Resignation, role change, new employer: what happens to the visa

01Half of the official invalidation grounds are triggered by the company's own actions

Most companies treat a visa as a one-time project: get it issued, get the person on the job, and consider it done. In reality it is a line permanently attached to the employment relationship — when something changes on the company side, the visa status follows. These changes are usually decided by HR or the business unit, and by the time word reaches whoever handles the paperwork, the window has often already closed.

Grounds that invalidate a visa include: resignation, a role change, a change of visa category, leaving the country without a re-entry permit, a legal violation, the company being deregistered by the competent authority, and misuse of the visa category.

The first two — resignation and a role change — are worth flagging. They are not “accidents”; they are decisions the company itself makes, and they are the ones most easily overlooked:

• Resignation: once someone leaves, the visa and work permit need to be cancelled according to the rules. The basis for residence on employment grounds disappears the moment the employment ends — leaving it unresolved is not “saving effort”, it is leaving the exposure sitting on the company's books. Promoted companies carry an additional rule: notification is required within a set number of days before the employment ends, not after the person has already left.
• Role change: a work permit is issued for a specific position. A promotion, transfer or change in scope of duties may require a corresponding update; for promoted companies, the position itself must first be approved before someone can be placed into it. “Just an internal reassignment” is not an internal matter on this line.

02Changing employer does not mean the visa moves with you

A foreign employee's work permit is tied to their employer. Taking a role at a different Thai company is not as simple as transferring the existing permit over — the new employer runs its own process, and the original employer has to close things out on their end. The gap in between deserves particular care: the old employment has ended and the new one is not yet approved, and the person's status during that window needs to be planned in advance, not left alone on the assumption that “the visa hasn't expired yet”.

03Changes to the company itself carry through as well

A company name change, relocation, a change in shareholding or scope of business, or a change in licence status can all affect a work permit already issued and any future renewal — because those are the very documents the authority originally approved against. If the company is deregistered by the competent authority, the visa falls directly into an invalidation ground. When registering a corporate change, including “do we have foreign staff currently employed” in the impact assessment costs far less than fixing it after the fact.

04Renewal: two preconditions and one deadline that runs the opposite way

• Precondition one: a visa extension requires holding a valid work permit. If the work permit lapses, the extension lapses with it — the two are tied together and cannot be handled separately.
• Precondition two: each approved extension has a cap; it is not granted once for indefinite validity.
• Deadline: an extension must be filed at least 15 days before the current visa expires, with the result issued within the prescribed period. Note this runs the opposite direction from the 90-day report — the report can only be filed within 15 days before the due date, and the system will not accept it earlier. Mixing up the two 15-day windows is a common way to get this wrong.

Renewal also typically looks at the holder's personal income tax payment and social security contribution record during the period of employment. In other words, whether payroll withholding and social security filings were kept clean day to day gets tested at the moment of renewal.

05Build it into HR process, not into someone's memory

This line rarely goes wrong because it is difficult — it goes wrong because the person who makes the decision and the person who handles the paperwork are not the same person. A workable approach:

• Add a fixed check — “does this involve a foreign employee currently on the books” — into the HR and legal workflow for four types of action: resignation, role change, salary change, and corporate registration changes.
• Keep a rolling record for each foreign employee: visa expiry date, work permit expiry date, next 90-day report due date, current position, and whether the most recent departure had a re-entry permit filed.
• Build in lead time between the decision and the effective date — particularly for resignation and role changes, where the window sits between the decision and when it takes effect, not after.

The specific process, documents required and timeframes for each type of change vary by situation and company type, and are updated by the competent authorities; this page does not list specific figures. If your company has an upcoming HR or corporate registration change involving foreign staff currently employed, we recommend having the advisory team check it person by person before proceeding — on this line, the cost of fixing a problem afterwards is far higher than planning for it in advance. See also the four-stage process for sending a Chinese employee to work in Thailand and when a business visa is no longer the right fit.