Corporate Income Tax Filing (PND 50/51)
Illustrative record preparation, not evidence of our staff, client records or authority approval.
ยื่นภาษีเงินได้นิติบุคคล (ภ.ง.ด.50/51) · § Advisory
What to know before you act
Start with the accounting period and applicable returns. PND50 uses full-period results; PND51 requires the interim calculation applicable to the taxpayer. The review reconciles financial statements and ledgers, records accounting-to-tax adjustments and checks withholding credits and BOI evidence before agreeing preparation, review and submission responsibilities.
Timing and external dependencies: RD guidance gives 150 days from accounting-period end for PND50 and generally two months after the first six months for PND51. Check exceptions, short accounting periods and current electronic extensions. Preparation depends on complete records and audit coordination; no completion date is guaranteed.
Official fee: Check current RD rules for any tax, surcharge, penalty or authority fee. These are separate from company service fees: Ask our team for a quotation.
Timing is not a promise of an outcome or hearing date. Check the notice, limitation period and current authority rules for your matter.
What to send for the first review
Send the accounting or tax period, filing deadline, transaction volume and work required. Separate routine filing from historical corrections and include prior returns. The free initial enquiry covers scope and quotation, not free legal advice or case analysis.
- Accounting-period dates, previous PND50/51 and payment receipts
- Financial statements, trial balance, ledgers and audit status
- Asset, depreciation, tax-adjustment and supported tax-loss schedules
Legal Basis
The Revenue Code governs net-profit taxation and corporate returns. PND50 uses full-period results; PND51 is an interim return with calculation rules and exceptions depending on the taxpayer. Accounting profit is not automatically taxable profit, and SME treatment does not apply to every entity. Check capital, revenue, disallowed expenses and actual exemption eligibility.
📚 Official sources — check the current law and procedure before acting
Who Needs This
Companies and juristic partnerships preparing tax returns, inactive registered businesses checking remaining duties, and BOI entities separating promoted and non-promoted activities.
Required Documents
- Accounting-period dates, previous PND50/51 and payment receipts
- Financial statements, trial balance, ledgers and audit status
- Asset, depreciation, tax-adjustment and supported tax-loss schedules
- Withholding certificates and BOI evidence if relevant
- Related-party records and previous disclosure forms if applicable
Common Pitfalls
- Using an accounting loss as a tax loss without reconciliation
- Duplicating credits or using certificates for the wrong entity or period
- Assuming BOI tax relief removes filing duties
- Leaving audit coordination until the filing deadline approaches
Document-review situations (not client histories)
- Closing accounts with accounting-to-tax differences
- An inactive entity checking continuing filing duties
- A BOI entity separating income and costs before claiming relief
FAQ
- Do PND50 and PND51 use identical figures?
- No. PND50 uses full-period results. PND51 generally uses an estimate, but some taxpayer categories use actual first-six-month profit. Confirm the taxpayer type before calculating.
- Does no revenue or a loss remove filing duties?
- For a Thai company still subject to corporate filing duties, neither no revenue nor a loss automatically removes PND50 obligations. Check status and the accounting period with RD.
- Does every company submit a Disclosure Form?
- No. Check statutory relationships, the revenue criterion and exemptions. Related-party disclosure is not mandatory for every PND50 filer.
- What is needed for a quotation?
- Send accounting-period dates, prior returns, a trial balance, transaction scope, audit status and BOI details if relevant. The free initial enquiry is for scope and quotation, not free legal analysis.
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Official sources — company registration & BOI
The information on this page follows the official sources below. Always check the latest version before you file.
- Department of Business Development — company registration— Department of Business Development
- Board of Investment (BOI) / LTR Visa— Thailand Board of Investment
- Revenue Department — Revenue Code, income tax, VAT— Revenue Department
- PDPC Thailand— PDPC Thailand
- Office of the Council of State — Thai law database— Office of the Council of State
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Frequently asked questions
- Can a foreigner own 100% of a Thai company?
- Full foreign ownership is possible for some activities, but there is no blanket permission. Check the Foreign Business Act definition, actual activities, sector-specific restrictions and any required licence or certificate. BOI promotion and treaty rights apply only within their approved scope; they do not automatically confer land rights, visas or work permits. Do not use nominee shareholders. Verify the proposed structure with DBD.
- What is the minimum registered capital for a Thai company?
- Do not apply one capital figure to every incorporation, foreign-business licence, visa or work-permit application. Registered capital and paid-up capital are different, and the applicable requirements depend on actual activities, ownership, permit category and any BOI or treaty conditions. Capital is a company funding requirement, not our service fee. Confirm the relevant criteria with DBD, the Department of Employment and Immigration before choosing the structure. Ask our team for a quotation for the agreed work.
- How long does company registration take?
- Separate document preparation, name reservation, signatures and DBD review from VAT registration, Social Security and bank onboarding. Timing depends on the filing channel, complete documents and any requests for corrections or additional evidence; no completion date is guaranteed. Ask our team for a quotation and a planning estimate after the proposed structure and documents have been reviewed.
- What ongoing accounting obligations does a Thai company have?
- A Thai limited company keeps statutory books and prepares audited annual statements even without trading. Tax returns depend on its payments, VAT status, accounting period and taxpayer category: PND1, PND3 and PND53 are not universal monthly returns for every company, and PP30 applies to VAT-registered businesses, including nil-return months while registration remains active. Check PND50, PND51 and each filing deadline with RD; check annual statements and shareholder filings separately with DBD.