Thailand Company Annual Compliance Requirements (2026): Revenue Department, DBD, Social Security and BOI

Thailand Company Compliance Guide for Indian Entrepreneurs (2026)

Thailand company annual compliance requirements come from four bodies. The Revenue Department wants a half-year tax return (PND 51) and an annual return (PND 50) within 150 days of year-end, plus monthly VAT and withholding returns. The DBD wants audited financial statements, the Social Security Office monthly contributions, and the BOI annual reports if your project is promoted. Our Thailand company formation page covers setup.

Thailand has a structured but strict regulatory system involving multiple authorities:

• Revenue Department (tax authority)
  
• Department of Business Development (DBD)
  
• Social Security Office (SSO)
  
• Board of Investment (BOI) for promoted companies

Each authority has its own filing requirements, deadlines, and penalties.

Missing even one filing can result in:

• Financial penalties
  
• License suspension
  
• Visa/work permit issues
  
• Audit triggers

This guide explains all key compliance obligations for Thailand companies in 2026.

Key Regulatory Authorities in Thailand

1. Revenue Department (RD)

Responsible for:

• Corporate income tax
  
• VAT filings
  
• Withholding tax
  
• Personal income tax reporting

2. DBD (Department of Business Development)

Responsible for:

• Company registration
  
• Annual financial statements
  
• Shareholder updates
  
• Corporate governance filings

3. Social Security Office (SSO)

Responsible for:

• Employee social security contributions
  
• Monthly payroll compliance
  
• Employer obligations

4. BOI (Board of Investment)

Responsible for:

• Investment approvals
  
• Incentive monitoring
  
• Annual reporting for promoted companies

Annual Corporate Income Tax Return PND 50

What is PND 50?

PND 50 is Thailand’s annual corporate income tax return.

It is mandatory for all registered companies.

Filing Deadline:

Within 150 days after financial year-end

What it includes:

• Total revenue
  
• Deductible expenses
  
• Net profit calculation
  
• Corporate tax payable
  
• Financial statements summary

Who must file?

• All Thai companies (Co Ltd)
  
• Foreign-owned companies
  
• BOI and non-BOI entities

Penalties for late filing:

• Monetary fines
  
• Interest on unpaid taxes
  
• Potential audit trigger

Half-Year Tax Return PND 51

What is PND 51?

PND 51 is a mid-year estimated corporate tax return.

Filing Deadline:

Within 2 months after first 6 months of fiscal year

Purpose

• Estimate annual profit
• Pay advance corporate tax
• Reduce year-end tax burden surprises

Important Note

Many foreign founders overlook PND 51, but it is mandatory for most companies.

VAT Filing PP30 (Monthly)

What is PP30?

PP30 is the monthly VAT return in Thailand.

VAT Rate:

7% until 30 September 2027 (statutory rate 10%). Registration is compulsory once taxable revenue passes THB 1.8 million a year.

Filing Frequency:

Monthly

Requirements:

• Sales invoices
• Purchase invoices
• Input VAT tracking
• Output VAT calculation

Key Compliance Rule:

Even if no revenue is generated, zero filings may still be required depending on registration status.

Penalties:

• Late filing fines
• VAT penalties
• Interest charges

Withholding Tax (WHT) Compliance

Companies must deduct and remit withholding tax on certain payments:

• Employee salaries
• Contractor payments
• Service fees
• Royalties
• Interest payments

Reporting Requirement:

WHT must be reported monthly through Revenue Department filings.

DBD Annual Financial Statements

All companies must submit annual audited financial statements to:

Department of Business Development (DBD)

Filing Deadline:

Within 5 months after financial year-end: the audited accounts are approved at the annual general meeting and then filed with the DBD, together with the shareholder list.

Required Documents

• Audited balance sheet
  
• Profit & loss statement
  
• Auditor report
  
• Shareholder information summary

Important

Audited financial statements are mandatory even for small companies.

Audit Requirement in Thailand

Most companies must undergo:

Annual statutory audit

Conducted by licensed Thai auditors.

