Almost everyone who spends real time in Thailand eventually runs into the same wall: your permitted stay is shorter than the life you’re building here. Whether you’re a tourist who’s fallen in love with the place, a retiree renewing for the tenth year running, or someone juggling a work visa and a growing family, understanding how extensions actually work — and the ongoing obligations that come after you get one — is one of the most practically important things to get right in Thailand.

This guide covers every part of it: extending a tourist stay, renewing every category of non-immigrant visa, 90-day reporting, re-entry permits, TM30 address notification, what happens if you overstay, and the mistakes that trip people up most often.

1. Understanding the two-part system: visa vs permitted stay

Before any of the specifics make sense, it helps to separate two things that people often treat as one: your visa and your permitted stay.

Your visa is the category you were granted — tourist, non-immigrant B, O, O-A, ED, and so on. Your permitted stay is the specific number of days you’re allowed to remain in Thailand on that entry, stamped in your passport on arrival. An “extension” doesn’t change your visa category; it extends your permitted stay within (or sometimes beyond) what that visa type allows. A “renewal” of a non-immigrant visa is really a repeated annual extension of stay, applied for at a Thai immigration office, based on continuing to meet that visa category’s requirements (retirement, marriage, employment, study, etc).

Keeping this distinction in mind makes the rest of this guide much easier to follow, since almost every extension process in Thailand is really answering the same underlying question: does this person still qualify for the reason they were allowed to stay in the first place?

2. Extending a visa-exempt entry

If you entered Thailand without a visa under a visa-exemption arrangement, you can generally extend that stay once, for an additional 30 days, at any Thai immigration office, for a fee of 1,900 THB. This is a one-time extension per entry — it can’t be extended a second time in the same trip.

3. Extending a Tourist Visa (TR)

If you entered on a Tourist Visa (TR) — typically granting 60 days on a single-entry basis — you can extend once, for an additional 30 days, giving a maximum combined stay of 90 days. Same fee (1,900 THB), same one-time limit, same process: visit any Thai immigration office, submit a TM.7 form with your passport, a passport photo, and the fee.

Beyond that 90-day ceiling, your remaining options are the same as for a visa-exempt entry: leave Thailand, do a border run to reset on a fresh entry, or apply for a proper long-stay Non-Immigrant visa from a Thai embassy or consulate, ideally before your current stay runs out.

4. Renewing non-immigrant visas: the general pattern

Every non-immigrant category — retirement, marriage, business, education, LTR — follows a broadly similar rhythm, even though the specific requirements differ:

• Your initial visa (often 90 days) is used to enter Thailand and get established
• You then apply for a one-year extension of stay at a Thai immigration office inside the country, based on the underlying purpose of your visa
• That extension is renewed annually, indefinitely, as long as you continue to meet the category’s specific requirements
• The standard extension fee across most categories is 1,900 THB, though documentation requirements vary significantly by category

The key thing to understand: an annual renewal isn’t a formality. Immigration re-checks the underlying qualifying condition every time — your bank balance, your marriage, your job, your enrolment — not just your paperwork from a year ago.

5. Retirement visa renewals

For O-A and O retirement extensions, each annual renewal requires you to re-demonstrate:

• The financial requirement — 800,000 THB in a Thai bank account (seasoned for at least 3 months before the renewal date) or a certified monthly income of at least 65,000 THB
• Valid health insurance meeting the minimum coverage thresholds (40,000 THB outpatient / 400,000 THB inpatient)
• Continued compliance with 90-day reporting throughout the previous year

6. Marriage visa renewals

Non-O marriage visa renewals require re-confirming:

• 400,000 THB in a Thai bank account, seasoned for at least 3 months before each renewal (or certified monthly income of at least 40,000 THB)
• That the marriage remains valid and, in practice, that the relationship is genuine — immigration officers have discretion to request evidence of a shared household, photos, or an interview, particularly if anything about the application looks inconsistent

7. Business/work visa renewals

Non-B extensions are tied directly to your employer and your work permit, so renewal requires:

• A currently valid work permit, matched to the same employer, role, and location as your visa
• Your employer’s continued good standing — updated company registration, tax filings, and the required Thai-to-foreign staff ratio
• If you’ve changed jobs during the year, a fresh visa and work permit application, not a simple renewal of the old one

8. Education visa renewals

ED visa extensions are tied to continued enrolment at an approved institution, and typically require:

• A current letter of enrolment or continuation confirming you remain an active student
• Evidence of adequate attendance — institutions increasingly report attendance data to immigration, and poor attendance can jeopardise renewal

9. LTR visa renewals

The Long-Term Resident visa works differently — it’s granted for an initial 5-year period and can be renewed once for a further 5 years, giving up to 10 years total, rather than requiring the annual renewal cycle that other categories need. At the 5-year renewal point, the Board of Investment reassesses your eligibility from scratch against the category’s current criteria, so it’s not automatic — but it’s a dramatically lighter ongoing burden than an annual extension.

