What a pre-shipment inspection actually is
A pre-shipment inspection, usually shortened to PSI, is a physical check of your finished order at the factory before it ships. The industry-standard timing is when production is 100% complete and at least 80% of the goods are packed into export cartons. An inspector from a third-party firm (SGS, QIMA, Bureau Veritas, Intertek, TÜV Rheinland) spends a day at the factory, pulls a random selection of cartons from the finished stock, opens them, and compares what is inside against your purchase order and approved specification. You get a report the same evening or the next morning: pass or fail, with photos of every defect found.
The key word is third-party. The factory's own QC team has been looking at these goods for weeks and signed them off. A PSI is the first time someone paid by you, not by the factory, looks at what you actually bought. The inspector does not care about the factory's ship date or its relationship with the salesperson. That independence is the product.
What does the inspector check?
A standard PSI covers four things:
- Quantity. Finished and packed cartons counted against the purchase order, so you are not paying a 100% balance for an 85% shipment.
- Workmanship. A random sample drawn under the AQL standard ANSI/ASQ Z1.4 (equivalent to ISO 2859-1), with defects classified critical, major, and minor against limits you agree in advance. For consumer goods the common setting is 0 critical, 2.5 major, 4.0 minor at General Inspection Level II.
- Function and measurements. On-site function tests (does it switch on, hold weight, seal, charge), plus dimensions and weights checked against the spec sheet.
- Packaging and labeling. Export carton strength, shipping marks, barcodes that actually scan, retail packaging, and legally required markings for your destination market.
One thing to understand before you book: the inspector checks against the document you supply. A one-line spec produces a one-line inspection. The more precise your specification and your approved golden sample, the more a PSI is worth. If a detail matters to you, it has to be written down where the inspector can hold a unit against it.
How much does a PSI cost?
Inspections in mainland China are quoted per inspector-day, called a man-day. The major firms charge roughly $250 to $350 all-in per man-day, including travel within standard service areas. A typical consumer-goods order up to about 3,000 to 5,000 units fits in one man-day at Level II sampling. Bigger orders, several SKUs, or heavy function testing add man-days.
So the real question on a $30,000 order is whether the last look before shipment is worth about 1% of order value. Compare it with the alternative when things go wrong: a container of defective goods at your warehouse, ocean freight already paid, a 30% deposit you cannot recover, and a factory that knows you have no practical way to send anything back. Importers who skip the PSI are not saving $300. They are betting the whole order that the factory's internal QC was honest.
The lever: tie your balance payment to the report
A PSI report on its own changes nothing. By inspection day the factory holds your deposit and your goods. What gives the report teeth is your payment structure, and it has to be agreed before any money moves. Write it into the purchase order: balance payable after a passed pre-shipment inspection. On standard 30/70 terms, that clause means a failed report stops 70% of the money until the factory fixes its own defects. Without it, you are negotiating with someone who already has both your cash and your product.
Book the inspection 5 to 7 days ahead so the date is locked in before the factory starts pressing about the vessel cut-off, and never let "we will miss the ship date" talk you into wiring the balance first. We covered the payment side in detail in safe payment terms for Chinese suppliers.
When a PSI alone is not enough
A PSI happens when the goods are finished. Whatever the inspector finds is already built into every unit, and at that point only sorting or rework can fix it. Two situations call for an earlier checkpoint:
- Material substitution. If the factory quietly swapped a cheaper resin, fabric, or chipset in week one, a PSI catches the symptom after the full run is made. A during-production inspection (DUPRO) at 20 to 40% completion catches it while the rest of the run can still be saved.
- First orders with a new factory. No history means no basis for trust. Add a pre-production check of incoming materials and a DUPRO so problems surface in week two, when fixing them costs days instead of the whole order.
For a first order with a new supplier, the safer pattern is DUPRO plus PSI. For repeat orders at a factory with a clean record, a PSI alone usually carries the load. If your last shipment came out different from the sample you approved, the gap was almost certainly upstream of the PSI: we unpacked that in why the production run comes out different from the sample.
What happens if the goods fail?
A failed report is the system working, and it happens on roughly one in ten inspections across the industry. The sequence runs like this: the inspector issues a fail with photographed, classified defects. The decision then sits with you, not the factory. You can accept as-is (sometimes sensible for minor cosmetic issues), have the factory sort out defective units, or require a full rework and re-inspection. Most factories accept that the re-inspection man-day is on them when the failure was theirs, but write that into the purchase order too.
The one thing not to do is ship anyway because the deadline is close. A 6% defect rate at the factory does not shrink in transit. It arrives at your warehouse with freight and duty added on top, and turns into customer returns with your brand on the box.
Where Mila Sourcing fits
Pre-shipment inspection is the final stage of the 3-stage QC built into every Mila order: incoming materials checked first, a during-production checkpoint, and a PSI before the balance payment is released. The reports, photos, and the hold-or-release decision land in the same WhatsApp thread as everything else, so you see what the inspector saw before any money moves. That is the core of Sourcing Activation and Full Production Management.
Related, if you are tightening up quality control right now: