Thailand Marriage Visa: What You Need to Know
Marrying a Thai national gives you a real path to long term residency in Thailand, but the process comes with its own specific rules, separate from the retirement route, and one requirement that catches almost everyone off guard: immigration officers may ask you to bring a witness or witnesses who can personally confirm that your marriage is genuine. Here is the complete picture, from the paperwork to the interview itself.
Who Qualifies
To apply for this extension, you need to be legally married to a Thai national. Unlike the retirement route, there is no minimum age requirement here. What matters instead is that the marriage is properly registered and that you can show you are actually living together as a married couple, not just on paper. This applies the same way regardless of which spouse is Thai and which is foreign, and regardless of the gender of either spouse, including same sex couples since Thailand's marriage equality law took effect in January 2025. Thai Immigration treats this as a two part test: the marriage must be valid in law, and it must reflect a real, lived relationship. Both parts get checked.
What Counts as a Valid Marriage
If you married in Thailand, your marriage was registered at a local Amphur (district office), and you were issued a Kor Ror 3 marriage certificate along with a Kor Ror 2 register entry. These are already valid for use with Thai Immigration as they are, no further legalization needed.
Important: if you married abroad instead, the process below can vary significantly depending on your country of origin, and in some countries it can take weeks. Start this well before you plan to apply, ideally as soon as you marry, not once your visa deadline is already approaching.
If you married abroad, that marriage certificate needs to go through several steps before Thai Immigration will accept it. In most cases this means: legalizing the certificate in your home country first, a step whose exact form depends on the country, then having it translated into Thai, then having it validated by your own Thai embassy or consulate there, and finally legalizing it again in Thailand at the Ministry of Foreign Affairs Legalization Division. The exact order of these steps can vary depending on your country of origin, so it is worth confirming the process with your own embassy rather than assuming a fixed sequence.
Depending on your country, there may also be a separate step to formally register or transcribe the marriage into your own home country's civil records, for example at the local civil registry office, once the legalization abroad is complete. This is generally about your own country recognizing the marriage, rather than something Thai Immigration itself requires, but it is worth completing alongside the rest since it often uses the same set of legalized documents.
Once completed, the original certificate issued by your home country generally does not expire, so keep it somewhere safe. You will need to present the same legalized certificate again at every annual renewal, not just at your first application, so losing it later means starting a long process over from scratch.
A wedding ceremony alone, religious or otherwise, does not count as a legal marriage in either case. Only the official certificate does.
Financial Requirements
Before any of this, you first need to obtain the initial Non-Immigrant O visa (marriage category) from a Thai embassy or consulate abroad, which grants a 90 day stay on entry. What each embassy asks for at that stage varies, and many do not require proof of funds at this point.
The financial requirement described below applies once you are in Thailand and converting that 90 day visa into a one year extension of stay at a local immigration office, and again at every annual renewal after that. You need to show one of the following:
400,000 THB held in a Thai bank account, or
40,000 THB per month in verifiable income
This applies equally regardless of which spouse is the foreign national. The deposit must be held in a bank account in Thailand, in your own name, and needs to have been sitting there for at least two full months before you file this extension application, not before your original 90 day visa. At annual renewal, many immigration offices ask for three months of seasoning instead of two, even though this is stricter than the underlying regulation technically requires, so it is worth checking with the office handling your file rather than assuming two months will always be accepted. Some embassies have stopped issuing income verification letters altogether, in which case showing twelve months of monthly transfers of at least 40,000 THB into your Thai account is generally accepted instead.
Documents You Will Need
Prepare two copies of everything on this list, both to be submitted to immigration.
