Employment Law in Thailand: A Complete 2026 Guide

Introduction

If you employ staff in Thailand as a foreign company, three pieces of legislation govern almost everything: the Labour Protection Act B.E. 2541, the Labour Relations Act B.E. 2518, and the Social Security Act B.E. 2533. Getting any of these wrong on hiring terms, working hours, leave entitlements, termination procedures, or severance calculations exposes your company to formal complaints with the Department of Labour Protection and Welfare and, in many cases, to claims at the Labour Court.

Two recent developments make 2026 a year when foreign employers cannot afford to rely on outdated HR policies. First, the Labour Protection Act (No. 9) B.E. 2568 came into force on 7 December 2025, expanding maternity leave to 120 days, introducing 15 days of paid paternity leave for the first time in Thai private-sector law, and adding a mandatory annual reporting obligation for employers with ten or more staff. Second, the social security wage ceiling rose from THB 15,000 to THB 17,500 on 1 January 2026, increasing maximum employer contributions.

This guide explains the rules that matter most for international employers running operations in Thailand, where the most common costly mistakes happen, and what changed in late 2025 that almost every foreign employer needs to act on.

1. Employment Law in Thailand at a Glance

The table below summarises the headline obligations that apply to most foreign employers operating in Thailand in 2026.

Topic	2026 Position
Primary statute	Labour Protection Act B.E. 2541 (as amended through No. 9, B.E. 2568)
Minimum wage	THB 337–400 per day, varies by province
Standard working hours	Maximum 8 hours/day, 48 hours/week (42 hours for hazardous work)
Overtime rate	1.5× normal wage on workdays; 2× or 3× on holidays
Annual leave	Minimum 6 days after 1 year of continuous service
Maternity leave	120 days per pregnancy (60 paid by employer)
Paternity / spousal leave	15 days, fully paid by employer (new in Dec 2025)
Social security contribution	5% of wages, capped at THB 875/month (employer and employee each)
Foreign-to-Thai employee ratio	Typically 1 work permit per 4 Thai employees
Severance pay	30–400 days of wages, depending on length of service
Annual conditions report	Mandatory by January for employers with 10+ employees

2. The Three Laws That Govern Almost Everything

Thai employment law is not contained in a single code. For practical purposes, foreign employers need to understand three statutes.

Labour Protection Act B.E. 2541 (the LPA)

The LPA is the foundational statute. It sets minimum standards on wages, working hours, leave, holidays, severance pay, and termination. It applies to virtually all private-sector employers in Thailand regardless of size, with limited exceptions for genuinely seasonal or project-based contracts. The LPA has been amended nine times, most recently by Act No. 9 of B.E. 2568, in force since 7 December 2025.

Critically for foreign employers: the LPA is mandatory. Contractual provisions that give employees less than the LPA minimum are unenforceable, even if the employee signed the contract willingly. You cannot contract out of statutory severance, leave, or overtime entitlements.

Labour Relations Act B.E. 2518

The Labour Relations Act governs collective bargaining, union activity, work rules, and dispute resolution. For most foreign employers in Thailand, particularly those without unionised workforces, its most relevant provisions are the rules requiring written work rules (in Thai) for any employer with ten or more employees, and the Labour Court’s jurisdiction over termination disputes.

Social Security Act B.E. 2533

The Social Security Act establishes mandatory employer and employee contributions to the Social Security Fund. Both employer and employee contribute 5% of monthly wages, subject to a wage ceiling. As of 1 January 2026, that ceiling rose from THB 15,000 to THB 17,500, lifting the maximum monthly contribution per party from THB 750 to THB 875.

Foreign employees on work permits are also covered by the Social Security Fund, there is no exemption based on nationality for employees working under a Thai work permit.

