The Annual Tax Return (PND.50)
Every Thai company files PND.50 within 150 days of their fiscal year end. For calendar-year companies, that means May 31st. You report your total revenue, deductible expenses, and net taxable profit – then calculate tax at 20%.
You file even if you lost money. A loss year carries forward to offset future profits for up to 5 years.
The
Numbers
Key rates and deductions for Thai corporate income tax.
Standard Rate
20% corporate income tax on net profit for most companies.
SME Rate
Small companies (capital under 5M baht, revenue under 30M) get 0% on the first 300K and 15% on 300K–3M baht.
R&D Deduction
Qualifying research and development expenses can be deducted at 200% — effectively halving the tax on that spend.
Loss Carry-Forward
Net losses can be carried forward for up to 5 years to offset future profits.
Tax Credits That Reduce What You Owe
Three credits matter: your PND.51 mid-year prepayment gets deducted first. Then any withholding tax certificates from clients who withheld PND.53 on payments to you. Finally, taxes you paid in other countries under Double Tax Agreements.
We track all of these throughout the year so nothing gets missed at filing time.
