The Non-Immigrant “B” visa is how foreigners come to work for a Thai employer or run a business in Thailand — the visa that pairs with a work permit. One label covers two paths, employment and business, and the visa sticker is only the start: the real long stay comes from a renewable one-year extension of stay based on employment. Here’s the plain-English version — single vs multiple entry, the 90-day-to-one-year route, what your employer must provide, how the visa and the work permit mirror each other, what changing jobs does to your status, and how your family follows on a Non-O. Unbiased, never paid placement.
If your reason to be in Thailand is a job or a business, the Non-Immigrant B is your category. The visa gives you 90 days (or a one-year multiple-entry from abroad); your employer sponsors a work permit; and the long stay comes from a renewable one-year extension of stay based on employment. The visa and the work permit are two separate documents that must line up, the permit is tied to one employer, and your family follows on a dependent Non-O — which does not include the right to work.
Editorial analysis compiled and periodically refreshed by BAANLYY’s research team — not a live data feed.
Analysis last reviewed 2026-07-05.
Thailand sorts long-stay foreigners by purpose. The Non-O covers family, marriage and retirement; the ED covers study — and the Non-Immigrant “B” (Business) is the category for employment and business. It is the visa that exists to be paired with a work permit: the Non-B gives you the right to be in the country for a work purpose, and the separate permit gives you the right to do the actual job. The visa itself is short — a 90-day single-entry, or a one-year multiple-entry issued abroad — and the part that lets people work here for years is the separate, renewable one-year extension of stay based on employment you obtain inside Thailand once your job and permit are in place. Get that distinction right and the whole system makes sense. Background on the work itself is in working in Thailand.
Most people on a settled local job take the single-entry-then-extend path; frequent regional travellers sometimes prefer the multiple-entry. Either way, the extension of stay — not the visa sticker — is what gives the stable year.
The visa is the doorway; the extension of stay based on employment is how people actually live and work here. After you arrive on the 90-day Non-B and your employer secures your work permit, you go to your local immigration office before the 90 days expire and apply for a 12-month extension, submitting the company paperwork (commercial registration, VAT and financial filings, the Thai-staff-ratio evidence), your work permit, tax records and personal documents. Once granted it gives a full year, renewed annually the same way for as long as you keep the qualifying job. Treat the window seriously — missing it can force you to leave and re-enter to restart. You will also want a Thai bank account for salary and the financial paperwork; see opening a Thai bank account.
In practice many business owners end up holding a Non-B and a work permit through their own qualifying Thai company. The evidence differs: employment leans on the employer’s sponsorship letter and company filings; business leans on the company you are forming or directing, its registration and capital.
The single most important thing to understand: the Non-B and the work permit are two separate documents that must line up. The Non-B is the visa (foreign-affairs/immigration side) that lets you be here for work; the work permit is a separate booklet (Ministry of Labour side) that authorises you to do a specific job, for a named employer, in a named position and location. You generally need the Non-B first to apply for the permit, and you need the permit to get the one-year extension of stay. They mirror each other but are issued, renewed and cancelled separately — and if the work permit is cancelled, your permission to stay is usually cut short. Doing paid work on a Non-B without a valid work permit is illegal; even unpaid “work” can count. The full labour-side detail — capital and staff-ratio rules, BOI streamlining, the DTV/LTR alternatives — is in the work permits in Thailand guide.
Sponsorship is document-heavy and sits mostly with the company:
Thresholds and forms change, so have the employer’s HR or a licensed agent confirm the current list before you file.
Because a work permit is tied to one specific employer, changing jobs is not automatic — you cannot carry the same permit to a new company. The clean route is for the old employer to cancel the work permit and the new employer to sponsor a fresh one, after which your extension of stay is re-based on the new employment. Timing is the trap: when a permit is cancelled your permission to stay can be shortened to a short grace window, so the new job’s paperwork should be ready to file quickly, ideally back-to-back. Some people leave and re-enter on a new Non-B to reset cleanly. Plan a job change with both employers — and, if possible, a visa agent — so you don’t fall out of status in the gap.
Your family can come, but on a different visa. The spouse and children of a Non-B holder generally enter on a Non-Immigrant O (dependent) visa, sponsored by your employment and status, and obtain their own one-year extension of stay as your dependents. That dependent status does not include the right to work: a spouse who wants a job needs their own Non-B and work permit (or another working visa such as the SMART Visa or LTR). Children can enrol in school on the dependent O. The dependents’ extensions lean on your job and finances rather than theirs, so keep your employment documents current — they underpin the whole family’s stay.
The same long-stay housekeeping applies, and immigration asks for it at extension time:
Detail in TM30 & 90-day reporting.
A Non-B usually means a real job and a multi-year horizon, so renting should match it. A standard 12-month lease in a building with reliable fibre, near the BTS/MRT or close to the office, is the norm; landlords readily accept a Non-B, its work permit and the one-year extension as stable status to sign. You’ll show your passport, visa/extension page and the usual deposit (commonly two months’ security plus one month advance). One practical link to the visa: your lease and a clear address make the TM30 filing and the extension paperwork far smoother, since immigration wants proof of where you live — and a salary deposited to a Thai account streamlines the financial side. Model a realistic monthly number first with the cost-of-living calculator.
Related reading: where to live, working in Thailand, renting in Thailand, and tax for expats.
A Non-B and a real job deserve a long-stay base near the office and the BTS. Explore areas and residences built for living here, not just visiting.
General information only — not legal, tax, immigration or financial advice. Thailand’s Non-Immigrant B visa entry types, work-permit pairing, employer-sponsorship requirements, capital and staff-ratio rules, extension-of-stay conditions, employer-change procedures, dependent routes and reporting duties change and are applied case by case by individual Thai immigration offices, the Ministry of Labour and embassies; confirm current details with the Thai immigration bureau, the Ministry of Labour, an official Thai embassy/consulate, or a licensed Thai immigration lawyer before relying on anything here. BAANLYY never takes paid placement.
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.