The general shape
Thai immigration thinks in terms of a principal and dependants. The workhorse instrument is the Non-Immigrant O dependant visa, available to the spouse and children under 20 of a foreigner holding qualifying long-stay status. It is typically issued as a 90-day entry from an embassy, then extended annually in Thailand alongside the principal's own extension. It does not carry work rights. From there, the details depend entirely on which visa the principal holds.
Family by route
| Principal's route | How the family comes | The practical notes |
|---|---|---|
| LTR visa | Dependant LTR visas: same 10-year term, one file | The strongest family package. The former four-dependant cap has been removed; spouses can access digital work permits; the 2026 revisions extend eligibility toward parents |
| Thailand Privilege | Family members join as supplementary members on Platinum tier and above | Simple and paperwork-free, priced per person; children's memberships run on the same clock as the principal's |
| Non-Immigrant B (work) | Spouse and children under 20 on Non-O dependant visas | Extensions ride on the employee's file; income evidence of roughly ฿40,000 a month supports a family extension smoothly |
| Retirement (Non-O / O-A) | Spouse extends as a dependant of the retiree; children are rare on this route | An under-50 spouse can extend as a dependant without meeting the age test; each adult still needs their own financial footing at some offices, so plan the funds evidence |
| Married to a Thai national | The Thai-marriage extension | ฿400,000 seasoned in a Thai bank or ฿40,000 monthly income; carries the possibility of a work permit, unlike the routes above |
Children and schools
A child on a dependant visa may attend Thai or international school without further status. The education visa, the Non-ED, exists for the reverse situation: a child studying here whose parents do not hold Thai status. Families occasionally use a child's ED visa as the household anchor; we advise against it where any better route exists, because it inverts the dependency, ends with the enrolment, and gives the parents guardian status rather than standing of their own.
School admissions run on their own calendar, not immigration's. The international schools that matter interview months ahead of entry, and proof of visa status is a standard enrolment document. We sequence the two workstreams together: school offer and visa file, so neither waits on the other in the wrong month.
The issues families actually hit
- Documents from home: marriage and birth certificates must be legalised and translated, and the chain of certification takes weeks. Start it first; it delays more families than any Thai requirement.
- The 20th birthday: dependant status for children ends at 20. A child approaching the line needs their own route, usually education, planned a year ahead.
- A spouse who wants to work: Non-O dependant status does not permit it. The clean answers are an LTR spouse's digital work permit, the spouse's own Non-B, or the Thai-marriage route where it applies.
- Mixed files: households where the principal upgrades, to LTR or Privilege, without moving the dependants, leaving the family on mismatched clocks. Renew the household as one file, on one calendar.
- 90-day reporting and re-entry permits apply to every family member individually on most routes; missed reports by a dependant carry the same fines as by a principal.
How we plan a family move
In order: settle the principal's route on its own merits, because everything hangs from it. Model the household on each candidate route, including school years, a spouse's work intentions and any parents joining later. Start the document legalisation immediately. Then file the family together, once, with the extensions synchronised so that every future renewal is a single annual event rather than a scattered season of them. Done this way, the family's immigration life takes one morning a year.
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This briefing is general information, not legal, tax or investment advice. Thai rules change frequently and individual cases differ. Verify current requirements with the relevant authorities, including the Immigration Bureau, the Board of Investment, the Land Department, the Department of Business Development and the Revenue Department, and take advice on your own facts before acting.
Where a conversation helps.
Briefings generalise; your situation will not. We work with a limited number of private partners, and if any of the above touches a decision you are actually making, we would be glad to consider it with you, privately and without obligation.
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