3. Hiring Employees in Thailand: What Foreign Employers Must Get Right

Employment contracts

Thai law does not require employment contracts to be in writing, but proceeding without a written contract is a serious error. A written employment contract should, at minimum, address: position and duties, start date, wage and pay frequency, working hours, leave entitlements, probation period, place of work, and termination procedures.

If your workforce includes both Thai and foreign employees, the practical norm is a bilingual contract (Thai and English, with one language designated as controlling in the event of dispute). Where Thai law sets a minimum entitlement, the contract cannot reduce it, but it can improve on it. Many foreign employers offer enhanced annual leave, private health insurance, and provident fund contributions as differentiators in a competitive talent market.

Probation periods

There is no statutory minimum or maximum probation period under the LPA, but the threshold that matters is 120 days of service. Employees terminated without cause after 120 days of continuous service are entitled to severance pay. Many foreign employers therefore set probation at 119 days, a practice that is legally permissible but should be approached carefully, because the Labour Court will look at the substance of the relationship, not just the contract wording.

The 4:1 Thai-to-foreign employee ratio

Under Thai immigration and labour regulations, a foreign company generally needs to employ four Thai nationals for every one foreign work permit it sponsors. Board of Investment (BOI)-promoted companies and certain other categories enjoy relaxations of this ratio, but for most non-promoted companies it is a hard constraint. Plan your headcount accordingly: if you want to bring three foreign managers to Thailand, you will need to demonstrate twelve Thai employees on your payroll.

Work rules

Any employer with ten or more employees must publish written work rules in Thai. The rules must address working hours, holidays, overtime, wages, leave, discipline, complaints procedures, and termination, and they must be displayed in the workplace. Failure to maintain compliant work rules is one of the most common findings in Department of Labour Protection inspections of foreign-owned businesses.

4. Wages, Working Hours & Mandatory Benefits

Minimum wage by province (2026)

Thailand’s minimum wage is set per day, not per hour or per month, and varies by province. The current rates, in force since 1 July 2025 and unchanged through 2026, are as follows.

Daily Rate (THB)	Provinces / Areas
400	Bangkok, Phuket, Chonburi, Rayong, Chachoengsao, Koh Samui (Surat Thani). Also applies nationally to all hotels (Type 2, 3, 4 under the Hotel Act) and entertainment venues.
380	Selected high-cost provinces in central and eastern Thailand
355–372	Most provinces in central, northern, and northeastern Thailand
337	Narathiwat, Pattani, Yala (the three southernmost provinces)

Practical translation: a Bangkok worker on the THB 400 minimum, working a typical 26-day month, earns around THB 10,400 per month. The minimum wage applies to all sectors and to all employees, including foreign workers and domestic staff.

Working hours and overtime

Standard hours under the LPA are a maximum of 8 hours per day and 48 hours per week for general work. Hazardous work is capped at 7 hours per day and 42 hours per week. Overtime is paid at 1.5× the normal hourly rate on workdays, 1× the rate for working on a public holiday, and 3× the rate for overtime worked on a public holiday. Employees cannot be required to work more than 36 hours of overtime per week.

Social security contributions in 2026

Both employer and employee contribute 5% of monthly wages to the Social Security Fund. The wage ceiling for the calculation rose on 1 January 2026 from THB 15,000 to THB 17,500. The practical effect: the maximum contribution per party is now THB 875 per month, up from THB 750. For an employee earning THB 17,500 per month or more, employer monthly social security cost is THB 875.

Provident fund (voluntary but expected)

Provident fund contributions are not mandatory under Thai law, but most multinational and large Thai employers offer 5–10% employer matching. For foreign companies competing for senior Thai professional talent, the absence of a provident fund is a meaningful disadvantage. Provident fund schemes are tax-advantaged for both the employer and the employee.

5. Leave Entitlements (Including the December 2025 Amendments)

Leave is one of the most heavily updated areas of Thai employment law. The Labour Protection Act (No. 9) B.E. 2568, which came into force on 7 December 2025, materially expanded family-related leave for all private-sector employers. Foreign employers’ HR policies and work rules must reflect the new entitlements; Department of Labour inspections in 2026 will be looking for compliance.

