Non-B Visa Thailand: Read Your Own Work Permit

Your first week at a Thai school, someone from the office asks for your passport. It comes back days later with a new page marked up, fresh stamps, and a slip stapled near the back. “All done,” they say. “Don’t lose it.”

That’s how most teachers get a Non-B visa and work permit in Thailand. The school handles it, you sign where the pen points, and the whole stack goes into a drawer. Then eleven months later an officer turns to a page you’ve never looked at and asks a question you can’t answer — or your school’s admin gets one date wrong and nobody notices until it’s the kind of problem that eats a weekend.

You don’t need to become an immigration expert to close that gap. You need to read about fifteen Thai words and one calendar.

Every Date Is 543 Years Ahead

Start here, because it costs ten seconds and prevents the most common misread.

Thai official documents run on the Buddhist Era — พุทธศักราช(phút-thá-sàk-gà-ràat), abbreviated พ.ศ.(phaw sǎw) and read aloud as the names of its two letters. It runs 543 years ahead of the Common Era, so 2026 is 2569 and a permit that ends in 2570 ends in 2027. Subtract 543. That’s the whole rule.

Two things trip people up. First, Thai offices routinely drop the century: a note reading ก.ค.69 is July 2569, which is July 2026. Chiang Mai Immigration files its own announcements that way. Second, the month is clipped to two pieces — the start of the first syllable, then the start of the last — ม.ค. January, เม.ย. April, ก.ค. July, ต.ค. October — and the digits are often Thai numerals rather than 0–9.

So a stamp that looks like ๓๐ เม.ย. ๗๐ is 30 April 2570. That’s 30 April 2027, about seven months from a September start, not the distant future and not the past.

That is the single most useful thing on this page, and it’s a reading problem, not a legal one. If you’ve never read a Thai character, read your first Thai word right now — no account, two minutes is enough to find out whether it clicks. The Read Thai course takes the characters in the order you’ll actually meet them, and Thai numerals get their own short guide if the digits are what’s stopping you.

What a Non-B Visa in Thailand Actually Says

Your visa is a ตรวจลงตรา(dtrùat long dtraa), literally “to inspect and mark”. It belongs to the class the Immigration Bureau calls คนอยู่ชั่วคราว(khon yùu chûa khraao) — temporary residents, which is what Non-Immigrant is in Thai. It carries the category code B, which the Bureau glosses as การประกอบธุรกิจและการทำงาน(gaan bprà-gàwp thú-rá-gìt láe gaan tham ngaan) — conducting business and working.

Whether it’s a sticker at all depends on when you got it. Since 1 January 2025 the e-Visa system has covered all 94 Thai embassies and consulates-general, and an approved e-Visa is sent to you electronically rather than pasted into the passport. Older visas are the sticker on a passport page. The fields are the same either way.

Per the Bureau’s own training material — written before the e-Visa rollout — a visa carries four things: the type, the category code, the number of entries, and the validity. And here’s the part that matters: that same material says foreigners frequently confuse two of them.

• อายุของการตรวจลงตรา(aa-yú khǎwng gaan dtrùat long dtraa) — the validity of the visa, labelled Enter Before or Expiry date. It’s your deadline to arrive.
• ระยะเวลาพำนักในราชอาณาจักร(rá-yá wee-laa pham-nák nai râat-chá-aa-naa-jàk) — your period of stay in the Kingdom, which does not appear on the visa at all. It comes from the stamp an officer puts in when you land (Immigration Bureau, Passport and Visa Issuance, PDF in Thai).

A teacher who reads “valid until 12 December” on the visa and plans a December departure has misread the document. That date was about getting in.

What to check: the category letter is B, the number of entries matches what your school said it applied for, and your name and passport number match your passport exactly.

The Stamp Holds Your Real Date

The small rectangular stamp the officer adds on arrival records two things: the date you entered, and the date you’re permitted to stay until. When your school extends your stay each year — the annual trip to immigration with a ตม.๗(dtaw maw jèt), form TM.7, the application for extension of stay — an officer stamps the passport again with the date you may stay in the Kingdom until, and signs and dates the stamp alongside it (Immigration Bureau, Application for Extension of Stay, PDF in Thai).

Two words carry that stamp:

Permission, and a date it runs to. The paperwork around the stamp spells the same pairing out in full: ตม.๗ asks for the day your passport is valid until — มีอายุใช้ได้ถึงวันที่(mii aa-yú chái dâi thěung wan-thîi) — so ถึงวันที่(thěung wan-thîi), “until this date”, is worth knowing on sight. Read the date in พ.ศ., compare it against what HR told you, and you’ve done the check that most teachers never do.

What to check: the end date, and whether it matches your contract. If your contract runs to 30 April and the stamp says something else, that’s worth a conversation this week rather than next April.

Your Work Permit Names One Employer

Break the word apart and it explains itself: ใบ(bai) plus อนุญาต(à-nú-yâat) plus ทำงาน(tham ngaan). A certificate of permission to work — and the permission is narrow. It attaches to a named employer, a named job, and a named place.

