Direct Answer: Inward Processing Relief (IPR) is an HMRC customs special procedure that allows UK businesses to import raw materials, parts, or goods for repair, processing, or manufacturing without paying customs duty or import VAT, provided the finished products are subsequently re-exported outside the UK or cleared with proper duties.

What is Inward Processing Relief (IPR)?

Governed by the UK Taxation (Cross-border Trade) Act 2018 and HMRC customs special procedure notices, Inward Processing Relief (IPR) is designed to support UK value-added manufacturing, assembly, and repair industries. Without IPR, a UK company importing components from non-UK suppliers would pay full customs duty and VAT upon arrival, and then face double-duty barriers when exporting the finished goods to global customers.

Under IPR, customs charges are suspended at the border. If the finished goods (referred to in customs legislation as "compensating products") are re-exported from the UK, the suspended duty and import VAT are discharged completely—meaning you pay 0% UK customs duty and 0% import VAT.

Eligible Processing Operations Under IPR

HMRC permits a broad range of industrial and commercial operations under Inward Processing:

  • Manufacturing & Assembly: Combining imported electronic components, mechanical parts, or active pharmaceutical ingredients into finished commercial products.
  • Repair, Maintenance & Overhaul: Bringing machinery, aerospace parts, engines, or electronic devices into the UK for diagnostic testing, repair, or calibration and returning them to overseas owners.
  • Processing & Blending: Refining, blending, distilling, or chemical conversion of raw materials into intermediate or finished goods.
  • Repacking & Sorting: Bulk imports repackaged or sorted for international distribution outside the UK.

The Two Authorisation Routes: Full vs By Declaration

Depending on your import frequency and shipment values, HMRC offers two authorisation frameworks:

Criteria Authorisation by Declaration (Simplified) Full Standard Authorisation (SP3)
Permitted Frequency Up to 3 times per calendar year Unlimited shipments throughout validity period
Maximum Value Limit Up to £500,000 customs value per declaration Based on agreed throughput limits
Application Process Applied directly on the CDS entry at the border Prior formal application to HMRC via form SP3
Best For One-off equipment repairs or trial production batches Continuous production lines & regular exporters

Declaring Inward Processing on the Customs Declaration Service (CDS)

To enter goods into Inward Processing, your customs broker must specify precise procedure and document codes on the CDS entry:

  • Data Element 1/10 (Procedure Code): 51 00 (Requested Procedure 51: Inward Processing; Previous Procedure 00: Direct import without prior customs procedure).
  • Data Element 1/11 (Additional Procedure Code): A04 for goods imported for repair, or F44 for standard commercial inward processing.
  • Data Element 2/3 (Authorisation Document Code): For standard authorisation, cite document code C601 accompanied by your HMRC authorisation reference number (e.g., GBIPO...).

Discharging Inward Processing and Submitting Form BOD1

Goods remain legally under HMRC customs control until Inward Processing is formally "discharged". There are two primary discharge routes:

  1. Re-Export Outside the UK: The compensating products are exported under customs export procedure code 31 51 or 10 00. Duty and VAT liability is permanently extinguished.
  2. Release to UK Free Circulation: If goods are instead sold within the UK domestic market, the suspended customs duty and import VAT must be paid to HMRC. Importers can calculate duty based on the customs value of the original raw materials or the processed goods, depending on their authorisation terms.

Comparing IPR vs Customs Warehousing vs Temporary Admission

UK customs provides multiple relief mechanisms. Choose the appropriate special procedure based on your planned operations:

Customs Special Procedure Permitted Activities Ideal Use Case
Inward Processing (IPR) Substantial transformation, manufacturing, assembly, repair Manufacturing products for global re-export; machinery repairs
Customs Warehousing Storage and minimal "usual forms of handling" only Holding imported stock duty-free until sold or re-routed
Temporary Admission (TA) Total suspension without any alteration or processing Exhibition samples, professional film equipment, test items

Common IPR Compliance Pitfalls

  • Exceeding Throughput Periods: HMRC sets a strict timeframe (typically 6 to 12 months) within which imported parts must be processed and re-exported. If your production schedule slips, apply for an extension before the deadline.
  • Unaccounted Scrap or Waste: Manufacturing processes generate scrap. Your yield formula in your initial authorisation must account for expected loss ratios; otherwise, HMRC treats missing materials as diverted to the UK market.
  • Missing BOD1 Submission: Even if 100% of the imported goods were re-exported on time, failing to file BOD1 paperwork with HMRC creates an automatic customs debt.

Frequently Asked Questions About Inward Processing Relief

Inward Processing Relief (IPR) is an HMRC customs special procedure that allows UK businesses to import raw materials, parts, or goods for repair, processing, or manufacturing without paying customs duty or import VAT, provided the finished products are subsequently re-exported outside the UK or cleared with proper duties.

Qualifying activities include manufacturing, assembling components into finished goods, processing or mixing raw materials, repairing damaged items, refurbishment, overhaul, testing, and standard repackaging.

Authorisation by Declaration is a simplified route that allows eligible UK traders to use Inward Processing without holding a prior full HMRC authorisation. It can be used up to 3 times per calendar year for goods valued under £500,000, requested directly at the border on the CDS customs declaration.

A Bill of Discharge (BOD1 form) is a mandatory compliance document submitted to HMRC that accounts for all goods entered into Inward Processing. It shows the quantities imported, processed, re-exported, released into free circulation, and any production waste or scrap. It must be submitted within 30 days of the throughput period expiring.

If goods under Inward Processing are diverted into the UK domestic market instead of being re-exported, the suspended customs duty and import VAT become immediately payable to HMRC, calculated according to the customs value rules established in your authorisation.

On the Customs Declaration Service (CDS), the primary procedure code for entry into Inward Processing is 51 00 (Requested Procedure 51, Previous Procedure 00). Additional Procedure Codes such as A04 (repair) or F44 (standard processing) are also entered in Data Element 1/11.

Need HMRC Special Procedure & IPR Entry Filing?

Gxpresss UK manages complex Inward Processing declarations on CDS, verifies authorisation compliance, sets up procedure codes, and assists with discharge documentation across UK ports and airports from £45.

Request Customs Clearance Quote Explore Customs Clearance Services