Leave Type	2026 Entitlement	Employer Cost
Annual leave	Minimum 6 days per year after 1 year of continuous service	Full pay
Sick leave	Up to 30 days per year (medical certificate required for 3+ consecutive days)	Full pay
Personal business leave	Minimum 3 days per year	Full pay
Public holidays	Minimum 13 days per year (employer designates)	Full pay
Maternity leave	120 days per pregnancy (was 98 before Dec 2025)	60 days fully paid by employer (was 45)
Paternity / spousal leave	15 days, taken within 90 days of childbirth (NEW)	Full pay
Infant-care leave (medical)	Additional 15 days where newborn has a medically certified condition (NEW)	50% of wages
Military service leave	Up to 60 days per year, full pay	Full pay
Training leave	As required by the employer or government training programmes	Per work rules

What this means in practice

Three actions are now required of every foreign employer in Thailand:

Update employment contracts and employee handbooks to reflect the new 120-day maternity, 15-day paternity, and 15-day infant-care entitlements.
Reconfigure payroll and HR systems to track and pay the new leave categories, particularly the 50% pay rate on infant-care leave.
Submit the annual employment conditions report (Kor Ror 11) to the Department of Labour Protection and Welfare each January, if you have 10 or more employees. This was previously required only on inspector request; it is now an automatic obligation.

6. Managing Performance & Workplace Compliance

Thai labour law gives employees significant procedural protections in performance and conduct matters. The single most important principle for foreign managers to internalise: you cannot terminate an employee for cause without severance unless you can prove, with documentation, that the cause falls within the six grounds in Section 119 of the LPA.

Written warnings

With limited exceptions for serious offences, an employer wishing to dismiss for misconduct without severance must first issue a written warning that specifically describes the offence, states the rule that has been breached, and warns that repetition will result in termination. Verbal warnings carry no weight. Generic warnings are insufficient. The warning is valid for one year from the date of the offence.

Foreign managers accustomed to at-will employment in jurisdictions like the US frequently underestimate this. A poorly performing employee who has not received documented warnings cannot lawfully be dismissed without paying full severance, even if performance issues are genuine.

Performance improvement plans

PIPs are not specifically recognised in Thai law, but they are useful evidence in defending termination decisions if drafted carefully. A PIP should set measurable objectives, a defined review period, and clear consequences. If performance does not improve, the employer’s decision to terminate must still be supported by documentation showing fair process.

7. Termination & Severance: Where Foreign Employers Get It Wrong

Termination is the single area of Thai employment law where foreign employers most frequently make expensive mistakes. The Labour Court is widely regarded as employee-friendly, court fees do not apply to employee claimants, and the burden of proof rests on the employer to demonstrate just cause.

Statutory severance schedule

Where employment is terminated without statutory cause, severance pay is calculated as follows under Section 118 of the LPA, as amended in 2019.

Length of Continuous Service	Severance Pay (days of last wages)
Less than 120 days	None
120 days to under 1 year	30 days
1 year to under 3 years	90 days
3 years to under 6 years	180 days
6 years to under 10 years	240 days
10 years to under 20 years	300 days
20 years or more	400 days (added by 2019 amendment)

Worked example: an employee earning THB 60,000 per month who is terminated without cause after 8 years of service is entitled to 240 days of severance, calculated on a daily basis as THB 60,000 ÷ 30 × 240 = THB 480,000.

Note that ‘wages’ for severance purposes include basic salary plus any fixed regular payments, but exclude overtime, irregular bonuses, and reimbursements.

