Portugal has become one of the most sought-after destinations for people wanting to relocate, and for good reason. The weather is excellent, the cost of living is reasonable, and the country sits at the heart of the European Union.

But for many people, the goal goes beyond simply moving here. They want Portugal’s citizenship, the ability to hold a Portuguese passport alongside their existing nationality, with full access to everything that comes with it.

This guide covers everything you need to know about Portugal dual citizenship. From how Portuguese nationality law works to the different eligibility routes, the exact documentation required, and what to expect from the application process.

What is dual citizenship and how does it work?

Dual citizenship means holding legal nationality in two countries simultaneously. You carry two valid passports, enjoy rights in both countries, and are subject to obligations in both as well.

Those obligations can include taxation, civic duties, and legal responsibilities. The rules vary significantly depending on which two countries are involved.

Rights you typically hold in both countries:

• The right to live and work without a visa
• Access to public services including healthcare and education
• The ability to vote in national elections
• Property ownership rights
• Consular protection when travelling

Obligations you may face:

• Tax filing requirements (even if you owe nothing)
• Military service registration in some countries
• Compliance with the laws of both nations

Different countries take very different approaches to dual nationality. Some actively prohibit it and require citizens to renounce their original nationality before acquiring a new one. Others permit it outright with no conditions attached. Portugal sits firmly in the second camp.

Does Portugal allow dual citizenship?

Yes, Portugal allows dual citizenship without restriction. Portuguese nationality law explicitly permits citizens to hold multiple nationalities. There is no requirement to renounce your existing citizenship when you acquire Portuguese nationality. 

This applies whether you are acquiring citizenship through naturalisation, descent, marriage, or any other recognised route. Triple citizenship is also legally permitted under Portuguese law. So if you already hold two passports and wish to add a Portuguese one, nothing in Portuguese legislation prevents that.

It is worth understanding one important distinction: citizenship and tax residency are separate concepts. Acquiring Portuguese citizenship does not automatically make you a Portuguese tax resident. Tax residency is determined by where you actually live, not which passports you hold.

However, while Portugal allows dual nationality, your existing country of citizenship may not. Most countries now permit dual nationality, but some still require renunciation. Always confirm your home country's position before beginning an application.

Dual citizenship between Portugal and the United States

The United States does not require citizens to renounce their nationality when acquiring citizenship elsewhere. The US government's position is that Americans may hold foreign nationalities, although the State Department does not formally encourage it. 

In practice, tens of thousands of Americans hold dual US-Portuguese citizenship. Portuguese nationals acquiring US citizenship are similarly not required to renounce their Portuguese passport under Portuguese law.

US taxation for dual citizens

The United States operates a worldwide taxation system. This means US citizens are required to file a federal tax return every year regardless of where they live in the world. 

Even after becoming a Portuguese citizen and relocating to Portugal full time, your US tax obligations do not disappear. You will need to file annually with the IRS, report your Portuguese income, and comply with FBAR and FATCA requirements if you hold foreign financial accounts.

Portugal's tax system

Portugal taxes residents based on residency, not citizenship. If you live in Portugal and are a tax resident here, you pay Portuguese income tax on income earned in Portugal. Foreign-sourced income may also be taxable depending on your specific circumstances and which tax regime applies to you.

The US-Portugal tax treaty

The US and Portugal have a tax treaty in place designed to prevent double taxation. It allows taxpayers to use credits for taxes paid in one country against their liability in the other. This significantly reduces the risk of paying tax twice on the same income, but the mechanics are complex.

If you are a US citizen relocating to Portugal, working with advisers who understand both systems is essential, not optional.

Portugal dual citizenship eligibility for US citizens

There are several recognised routes to acquiring Portugal dual citizenship. The right route for you depends on your personal circumstances.

Citizenship by descent (Portuguese parent)

If one of your parents was a Portuguese citizen at the time of your birth, you may be entitled to Portuguese citizenship automatically. You do not need to have been born in Portugal, and there is no minimum residency requirement.

