Thailand Payroll System Overview
Thailand payroll is not just about paying salaries. It is a compliance framework involving:
- Personal Income Tax (PND1 withholding)
- Social Security Fund (SSO contributions)
- Statutory filings
- Termination and severance obligations
Most payroll errors in Thailand happen not in calculation, but in how these components interact.
What Is PND1 in Thailand?
PND1 is the monthly personal income tax withholding return.
Key facts:
- Employers must withhold tax from employee salaries
- Filing deadline:
- 7th (paper)
- 15th (e-filing)
- Annual certificate: PND1 Kor
Thailand Personal Income Tax Rates (2026)
Thailand uses progressive tax rates based on annual income:
| Annual Income (THB) |
Tax Rate |
| 0 – 150,000 |
0% |
| 150,001 – 300,000 |
5% |
| 300,001 – 500,000 |
10% |
| 500,001 – 750,000 |
15% |
| 750,001 – 1,000,000 |
20% |
| 1,000,001 – 2,000,000 |
25% |
| 2,000,001 – 5,000,000 |
30% |
| Above 5,000,000 |
35% |
Social Security (SSO) Contributions in Thailand (2026)
Verified update:
- Wage ceiling: THB 17,500
- Effective: 1 January 2026
| Contribution Type |
Rate |
Salary Cap |
| Employee |
5% |
THB 17,500 |
| Employer |
5% |
THB 17,500 |
Key takeaway:
- Maximum contribution = THB 875/month per party
- Employee contributions are tax deductible
Gross-to-Net Salary Calculation (Thailand Example – 2026)
Scenario
- Monthly gross salary: THB 50,000
- Annual salary: THB 600,000
Step 1: Employee SSO
- 5% × THB 17,500 cap = THB 875/month
- Annual SSO = THB 10,500
Step 2: Taxable Income
In Thailand, taxable income must deduct:
- Personal allowance
- Employee SSO contributions
Assumptions (clearly stated):
- Personal allowance: THB 60,000
- No additional deductions
Calculation:
- 600,000
- Less 60,000
- Less 10,500
👉 Taxable income = THB 529,500
Step 3: Income Tax Calculation
- First 150,000 → 0% = 0
- Next 150,000 → 5% = 7,500
- Remaining 229,500 → 10% = 22,950
👉 Total annual tax = THB 30,450
👉 Monthly withholding ≈ THB 2,537.50
Step 4: Net Salary
| Item |
Amount (THB) |
| Gross Salary |
50,000.00 |
| SSO (Employee) |
(875.00) |
| Income Tax |
(2,537.50) |
| Net Salary |
46,587.50 |
Step 5: Employer Cost
| Item |
Amount (THB) |
| Gross Salary |
50,000.00 |
| SSO (Employer) |
875.00 |
| Total Employer Cost |
50,875.00 |
🇹🇭 Severance Pay in Thailand (Labour Protection Act)
Severance is a statutory obligation, not optional.
When Is Severance Required?
Required:
- Employer termination without cause
Not required:
- Voluntary resignation
- Serious misconduct (as defined under Thai law)
Thailand Severance Entitlement
| Length of Service |
Severance Pay |
| 120 days – <1 year |
30 days |
| 1 – <3 years |
90 days |
| 3 – <6 years |
180 days |
| 6 – <10 years |
240 days |
| 10 – <20 years |
300 days |
| 20+ years |
400 days |
Severance Calculation Example
Scenario:
- Salary: THB 50,000
- Service: 5 years → 180 days
Calculation:
- Daily salary ≈ 50,000 ÷ 30 = 1,667
- Severance = 1,667 × 180
👉 THB 300,060
Tax Treatment of Severance
Verified principles:
- Severance is taxable income
- Special tax computation rules may apply:
- Income spreading
- Separate calculation method
⚠️ Important:
Actual tax depends on:
- Length of service
- Type of payment
- Structuring of termination package
Employer Payroll Obligations in Thailand
Monthly:
- PND1 submission
- SSO contribution filing
Annual:
- PND1 Kor issuance
- Annual income reporting
Common Payroll Mistakes in Thailand
- Ignoring updated SSO ceiling (still using THB 15,000)
- Not deducting SSO when calculating taxable income
- Using monthly instead of annual tax logic
- Misclassifying taxable allowances
- Incorrect severance calculation
- Late statutory filings
Why Thailand Payroll Is Not “Simple”
Thailand payroll complexity comes from:
- Annualised tax system
- Deduction rules (like SSO)
- Filing-driven compliance
- High-risk termination rules
Most systems calculate salary.
Very few ensure full compliance across the lifecycle:
👉 payroll → reporting → termination
FAQ: Thailand Payroll 2026
How is salary taxed in Thailand?
Salary is taxed using progressive rates from 0% to 35%, based on annual income. Employers must withhold tax monthly through PND1 filings.
Is SSO deductible for tax in Thailand?
Yes. Employee social security contributions are deductible when calculating taxable income.
What is the SSO contribution rate in Thailand in 2026?
Both employer and employee contribute 5%, capped at THB 17,500, resulting in a maximum of THB 875 per month each.
How do you calculate net salary in Thailand?
Net salary is calculated by deducting employee SSO and income tax from gross salary, using annualised tax calculations and applicable deductions.
Is severance mandatory in Thailand?
Yes. Severance is required under the Labour Protection Act unless termination is due to resignation or serious misconduct.
How is severance calculated in Thailand?
Severance is based on last drawn salary and length of service, using statutory day-based tiers ranging from 30 to 400 days.
Final Thoughts: The Real Risk Is Not Payroll. It’s Compliance.
Thailand payroll looks simple until:
- Rules change (like SSO ceiling updates)
- Termination happens
- Tax assumptions are wrong
That’s where errors become expensive.
Payroll Is Easy. Compliance Is Where Things Break.
If your current setup:
- Relies on spreadsheets
- Uses static rules
- Cannot adapt to regulatory updates
Then you are exposed to compliance risk every month.
A system built for Asia payroll compliance ensures:
- Accurate statutory calculations
- Up-to-date rules
- Full lifecycle compliance, including termination
👉 Explore how HR Forte handles Thailand's payroll compliance