What is the difference between a visa and a permission of stay?
The visa is the document issued by an embassy abroad or by Immigration in Thailand, and it carries a validity period. The permission of stay, or stay permit, is how long you may actually remain inside Thailand on one entry. They are set separately and rarely align.
This applies to almost every long-stay visa Thailand offers, and it is the single most misunderstood part of the system.
Most people do not discover it until they see it play out in their own passport at the immigration desk.
Why does a 5-year DTV only stamp you in for 179 days?
The Destination Thailand Visa is valid five years, but Immigration stamps DTV holders in for a maximum of about six months per entry. Arrive in August 2026 on a visa issued that July and you are stamped to roughly mid-February 2027 — 179 days, not five years.
To stay longer on that entry you have two options. You can extend your permission of stay at an Immigration office before it runs out, which if granted buys another 179 days. Or you can leave and re-enter, which usually earns a fresh 179 days.
Both are discretionary. The officer in front of you can grant it in full, grant a shorter period, or refuse. Immigration is reasonable in the vast majority of cases where your situation matches what the visa was designed for — but it is not guaranteed.
How does this work on a 10-year LTR visa?
The LTR is issued as a 10-year visa, but your initial permission of stay is five years. Within that window, leaving and re-entering does not reset the clock — you are stamped back in until your original stay permit's end date, or your passport expiry, whichever is first.
An LTR issued in Bangkok on 26 May 2026 shows a visa expiry of 25 May 2036 in your passport. Your stay permit, however, runs to 25 May 2031.
Leave and re-enter at any point in those five years, as essentially everyone does, and you are stamped back in to 25 May 2031. Not a fresh five years.
Which visas do line up cleanly?
A few do. The Non-Immigrant O retirement visa is the clearest example, because it is issued as a 90-day visa and then extended in 12-month increments inside Thailand — the extension effectively is the permission of stay. The Non-Immigrant Business visa works the same way.
Both are older, well-understood legacy programmes that every Thai immigration office knows deeply. That is an underrated benefit of established pathways.
For most other long-stay visas, the mismatch is the norm rather than the exception. It is not a bad thing — it is just something to pay attention to.
Why does this distinction actually matter?
Two reasons: overstay risk and entry risk. If you assume your visa validity is your permission of stay and do not check your entry stamps, you can overstay without realising. Overstays bring daily fines and, depending on length, formal blacklisting from Thailand for years.
The second reason is entry itself. Holding a valid Thai visa does not guarantee you the right to enter, even inside the validity period. Officers have discretion on initial entry, on re-entry, and on extensions.
In practice Immigration is reasonable. If your situation is consistent with your visa and you are doing what the visa was designed for, you will rarely have serious problems beyond the occasional inconsistency.