Required documentation:

• Your full long-form birth certificate
• Your Portuguese parent's passport or citizen card
• Proof that your parent retained Portuguese nationality at the time of your birth

This is one of the most straightforward routes, provided the documentation exists and is in order.

Citizenship by descent 

If a grandparent was Portuguese, the route is available but involves additional conditions. Your grandparents must have retained Portuguese nationality. You should also be able to demonstrate a genuine connection to the Portuguese community through speaking Portuguese language 

Required documentation:

• Your grandparent's birth certificate
• Your parent’s who is a the son/daughter of a Portuguese citizen birth certificate
• Documents establishing the chain of relationship from grandparent to you
• A recognised Portuguese language certificate

Citizenship by birth in Portugal

Being born in Portugal does not automatically confer citizenship, but it can be a qualifying factor in certain situations.

The rules differ depending on when you were born and the status of your parents at the time of your birth. If you were born in Portugal to foreign parents who were legal residents, you may be eligible to apply. Minor children born in Portugal whose parents later acquire Portuguese nationality may also qualify.

The specific documentation required varies based on your individual circumstances, but will typically include birth registry records,, and residence documentation for your parents

Citizenship by naturalisation (five-year residency route)

This is the most common route for people who relocate to Portugal through a visa pathway. After a period of continuous legal residence, you become eligible to apply for Portuguese citizenship through naturalisation.

Portugal's Parliament has approved a reform to the Nationality Law. The new rules extend the minimum residency period from five years to 10 years for most foreign nationals. EU and CPLP (Community of Portuguese Language Countries) citizens qualify after seven years. The reform is awaiting presidential approval and publication in the Diário da República before it enters into force. Applications submitted before that date will still be processed under the current five-year rule.

Under the new rules, the residency clock starts from the date your first residence card is issued. Not from when you submitted your application. This is an important distinction that could add several months to the effective waiting period.

Eligibility checklist:

• 10 years of legal residence in Portugal (7 for EU and CPLP citizens)
• A valid and uninterrupted residence permit history
• A2-level Portuguese language proficiency
• A clean criminal record with no conviction carrying a sentence of two or more years
• Proof of financial self-sufficiency
• Cultural and civic knowledge requirements (specific details still to be confirmed through secondary regulations)

Eligible residence visas include:

• D7 visa (passive income visa)
• D8 visa (digital nomad visa)
• Golden Visa
• Work visa
• Startup visa
• Family reunification visa

If you are currently exploring which visa suits your situation, our guide on Portugal residency is a good starting point.

Citizenship through marriage or civil partnership

If you are married to or in a legally recognised civil partnership with a Portuguese citizen, you may apply for citizenship after a minimum of three years.

Physical residence in Portugal is not strictly required for this route, but you must demonstrate a genuine connection to the Portuguese community. Language proficiency may also be assessed.

How to prove your connection to the Portuguese community

You can submit any of the following as evidence:

• A statement from your employer or from Social Security
• School reports of your children born or registered in Portugal
• Your IRS tax return
• Payslips
• Utility bills such as water, electricity, or rent receipts

Your connection is automatically recognised if, on the date of your application, you meet any of these conditions:

• You have been married or in a de facto union for at least 6 years.
• You have been married or in a de facto union for at least 5 years and can prove knowledge of the Portuguese language.
• You have been married or in a de facto union for at least 5 years and were born in and are a national of a Portuguese-speaking country.
• You have children in common with Portuguese nationality.
• You have had legal residence in Portugal for at least 5 years.
• You have had legal residence in Portugal for at least 3 years and can prove you are studying in Portugal or have knowledge of the Portuguese language.

Required documentation:

• Marriage certificate, apostilled and certified translated into Portuguese
• Your Portuguese spouse's identification documents

Citizenship through adoption

A child under the age of 18 adopted by a Portuguese citizen may acquire Portuguese citizenship automatically. This requires court approval and compliance with Portuguese family law requirements. Residency and integration conditions may also apply depending on individual circumstances.

