IM4 Customs Document Meaning: Release for Free Circulation
Quick answer
IM4 on an import document means the goods were declared for release for free circulation — the standard, definitive import into the EU, with import duty and import VAT payable. The “IM” marks a customs declaration for trade with non-EU countries, and the “4” is the leading digit of the requested customs procedure (40 00, release for free circulation). IM4 is not a special procedure: inward processing appears as IM5, customs warehousing as IM7.
DAsk the AI Customs Broker — free, no sign-up to try.Key takeaways
- IM4 identifies a customs declaration for release for free circulation — the normal, definitive import procedure (code 40 00), with import duty and VAT payable [1].
- For SPECIAL procedures such as inward processing (declared as IM5), the INF information-sheet number uniquely identifies the procedure and facilitates standardized data exchange between customs authorities [2][3].
- The digit after “IM” follows the requested-procedure code: 4 = release for free circulation, 5 = inward processing or temporary admission, 6 = re-importation, 7 = customs warehousing [1:1].
- Businesses must provide detailed data elements on goods, including commodity codes, quantities, values, and authorisation numbers, to remain compliant [2:1][4].
- The supervising customs office is responsible for managing INF data and providing relevant information for customs declarations under inward processing [2:2].
- Other IM codes exist for different customs procedures, and understanding their meanings is vital for correct customs declarations [1:2].
- Compliance requires accurate documentation, timely declarations, and adherence to deadlines for discharge and re-importation under inward processing [2:3][5].
Understanding IM Codes on EU Import Documents
In the European Union customs framework, import documents include codes that identify the special customs procedures applied to goods. These codes, known as IM codes, are integral to customs declarations and indicate how goods are treated under EU customs law. The IM codes help customs authorities quickly identify the procedure under which goods are placed, such as inward processing, outward processing, or other special regimes.
On the declaration itself, the type appears in Box 1 as “IM” plus a letter (IM A for a standard declaration, IM D for one lodged before the goods arrive), and the requested procedure appears as a four-digit code in Box 37 — 40 00 for release for free circulation, 51 00 for inward processing, 71 00 for customs warehousing [1:3]. The shorthand “IM4”, “IM5” or “IM7” seen on courier letters and import paperwork combines the declaration type with that procedure’s leading digit.
Understanding these codes is critical for EU businesses importing goods, as they directly affect customs duties, documentation requirements, and compliance obligations. The IM codes must be correctly declared in the customs declaration to ensure proper processing and to benefit from any duty suspensions or suspensions granted under special procedures.
What IM4 Signifies: Release for Free Circulation
The IM4 import document identifies goods declared for release for free circulation (procedure 40 00) — the standard way goods from outside the EU definitively enter the single market. Customs duty and import VAT are assessed and paid, and the goods obtain Union status: they can then move and be sold anywhere in the EU without further customs formalities [1:4].
In practice, IM4 on a courier letter or customs notice simply means a normal import declaration was (or must be) lodged for your consignment. The declarant — the importer or a customs representative acting for them — is responsible for the accuracy of the declared commodity code, customs value and origin, which together determine the duty owed.
If you expected your goods to enter under a duty-suspending arrangement instead, check the code: inward processing or temporary admission shows as IM5 (procedures 51/53), and customs warehousing as IM7 (procedure 71). Those SPECIAL procedures — not IM4 — are the ones that require prior authorisation, INF information sheets and discharge deadlines [2:4].
The Role of the Information Sheet (INF) in Special Procedures
The Information Sheet (INF) is a standardized document used in the EU customs system to facilitate the exchange of data between customs authorities regarding goods under special procedures such as inward processing. The INF number is a unique identifier assigned by the supervising customs office to each inward processing authorisation or declaration [2:5].
The INF serves multiple purposes:
- It consolidates key data elements about the goods, including commodity codes, quantities, values, and authorisation numbers [2:6].
- It enables the supervising customs office to share relevant information electronically with other customs authorities involved in the procedure, ensuring transparency and coordination [2:7][3:1].
- It supports the calculation and notification of customs duties when goods are re-imported or discharged from the procedure [3:2].
The INF number must be referenced in customs declarations related to inward processing. It ensures that all customs offices involved have access to consistent and accurate information, which is critical for compliance and duty calculation.
Key Data Elements for Inward Processing (IM/EX) Declarations
When declaring goods for inward processing (IM5, also noted IM/EX), businesses must provide specific data elements to the customs authorities. These data elements are mandatory to ensure proper identification, control, and processing of the goods under the special procedure [2:8][4:1].
Key data elements include:
- Authorisation number: The unique number of the inward processing authorisation granted by the supervising customs office [2:9].
- EORI number: The Economic Operators Registration and Identification number of the declarant or authorisation holder [2:10].
