泰互帮Monthly Compliance for Thai Companies: VAT Filing and Social Security
Why There Are Filing Duties Every Month
Most filing obligations of a Thai company continue even with zero revenue — nil returns must still be filed on time. Many foreign owners register a company and leave it dormant, only to discover tens of thousands of baht in accumulated fines a year or two later when applying for a work permit or renewal, along with a damaged company record.
The Monthly To-Do List
| Filing | Form | Deadline |
|---|---|---|
| VAT return | PP30 | 15th of following month (e-filing: 23rd) |
| Withholding tax on salaries | PND1 | 7th of following month (e-filing: 15th) |
| Withholding tax on payments to individuals | PND3 | same as above |
| Withholding tax on payments to companies | PND53 | same as above |
| Social security contributions | SSO filing | 15th of following month |
Monthly bookkeeping also has to happen: organizing input and output tax invoices, bank reconciliation, vouchers. Thai law requires accounts to be kept by a qualified accountant — in practice most SMEs outsource to an accounting firm.
VAT: Who Registers and How Filing Works
- Registration is mandatory above 1.8 million THB annual revenue; the rate is 7%
- Voluntary registration is possible below the threshold — and in practice usually necessary for companies sponsoring foreign work permits
- Once registered, PP30 is due every month, transaction or not — nil returns cannot be skipped
- Output tax minus input tax is the amount payable; excess input tax can be carried forward or refunded
- Tax invoices must contain the statutory elements — invoices with a wrong name or tax ID cannot be credited
Late filing incurs a fixed fine plus a monthly surcharge on unpaid tax; long-term non-filing leads to Revenue Department summons or even VAT deregistration.
Social Security: From Your First Employee
- Register with the Social Security Office (SSO) within 30 days of hiring your first employee
- Contribution: 5% employer + 5% employee, on a salary base capped at 15,000 THB — so a maximum of 750 THB each per month
- Foreign employees with work permits must also be enrolled — Immigration checks this at work visa renewal
- Enrolled staff get medical, maternity, unemployment and pension coverage, tied to a designated hospital
Half-Yearly and Annual Duties
- Half-year CIT prepayment (PND51): due within 2 months after mid-year, based on half the projected annual profit
- Annual CIT (PND50): due within 150 days after the accounting year ends
- Annual audit: all Thai companies, whatever the size, must have statements audited by a licensed auditor and filed with the DBD and Revenue Department
- Annual general meeting: within 4 months of year end, approving the financial statements
- Employees file personal tax (PND91/90) by end of March; the company issues the annual income certificate (50 Tawi)
Cost Reference
| Item | Market range (THB) |
|---|---|
| Monthly bookkeeping and filing (outsourced) | approx. 3,000-8,000/month by document volume |
| Annual audit | approx. 15,000-40,000/year by revenue scale |
| Nil-return maintenance | approx. 2,000-3,000/month |
These are common market ranges; actual quotes depend on document volume and complexity. Standard CIT is 20%, with SME relief in the lower profit bands per the Revenue Department's current rules.
FAQ
Can a company with no business skip tax filing?
No. VAT (if registered), withholding tax, annual income tax and audit duties all continue regardless of activity. Nil returns must be filed on time, or fines accumulate and complicate eventual dissolution.
Can I just abandon a company I no longer want?
Not advisable. Fines keep accruing, directors can be blacklisted, and future company registration and visas suffer. The proper route is formal liquidation, which usually takes 3-6 months.
Can the company operate if the foreign owner has no work permit?
The company can legally exist, but a foreign director actually managing operations in Thailand without a work permit is at legal risk — signing documents and running the business can be deemed "work". Get the permit sorted early.
Need Help?
TaiHuBang connects you with accounting partners for post-registration compliance: monthly bookkeeping and filing, SSO registration, annual audit and nil-return maintenance, with transparent progress reporting. See our accounting and tax service, or submit an inquiry — a consultant will reply within 24 hours.
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