How Thailand counts your days
Thailand does not use a rolling window like Schengen. Each entry carries its own allowance, stamped in your passport as an "admitted until" date, and that clock resets completely when you leave and return. The day you arrive and the day you depart both count as full days of the permitted stay.
From 15 September 2026 the visa exemption stamp is 30 days, down from the 60 days that had applied since mid-2024. The announcements published in the Royal Gazette on 31 August 2026 put around 60 countries and territories on the 30-day exemption, including the US, UK, Canada and Australia; two nationalities receive 15 days, and three move to visa on arrival. Anyone admitted before 15 September keeps the period stamped on entry, so 60-day stamps are still running into November.
A 30-day extension is generally available once per entry from an immigration office, which takes a 30-day exemption to 60. A 60-day tourist visa plus that extension still reaches 90. Because the eligible-country list and the durations change, this calculator lets you set the allowance rather than assuming one — set it to what your passport actually received.
The number nobody tracks
Visa days are the obvious thing to count. The number that catches long-stay visitors out is the 180-day tax residency threshold.
Spend more than 180 days in Thailand in a calendar year and you are a Thai tax resident. The wording matters: 180 days exactly is still outside, and day 181 is inside. Since 2024 this matters far more than it used to: foreign income remitted into Thailand by a tax resident is assessable for Thai income tax. Someone doing six 30-day exemption stays across a year — entirely lawful, never close to an overstay — lands on exactly 180 days and stays outside the threshold by a single day. One more day anywhere in that year, on any entry, and they are a Thai tax resident without ever having been near an immigration problem.
That is why this tool shows both counters side by side. They are different thresholds, measured over different things, and staying inside one tells you nothing about the other.
Visa runs and immigration discretion
A visa run means leaving Thailand and coming straight back for a fresh stamp. It works mechanically, and there is no published rolling-window limit for arrivals by air. But two things are worth understanding honestly:
- Entry is always discretionary. An immigration officer can refuse entry to a visa-exempt traveller without giving detailed reasons. A passport full of consecutive exemption stamps with two-day gaps is the pattern that prompts questions about whether you are effectively living in Thailand.
- Land borders are treated differently, and now explicitly so. Under the rules in force from 15 September 2026 the 30-day exemption may be used at a land checkpoint no more than twice per calendar year, except for nationals of Malaysia, Brunei, Indonesia and Singapore. Air arrivals are not subject to that cap. If your plan involves repeated land crossings, this is now a hard limit rather than a matter of discretion.
If you genuinely intend to spend most of the year in Thailand, the appropriate answer is a visa that permits it — a long-stay, education, retirement or destination-style visa — rather than a chain of exemption stamps. Repeated visa runs are a lawful pattern that immigration is entitled to look through.
Overstaying
Thailand publishes and enforces its overstay penalties consistently. Overstays incur a daily fine up to a capped amount, payable on departure. Longer overstays add re-entry bans, which escalate with the length of the overstay and are considerably more severe if you are arrested rather than presenting yourself voluntarily at departure. Unlike some countries, this is not an area where enforcement is patchy.
The practical implication is simple: know your "admitted until" date. This calculator computes it for each entry, and flags any logged stay that runs past it.
If you want to stay longer
Chaining exemption stamps is the wrong tool for a long stay. Thailand has several routes that permit one properly, and using the right one removes both the border-discretion risk and the need to leave every two months:
- Destination Thailand Visa (DTV). A multi-entry visa aimed at remote workers and people coming for Thai cultural activities, valid five years with stays of up to 180 days per entry, extendable once. It has financial requirements and is applied for from outside Thailand.
- Education visa (ED). Tied to enrolment at an approved institution, commonly Thai language schools. Attendance is genuinely checked.
- Retirement visa (O-A or O-X). For applicants over 50 meeting income or bank balance requirements, renewable annually.
- Thailand Privilege. A paid membership programme granting long-term entry, priced accordingly.
Reporting obligations while you are there
Two requirements catch out people staying beyond a short holiday, and neither has anything to do with your entry stamp:
90-day reporting. If you remain in Thailand for 90 consecutive days on a long-stay visa, you must notify immigration of your address, and again every 90 days after that. Leaving the country resets the clock. It is a notification, not permission, but failing to file attracts a fine.
TM30. The owner of the property you stay in is responsible for notifying immigration of your presence within 24 hours of arrival. Hotels do this automatically. If you rent a condo or stay with friends, it may not happen, and the gap tends to surface later when you go to extend a stay or file a 90-day report. Enforcement varies considerably by province.
Common mistakes
- Assuming the allowance is still 60 days. It dropped to 30 for most nationalities on 15 September 2026, and a plan built on the old 60-day stamp runs into an overstay a month early.
- Counting from the day after arrival. The arrival day is day one.
- Treating the extension as automatic. It requires a visit to an immigration office, a fee and paperwork, and it is granted at their discretion.
- Ignoring the calendar-year tax count. It resets on 1 January regardless of your visa position, and it does not care how many separate entries the days came from.
Other counters
If Thailand is one stop among several, the tax residency day tracker checks one trip log against thresholds in more than twenty countries at once. For Japan's 90-day visa-free rule see the Japan 90-day calculator, and for Europe the Schengen 90/180 calculator.