- INF number: The unique identifier for the information sheet related to the inward processing procedure [2:11][3:3].
- Commodity code (CN code): The Combined Nomenclature code classifying the goods [2:12][4:2].
- Net quantity and value: The quantity and value of goods placed under inward processing and the processed products [2:13][4:3].
- Description of goods: Detailed description of the goods covered by the inward processing procedure [2:14].
- Customs office codes: Identification of the supervising customs office and other relevant offices using COL codes [2:15][3:4].
- Dates: Important dates such as date of placement, discharge, exit, and re-importation [5:1][4:4].
Providing these data elements accurately is essential for customs authorities to assess the procedure, monitor compliance, and calculate any customs debt if applicable.
Other IM Codes and Their Meanings
Besides IM4, the EU customs system uses various IM codes to denote different customs procedures or document types. Each code helps to identify the nature of the customs declaration or the special regime applied to the goods.
For example:
- IM5: inward processing or temporary admission — non-Union goods enter under duty suspension for processing, repair or temporary use (procedures 51/53) [2:16].
- IM6: re-importation — returned goods re-entering free circulation (procedure 61) [1:5].
- IM7: customs warehousing — storage under duty suspension until a next procedure (procedure 71) [1:6].
- IM9: other procedures outside the standard list [1:7].
- Separately, customs paperwork carries document-type codes for ATTACHED documents — delivery notes (270), commercial invoices (380), customs transit declarations (820–822) [1:8]. These identify paperwork, not procedures.
Understanding the meaning of these codes is important for businesses to ensure that declarations are correctly filed and that customs authorities can process the goods under the appropriate regime.
Who is Affected by IM Codes and Special Procedures
IM codes affect every business importing into the EU single market: IM4 (release for free circulation) is the default for definitive imports, while IM5/IM7 mark special procedures. Those most exposed include:
- Manufacturers and processors who import non-Union goods for processing or repair within the EU.
- Importers and exporters who must declare goods under inward or outward processing procedures.
- Customs brokers and compliance teams responsible for preparing and submitting customs declarations.
- Authorised economic operators who may benefit from simplified procedures but must still comply with documentation requirements.
The use of IM codes is mandatory in customs declarations where special procedures apply. Failure to correctly use these codes can result in customs delays, incorrect duty payments, or non-compliance penalties.
Compliance Obligations for Businesses Using IM Codes
To comply with EU customs regulations when using special-procedure IM codes such as IM5, businesses must:
- Obtain the necessary authorisations for inward processing from the supervising customs office.
- Ensure that the customs declaration includes the correct IM code and all mandatory data elements, including the INF number and authorisation number [2:17][4:5].
- Maintain accurate records of goods placed under inward processing, including quantities, values, and processing details.
- Submit timely customs declarations for placement, discharge, and re-importation of goods under the procedure [5:2].
- Cooperate with customs authorities during audits or controls related to the special procedure.
- Use the electronic systems provided by the supervising customs office to access or request INF data elements where applicable [2:18].
Adhering to these obligations helps businesses benefit from duty suspensions and avoid customs penalties.
Next steps
- Check which IM code your import documents show: IM4 means a definitive import with duty and VAT due; IM5 or IM/EX means inward processing applies.
- Confirm the authorisation number and INF number with the supervising customs office before submitting customs declarations.
- Prepare customs declarations with complete and accurate data elements, including commodity codes, quantities, and values.
- Monitor deadlines for discharge and re-importation under inward processing to maintain compliance.
- Coordinate with your customs broker or compliance team to ensure correct use of IM codes and proper documentation.
FAQ
What is the IM4 customs document?
The IM4 customs document is an EU import declaration for release for free circulation: the goods definitively enter the EU market and customs duty plus import VAT become payable (procedure code 40 00) [1:9].
What is an import document?
An import document is a customs declaration or related paperwork submitted to customs authorities to declare goods entering the EU, specifying details such as commodity codes, origin, value, and applicable customs procedures [1:10].
What does the IM7 customs document mean?
IM7 marks goods entered into customs warehousing (procedure 71): they are stored under duty suspension, and duty is paid only if and when they are later released for free circulation [1:11].
What does IM4 mean?
IM4 on a customs letter or import document means your goods were declared for release for free circulation — a normal, definitive import with duty and VAT due. A special procedure such as inward processing would show IM5 instead [1:12].
How do I declare goods under inward processing in the EU?
Goods under inward processing are declared with an IM5 declaration (procedure 51 00, noted IM/EX), including the authorisation number, INF number, commodity codes, quantities, and values submitted to the supervising customs office [2:19][4:6].
What is an INF number in EU customs?
The INF number is a unique identifier assigned by the supervising customs office to an information sheet related to a special customs procedure such as inward processing. It facilitates standardized exchange of information between customs authorities [2:20][3:5].
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