Guides / The SAD explained · Updated 19 October 2026

SAD (Single Administrative Document): what a SAD form is and what replaced it

The SAD, or Single Administrative Document, is the eight-copy customs declaration form introduced across the European Community in 1988 and known in the UK as the C88. Here is what a SAD form is, what each copy was for, and how electronic declarations on CDS in the UK and under the Union Customs Code in the EU have replaced it.

What is a SAD form?

The Single Administrative Document, almost always shortened to SAD, is the standard customs declaration form that was used for exports, imports and transit across the European Community and, according to the European Commission, in EFTA and some other neighbouring countries as well. In the UK the same form carries the HMRC reference C88, which is why traders use "SAD" and "C88" interchangeably. If a supplier, forwarder or accountant asks you for "the SAD", they almost always mean the customs declaration for a shipment, or the printed copy of it, rather than a particular paper form.

Today very few declarations are made on paper. The European Commission states that EU customs declarations must be made online under Article 6 of the Union Customs Code, and in the UK import and export declarations are made electronically through the Customs Declaration Service (CDS). The SAD survives mainly as a name, as a layout that some printouts still resemble, and in a few paper fallback situations described below.

Where the single administrative document came from

A Commission staff working paper on customs procedures for short sea shipping explains that a series of customs measures brought greater administrative harmonisation, leading up to 1988, when the SAD was introduced. According to the same document, it replaced over 100 forms previously used in the Member States. One form, one layout and one set of codes made it far easier for a trader in one country to understand a declaration made in another.

The Commission's note on the presentation and use of the form adds two details. The SAD is drawn up in line with the United Nations layout key, and the boxes used for transit operations generally have a green background. Because information has to show through from one sheet to the next, the forms are printed on carbonless copying paper, with certain areas desensitised so that commercially confidential details do not appear on copies where they are not wanted.

Eight copies, eight jobs

The classic SAD is a set of eight copies. The Commission describes the function of each one as follows:

Not every operation used all eight. The Commission gives the typical combinations as copies 1, 2 and 3 for export, 1, 4 and 5 for transit, and 6, 7 and 8 for import. Sets of four dual-function copies were also designed so the right combination could be printed from a computer. This is the origin of phrases you still hear, such as "copy 3" as evidence that goods were exported.

From paper to electronic declarations

Transit was the first area to leave the paper SAD behind. The same Commission working paper records that the New Computerised Transit System (NCTS) had been in use since 1 July 2003 and replaced transit declarations made on the SAD.

Under the Union Customs Code the rule is now electronic. The Commission's guidance on the customs declaration says declarations must be made online, that the details are set out in the EU Customs Data Model guidance, and that oral declarations or other acts (such as using the green channel) are allowed only in certain cases, for example for goods of a non-commercial nature. Instead of numbered boxes, the declaration is a structured set of data elements.

What replaced the C88 in the UK

In the UK, import and export declarations are made on CDS, which replaced the older CHIEF system. GOV.UK describes CDS as the service that supports making import and export declarations when moving goods into and out of the UK, and notes that anyone submitting declarations themselves needs specialist software to interact with HMRC systems.

HMRC's CDS completion instructions show how the old box-based layout has been reorganised. Data elements are grouped into eight sections:

• Group 1: message information, including procedure codes;
• Group 2: references of messages, documents, certificates and authorisations;
• Group 3: parties;
• Group 4: valuation information and taxes;
• Group 5: dates, times, periods, places, countries and regions;
• Group 6: goods identification;
• Group 7: transport information;
• Group 8: other data elements, including statistical data, guarantees and tariff-related data.

Each data element is numbered by its group, so DE 3/16 sits in the parties group. Declarations are also sorted into categories. HMRC lists, for example, H1 for release for free circulation and end use, H2 for customs warehousing, H3 for temporary admission, H4 for inward processing, and I1 for simplified import declarations. A full declaration is what the Union Customs Code calls a standard customs declaration. If you want to see how these data elements appear on a real entry, our guide to reading your CDS import declaration walks through the lines that matter.

The EU side today

On the EU side, goods coming from Great Britain are declared in the importing member state's own electronic system, under the Union Customs Code. The Commission states that the declaration may be lodged by the owner of the goods, by a person with control over them, or by a representative, and that as a rule these parties should be established in the EU. In everyday speech the resulting document is still often called "the SAD". Our separate guide on the EU customs declaration in Poland covers what that declaration holds and what to check.

What this means when someone asks for "the SAD"

• Ask which declaration they mean: the UK export entry, the UK import entry or the EU import declaration.
• Ask for the movement reference number and the accepted declaration, not a blank form.
• For VAT and accounting records, keep the official evidence the relevant tax authority expects, not just a printout from your agent.
• Do not try to fill in a paper C88 for a commercial shipment unless HMRC has invoked or agreed a fallback.

For a short explainer written for importers who meet the term on their paperwork, Easy Clearance has published the SAD form explained by Easy Clearance.

Related guides

• What your CDS declaration route number means

• Northern Ireland and the Windsor Framework: a guide for traders

• Moving dangerous goods by road between the UK and EU: ADR duties and paperwork

Sources

• The single administrative document (SAD): presentation and use of the form (European Commission)
• Guide to customs procedures for short sea shipping, SEC(2002) 632 (European Commission)
• Customs declaration (European Commission)
• CDS Declaration Completion Instructions for Imports (GOV.UK)
• Notices made under the Customs (Export) (EU Exit) Regulations 2019 (GOV.UK)

General information, not legal, tax or customs advice. Rules change; confirm current requirements on gov.uk or with a registered agent before you ship.