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SUWANVARA LAWFIRM
Suwanvara Law Firm Co., Ltd.
SUWANVARA LAWFIRM
SUWANVARA LAWFIRM
Suwanvara Law Firm Co., Ltd.
Labor Law

Probation: Termination During Probation – What Are the Limits, and the 119 Days Many Companies Misunderstand

Thai labor law has no 'probationary period' status that exempts employees from protection. A probationary employee is a full employee. What differs is accumulated working time, not the level of protection.

by Legal Advisory TeamAugust 22, 20263 min read
Probation: Termination During Probation – What Are the Limits, and the 119 Days Many Companies Misunderstand

“You’re still on probation, so you can be let go immediately—no need to pay anything.” This is a phrase often heard from both employers and employees, and it is a phrase that does not align with Thai labor law.

The truth is that Thai labor protection law does not recognize a special status called “probationary employee” that receives less protection than others. A probationary employee is a full employee from the first day. What differs is accumulated length of service, which determines certain rights—not the level of protection.

What still needs to be done even during the probationary period

  • Advance notice before termination as prescribed by law, unless an exception applies, such as in the case of an employee committing serious misconduct as specified by law.
  • Pay wages and overtime as usual at a rate not lower than the local minimum wage.
  • Register for social security — do not wait until after the probationary period.
  • Provide statutory holidays — weekly holidays and public holidays.
  • Do not discriminate or terminate on prohibited grounds, such as pregnancy.

The 120-Day Line and the Misunderstanding About 119 Days

Some employee rights begin when the employee has completed 120 days of work. Quite a few companies therefore set their probation periods to end before that line is reached.

What both sides should understand clearly:

  • Ending before 120 days does not exempt the duty to give advance notice
  • Ending before 120 days does not prevent an unfair dismissal claim — that is a separate matter from rights tied to length of service
  • Dismissing and rehiring the employee repeatedly so that length of service does not accumulate is a pattern that can be challenged as an evasion of the law

Employer's side: How to make probation actually work

Set it out clearly in the contract The duration, assessment criteria, and consequences of failing

Assess for real and back it up with documents A probation failure that cannot be explained by any documentation at all is the weakest case when it comes to review

Notify the result before the deadline Not after it

Give proper advance notice Or pay in lieu of notice as required by law

Don't use the word "probation" as a catch-all excuse Because when it comes to review, what is examined is the facts of the employment and the documents on record, not the name given to the status

Employee side: What to keep

  • Employment contract or letter notifying employment conditions, including the text specifying the probationary period
  • Evidence of the actual start date, which sometimes does not match the date in the contract
  • Salary slips and evidence of contribution deductions
  • Messages or emails notifying the probation results
  • Written evaluation records or feedback

These documents are what make the case progress when going to the labor inspector or the labor court. Verbal statements alone are often insufficient.

If you are dismissed during the probation period and feel it is unfair

There are two main options: filing a complaint with a labour inspector or filing a lawsuit with the Labour Court. Each suits different situations, and both have deadlines to watch out for. The guide to choosing between a labour inspector and the Labour Court already explains the selection criteria.

Read more

📌 See more: Labor cases

Both employers who want to establish a rigorous probation system and employees who have been abruptly dismissed can consult a lawyer for free. Call 092-254-2045


This article provides general information and is not legal advice for any specific case.

Frequently asked questions

During probation, can the employer terminate employment at will?+

Termination is possible, but that does not mean it can be done with no conditions at all. A probationary employee is an employee under the labor protection law just like any other employee. Termination therefore still requires advance notice as prescribed by law, unless an exception applies, and may still be challenged as unfair dismissal if the reason used carries no weight or contradicts the facts.

Why do many companies set probation at 119 days?+

Because certain employee rights are tied to completing 120 days of work, a number of companies set the probation period to end before that threshold. This method is not prohibited in itself, but it does not provide the immunity commonly understood, because advance notice must still be given. And if the employment pattern clearly indicates an attempt to circumvent the law—e.g., terminating and rehiring in a continuous loop—it can be raised as an issue for dispute.

If the probation period has passed but no one informed me, does it count as passing?+

If the agreed period has elapsed and the employee continues working while the employer continues accepting the work as normal, the employment is generally regarded as continuing on a regular employee basis. An employer who wishes to rely on the results of probation should assess and notify the outcome in writing before the period ends, rather than letting the deadline pass and later claiming the employee was still on probation.

Can the probation period be extended further?+

In practice, this is done, and it is possible if both parties clearly agree in writing before the original period ends, stating the reason and the new duration. However, it must be understood that extending the period does not stop the clock on the accumulated working time used to calculate other rights. The working time always continues to run from the first day of employment.

If I resign during probation, must I give advance notice?+

You must give advance notice as prescribed by law or the contract as well. The obligation to give notice applies to both parties, not only the employer. Disappearing without notice during probation may allow the employer to claim damages in some cases, and it often affects references when applying for a new job.

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