Overstay rules in Thailand: what you should know

What counts as an overstay in Thailand, how fines and re-entry bans work, and the steps to take to avoid overstaying while you are in Chiang Mai.

Published October 17, 2026

What an overstay is

Every time you enter Thailand, or receive an extension, your passport is stamped with a date. That is the last day you are permitted to stay. If you are still in Thailand after that date and have no valid extension, you are in overstay.

It does not matter whether the overstay was deliberate. A misread date, a delayed flight or a forgotten deadline all count.

The consequences

Thai law treats overstay seriously. The consequences depend on how long you overstayed and how it came to light.

Fines

Immigration charges a daily fine, up to a maximum amount. The rates are set by Immigration and may change, so we do not quote numbers here.

Re-entry bans

Longer overstays can result in a ban on returning to Thailand. The length of the ban increases with the length of the overstay. If you are found overstaying by the authorities, rather than reporting it yourself on departure, the consequences are usually more severe.

Future applications

An overstay record stays on your file. It can make later visa or extension applications harder, and Immigration may ask more questions or require more documents.

How to avoid an overstay

Write down your permitted-stay date every time you receive a new stamp.
Act early. For a 30-day visa-exempt extension, apply at least 3 working days before your stay ends. For a DTV extension by mail, start with at least 15 days left.
Know the limits. Visa-free entry is 30 days since 15 September 2026, with one 30-day extension. A DTV allows up to 180 days per entry, with one extension per entry.
Plan travel around renewals. If you hold an extension and need to travel, get a re-entry permit first.

If you are close to your deadline

On visa-free entry: see extending a visa-exempt stay in Chiang Mai.
On a DTV: see DTV extension explained.

If you have already overstayed

We do not accept extension cases where the stay has already expired. The safest step is usually to resolve the overstay with Immigration directly, pay any fine, and get proper advice before you travel. Do not try to hide an overstay; it makes the situation worse.

Get help

Most overstays are avoidable with a simple reminder. Our visa-exempt extension and DTV extension services help you act in time. Message us for a quote.

Questions clients ask us

What counts as an overstay?

Any day you remain in Thailand after the permitted-stay date stamped in your passport, without a valid extension, is an overstay.

Is there a fine?

Yes. Immigration charges a daily fine up to a maximum. The amounts are set by Immigration and can change, so check the current rules.

Can an overstay lead to a ban?

Yes. Longer overstays, or being caught overstaying rather than reporting it yourself, can lead to a ban on re-entering Thailand for a period set by law.

Can NomadNest help if I have already overstayed?

We cannot process extensions for stays that have already expired. Talk to us so we can explain your options, and in most cases you should resolve the overstay with Immigration directly.

DTV Extension by Mail
Extend your DTV stay by up to 180 days without visiting an office. Post your passport to our Chiang Mai office; we return it in about 7 working days.
Visa-Exempt Stay Extension (30 Days)
Entered Thailand visa-free? Extend your stay by 30 days at Chiang Mai Immigration. We prepare forms, photos and TM30, done the same or next day.