Annual Filings, Accounting & Audits

At a Glance

  • Who it's for: All Thai companies and foreign businesses operating in Thailand
  • Key deadlines: March 31 (annual returns), May 31 (tax returns), ongoing monthly filings
  • Audit requirements: Companies with ≥฿30 million assets or ≥฿60 million revenue
  • Penalties: ฿5,000-฿500,000 for late filings, potential business closure for serious violations

Annual Corporate Compliance Calendar

January - March: Year-End Preparation

Financial Statement Preparation:

  • Close annual accounts by January 31
  • Prepare draft financial statements
  • Coordinate with auditors (if required)
  • Board approval of annual accounts

Tax Planning:

  • Review annual tax position
  • Prepare transfer pricing documentation
  • Plan tax-efficient profit distribution
  • Coordinate with tax advisors

March: DBD Annual Return Filing

Annual Return Deadline: March 31¹

  • Submit DBD Form Bor Mor Jor 2 (annual return)
  • File audited financial statements
  • Update shareholder and director information
  • Pay annual filing fees

April - May: Tax Return Filing

Corporate Income Tax Deadline: May 31²

  • Submit annual corporate income tax return (Por Ngor Dor 50)
  • Pay final tax liability or claim refunds
  • File transfer pricing documentation
  • Submit related party transaction disclosures

Monthly Ongoing Obligations

VAT Filing (15th of each month):

  • Submit monthly VAT return (Por Por 30)
  • Pay net VAT liability
  • Maintain VAT invoice records
  • Reconcile input and output VAT

Withholding Tax (7th of each month):

  • File withholding tax return (Por Ngor Dor 1)
  • Issue withholding tax certificates
  • Pay withheld taxes
  • Maintain payment records

Accounting Requirements and Standards

Thai Financial Reporting Standards²

Applicable Standards:

  • Thai Financial Reporting Standards (TFRS)
  • Based on International Financial Reporting Standards (IFRS)
  • Specific requirements for SMEs (TFRS for NPACs)
  • Industry-specific accounting guidelines

Key Requirements:

  • Accrual basis accounting
  • Double-entry bookkeeping system
  • Monthly trial balances
  • Annual financial statements
  • Supporting documentation retention

Mandatory Books and Records¹

Required Accounting Books:

  • General journal and general ledger
  • Cash receipts and disbursements journal
  • Sales and purchase journals
  • Accounts receivable and payable ledgers
  • Fixed asset registers
  • Inventory records

Supporting Documents:

  • Original invoices and receipts
  • Bank statements and reconciliations (business banking guide)
  • Employment and payroll records
  • Tax returns and correspondence
  • Board resolutions and meeting minutes

Digital Accounting Requirements

Electronic Records:

  • Acceptable electronic bookkeeping systems
  • Proper backup and security measures
  • Audit trail maintenance
  • Digital signature compliance
  • Data retention requirements (5 years minimum)

Audit Requirements and Process

Mandatory Audit Thresholds³

Companies Requiring Audits:

  • Total assets ≥฿30 million, OR
  • Annual revenue ≥฿60 million, OR
  • Public companies (regardless of size)
  • BOI-promoted companies
  • Financial institutions and insurance companies

Audit Exemptions:

  • Small companies below thresholds
  • Simple business structures
  • Companies with special approval from DBD

Auditor Selection and Requirements³

Qualified Auditors:

  • Licensed by Federation of Accounting Professions (FAP)
  • Independent from company management
  • Proper professional insurance coverage
  • Continuing education compliance

Audit Process:

  • Annual auditor appointment by shareholders
  • Pre-audit planning and risk assessment
  • Interim and year-end audit procedures
  • Management letter and recommendations
  • Audit opinion and financial statement certification

Audit Opinions and Implications

Types of Audit Opinions:

  • Unqualified (Clean): Financial statements fairly presented
  • Qualified: Material issues but overall fair presentation
  • Adverse: Financial statements not fairly presented
  • Disclaimer: Unable to form opinion due to limitations

Regulatory Consequences:

  • Clean opinions facilitate compliance and financing
  • Qualified opinions may trigger additional scrutiny
  • Adverse opinions can lead to regulatory sanctions
  • Disclaimer opinions may require investigation

DBD Annual Filing Requirements

Annual Return Components¹

Form Bor Mor Jor 2 Contents:

