Thai Citizenship: How to Apply in 2026

Obtaining Thai citizenship provides a number of tangible advantages for living in this country: the opportunity to conduct business without restrictions, purchase and own real estate and land, and stay in Thailand for an unlimited number of days a year. However, according to Thai law, only a small group of people can obtain citizenship of this country: even if they are born in the territory of the state, not everyone has the right to citizenship.

Getting Citizenship in Thailand

Obtaining Thai citizenship is possible in several ways: by right of blood and by naturalisation.

A child acquires Thai nationality by descent if at least one parent is a Thai national, regardless of where the child is born.

Birth in Thailand to foreign parents does not automatically confer Thai nationality. Eligibility depends on the parents' status at birth and the exceptions in Section 7 bis of the Nationality Act.

It is possible for foreign citizens to obtain Thai citizenship by naturalisation — upon marriage to a Thai citizen or upon residence in Thailand for a certain number of years.

Thailand Citizenship by Naturalisation

The main requirements for ordinary naturalisation are legal adulthood, good conduct, a stable lawful income, knowledge of Thai and at least five years of continuous domicile in Thailand. The official guidance counts that period from a residence certificate, alien certificate or qualifying civil-registry entry.

Stages of Obtaining Citizenship by Naturalisation

1. Obtain qualifying status. Ordinary naturalisation requires a residence certificate, alien certificate or qualifying civil-registry entry.
2. Meet the conditions. Maintain domicile in Thailand for at least five years, with lawful income, good conduct and Thai-language ability.
3. Apply. Submit documents and complete the checks and interview; a ministerial decision and royal approval are required.
4. Take the oath. After approval, citizenship is recorded in the Royal Gazette.

List of Required Documents

To apply for citizenship, you must prepare the following documents:

• a valid international passport with copies of all pages;
• birth certificate;
• application for Thai citizenship;
• a contract for the purchase or long-term rental of housing in Thailand;
• tax declaration;
• health insurance valid in Thailand;
• certificate of absence of criminal record;
• a certificate confirming language proficiency;
• marriage certificate (if applicable).

All documents must be apostilled in the country of residence, as well as translated into Thai.

Reasons for Refusal to Obtain Citizenship

Obtaining citizenship by naturalisation is a long process, sometimes taking several years. The Ministry of Internal Affairs of Thailand carefully checks each application, but, according to statistics, it issues passports to only 25% of those who wish.

The main reasons for refusal may include the following:

• lack of sufficient justification for obtaining a Thai passport;
• insufficient period of residence in the country with a residence permit;
• insufficient knowledge of the language and integration into society;
• incorrectly filled out tax returns or a rental agreement;
• insufficient financial resources;
• suspicion of fraudulent marriage.

Benefits of Thai Citizenship

As of 2025, Thailand holds the 50th position in the Passport Index Power Rank, allowing its citizens visa-free access to 45 countries and visa-on-arrival entry to 51 countries. With a Thai passport, you can travel to most Asian countries, as well as Latin America.

Among the main advantages of a Thai passport are the following:

• there is no time limit for staying in Thailand;
• the ability to run a business without restrictions;
• the opportunity to own land and real estate in Thailand;
• high-quality and affordable medical care and education;
• benefits for visiting Thai cultural attractions;
• the right to participate in the political life of Thailand.

The Tranio team is professionally engaged in the selection of real estate in Thailand. Our experts are ready to answer your questions.

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