The six grounds for dismissal without severance

Section 119 of the LPA permits dismissal without severance in only six specific situations:

Dishonest performance of duties or intentional commission of a criminal offence against the employer.
Intentionally causing damage to the employer.
Performing duties negligently to the extent of causing the employer serious damage.
Violating work rules, regulations, or lawful and equitable orders, after a written warning has been issued (except in serious cases where no warning is required).
Absence from duty for three consecutive working days without justifiable reason, regardless of intervening holidays.
Imprisonment by a final court judgment, except for petty offences or offences arising from negligence.

Crucially, Section 17/1 of the LPA (added by the 2019 amendment) requires the employer to specify the reason for termination in writing at the time of dismissal. If the reason is not stated in the termination letter, the employer cannot later rely on it in a Labour Court dispute.

Notice periods

Thailand does not have a fixed statutory notice period in days. Section 17 of the LPA requires advance notice on or before a wage payment date, with the termination effective on the next wage payment date. For monthly-paid employees, that effectively means roughly one month’s notice. Payment in lieu of notice is permitted. A notice period of more than three months is not enforceable.

Unfair termination claims at the Labour Court

Even where statutory severance has been paid in full, an employee may still bring an unfair termination claim under Section 49 of the Act on the Establishment of and Procedure for Labour Court. If the Labour Court finds the dismissal unfair, it may order reinstatement at the same wage and seniority, or, more commonly, additional compensation. Total awards (statutory severance plus unfair dismissal compensation) commonly reach 6–18 months of salary, depending on tenure, age, the difficulty of the employee finding new employment, and the employer’s conduct.

8. Common Pitfalls for Foreign Employers

In our experience advising international companies in Thailand, the same handful of mistakes recur. The most expensive ones are listed below.

Treating fixed-term contracts as a workaround for severance. Thai courts routinely treat repeatedly renewed fixed-term contracts as de facto permanent employment. Severance is owed on termination, regardless of the contract label.
Skipping the written warning step. If you intend to dismiss for performance or misconduct without severance, the written warning is not optional. No warning, no Section 119 defence, full severance owed.
Failing to state the reason for termination in writing. Section 17/1 means the reason on the termination letter is the only reason you can rely on in court. Vague letters that say ‘company restructuring’ close off other defences.
Ignoring the work rules requirement. Employers with 10+ staff must maintain Thai-language work rules covering termination, discipline, and complaints. Inspections routinely find foreign employers without compliant rules.
Underpaying social security after the 2026 ceiling change. From 1 January 2026 the wage ceiling is THB 17,500. Payroll systems still calibrated to the THB 15,000 ceiling are now under-contributing.
Not updating policies for the December 2025 leave amendments. Maternity leave is now 120 days, paternity leave 15 days, and the annual employment conditions report is mandatory each January. Old handbooks need to be rewritten.
Misclassifying employees as independent contractors. If the working relationship displays the characteristics of employment (control, integration, exclusivity), Thai courts will treat it as employment regardless of the contract label, with full LPA entitlements applying retrospectively.

9. How Narai Partners Helps Foreign Employers

Narai Partners is a boutique international law firm in Bangkok serving foreign companies operating in Thailand. Clients work directly with director and partner-level lawyers, not junior associates, and the team is bilingual in English and Thai with international law firm backgrounds.

On employment matters, we typically advise on:

Drafting and reviewing employment contracts and Thai-language work rules compliant with the LPA as amended through December 2025.
Updating HR policies to reflect the 2026 leave entitlements and the social security ceiling change.
Structured termination advice: assessing severance exposure, preparing termination letters, and managing the dismissal process to minimise unfair termination risk.
Defending Labour Court claims, including unfair termination, unpaid severance, and Department of Labour Protection complaints.
Work permit applications and the 4:1 ratio compliance for foreign employees.
Annual employment conditions reporting (Kor Ror 11) and ongoing labour compliance audits.

To discuss a specific employment matter or arrange a confidential consultation with our employment law team, see our employment & labour service page or book an online consultation.

10. Frequently Asked Questions

Does Thai employment law apply to foreign employees on work permits?