Citizenship through overseas territories

Portuguese citizenship acquired through residence in the Azores or Madeira follows the same national rules as mainland Portugal. Both archipelagos are autonomous regions of Portugal. Residency in either territory counts towards naturalisation requirements in exactly the same way as mainland residency.

Regardless of which route you are applying through, certain documentation is standard across most applications.

Portugal dual citizenship requirements

Portugal dual citizenship requirements typically include:

• Completed application form, submitted in Portuguese
• Valid passport, with certified copy
• Long-form birth certificate, apostilled and translated if not in Portuguese language
• Residence permit covering the required period, if applicable
• Police clearance certificates from:
• Portugal
• Any country where you have lived for more than one year
• A2 Portuguese language certificate
• Marriage certificate, if applicable
• Proof of application fee payment

Portuguese language test

Most applicants must demonstrate A2-level proficiency under the Common European Framework of Reference (CEFR). The standard exam used for this purpose is the CIPLE.

The CIPLE exam takes approximately two hours to complete. It is divided into four sections: reading, writing, listening, and speaking, all designed to assess basic Portuguese language proficiency at the A2 level.

Exemptions apply to:

• Those with severe documented health conditions
• Nationals of Portuguese-speaking countries
• Children under the age of 10
• Applicants with certain special needs

Criminal record requirements

You must have no conviction that would carry a sentence of three or more years under Portuguese law. For US citizens, this means providing an FBI background check alongside Portuguese police clearance. Both must be apostilled and accompanied by a certified Portuguese translation.

How to get dual citizenship in Portugal: Step-by-step

If you are already legally residing in Portugal through the right visa pathway, such as the D7, D8, D2, or Golden Visa, the path to Portugal dual citizenship becomes a matter of meeting the required residency period and completing the formal application process.

1. Confirm you meet the residency requirement

If you are applying through naturalization, you must have legally lived in Portugal for the required years. This means holding a valid residence permit and maintaining lawful status throughout that period.

If you qualify through another route, such as descent or marriage, different timelines may apply. The most common pathways include:

• Descent: If one or both of your parents are Portuguese citizens. In some cases, grandparents may also qualify you.
  
• Marriage or long-term partnership: If you have been married to or in a legally recognized partnership with a Portuguese citizen for at least three years.
  
• Naturalization: After five years of legal residence in Portugal.
  
• Sephardic Jewish ancestry: If you can prove documented descent from Portuguese Sephardic Jews.
  
• Birth or adoption in Portugal: Certain conditions may allow citizenship through birth or adoption.

For most expats who relocate through a visa, naturalization after five years of legal residence is the typical route.

2. Ensure your current country allows dual citizenship

Portugal allows dual nationality. However, you should confirm whether your home country permits it as well.

For example, U.S. citizens can hold both American and Portuguese citizenship without renouncing either nationality. Some countries, however, may require you to give up your original citizenship.

3. Maintain legal residency and clean records

During your residence period, you must:

• Keep your residence permit valid and renewed on time
• Maintain a clean criminal record in Portugal and in your country of origin

Interruptions in legal status can delay your eligibility.

4. Demonstrate basic Portuguese language proficiency

Most applicants must prove A2-level Portuguese language skills.

This is typically done by passing the CIPLE exam, which tests basic comprehension and communication abilities. The level required is modest and focuses on everyday language.

Some applicants, particularly those applying through descent, may be exempt depending on their specific circumstances.

5. Prepare your required documentation

Required documents vary depending on your application route, but typically include:

• Full birth certificate (translated and legalized if issued abroad)
  
• Proof of legal residency in Portugal
• Criminal background checks from Portugal and your home country
• Marriage certificate, if applying through marriage
• Portuguese language certificate (A2 level)
• Documentation proving ancestry, if applying through descent

Accuracy and proper legalization of documents are critical to avoid delays.

6. Submit your citizenship application

Applications can be submitted:

• At a Civil Registry Office (Conservatória)
• Through the Instituto dos Registos e Notariado (IRN)
• Through a qualified lawyer or legal representative

At this stage, your five-year residency clock must already be complete if applying through naturalization.

