documentation and Forms

The necessary documentation will vary depending on your situation, but generally will include:

• For Taxes:
• Tax residency certificate.
• Proof of income and withholdings (payslips, invoices if self-employed).
• Proof of taxes paid in the country of origin (if applicable, to claim deductions).
• Relevant tax return form in your country of residence.
• For Social Security:
• A1 Certificate (if applicable).
• Documentation proving the employment relationship and location of the activity.

Cross-Border Healthcare Coverage

EU citizens who work remotely across borders generally have healthcare coverage in their country of residence through their local social security system. If you need medical attention in the country where your company is located (Portugal or France), you can use the European Health Insurance Card (EHIC) to receive necessary medical care during your stay, under the same conditions as local residents.

Important: The EHIC covers necessary and urgent medical care. For broader or planned coverage, it is advisable to check the specific coverage of your country of residence or consider additional private health insurance.

Comparative Table: Spain vs. Portugal vs. France (Taxation and Social Security)

This table provides a general and simplified overview. Actual rates and benefits can vary considerably depending on individual circumstances, applicable deductions, and current specific legislation.

Aspect	Spain	Portugal	France
IRPF (Personal Income Tax) - Top bracket approx.	~47%	~48%	~45%
Social Security (Employee - approx. %)	~6.4% - 11.5% (depending on the regime)	~11%	~20%-25%
Social Security (Employer - approx. %)	~30%-36%	~23.75%	~40%-45%
Special Tax Regimes for Foreign Workers	Yes (e.g., regime for posted workers, but with specific requirements)	Non-Habitual Resident (NHR) regime - undergoing modification/sunset, but with significant past implications. Consult current status.	Yes (e.g., tax expatriates with certain conditions)
Common Social Benefits	Public healthcare, pensions, unemployment, sick/maternity/paternity leave.	Public healthcare, pensions, unemployment, sick/maternity/paternity leave.	Public healthcare, pensions, unemployment, sick/maternity/paternity leave.

Note:

Tax and social security percentages are approximate and for high income brackets or contribution bases. The existence of double taxation treaties and social security agreements is key to avoiding double burdens.

Real Cases with Numbers (Illustrative Examples)

Case A: Juan, resident in Valencia (Spain), works remotely for a company in Paris (France).

• Annual Gross Salary: €50,000
• Tax Residency: Spain.
• Social Security Contributions: Juan contributes in Spain as self-employed (estimate: €400/month = €4,800/year). The French company might have to register him as a non-resident worker in France, or Juan must manage his self-employment registration in Spain. Let's assume he contributes in Spain.
• Tax in France (Withholding): If the French company withholds taxes according to French law, it could be a percentage. However, as a Spanish tax resident, the income is declared in Spain.
• Tax Return in Spain: Juan declares €50,000 in Spain. The tax payable is calculated according to the Spanish scale. If, under the bilateral treaty, a portion is considered taxable in France, he can apply the tax credit to deduct taxes paid in France (if any and documented) from his Spanish tax.
• Estimated Result (simplified): The net tax in Spain could be significantly lower than if taxed twice. Managing the documentation for the tax credit is crucial.

Case B: María, resident in Cascais (Portugal), works remotely for a company in Seville (Spain).

• Annual Gross Salary: €40,000
• Tax Residency: Portugal.
• Social Security Contributions: If she works for a Spanish company, the Spanish company might be obligated to contribute for her in Spain (if a temporary posting is recognized) or María must register as self-employed in Portugal. Let's assume she contributes in Portugal (estimate: €300/month = €3,600/year).
• Tax in Spain: The Spanish company might withhold Spanish income tax.
• Tax Return in Portugal: María declares €40,000 in Portugal. The Spain-Portugal double taxation treaty will allow her to apply the tax credit for taxes withheld by the Spanish company (if any), reducing the total tax burden.

Trybiut: With these figures, Trybiut can simulate the tax impact in Portugal, potential withholdings in Spain, and help you optimize your tax situation by calculating multi-currency taxes and facilitating international income management.

Frequently Asked Questions (FAQ)

1. Am I a tax resident in Spain if I work remotely for a company in Portugal but spend most of the year in Spain?

   Yes, if you spend more than 183 days in Spain or your center of vital interests is in Spain, you will be considered a Spanish tax resident, regardless of where your employer is located.

2. Do I have to pay taxes in Spain and in Portugal/France if my company is there and I live in Spain?

   Generally, no, if you correctly apply double taxation treaties. You will declare your income in your country of tax residency (Spain) and can deduct taxes paid in the other country (Portugal/France) to avoid double taxation.

3. What happens to my social security if I work full-time remotely from Spain for a French company?

   The situation can be complex. If your activity is predominantly carried out in Spain, you might have to register as self-employed in Spain. If the French company manages a temporary posting, you might continue contributing in France for a limited period. It is crucial to consult with the social security authorities of both countries or a specialized advisor.

4. Will the new bilateral agreements in 2026 simplify bureaucracy for cross-border remote work?

   It is expected so. The agreements are designed to provide greater clarity and predictability in tax and social security matters, which should translate into simplified procedures.

Related Articles

• Comprehensive Guide to the Digital Nomad Regime in Spain
• Taxation of Remote Work in the European Union
• Social Security for Cross-Border Workers: EU Regulations

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