10. The 90-day reporting requirement

Separately from any visa extension, anyone who has stayed in Thailand continuously for more than 90 days — regardless of visa type, including retirement, marriage, work, education, and even Thailand Privilege membership — must notify immigration of their current address. This is an address check, not a renewal, and it doesn’t extend or affect your visa’s validity.

• Can be filed in person at your local immigration office, by registered mail, or online (availability varies by office)
• Can be submitted from 15 days before the deadline up to 7 days after, without penalty
• Missing the window results in a fine, typically at least 2,000 THB, paid on the spot when you eventually file
• Leaving and re-entering Thailand during the 90-day period generally resets the clock, since a fresh entry stamp starts a new 90-day count

11. Re-entry permits

This is one of the most consequential things people overlook. Leaving Thailand while holding a valid extension of stay without a re-entry permit voids that extension the moment you exit — even if the expiry date printed in your passport hasn’t been reached yet. You’d need to re-enter on a fresh basis, which for many visa categories means starting the process over almost entirely.

• Single re-entry permit — covers one trip out and back, typically around 1,000 THB
• Multiple re-entry permit — covers unlimited trips out and back for the remaining validity of your current extension, typically around 3,800 THB, and is usually the better value if you expect to travel more than twice

Apply for a re-entry permit at any Thai immigration office, or at the airport immigration counter, before you depart — not after you’ve already left.

12. TM30: address notification

Separate again from 90-day reporting, a TM30 form notifies immigration of where you’re staying whenever you move address, or when you first arrive at a new accommodation. Legally, this is the responsibility of your landlord or hotel, not you personally — but in practice, it’s very much your problem if it hasn’t been filed, because a missing TM30 can hold up an extension application, a bank account opening, or a 90-day report.

13. What happens if you overstay

Overstaying, even briefly, is treated seriously and consistently by Thai immigration:

14. Border runs: what they are and their risks

A “border run” — leaving Thailand briefly and re-entering to reset a visa-exempt or tourist stay — has long been an informal workaround for people who want to stay longer without a formal long-stay visa. It’s not illegal in itself, but it comes with real risks in the current environment:

• Immigration officers have discretion to question or refuse entry to travellers whose passports show a long, repeated pattern of short entries with no clear underlying purpose
• Enforcement around this has tightened in 2026, alongside broader changes to visa-exempt policy, making a heavy reliance on border runs a genuinely less reliable long-term strategy than it may have been previously
• For anyone planning to stay in Thailand for years rather than weeks, applying for the correct long-stay visa category is a far more stable foundation than repeat border runs

15. Documents to always have ready

Regardless of which extension or renewal you’re doing, immigration offices process a high volume of applications daily and have little flexibility for missing paperwork. A well-prepared folder typically includes:

• Original passport, valid well beyond your intended new stay period
• Photocopies of your passport bio-data page and your most recent entry stamp
• A recent passport-style photo
• The relevant TM form (TM.7 for extensions, TM47 for 90-day reports)
• A TM30 receipt confirming your current address
• The correct fee, in cash — most immigration offices don’t accept cards
• Category-specific documents (bank statements, marriage certificate, work permit, enrolment letter, insurance certificate) matched to your visa type

16. A practical renewal calendar

A simple way to stay ahead of all of this without relying on memory:

• Every 90 days: file your address report (within the 15-days-before to 7-days-after window)
• 30 days before your extension expires: start gathering renewal documents; most extensions can be applied for up to 30 days in advance, and doing so early avoids last-minute queue pressure
• Before any international trip: apply for a re-entry permit if you hold a non-immigrant extension of stay
• Whenever you move address: confirm your TM30 has been filed, don’t assume it happened automatically

17. Common mistakes

• Leaving on a trip without a re-entry permit, voiding an otherwise-valid extension of stay the moment you exit.
• Letting a bank balance dip below the required minimum at any point during the year, not realising renewals look at the full period, not just the application date.
• Assuming a missed 90-day report is harmless because it doesn’t cancel the visa — it still creates a compliance record that can affect future applications.
• Relying on repeated border runs indefinitely rather than transitioning to a proper long-stay visa once it’s clear you’re staying long-term.
• Applying for a renewal too late, especially for categories (retirement, education) where processing can take up to 30 days.
• Assuming a landlord has filed the TM30 without checking, then being turned away at an immigration office over missing paperwork that wasn’t even your responsibility to file.

18. Frequently asked questions

19. Practical tips

• Set calendar reminders well ahead of every deadline — 90-day reports, annual renewals, and re-entry permits before any trip — rather than relying on memory once life gets busy.
• Keep a dedicated folder, physical or digital, with your core documents ready to go: passport copies, TM30 receipt, bank statements, insurance certificate.
• Never travel internationally on a non-immigrant extension without checking your re-entry permit status first — this is one of the most common and most costly mistakes.
• If in doubt about a missed deadline, go to immigration and ask, rather than waiting — small compliance issues handled promptly rarely escalate; ignored ones usually do.
• Build in buffer time before every renewal deadline, particularly for categories with longer processing times, so a busy immigration office or a missing document doesn’t turn into a crisis.