7. Wait for processing and possible additional requests

Citizenship applications typically take between six months and over a year to process.

Authorities may request additional documents or clarifications during review. Prompt responses help avoid further delays.

8. Receive your Portuguese documents

Once approved:

• You will be issued a Portuguese birth registration
• You can apply for your Portuguese citizen card (Cartão de Cidadão)
• Then you may apply for a Portuguese passport

At that point, you are officially a Portuguese citizen.

9. Retain both nationalities (if permitted)

If your country of origin allows dual citizenship, you do not need to renounce your original nationality. You may legally hold both passports.

What happens if your application is rejected

You can appeal the decision. You can request reconsideration of the decision by submitting additional evidence or clarification to the reviewing authority. If that is unsuccessful, judicial review through the Portuguese courts is available, though this adds time and cost to the process.

Working with a qualified immigration lawyer from the outset significantly reduces the risk of rejection. Errors in documentation and incomplete submissions are among the most common reasons applications fail.

Benefits of Portugal dual citizenship for US citizens

EU freedom of movement

A Portuguese passport gives you the right to live, work, and study in any of the 27 EU member states, plus access to the EEA and Switzerland. That is a significant expansion of your options.

Portuguese passport strength

The Portuguese passport consistently ranks among the most powerful in the world, offering visa-free or visa-on-arrival access to over 185 countries including the US, UK, Japan, and Australia.

No post-citizenship residency obligation

Once you hold Portuguese citizenship, you are not required to remain in Portugal. You can live anywhere in the world while retaining your Portuguese passport.

Access to Portuguese healthcare

Portuguese citizens are entitled to access the Serviço Nacional de Saúde (SNS), Portugal's national health service. Private healthcare options are also available and generally affordable by international standards.

Education access

Portuguese citizens pay EU tuition rates at Portuguese universities, which are significantly lower than non-EU rates. Access to research institutions and Erasmus programmes is also available.

Quality of life

Portugal consistently scores highly on global quality of life indices. The country is safe, politically stable, well-connected, and home to an increasingly international community. The climate is excellent, and infrastructure in major cities is strong. Our guide to the best places to live in Portugal is worth reading if you are still deciding where to put down roots.

Real estate and business opportunities

As a Portuguese citizen, you have full EU property ownership rights and the ability to establish a business anywhere in the EU single market.

Portugal dual citizenship vs permanent residency

Many people weigh citizenship against permanent residency. Here is a clear comparison.

Permanent residency is a valid status that offers stability, but citizenship provides a significantly broader set of rights and requires no ongoing renewal. For most people with long-term ambitions in Portugal or Europe, citizenship is the stronger goal. 

Your Portuguese citizenship journey starts with Touchdown

Each journey is unique, but the goal is always the same: to help you secure residency, structure your taxes with clarity, and thrive in one of the most beautiful, forward-thinking countries in Europe.

Touchdown is Portugal's leading relocation platform. Backed by a veteran team of expert lawyers, we simplify the entire relocation journey by providing everything you need to set up and thrive in your new home through an integrated, easy-to-use platform.

Whether you are just beginning to explore your options or you are already legally resident in Portugal and approaching the five-year mark, we can help you move forward with confidence. 

Book an introduction call with our team to find out which citizenship route applies to your situation, what documentation you will need, and how we can manage the process on your behalf.

FAQs 

Can US citizens get Portuguese citizenship?

Yes. US citizens can apply through naturalisation after the required period of years of legal residence, by descent, or through marriage to a Portuguese citizen, without giving up their American passport.

Does Portugal let you have dual citizenship?

Yes. Portugal fully permits dual and even triple citizenship, with no requirement to renounce your existing nationality.

What is the new law in Portugal for nationality in 2026?

Portugal has been updating its nationality framework in recent years. See our dedicated guide on Portugal citizenship changes for the latest.

Is Portugal taxed as a dual citizen?

Not necessarily. Portugal taxes based on residency, and the US-Portugal tax treaty provides foreign tax credits to prevent double taxation, though US citizens still have annual IRS filing obligations.