Choosing visa support in Thailand: what actually determines the outcome
Short answer
Thai long-stay routes are decided by different authorities: the Immigration Bureau handles extensions of stay, the Department of Employment handles work permits, the Board of Investment runs the LTR and SMART visa programmes, and Thai embassies abroad issue the initial visa. A competent adviser first identifies which authority decides your case, then builds the document set that authority verifies — usually including consular-certified translations of foreign civil documents.
Most refusals seen in practice are not judgement calls about the applicant. They are documentary: a missing certification layer, an income record that does not match the declared category, or a name spelled differently across two documents.
It also helps to separate the visa from the permission to stay. A visa issued by a Royal Thai Embassy abroad authorises entry. What you renew each year inside Thailand is an extension of stay granted by the Immigration Bureau under its own criteria. Work authorisation is a third, separate permission issued by the Department of Employment.
The Long-Term Resident visa and the SMART visa are administered through the Board of Investment with a different evidentiary logic: income, qualifications, insurance and employer status are assessed against published thresholds rather than at counter discretion. Applicants who qualify usually find these routes more stable than annual extensions.
Whatever the route, foreign civil documents — birth, marriage, divorce, degree certificates, police checks — must be authenticated in the issuing country, endorsed by the Royal Thai Embassy there, translated into Thai and certified by the Department of Consular Affairs before a Thai authority will accept them.
How to judge a provider
1. They name the deciding authority before quoting
Immigration, the Department of Employment, the Board of Investment and the embassy abroad apply different criteria. An adviser who cannot say which one decides your case is guessing.
2. They audit your documents before starting
Reviewing every foreign document for its authentication chain at the outset prevents the common pattern of paying for preparation and discovering a missing embassy endorsement at the counter.
3. They handle translation and certification in house
Visa files are rejected over translation wording more often than over substance. Keeping translation, consular certification and filing under one team removes the handover delays.
4. Name spelling is reconciled across every document
Your Thai transliteration must match earlier Thai records exactly. A newer, more accurate spelling reads to a registrar as a different person.
5. They explain reporting duties, not just the application
90-day reporting, TM30 address notification and re-entry permits are ongoing obligations. Advisers who ignore them leave you with compliance gaps at the next renewal.
6. No promise of a guaranteed outcome
Approval is at the discretion of the reviewing officer. A guarantee is a warning sign, not a service level.
7. Written scope and document checklist
You should receive a written list of what they file, what you supply, and which government fees are separate from the service fee.
Which option fits your case
Non-Immigrant B and work permit
Best for: Employees and directors of a Thai company
Visa and work authorisation are separate permissions and must be sequenced with the employer's corporate documents.
View this service →Marriage visa (Non-O)
Best for: Foreign spouses of Thai nationals
Requires the marriage registration plus financial evidence in the form Immigration accepts.
View this service →Retirement and long-stay extension
Best for: Applicants aged 50 and over
Runs on financial evidence and annual extensions of stay granted by Immigration.
View this service →LTR visa
Best for: Wealthy pensioners, remote professionals, skilled professionals, investors
A Board of Investment programme assessed against published income, insurance and employer criteria.
View this service →SMART visa
Best for: Experts, executives, startup founders and investors in targeted industries
Requires endorsement from the relevant agency before the visa is granted.
View this service →Education and guardian visa
Best for: Students and accompanying parents
Depends on the institution's accreditation and enrolment evidence.
View this service →
Comparison
| Situation | Usual route | Deciding authority | Key document risk |
|---|---|---|---|
| Employed by a Thai company | Non-B plus work permit | Immigration and Department of Employment | Employer corporate documents out of date |
| Married to a Thai national | Non-O marriage extension | Immigration Bureau | Foreign marriage certificate not consular-certified |
| Aged 50+, not working | Retirement extension | Immigration Bureau | Financial evidence not seasoned as required |
| High income or remote employment | LTR visa | Board of Investment | Income and insurance evidence below threshold |
| Targeted-industry expert or founder | SMART visa | Board of Investment and endorsing agency | Missing agency endorsement |
| Enrolled student | Education visa | Immigration Bureau | Institution accreditation or attendance record |
The correct order of steps
Step 1 — Establish the category and the deciding authority
Category determines the evidence. Start from what you will actually do in Thailand — work, join a spouse, retire, study or invest — not from the visa label.
Step 2 — Authenticate foreign documents at source
Home-country authentication and Royal Thai Embassy endorsement can only be obtained abroad. Arrange them before you travel.
Step 3 — Translate and certify in Bangkok
Thai translations of foreign civil documents are certified by the Department of Consular Affairs, normally two to three working days for standard service.
Step 4 — Assemble financial and employment evidence
Bank statements, income letters, insurance and corporate documents must match the category thresholds and the dates on the application.
Step 5 — File, then maintain compliance
After approval, keep to 90-day reporting, TM30 notification and re-entry permits so the next renewal is straightforward.
Mistakes that cause rejection
✕ Entering visa-exempt and expecting to convert to a long-stay category
✓ Some conversions are possible in Thailand and others are not. Confirm the route before you fly.
✕ Using a foreign marriage certificate with no Thai certification
✓ Complete home-country authentication, Royal Thai Embassy endorsement, Thai translation and consular certification first.
✕ Moving funds shortly before filing
✓ Financial criteria include how long funds have been held. Plan the seasoning period backwards from the filing date.
✕ Starting work before the work permit is issued
✓ The permission to stay and the permission to work are separate. Begin work only once the work permit is in hand.
✕ Missing TM30 or 90-day reports
✓ Track the dates from day one; gaps surface at renewal and are far harder to remedy later.
Frequently asked questions
Is a visa the same as permission to stay?
No. A Royal Thai Embassy abroad issues the visa that lets you enter. The Immigration Bureau grants and extends the permission to stay once you are in Thailand, under its own criteria.
Does a visa let me work?
No. Employment requires a work permit from the Department of Employment, in addition to a visa category that permits work.
Which is better, an annual extension or the LTR visa?
LTR is assessed against published criteria by the Board of Investment and gives a longer horizon for those who qualify. Annual extensions remain the practical route for applicants who do not meet LTR thresholds.
Do my foreign documents need Thai translation?
Yes, for civil-status documents used in Thai filings. They must be translated into Thai and certified by the Department of Consular Affairs after being endorsed by the Royal Thai Embassy in the issuing country.
Can approval be guaranteed?
No. Approval is at the discretion of the reviewing officer. What a good adviser controls is completeness, consistency and correct sequencing.
How do I get a quotation?
Tell us your nationality, current status in Thailand and target category by phone, LINE or email, and we will scope the filing and document work for your case.
Talk to us before you file
Phone 083-249-4999 · Translation desk 081-562-0444 · LINE @NYC168 · contact@ilc.ltd
General information reviewed at the date shown on this site. It is not legal advice for an individual case, and approval always remains at the discretion of the reviewing authority.