  • Company identification and registration details
  • Shareholder list with shareholding percentages
  • Director and authorized signatory information
  • Registered capital and paid-up capital status
  • Business activities and operational status

Financial Statement Filing:

  • Balance sheet as of December 31
  • Profit and loss statement for the year
  • Cash flow statement (if required)
  • Notes to financial statements
  • Auditor's report (if applicable)

Shareholder and Director Updates

Required Information:

  • Current shareholding structure
  • Changes in share ownership during the year
  • Director appointments and resignations
  • Authorized signatory updates
  • Registered office address changes

Filing Deadlines:

  • Changes must be reported within 14 days of occurrence
  • Annual confirmation by March 31
  • Penalties for late reporting: ฿1,000-฿20,000

Tax Compliance and Reporting

Corporate Income Tax Returns²

Required Disclosures:

  • Income statement reconciliation to taxable income
  • Permanent and temporary differences
  • Related party transactions summary
  • Transfer pricing documentation
  • Tax incentive and exemption claims

Supporting Schedules:

  • Depreciation and amortization schedules
  • Loss carryforward calculations
  • Investment incentive utilization
  • Foreign tax credit claims
  • Estimated tax payment reconciliation

Transfer Pricing Documentation²

Required for Related Party Transactions ≥฿20 million:

  • Master file and local file preparation
  • Economic analysis and benchmarking studies
  • Documentation of transfer pricing methods
  • Country-by-country reporting (large MNEs)
  • Annual filing with tax return

Record Retention and Documentation

Mandatory Retention Periods¹

Accounting Records: 5 years minimum

  • Books of account and supporting documents
  • Financial statements and audit reports
  • Tax returns and correspondence
  • Employment and payroll records
  • Board resolutions and corporate documents

Tax Documents: 5 years from assessment²

  • VAT invoices and input tax claims
  • Withholding tax certificates and returns
  • Transfer pricing documentation
  • Tax payment receipts and refund claims
  • Correspondence with Revenue Department

Digital Storage Requirements

Acceptable Digital Formats:

  • Scanned original documents with proper authentication
  • Electronic documents with digital signatures
  • Cloud storage with proper access controls
  • Backup and disaster recovery systems
  • Audit trail and version control

Penalties and Enforcement

Common Penalties¹

Late Filing Penalties:

  • ฿5,000 for late annual return filing
  • Daily penalties up to ฿500,000 for continued non-compliance
  • Business license suspension for persistent violations
  • Potential criminal charges for serious violations

Inadequate Record Keeping:

  • ฿2,000-฿20,000 for poor bookkeeping
  • Tax assessments based on estimated income
  • Additional penalties for tax compliance failures
  • Professional advisor liability in some cases

Enforcement Actions

DBD Enforcement:

  • Regular compliance audits and inspections
  • Document requests and interviews
  • Sanctions for non-compliance
  • Business closure for serious violations

Revenue Department Enforcement:

  • Tax audits and investigations
  • Asset seizure for unpaid taxes
  • Criminal prosecution for tax evasion
  • Professional license revocation

Best Practices for Compliance

Proactive Compliance Management

System and Process Design:

  • Robust accounting system implementation
  • Regular internal control reviews
  • Professional advisor relationships
  • Staff training and development
  • Technology automation where possible

Calendar Management:

  • Comprehensive compliance calendar
  • Early deadline preparation
  • Buffer time for complex filings
  • Professional service coordination
  • Contingency planning for delays

Professional Support

Key Advisory Relationships:

  • Qualified accounting firms
  • Licensed auditors and tax advisors
  • Legal counsel for complex issues
  • Corporate secretarial services
  • Technology solution providers

Cost-Effective Outsourcing:

  • Monthly bookkeeping services
  • Annual audit and tax return preparation
  • Compliance monitoring and calendar management
  • Professional filing and submission services
  • Training and advisory support

Sources:

  1. Department of Business Development - Annual filing requirements and corporate compliance
  2. Revenue Department - Tax compliance, audit requirements, and penalties
  3. Federation of Accounting Professions - Auditing standards and professional requirements

Legal Disclaimer: This information is a summary of official guidance from Thai government sources. In case of discrepancy, the official source prevails. Compliance requirements and deadlines change frequently—always verify current obligations on official government websites and maintain professional advisory relationships for complex compliance matters.