Weekly Recap: Corporate Tax Filing Mastered

This week we covered everything you need to know about corporate tax filing in Thailand. Here's your complete reference.

 

Key Topics Covered

Required Documents (Day 17)

• Financial statements (Balance Sheet, P&L, Cash Flow)
• Supporting documentation (invoices, receipts, contracts)
• Tax-specific documents (withholding certificates, VAT returns)
• Deduction support (training, R&D approvals)

 

Filing Process (Day 18)

8-step process:

1. Prepare financial statements
2. Calculate tax liability
3. Complete tax forms (Por Ngor Dor 50)
4. Gather supporting documents
5. Choose filing method (e-filing vs. paper)
6. Submit filing
7. Make tax payment
8. Record keeping (5 years)

 

Common Mistakes (Day 19)

Top 10 errors:

• Missing deadlines (1.5% penalty per month)
• Incorrect revenue recognition
• Claiming non-deductible expenses
• Missing withholding tax credits
• Poor BOI activity separation
• Forgetting 200% deductions
• Incorrect SME status
• Poor documentation
• Not reconciling with VAT
• DIY without expertise

 

Extension Options (Day 20)

• E-filing: Automatic extension to May 31
• Special circumstances: Rarely granted
• Payment extensions: Very difficult to obtain
• Installment plans: Alternative for payment issues

 

Working with Accountants (Day 21-22)

Services:

• Monthly bookkeeping
• Tax compliance
• Payroll
• Statutory filings

Costs:

• Small business: 8,000-12,000 THB/month
• Medium business: 12,000-20,000 THB/month
• Large business: 20,000-40,000 THB/month

ROI: Often 1,000-1,500% through tax savings and time savings

 

Critical Deadlines

| Filing Type | Deadline | |-------------|----------| | Paper filing | 150 days after year-end | | E-filing | May 31 (calendar year) | | Payment | Same as filing deadline | | BOI annual report | 90 days after year-end |

 

Filing Checklist

☐ Financial statements prepared and signed ☐ Tax liability calculated ☐ Por Ngor Dor 50 completed ☐ Supporting documents gathered ☐ Withholding tax certificates collected ☐ Deduction documentation ready ☐ E-filing account set up (if using) ☐ Payment amount confirmed ☐ Filing submitted ☐ Payment made ☐ Confirmation saved

 

Cost-Benefit of Professional Help

DIY risks:

• Compliance errors: 10,000-100,000+ THB penalties
• Missed deductions: 50,000-500,000+ THB lost savings
• Time investment: 20-40 hours/month

Professional accounting:

• Cost: 12,000-20,000 THB/month
• Benefits: Compliance + optimization + time savings
• ROI: 1,000-1,500%

 

Coming Next Week

We'll shift to Personal Income Tax:

• Who must file by March 31
• Personal tax deductions
• Online filing guide
• Common mistakes
• Final preparation for deadline

 

---

Related Service: Accounting & Tax Compliance — Professional corporate tax filing and compliance.