Import and Export Declarations and Customs Documents
Import and export declarations cleared under the Customs Act B.E. 2560 (2017) evidence that goods were imported or exported, supporting tax claims, insurance, trade disputes and checks by foreign authorities.
Thai customs clearance is largely electronic, so a declaration exists as data in the Customs Department's system. Where the recipient needs verifiable evidence, request an agency-certified copy rather than a self-printed page.
Supporting documents commonly requested alongside are the commercial invoice, packing list, bill of lading or air waybill, and certificate of origin. Numbers, dates and item descriptions must reconcile across the set, or the recipient will query it immediately.
In trade disputes and insurance claims, the recipient wants proof the goods actually left Thailand on the stated date. A cleared export declaration carries more weight than documents the exporter prepared itself.
For duty refunds or tax privileges, check that the tariff classification and declared value match the commercial documents; discrepancies lead to explanations and delay.
Documents to prepare
- The cleared import or export declaration with its declaration number
- An agency-certified copy where the recipient requires official evidence
- Commercial invoice and packing list for the same consignment
- Bill of lading or air waybill
- Certificate of origin, where preferential tariff treatment is claimed
- Company affidavit of the importer or exporter, plus a power of attorney where a customs broker acts
Step order
- Identify the declaration number and clearance date to be evidenced
- Request an agency-certified copy through the Customs Department's designated channel
- Reconcile numbers, dates and item descriptions across every commercial document in the set
- Have the papers translated by a translator who signs and takes responsibility, where Thai is not accepted
- File for legalisation at the Department of Consular Affairs where required
- Legalise at the destination embassy or consulate, or obtain an apostille once the Convention is in force
Pre-filing checklist
- The declaration number and clearance date are correct
- Items and values reconcile with the invoice and transport document
- The importer or exporter name matches the company affidavit
- The copy is agency-certified rather than self-printed
- You know whether the recipient wants the declaration alone or the full commercial set
Practical tips
- File each commercial set by declaration number on the clearance date so it can be produced instantly in a dispute
- Where a broker is used, always obtain the full document set, not just the service invoice
- Check tariff classification with an adviser before declaring; post-clearance amendment is harder
- Ask the foreign recipient what level of certification is needed before filing, to avoid repeat submissions
Common pitfalls
- Sending a self-printed page when the recipient requires an agency-certified copy
- Item descriptions that do not match the commercial invoice, casting doubt on the whole set
- Not retaining the broker's documents, leaving no evidence when a dispute arises later
- Treating a declaration as a substitute for a certificate of origin, which serves a different purpose
Frequently asked questions
What is a customs declaration?
The statement of imported or exported goods lodged with the Customs Department under the Customs Act B.E. 2560 (2017). Once cleared, it evidences the import or export.
Is a self-printed copy acceptable as evidence?
It is fine internally, but where verifiable evidence is required, request an agency-certified copy, since a self-printed page carries no official certification.
What supporting documents are needed?
Typically the commercial invoice, packing list, transport document and, where preferential tariffs are claimed, a certificate of origin. All must reconcile with each other.
Can it be used in litigation or insurance claims?
Yes, and it usually outweighs documents prepared by a party, because it was lodged with a state agency. Use an agency-certified copy as the exhibit.
Can the customs broker keep the documents instead?
In practice yes, but the importer or exporter should retain a full set, since it bears legal responsibility and will need the documents in any dispute.
How are they translated and certified for use abroad?
A translator who signs and takes responsibility prepares the translation, then it goes through consular legalisation and destination embassy attestation, or an apostille once the Convention applies to both countries.
For a document review before you file, contact us on LINE @nycli, call +66-83-249-4999 or email nycli@ilc.ltd. Our team will confirm the steps, any missing documents and a realistic timeline for your case.
Related cases
- Certificate of Residence for Tax Purposes
- Income Tax Returns (PND 90/91 and PND 50)
- Withholding Tax Certificate (Section 50 bis)
- VAT Registration Certificate (PP 20) and VAT Documents
- Tax Clearance Certificate and Certificate of Payment of Tax
Official references
Requirements on this page follow the rules published by the authorities below. Always confirm the latest notice on the official site before filing.
- The Revenue Department
- Thai Customs Department
- Department of Consular Affairs, MFA ThailandThailand's authority for document legalization and Apostille
- HCCH — Apostille Section (Hague Convention 1961)Thailand's accession enters into force 28 February 2027
Related services
Fees depend on document type, number of pages and turnaround. Send scans to LINE @nycli, call +66-83-249-4999 or email nycli@ilc.ltd for a written quotation.