Yes. The Labour Protection Act applies to all employees working in Thailand regardless of nationality. Foreign employees are entitled to the same statutory minimums on wages, leave, severance, and working hours as Thai nationals, and they are also covered by the Social Security Fund.

Can I dismiss an employee during their probation period without severance?

Only if the probation period is shorter than 120 days. Once an employee has completed 120 days of continuous service, including probation, statutory severance is owed on termination without cause. Many foreign employers therefore set probation at 119 days, but Thai courts will look at the substance of the relationship, not just the contract.

How much notice do I need to give to terminate an employee in Thailand?

There is no fixed statutory notice period in days. Notice must be given on or before a wage payment date and takes effect on the following wage payment date, for monthly-paid employees, this is effectively about one month. Payment in lieu of notice is permitted. Notice periods longer than three months are not enforceable.

What are the severance amounts for a 5-year and 10-year employee?

An employee with 5 years of continuous service is entitled to 180 days of severance pay, calculated on the last wage rate. An employee with exactly 10 years of service is entitled to 300 days. The maximum statutory severance is 400 days, payable to employees with 20 or more years of service following the 2019 amendment.

Are the new paternity leave and maternity leave changes mandatory for all employers?

Yes. The Labour Protection Act (No. 9) B.E. 2568 came into force on 7 December 2025 and applies to all private-sector employers in Thailand. Employers must provide 120 days of maternity leave per pregnancy (with 60 days fully paid), 15 days of fully paid paternity / spousal leave, and 15 days of infant-care leave at 50% pay where the newborn has a medically certified condition.

Do I need work rules for my Thailand operation?

If you employ 10 or more people in Thailand, written work rules in Thai are mandatory. They must cover working hours, wages, overtime, leave, holidays, discipline, complaint procedures, and termination, and they must be displayed in the workplace. Compliant work rules are also a critical defence in any Labour Court dispute.

What is the 4:1 ratio and does it apply to my company?

Most foreign companies in Thailand must employ four Thai nationals for each foreign employee they sponsor for a work permit. Companies promoted by the Board of Investment (BOI) and certain other categories enjoy relaxations of this ratio. If you plan to bring multiple foreign managers to Thailand, you need to plan your Thai headcount accordingly.

What is the annual employment conditions report (Kor Ror 11)?

Following the December 2025 amendment, all employers with 10 or more employees must submit an annual report on employment and working conditions to the Department of Labour Protection and Welfare each January. Previously, this was required only when a labour inspector requested it; it is now an automatic compliance obligation.

11. Conclusion & Next Steps

The 2026 Thai employment law landscape is meaningfully different from the position 12 months ago. The December 2025 LPA amendments expanded family-related leave entitlements, the social security wage ceiling rose on 1 January, and the annual employment conditions report is now a standing obligation rather than a triggered one. Foreign employers that have not refreshed their employment contracts, work rules, employee handbooks, and payroll configurations within the last six months are likely to be out of compliance in at least one area.

The financial exposure of getting this wrong is real. A single unfair termination claim at the Labour Court can result in awards of 6–18 months of salary on top of statutory severance, plus legal costs. Department of Labour inspections that find non-compliant work rules, missing annual reports, or under-paid social security can result in fines and remediation orders. Both kinds of risk are entirely avoidable with current compliant documentation and correct payroll configuration.

If your business operates in Thailand with employees on the ground, the questions worth asking now are: are our employment contracts current? Do our work rules reflect the December 2025 leave amendments? Has our payroll system been updated for the 2026 social security ceiling? Have we filed the Kor Ror 11 report this January? Where the answer to any of these is uncertain, an employment law audit is the right starting point.

To discuss your business’s employment law position in Thailand or arrange a confidential consultation,
contact the Narai Partners team or book an online consultation with one of our director-level lawyers.

Employment Law in Thailand: A Complete 2026 Guide for Foreign Employers