1"Renewal" vs "extension of stay"

The wording matters. Your visa is the sticker an embassy issued that let you enter Thailand. Once you're inside, what you keep renewing is your permission to stay — the "permitted to stay until" stamp in your passport. You do this with an extension of stay, not by getting a fresh visa abroad.

This is the whole reason border runs are unnecessary. Instead of flying out to reset your entry, you walk into your local Immigration office, file a TM.7, and receive a new stamp — extending your legal stay by up to a year at a time, indefinitely, as long as you keep qualifying.

2Which visas can be extended in-country

If you're on a tourist or exempt entry but want to stay long term, you don't necessarily have to leave — you may be able to convert to a Non-O in-country (see §7).

3The TM.7 form, the fee and where to go

• Form: TM.7 (Application for Extension of Temporary Stay) — free to download from immigration.go.th or collected at the office.

• Fee: a flat 1,900 THB, the same whether the extension is for 30 days or a full year.

• Where: the Immigration office covering your registered address — Chaeng Wattana (Bangkok), Jomtien (Pattaya), Phuket, Chiang Mai or your provincial office.

• When: before your permitted stay expires — apply early, ideally within the final 15–30 days depending on category. Never let it lapse.

4Extending a retirement stay

The most common long-stay extension. To extend based on retirement you must be 50 or older and meet one of these financial tests:

• 800,000 THB in a Thai bank account, deposited at least 2 months before applying and kept for 3 months after approval; thereafter you must maintain at least 400,000 THB year-round.

• Or a monthly income of 65,000 THB.

• Or a combination of savings and annual income totalling 800,000 THB.

O-A holders also need qualifying health insurance. Once granted, the extension is renewable indefinitely each year as long as you still qualify.

5Extending a marriage stay

For those married to a Thai national. The financial bar is lower than retirement, but the relationship evidence is stricter:

• 400,000 THB in a Thai bank account, or a monthly income of 40,000 THB.

• Marriage certificate, proof of a genuine relationship (photos together, shared home), and your Thai spouse present at the appointment.

• Immigration may conduct a home visit and often processes it in stages — a short "under review" extension first, then the full year once approved.

A marriage extension also lets you apply for a work permit to work legally.

6Work, business and education

Business/work (Non-B): the TM.7 extension renews your stay and your work authorisation together, backed by your employer's sponsorship, company financials, the Thai-employee ratio and the work permit. Plan the visa extension and work-permit renewal as one exercise.

Education (Non-ED): extensions are typically granted in stages with a letter confirming your continued enrolment and attendance at a recognised school or university.

7Converting a tourist entry — without flying home

Here's the part many people miss. If you arrived on a tourist visa or visa-exempt stamp but qualify for retirement or marriage, you usually don't have to leave to get the right visa. You can convert in-country:

• Apply at Immigration to change your visa type to a 90-day Non-Immigrant O (form TM.87 for visa-exempt entrants, TM.86 if you hold a visa).

• Then, before those 90 days end, file the TM.7 one-year extension based on retirement or marriage.

8The extension process, step by step

1. Prepare your documents — passport (6+ months validity), completed TM.7, a recent 4×6cm photo, copies of your passport pages, your TM.30 address receipt and your category's financial proof.

2. Go to the right office for your registered address and take a queue number.

3. Submit to the officer, who reviews everything and may ask about your stay.

4. Pay the 1,900 THB fee and receive a receipt.

5. Get your result — either a same-day stamp, or an "under consideration" slip (around 30 days) for retirement/marriage, after which you collect the final stamp.

6. Check the stamp — verify the new "permitted to stay until" date before you leave the counter.

9The re-entry permit — protect your extension

This is the single biggest trap. An extension of stay is tied to your current entry. If you leave Thailand without a re-entry permit, your extension is instantly void — even if months remain — and you'd have to start over.

• Get a re-entry permit (form TM.8) before you depart — at Immigration or at the airport.

• 1,000 THB for single re-entry, 3,800 THB for multiple.

• You don't need one if you hold a multiple-entry visa, or if you never leave during the extension period.

10After you extend: staying compliant

• 90-day reporting (TM.47) — notify your address every 90 continuous days; the clock restarts from your extension approval or each re-entry.

• TM.30 — your landlord or host must have your address on file; you'll often need the receipt at extension time.

• Keep qualifying — maintain your bank balance, income or employment so next year's extension is straightforward.

• Diarise the date — set a reminder a month before your "permitted to stay until" date.

11Common mistakes and overstay penalties

• Leaving mid-application — voids your extension or conversion instantly.

• Travelling after extending without a re-entry permit — cancels the whole extension.

• Missing the deadline — overstay is fined 500 THB per day, up to 20,000 THB, with blacklist risk for long overstays.

• Wrong office — you must apply where your address is registered.

• No valid TM.30 on file — a frequent cause of last-minute rejection.