Why audits matter:

• Required for DBD filing
  
• Required for tax filings
  
• Required for BOI compliance (if applicable)
  
• Required for bank account maintenance

Social Security Compliance (SSO)

If you hire employees in Thailand, you must register with the Social Security Office.

Employer Contribution:

~5% of employee salary

Employee Contribution:

Also required (deducted from salary)

Monthly Requirements:

• Employee salary reporting
  
• Contribution payment
  
• Workforce updates

Penalties

• Fines for late payment
  
• Legal liability for non-compliance

BOI Compliance Requirements (If Promoted)

BOI companies have additional obligations.

Annual BOI Reporting Includes:

• Investment progress
  
• Employment numbers
  
• Machinery imports
  
• Revenue breakdown
  
• Project status updates

BOI Monitoring Focus:

• Job creation
• Capital investment compliance
• Industry alignment
• Operational activity

Risk of Non-Compliance:

• Loss of tax incentives
• Revocation of BOI status
• Requirement to repay benefits

Work Permit Reporting Obligations

Foreign employees and directors must comply with:

• Work permit validity checks
  
• Address reporting
  
• Role compliance updates

Important Rule:

Work permits are tied to:

• Company compliance status
  
• Registered capital
  
• Employee ratios (in some cases)

Penalties for Non-Compliance in Thailand

Thailand enforces penalties for late or missing filings. Late payment of tax carries a surcharge of 1.5% a month on the unpaid amount, a late annual return can bring a fine of up to THB 2,000, and underestimating half-year profit by more than 25% can add a 20% surcharge on the PND 51 tax. Late DBD filings carry fines for the company and its directors.

Common Penalties:

Late Tax Filing

• Fixed fines
  
• Interest on unpaid tax

VAT Non-Compliance

• Additional penalties
  
• Audit risk

DBD Filing Delay

• Company status warnings
  
• Legal penalties

Social Security Violations

• Fines per employee
  
• Employer liability

BOI Violations

• Loss of privileges
  
• Tax incentive withdrawal

Common Compliance Mistakes by Foreign Founders

Many Indian entrepreneurs face issues due to:

• Missing PND 51 filings
  
• Ignoring VAT registration thresholds
  
• Not hiring certified auditors
  
• Improper bookkeeping
  
• Assuming BOI removes all obligations
  
• Late social security registration
  
• Weak document retention practices

Compliance Calendar Overview (Annual Cycle)

Monthly

• VAT return (PP30)
  
• Social security payments
  
• Withholding tax filings

Half-Year

• PND 51 tax return

Annual

• PND 50 tax return (150 days)
  
• DBD audited financial statements (5 months)
  
• BOI annual report (if applicable)
  
• Statutory audit completion

BOI vs Non-BOI Compliance Load

Why Compliance Matters for Foreign Investors

Thailand is business-friendly but enforcement is strict.

Compliance is essential for:

• Maintaining visas and work permits
  
• Protecting BOI incentives
  
• Avoiding financial penalties
  
• Ensuring banking stability
  
• Maintaining legal status

Final Thoughts

Thailand works well for Indian entrepreneurs who keep their filings on time.

The system is structured around multiple authorities, each with strict deadlines:

• Revenue Department (tax compliance)
  
• DBD (corporate filings)
  
• Social Security Office (employment compliance)
  
• BOI (investment monitoring)

For foreign founders, missed filings after incorporation cause more trouble than incorporation itself.

A well-managed compliance system ensures:

• Smooth operations
  
• Tax efficiency
  
• Visa stability
  
• BOI incentive protection
  
• Long-term business continuity

What you file in India for your Thai company

Your Thai company is Overseas Direct Investment (ODI) under FEMA. Your AD Category-I bank reports it on Form FC and obtains a UIN before any capital leaves India. After that you file the Annual Performance Report (APR) by 31 December each year, and the FLA return to RBI by 15 July if an Indian company or LLP is the investor. A resident individual who holds the shares personally files the APR but not the FLA return, and remits capital within the Liberalised Remittance Scheme limit of USD 250,000 per financial year. Keep the Thai audited accounts ready in time: the APR is based on them, so a late Thai audit makes the India filing late too.

Frequently asked questions