Thai Company Tax Filing Guide: VAT and Corporate Income Tax Deadlines

Which Taxes Does a Thai Company Pay?

Operating a Thai limited company involves four main tax types:

• Value Added Tax (VAT): standard rate 7%; registration is mandatory above 1.8 million THB annual revenue
• Withholding Tax: deducted when paying service fees, rent, salaries and more, at rates from 1% to 5%
• Corporate Income Tax (CIT): standard rate 20%; SMEs with registered capital up to 5 million THB and revenue up to 30 million THB get progressive relief (profit under 300,000 THB is exempt)
• Personal Income Tax (PIT): employee salaries taxed progressively 0%-35%, withheld monthly by the company

Monthly Filings

Form	Content	Deadline
PP30	VAT return	15th of the following month
PND1	Withholding tax on salaries	7th of the following month
PND3 / PND53	Withholding tax on payments to individuals / companies	7th of the following month
SSO	Social security (5% employer + 5% employee)	15th of the following month

E-filing via the Revenue Department system usually extends deadlines by 8 days. Note: once VAT-registered, PP30 must be filed every month even with zero revenue — missed filings accumulate fines.

Annual Filings

• PND51: mid-year CIT prepayment, due within 2 months after the first half of the accounting year
• PND50: annual CIT return, due within 150 days after the accounting year ends
• Annual audit: every registered Thai company, regardless of size, must submit financial statements audited by a licensed auditor to the DBD
• Annual employee tax summary (PND1 Kor): by end of February

Consequences of Late or Missed Filing

• Late filing fines: 100-2,000 THB per form
• Tax surcharge: 1.5% interest per month on unpaid tax
• Prolonged non-filing: the Revenue Department can assess tax by estimate and flag the company
• Knock-on effects: directors' work visa renewals, corporate bank accounts and BOI status can all be affected

Traps Foreign Owners Commonly Fall Into

1. Assuming no business means no filing — then facing two years of accumulated VAT and blank-account fines
2. Mixing personal and company accounts, leaving fund flows unexplainable at audit
3. Forgetting to withhold tax on rent and service payments, making costs non-deductible
4. Keeping books only in the home country with no Thai ledgers, then paying double for a rushed catch-up before audit
5. Negotiating salaries "net in hand" while overlooking social security and PIT costs

FAQ

Can a company with zero revenue skip the audit?

No. Thai law requires all limited companies to submit audited financial statements annually, zero revenue included — the audit fee is simply lower.

Do the books have to be in Thai?

Official ledgers and filings are in Thai; day-to-day documents can be organized bilingually. This is why most foreign-owned SMEs outsource to a local accounting firm.

Do I personally need to file Thai income tax?

Staying in Thailand 180 days or more in a calendar year makes you a Thai tax resident. Thai-sourced income is always taxable, and since 2024 foreign income remitted into Thailand also falls within scope — check the Revenue Department's latest rules and plan ahead.

Need Help?

TaiHuBang works with licensed Thai accounting firms offering monthly bookkeeping and filing, annual audit, tax health checks and catch-up bookkeeping. See our accounting and tax service, or submit an inquiry describing your company for a quote and compliance advice.