Guardian & Dependent Visas in Thailand 2026 — Complete Non-O Family Guide

Guardian visa vs dependent visa — the practical difference

Both sit under the Non-Immigrant O category, but they rest on different qualifying facts. The guardian route rests on the child's student status: a Ministry of Education-licensed school issues a letter naming the parent or guardian who is applying. The dependent route rests on the principal family member's own status — a husband holding a Non-B with a valid work permit, or a wife on a retirement extension.

That difference drives the paperwork. Guardians resubmit school documents every year: enrolment confirmation, tuition receipts, and attendance or academic records. Dependents resubmit the principal applicant's documents: current visa and work-permit pages, company certification, and tax evidence.

The most misunderstood point is the end date. A dependent's or guardian's permission never runs past the principal applicant's permitted stay or the academic year it is tied to. If the principal's extension is shortened or cancelled, the family members are affected on the same day.

• Guardian: tied to the school and the child's Non-ED visa
• Dependent: tied to the principal family member's visa and extension
• Permitted stay never exceeds the principal's end date or the academic year

Who qualifies as a guardian

The core case is a legal parent of a student holding a Non-ED visa at a properly licensed institution. In practice Immigration assesses the genuine need for supervision based on the child's age, so parents of younger children are approved far more straightforwardly than parents of students approaching adulthood.

Legal guardians who are not parents — grandparents or an appointed guardian — must produce a court order or a properly legalised instrument granting custody, not a simple consent letter. This is one of the most common causes of rejection.

Where the parents are separated or divorced, expect to add the divorce judgment or custody agreement to prove that the applicant genuinely holds care of the child.

Relationship documents: certification, translation, legalisation

Foreign civil documents cannot be used in Thailand as issued. They must be authenticated in the country of origin, translated into Thai (or English, then Thai where required), and legalised by the Department of Consular Affairs of the Thai Ministry of Foreign Affairs.

Thailand's accession to the Hague Apostille Convention takes effect on 28 February 2027, after which documents from member states can travel on an Apostille rather than the embassy legalisation chain. The certified Thai translation requirement remains in place for most Thai authorities.

Prepare at least two complete sets. The same documents are typically needed at the Thai mission abroad, at the Immigration office for the extension, and for the school's own student file.

• Child's birth certificate naming both parents
• Parents' marriage certificate, or divorce and custody documents
• Court order or legalised custody instrument for non-parent guardians
• Certified Thai translation plus MFA legalisation

School documents to request every year

International schools with large foreign cohorts in Phuket, Bangkok and Chiang Mai usually issue this bundle as a standard registrar service, but request it two to three weeks before the Immigration appointment because each letter must be signed by an authorised officer and sealed.

Watch the issue date: many Immigration offices require the letter to be dated within 30 days of filing, so requesting it too early means requesting it again.

• Enrolment confirmation naming the applying guardian
• Cover letter addressed to the Immigration office
• Tuition receipt for the current term
• School licence and signatory authority documents
• Attendance or academic record for second-year renewals onward

Financial and address evidence

Unlike the retirement and marriage routes, there is no nationally published figure. Each Immigration office exercises discretion over whether the applicant can support the stay and the child. In practice most applicants present a Thai bank account with a bank letter and a passbook updated on the day of filing.

Address evidence must be internally consistent: lease or title deed, a map, photographs showing the house number, and a TM30 address notification already filed by the house master or landlord. A single mismatch usually means the file is returned for correction before it is assessed.

Because fees and local practice change, confirm the current requirements with our team by phone, LINE or email before assembling the file.

Filing sequence, from abroad to annual extension

The smoothest path is to obtain the Non-Immigrant O through Thai e-Visa before travelling, which gives an initial 90-day permitted stay to prepare the extension. Changing visa category inside Thailand is possible in some cases, but requires enough days remaining under the applicable rules and is discretionary.

Once in Thailand, file form TM7 for a one-year extension of stay at the Immigration office covering the actual residence, roughly 30 to 45 days before expiry. Many offices issue a 30-day consideration stamp before granting the full year.

Obtain a re-entry permit before every departure. Leaving without one cancels the extension the moment you exit — by far the most common mistake among families travelling during school holidays.

• Non-O via e-Visa abroad, or an in-country change of category where eligible
• TM7 one-year extension filed 30–45 days early
• 90-day reporting (TM47) online or in person
• Re-entry permit before every departure

Work rights and structural limits

Neither the guardian nor the dependent visa grants work rights. Any work requires a work permit issued by the Department of Employment, and remote work paid from abroad still falls within the scope Thai authorities assess. Families who need to work should look at a Non-B with a work permit or the DTV for remote workers.

The qualifying fact can also disappear: a school transfer or the child's graduation ends the basis for the permission. The guardian must switch to another basis or depart before the permitted stay ends, because even a short overstay affects the next application.

Why files get rejected — and how to prevent it

From the family files we handle in Phuket, most problems are not about eligibility. They are document details that are entirely fixable with lead time.

• Birth certificate translated by an uncertified translator, or missing MFA legalisation
• Name spellings differing across passport, birth certificate and school records
• School letter dated more than 30 days before filing
• No TM30, or a TM30 address that does not match the TM7
• Re-entry permit forgotten before a school-holiday trip
• Bank balance dropping after filing, triggering additional document requests