Passport, valid for at least 12 months with at least two blank pages, with a signed copy of the photo page and every page that has a visa or an entry, exit, or extension stamp on it
Completed TM.7 application form. Immigration may also ask you to sign the STM.2, STM.9 and STM.11 acknowledgement forms, which are usually handed out at the office
The STM.10 form, completed by your Thai spouse to declare and certify your relationship, if requested by the office
Recent passport style photographs, 4 x 6 cm, taken within the last six months
Your marriage certificate, prepared as described above
Your Thai spouse's ID card
Your Thai spouse's house registration (tabien baan)
Bank letter, dated within about seven days of your application, if using the bank deposit method
A 12 month statement of your deposit account is not always required, but some offices ask for it, so it is worth preparing one in advance to cover this possibility
Updated bankbook copy from the day of application, if using the bank deposit method
Proof of income, if using the income method instead
Your TM30 notification of residence
Photos of you and your spouse together at home (the couple's bedroom, the living room, the kitchen, the front of the house with the house number visible on the street, and the front of the building as well if you live in a condo)
Utility bills in both names, as evidence of cohabitation
Proof of your residence, which depends on how the property is owned:
If the owner is a Thai individual: the rental contract, with revenue stamps affixed (calculated at 0.1% of the total rent for the lease period, purchased from the Revenue Department), a copy of the owner's blue book (tabien baan), and a signed copy of the owner's ID
If you own the home yourself: your title deed, and your yellow house book (Tor Ror 13) if you have registered for one. The yellow book is optional, so many foreign owners do not have one, in which case the title deed alone is generally what's presented
If the owner is a company: the rental contract, with revenue stamps affixed at the same 0.1% rate, the property's title deed, the house's blue book, the company certificate showing who can act on the company's behalf, and a signed copy of that person's ID
Your children's birth certificates, if you have children together
For some nationalities, a police clearance certificate, which can take around 45 days to obtain, so this needs to be started well ahead of your application
Requirements can vary between immigration offices, so it is always worth confirming the exact list before your appointment, either by contacting your local immigration office directly, or by working with a visa service familiar with your specific office, like ours.
The Witness Requirement Explained
This is the part of the process that surprises most applicants. Because Thai Immigration needs to confirm that a marriage is genuine and not arranged purely for visa purposes, officers in many provinces ask the couple to bring one or more Thai witnesses who can personally vouch for the relationship.
These witnesses do not need to be relatives, though a parent-in-law is common. Neighbors, friends, or even a village head have all been accepted in practice, as long as they hold a valid Thai ID and can genuinely speak to knowing you as a couple. The exact number requested varies by office: some ask for two witnesses, while in Hua Hin, for example, one is generally sufficient. What they are typically asked is straightforward: how long they have known you both, how they know you, and whether they have seen you living together. There is no fixed script, and the tone is generally conversational rather than confrontational.
Where and when this happens varies. Some offices ask for a witness at the initial conversion to Non-Immigrant O status, others reserve it for the annual extension, and some replace the office interview entirely with a home visit, where a neighbor might be asked the same kind of questions on the spot. A number of offices, particularly some in Bangkok, do not require a witness at all. Because of this inconsistency, it is worth identifying someone who could act as a witness well before your appointment, even if you are ultimately not asked.
Timing and Fees
The initial Non-Immigrant O visa costs 2,000 THB, obtained outside Thailand before you travel. Once in Thailand, you convert this to a one year extension of stay at a local immigration office before your initial 90 day period runs out. Each annual renewal after that costs 1,900 THB, paid directly to Thai Immigration.
Re-Entry Permits
Leaving Thailand at any point during your extension, even for a short trip, cancels your permission to stay unless you hold a re-entry permit. The permit itself does not add any extra time to your stay; it simply preserves the extension you already have while you are out of the country.
Two options are available: a single re-entry permit, at 1,000 THB, valid for one trip out and back, and a multiple re-entry permit, at 3,800 THB, valid for as many trips as needed within your current period of stay. If you expect to travel more than three or four times before your next renewal, the multiple permit usually works out cheaper overall.
These permits can be arranged in advance at an immigration office, or at the airport on the day of departure, though airport counters typically charge a higher fee and leave less room for error if something is missing from your file.
Why This Trips People Up
Most problems with the marriage extension come down to two things: paperwork that does not quite match what the specific office expects, and being unprepared for the witness requirement. A foreign marriage certificate that skipped a step in its legalization chain, cohabitation photos that only show the outside of the house, or turning up without knowing who your witness will be if asked, these are the moments that turn a straightforward appointment into a second trip to immigration. This is exactly why we check all of this before you ever set foot in an immigration office, witnesses included.
How We Help
With our Standard service, we come to you, review your documents, and help you complete the required forms, so you know exactly what is missing, and whether a witness is likely to be needed at your specific office, before you submit anything yourself.
With our Premium service, we go further: we assemble your complete file, accompany you to the immigration office, and handle everything through to the final pickup of your passport.
If you are approaching a marriage visa extension in Hua Hin, Cha-am, or Pranburi, contact us for free guidance on your situation before your appointment.