Thailand's Immigration Act allows officers to refuse entry to a foreigner who has been imprisoned by a court judgment, in Thailand or abroad, unless the offense was petty, caused by negligence or exempted by regulation. The text sets no minimum sentence length, and a refusal is not automatic: the officer at the border decides. If you have a prison sentence on your record, ask the Thai embassy before you travel.
This page explains what the law actually says, where online claims go wrong, and which visas ask you for a police certificate. It is a summary of public sources, not legal advice. Your own case depends on the details of your conviction and on decisions made by Thai officials, so for anything beyond the general picture, speak to the Thai embassy or consulate in your country or a lawyer qualified in Thai immigration law.
The law in brief (checked October 2026)
- Law
- Immigration Act B.E. 2522 (1979), Section 12
- Main ground
- Section 12(6): imprisonment by a Thai or foreign court judgment
- Exceptions
- Petty offenses, negligence, offenses exempted by Ministerial Regulation
- Minimum sentence in the text
- None
- Suspended sentence
- Held not to count by the Supreme Administrative Court (case A.696/2561)
- Who decides
- The immigration officer at the point of entry
What Section 12 of the Immigration Act says
Section 12 lists the groups of foreigners who are "excluded from entering into the Kingdom". Most of the list has nothing to do with crime: it covers people without a valid passport or visa, people without means of support, and some health grounds. The criminal-record ground is number 6. In the English translation, it covers a person:
"Having been imprisoned by the judgement of the Thai Court; or by a lawful injunction; or by the judgement of the Court of foreign country, except when the penalty is for petty offense or negligence or is provided for as an exception in the Ministerial Regulations."
Three things stand out. The ground applies to foreign convictions as well as Thai ones. It speaks of being imprisoned, not just of being convicted. And it carves out three exceptions: petty offenses, offenses of negligence (a careless-driving case, for example, rather than a deliberate crime) and anything a Ministerial Regulation exempts. We could not find whether such a regulation exists or what it lists, so we cannot say which offenses, if any, it covers.
The English text is an unofficial translation. Where it differs from the Thai original, the Thai text is the law.
The "one year or more" claim is not in the Act
Many websites say Thailand refuses entry only to people sentenced to a year or more in prison. That threshold does not appear in Section 12(6). The text covers imprisonment of any length, subject to the three exceptions above. The one-year figure seems to come from other laws, such as the Deportation Act, and has been copied into travel advice about entry.
The opposite claim, that any conviction at all bars you, is also not what the text says. The Act refers to imprisonment. A conviction that ended in a fine alone is not addressed in Section 12(6), and we have found no official source that says how officers treat it.
A short prison sentence can still fall under Section 12(6). Because the text has no minimum length, do not assume that a sentence of a few weeks or months is safe to ignore. Whether it counts depends on the offense and on the officer's decision, which is why the embassy is the right place to ask.
Suspended sentences: what the court decided
Thailand's Supreme Administrative Court has looked at the meaning of "imprisoned" in Section 12(6). In case A.696/2561, summarized by the court in July 2022, a foreigner had been sentenced in Thailand to three years in prison and a 7,000-baht fine, but the prison term was suspended. The court held that he "had not been imprisoned by the judgment of the Thai Court", so he could not be excluded on that ground.
The court also rejected the second ground the authorities had used, Section 12(7), because he had lived in Thailand without committing further crimes and was unlikely to be a danger to the public. A court summary of one case is not a guarantee for anyone else, but it shows that the word "imprisoned" is read literally: a sentence that was never served in prison was not treated as imprisonment.
Other grounds that can matter
Section 12 has other grounds that can apply to someone with a past, even without a prison sentence:
- 12(7): behavior suggesting a danger to public peace, safety or national security, or being under a warrant of arrest issued by officials of a foreign government.
- 12(8): reason to believe the person is entering for prostitution, trafficking in women or children, drug smuggling or other smuggling.
- 12(10): a person the Minister has prohibited from entering under Section 16.
- 12(11): having been deported by Thailand or another country, or having had a right of stay revoked, unless the Minister grants an individual exemption.
