How the SAD Document Works

How to prepare the process and the documents

The SAD document, the Single Administrative Document, is the customs declaration form used for imports, exports and transit of goods . The Union Customs Code requires electronic declarations (Article 6 UCC), so in Poland SAD-layout data is submitted in PUESC, and in the United Kingdom in the Customs Declaration Service (CDS), which all businesses have had to use since 30 March 2024 (GOV.UK). Among other things, it carries the parties' details, EORI numbers, a description of the goods with the HS code, the customs value, and the customs procedure applied. The accuracy of the data in the SAD/CDS determines whether the goods are released without delay or sent for further verification.

Split of responsibilities between the parties

The person who signs the customs declaration is responsible for the accuracy and completeness of the information, the authenticity of the documents and compliance with the obligations of the procedure (Article 15(2) UCC). The importer or exporter supplies the commercial data, and the customs agent files the declaration as representative. The agent's liability depends on the form of representation - indirect or direct - covered in direct and indirect customs representative.

Minimum data set for the declaration

In the classic SAD form layout (the box numbers refer to the SAD form; in PUESC and CDS the same information is submitted as declaration data fields with different numbering) the most important data are:

• consignor/exporter (box 2), consignee (box 8) and declarant (box 14), with EORI numbers - see how to get an EORI number,
• country of dispatch (box 15) and delivery terms, Incoterms (box 20),
• description of the goods (box 31) and commodity code CN/HS (box 33) - see HS codes,
• country of origin (box 34), gross and net mass (boxes 35 and 38),
• customs procedure (box 37) and invoice value (box 22) - see customs value of goods,
• documents attached to the declaration, e.g. invoice, consignment note, proof of origin (box 44).

Find out more about the services of the UK customs agency.

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How the declaration and inspection work

Filing a customs declaration in the PUESC system triggers a sequence of automated checks — from the classification of the goods, through the customs value, to confirmation that the relevant declarations have been filed. For clearance to run smoothly, every stage should be planned in advance and documented by the person responsible for compliance in the company.

Operational stages from pre-notification to release

1. Prepare data and documents that are consistent with each other (invoice, consignment note, packing list).
2. File the declaration in PUESC (in the UK, in CDS); the system assigns an MRN.
3. Automated verification and, where necessary, a document or physical check.
4. Payment of duty and VAT and release of the goods to the procedure.

The most common risk points and how to limit them

The usual failure points are: a wrong CN code, a value inconsistent with the invoice and delivery terms, no proof of origin when a preference is claimed (EUR.1 is not used in EU-UK trade - a statement on origin is), and inconsistent party data or EORI numbers. Before filing, compare the invoice, consignment note and packing list. The consequences of errors in Poland and the UK are covered in customs penalties for businesses.

How to maintain compliance and settlements

Record-keeping, corrections and evidence of due diligence

Under Article 51 of the Union Customs Code, documents and information relating to a declaration (including declarations, invoices and transport documents) must be kept for customs control purposes for at least 3 years, generally counted from the end of the year in which the declaration was accepted; tax rules may require a longer period. Amending an accepted declaration is governed by Article 173 UCC: on the declarant's application it is possible before release (unless customs have announced an examination or found the particulars incorrect) and, after release, within 3 years of acceptance of the declaration. Invalidation of a declaration is a separate mechanism (Article 174 UCC). Complete evidence of due diligence is the foundation of an effective defence during a customs and tax inspection.

Working with a customs agency and internal audit

Working with an experienced customs agency gives you access to up-to-date knowledge of regulatory changes, correct classification of the goods, and a swift response if clearance is held up. It is also worth carrying out regular internal customs reviews: checking the accuracy of CN codes, the status of declarations in PUESC, and the consistency of data between the commercial documents and the customs declarations helps catch errors before they become the subject of an external tax inspection.

Frequently asked questions