Thailand Business Visa (Non-Immigrant B): Complete Guide for Foreign Professionals

The Non-Immigrant B visa gets you into Thailand legally to work or do business. It does not, by itself, let you actually start working. That distinction — a visa that grants entry versus a work permit that grants authorization — is where a meaningful share of foreign professionals get their timeline wrong, sometimes discovering only after arrival that there’s a second application still ahead of them before their first day on the job is legal.

What the Non-B Visa Actually Is

The Non-Immigrant B visa is the mandatory entry category for any foreign national who intends to work, take up employment, or conduct business in Thailand. It comes in two entry formats: single-entry, valid for three months from issuance, and multiple-entry, valid for up to one year — though in both cases, each individual entry only grants an initial 90-day stay in the country, not the full validity period of the visa itself.

This visa is distinct from a business visit — if the purpose is meetings, negotiations, or exploring opportunities without taking up actual employment or ongoing business activity, a business visa on a shorter, non-work basis may be more appropriate. The Non-B specifically anticipates employment or active business operation.

The Two-Stage Process: Visa, Then Work Permit

Stage one: obtain the Non-B visa. This is applied for at a Royal Thai Embassy or Consulate abroad, or through the e-Visa portal where available. The core requirement is a job offer or business role from a legally registered Thai company willing to sponsor the application, along with the employer’s supporting documents — company registration, financial statements, and evidence the company meets Thailand’s work permit sponsorship criteria (paid-up capital thresholds and the 4:1 Thai-to-foreign-employee ratio, covered in more detail in our guide to work permits in Thailand).

Stage two: obtain the work permit. Once in Thailand on the Non-B visa, the sponsoring employer applies for the work permit at the Ministry of Labour — this must happen within the initial 90-day stay period. Critically, the visa alone does not authorize work. Beginning employment before the work permit is issued is illegal, regardless of how far along the visa and paperwork process is.

Stage three: extend the stay. Before the initial 90-day stay expires, the holder applies for a one-year extension of stay at the local Thai Immigration office, generally granted on the basis of continued employment and a valid work permit. This extension — not the original visa — is what allows a full year of legal residence tied to the job.

Costs Beyond the Visa Fee Itself

Budgeting for a Non-B visa and the accompanying work permit involves more than the headline visa fee:

• Work permit fee, typically ranging from 750 to 3,000 THB depending on the permit’s duration
• Translation costs for any foreign-language supporting documents that need to be submitted in Thai
• Potential apostille or legalization fees for documents issued abroad
• Re-entry permit fees if travel outside Thailand is planned before the extension process is complete — 1,000 THB for a single re-entry, 3,800 THB for a multiple re-entry permit. Leaving Thailand without a valid re-entry permit cancels the visa outright, requiring the entire process to restart from an embassy or consulate abroad.

Compliance Obligations That Continue After Approval

Getting the visa and work permit issued isn’t the end of the compliance requirements — several run for as long as the holder remains in Thailand on this basis:

• 90-day address reporting. Foreign employees on an extended Non-B stay must report their current address to Thai Immigration every 90 days. This is a standing legal obligation, not a one-time filing, and missing it carries its own penalty separate from any overstay issue.
• Annual extension renewal. The one-year extension must be renewed before each anniversary, generally requiring updated employment documentation and, depending on the case, financial evidence similar to the original application.
• Salary thresholds. Thailand sets minimum salary requirements for foreign workers that vary by nationality, generally ranging from roughly 25,000 to 50,000 THB per month. A role offered below the applicable threshold for the employee’s nationality can complicate both the visa and work permit approval.
• Prohibited occupations. Certain categories of work — including various forms of manual labor, farming, and specific service roles — are reserved for Thai nationals under the Foreign Employment Act and are not open to foreign workers regardless of visa status.

Family Members

A Non-B visa holder’s spouse and dependents can apply for a Non-Immigrant O visa on the basis of the primary holder’s status. This grants them legal residence but does not itself authorize them to work — any dependent who wants to be employed needs to go through a separate work permit process in their own right.

Common Mistakes

Assuming the visa alone permits work. This is the single most consequential misunderstanding. Working in Thailand without a valid work permit — even while holding a valid Non-B visa — carries serious penalties, including fines, imprisonment, and deportation.

Missing the 90-day work permit application window. The employer must file for the work permit within the initial 90-day stay. Delays on the employer’s side can leave a newly arrived employee unable to legally begin work well past their intended start date.

Leaving Thailand without a re-entry permit. A visa or extension of stay is automatically voided by departure without a re-entry permit, regardless of how much of the annual validity period remains.

Overlooking the salary threshold for the employee’s specific nationality. These thresholds aren’t uniform, and a role structured around a salary that satisfies one nationality’s threshold may fall short for another.

How Harwell Legal Helps

We manage the full Non-B visa and work permit process for both employers and employees — assessing sponsoring company eligibility before an offer is finalized, preparing and filing both the visa and work permit applications, and managing the ongoing compliance calendar (90-day reports, annual extensions, re-entry permits) so nothing lapses unnoticed.

Bringing on a foreign employee, or planning to work in Thailand yourself? [Contact Harwell Legal International] before finalizing an offer — confirming the sponsoring company meets the requirements up front avoids a stalled application after an employee has already relocated.