Outward Processing: Pay Duty Only on What Was Added Abroad

The same steel, taxed twice

A machine shop in Ohio fabricates 12,000 lb of precision components, ships them to a contract assembler in Vietnam, and brings the finished units back sixty days later. The entry is filed at the full value of the returned goods. The US-made components inside them — already domestic, already paid for — are taxed as if they had been bought overseas.

Nothing about that entry is illegal. It is simply the expensive way to file it. Every major customs system has a mechanism for the opposite outcome: outward processing, the principle that goods sent abroad temporarily for repair, alteration or assembly should be taxed on their return only on the value added outside the territory.

The mechanism is old, well documented, and consistently underused, because it sits in a corner of the tariff most importers never open — and because claiming it depends on paperwork created at export, months before anyone thinks about duty.

The US toolkit sits in Chapter 98

The United States has no single standing procedure for this. It has a set of tariff provisions in Chapter 98 of the HTSUS, each with its own conditions.

Two conditions do most of the damage in practice. Under 9802.00.80, components must leave ready for assembly and must not be advanced in value abroad other than by being assembled — a component that is machined, painted or heat-treated overseas usually falls out. And under 9802.00.50, the work must remain a repair or alteration: if the operation creates a commercially different article, the provision is unavailable and the full value is dutiable.

The European Union takes the opposite architectural approach, worth knowing if you file on both sides of the Atlantic. The relief there is a single authorised procedure rather than a set of tariff headings: the Union Customs Code covers it in articles 259 to 262, the duty base is defined as the cost of the processing operation carried out outside the territory, and free-of-charge warranty repairs carry total relief. The practical difference for a multinational is timing — the EU wants an authorisation before departure, the US wants evidence at return.

The claim is built at export, not at entry

Every version of this relief rests on one factual question a customs officer must be able to answer years later: are the goods coming back the goods that left? Nothing in the entry filed on return can answer it retroactively.

What answers it is a short list of records created before departure. Serial numbers, asset tags or lot numbers written onto the export declaration rather than onto an internal packing note. A description precise enough that a third party could match it — "hydraulic pump, model and serial" rather than "spare part". Photographs attached to the file where marking is impractical. And, for assembly programmes, a schedule of the components exported, tied to the assembler’s later declaration of what was used.

Where that file exists, the claim is routine. Where it does not, the importer is asking customs to accept a commercial narrative in place of evidence, and the result is predictable: the entry is filed at full value and the difference is never recovered. This is also why the relief tends to be claimed reliably by companies with an established trade-compliance function and missed almost entirely by everyone else — the obstacle is process, not law.

Two entries, one shipment

Offshore assembly of US components

The $10,920 difference is per shipment, not per year. On a monthly programme it clears six figures — and it is entirely a function of whether the assembler’s declaration and the component export records were prepared correctly, not of anything that happens at the port.

Equipment repaired in Germany

Note what makes the second entry possible: a serial number recorded on the export documentation. Without it, customs cannot establish that the returning machine is the machine that left, and the claim collapses regardless of how convincing the repair invoice looks. The same discipline underpins any US import programme that relies on documentary evidence rather than physical inspection.

The UK and India take different routes

The United Kingdom retained a procedural model after Brexit: Outward Processing Relief requires an authorisation from HMRC before the goods leave, sets a period for re-import, and taxes the value added abroad. Repairs carried out free of charge under warranty attract relief in full. Because the authorisation is prior, a UK exporter who ships first and asks later is normally out of the scheme for that consignment.

India works through re-import notifications rather than a standing procedure. Goods exported for repairs, reconditioning or re-processing and brought back are typically assessed on the fair cost of repairs plus insurance and freight both ways, provided the re-import happens within the period allowed — commonly three years, with extensions available on application. Indian goods returned in the same state can also come back under the re-importation provisions of the Customs Act 1962. As with most Indian customs concessions, the identity link between the shipping bill at export and the bill of entry at re-import is the operative condition, not the invoice value.

Where the arithmetic turns against you

Three factors regularly invert the calculation.

The first is additional duties. Where Section 301 rates apply to the country of processing, they attach to the dutiable portion at a level several times the base rate. A programme that saves 2.6 % on the deducted component value can still lose far more on the added value than it gains, and the sourcing decision should be modelled on the total, not on the relief.

The second is free trade agreements. If the finished article qualifies for preferential origin where it is assembled, the preferential rate may already be zero and the claim becomes redundant paperwork. Test origin first.

The third is freight. Outbound and inbound transport almost always enters the dutiable base under repair and processing provisions, and it is the line most often left out of the spreadsheet. On air-freighted machinery, it can exceed the repair invoice itself.

Model both entries — full value against value added, with freight and any additional duties included — before the components ship. The TRADE-COST calculator puts the two scenarios side by side.