The last ground is the one many travelers meet in practice, because a Thai deportation often follows an overstay or an arrest. Our page on overstaying in Thailand explains the re-entry bans that follow. Since August 2026, the UK Foreign Office reports, foreigners can also be deported without a conviction if their conduct is judged contrary to public order, as our guide to the monarchy and the lèse-majesté law describes.
What happens at the border
Section 12 describes who is excludable; it does not say every such person will be turned away. The decision is made by the immigration officer at the airport or land crossing. Thailand does not publish which foreign criminal records its officers can see, or which databases they check, so nobody outside the Immigration Bureau can tell you whether your record will show up.
What you can rely on is this: arriving visa-exempt or with a visa, and with your digital arrival card filed, does not remove the officer's power under Section 12. Refusals for other reasons, such as missing proof of onward travel or funds, are covered in our guide to the Thailand visa exemption.
Answer every question from officials truthfully. Giving false information on a visa application or to an immigration officer creates a separate problem of its own, and we never advise anyone to hide a conviction.
Visas that require a police certificate
Some long-stay visas ask for a criminal record certificate as part of the application, which means your record is assessed before you travel rather than at the border. As of October 2026, the official e-Visa portal lists one for the Destination Thailand Visa (DTV), and our guide to retirement visas shows which of the retirement routes need one. Teachers applying for a Non-B visa also need one, as our page on teaching English in Thailand explains.
Those pages cover the certificate as a document: who issues it, how recent it must be and how to submit it. The point for this page is simpler. If your certificate shows a conviction, the embassy will see it, and the visa decision will tell you more about your position than guessing at the border would. A short tourist trip on the tourist visa or visa exemption does not involve a certificate.
When to ask the embassy, and what to ask
Ask before you book if any of these apply to you:
- you have served time in prison for any offense, in any country;
- you have been deported from Thailand or any other country;
- you are under investigation, on bail or subject to an arrest warrant abroad;
- your conviction was for drugs, trafficking or violence.
Write to the Royal Thai Embassy or Consulate-General that covers the country where you live. Give the offense, the date, the sentence imposed and what was actually served, and ask whether Section 12 of the Immigration Act would apply. Keep the reply. For anything complex, such as several convictions or a past deportation, a lawyer who handles Thai immigration cases can advise on your specific situation. Your own country's embassy can help with consular matters, but the entry decision belongs to Thai immigration.
Read your travel insurance policy too, and check what it says about refused entry before you rely on it.
Frequently asked questions
Can I travel to Thailand with a criminal record?
It depends on the conviction. The Immigration Act lets officers refuse anyone who has been imprisoned by a court judgment, except for petty or negligent offenses. If you have served a prison sentence, ask the Thai embassy before you travel.
Does Thailand ban people sentenced to more than one year?
No such threshold appears in Section 12(6) of the Immigration Act. The text covers imprisonment of any length, with exceptions for petty offenses, negligence and offenses exempted by Ministerial Regulation. The "one year" figure found online is not in that section.
Does a suspended sentence count?
In case A.696/2561, the Supreme Administrative Court held that a foreigner whose prison sentence was suspended had not been "imprisoned" under Section 12(6). That is one case, not a guarantee, but it shows the word is read as actual imprisonment.
Does a driving conviction stop me entering Thailand?
Offenses of negligence are excepted in Section 12(6), and a fine alone is not covered by that section. A deliberate offense that led to prison is a different matter. If in doubt, give the embassy the details and ask.
Will Thai immigration know about my conviction?
Thailand does not publish which foreign records its officers can see. Visas such as the DTV require a police certificate, so for those your record is seen before travel. Always answer officials truthfully.
Sources
- Immigration Act B.E. 2522 (1979) – unofficial English translation, via ecoi.net (checked October 2026)
- Administrative Court of Thailand – Case A.696/2561 summary (checked October 2026)
- Ministry of Foreign Affairs – Thai e-Visa portal (checked October 2026)
- UK Foreign, Commonwealth & Development Office – Thailand: entry requirements (checked October 2026)
- UK Foreign, Commonwealth & Development Office – Thailand: safety and security (checked October 2026)