The fields that define that scope:

• นายจ้าง(naai jâang) — employer: the school, by its registered Thai name, which is often longer and more formal than the name on the gate
• ตำแหน่ง(dtam-nàeng) — what you were hired as
• ประเภทงาน(bprà-phêet ngaan) — the category of work permitted
• สถานที่ทำงาน(sà-thǎan thîi tham ngaan) — the campus or branch

Since 13 October 2568 (2025), the Ministry of Labour has run the whole sequence — submitting the application, checking its status, approval, collecting the permit — through the e-WorkPermit system, so a permit issued now and one issued a few years ago need not look alike (Government PR Department announcement, in Thai). Read the fields, not the format.

Two Slips Teachers Mix Up

The 90-day report is not an extension

Every 90 days, foreigners staying long-term report their address to Immigration. The Thai name is การแจ้งอยู่ในราชอาณาจักรเกิน 90 วัน(gaan jâeng yùu nai râat-chá-aa-naa-jàk goen gâo-sìp wan), filed on form ตม.๔๗ under section 37(5) of the Immigration Act B.E. 2522. You get back a ใบรับแจ้ง(bai ráp jâeng), a notification receipt — and because that slip also carries your next due date, offices call it the ใบนัด(bai nát), the appointment slip.

Samut Prakan Immigration states the distinction outright: reporting your address every 90 days is not an application to stay longer. Different document, different date, sometimes a different counter. Teachers who assume the 90-day slip renewed something are reading two documents as one.

The re-entry permit protects a date you already have

Leaving Thailand ends the permission to stay that’s stamped in your passport — that’s section 39 of the Immigration Act — unless you get a re-entry permit before you go, applied for on form ตม.๘ and stamped straight into the passport, single or multiple. Immigration’s process description is specific about what it does: the officer stamps permission for the time remaining on your current stay, not a fresh period (Tak Immigration, Re-Entry Permit, PDF in Thai). Before an October break or a Songkran flight, the thing to confirm is simply that the stamp is in the book.

What Reading These Fields Actually Buys You

Not protection. Not a shortcut. Certainly not a substitute for the people who do this professionally.

What it buys is the ability to notice. A surname spelled the way a Thai keyboard produces it rather than the way your passport does. A date of birth with the day and month swapped. An end date that doesn’t match your contract. A school name that belongs to the foundation rather than the campus you teach at. None of those are your fault, and none of them are yours to fix — but every one of them is easier to correct in September than in April, and the person best placed to spot it is the person whose name is on the document.

That’s a narrower goal than “learn Thai,” and it’s reachable. You need the letters, the numerals, and about fifteen recurring words. The general vocabulary on Thai forms, bank letters and notices is the same job one level out, and if you’re teaching, reading the class labels and the timetable uses the same letters you’ll learn here. The barrier is the alphabet, and it’s smaller than it looks — this is the reason expats who live here end up learning the script rather than more phrases.

Try the first Thai characters free, no account needed — two minutes tells you whether Thai script clicks for you. From there, the structured alphabet course teaches every consonant and vowel in the order you meet it, with the tone rule behind each one, and the forms-and-letters track points that reading straight at the paperwork on your desk.

Frequently Asked Questions

What is the difference between a Non-B visa and a work permit in Thailand?

They are two documents from two different offices. The visa is a ตรวจลงตรา(dtrùat long dtraa), Immigration’s mark in your passport, and category B covers การประกอบธุรกิจและการทำงาน(gaan bprà-gàwp thú-rá-gìt láe gaan tham ngaan), conducting business and working. The work permit, ใบอนุญาตทำงาน(bai à-nú-yâat tham ngaan), comes from the Ministry of Labour’s Department of Employment and names one employer, one position and one workplace. Different offices, different documents, different dates.

Why does my Thai visa say 2569 instead of 2026?

Thai official documents use the Buddhist Era, พ.ศ., which runs 543 years ahead of the Gregorian calendar: 2026 is 2569, and a permit ending in 2570 ends in 2027. Offices routinely drop the century too, so ก.ค.69 is July 2026, and the digits are often Thai numerals rather than 0–9. Subtract 543, then read the clipped month — ม.ค. January, เม.ย. April, ก.ค. July, ต.ค. October.

Does the expiry date on my Non-B visa mean I have to leave by then?

No. That date, labelled Enter Before or Expiry date, is your deadline to arrive in Thailand. How long you may stay is a separate matter: it comes from the stamp an officer puts in on arrival, and from the extension stamp each year after that. The Immigration Bureau’s own training material says foreigners frequently confuse the two, so read the stamp rather than the visa, and take anything that does not match to your school’s HR office.

Is the 90-day report the same as an extension of stay?

No. The 90-day notification, filed on form ตม.๔๗, tells Immigration where you are living. Samut Prakan Immigration states it outright: reporting your address every 90 days is not an application to stay longer. The receipt you get back, ใบรับแจ้ง(bai ráp jâeng), carries your next due date, which is why offices call it ใบนัด(bai nát), the appointment slip. The extension is a different application, on ตม.๗, with its own date.

What should I check on my Thai work permit?

Four fields set the scope of what it permits: นายจ้าง(naai jâang) employer, ตำแหน่ง(dtam-nàeng) position, ประเภทงาน(bprà-phêet ngaan) type of work, and สถานที่ทำงาน(sà-thǎan thîi tham ngaan) place of work. Read those against your contract, then read your name, passport number and date of birth character by character. The Department of Employment runs a routine application for amending entries on a permit, which tells you how often they get typed wrong — your HR office files it, and noticing is the part that falls to you.