A package shipped from China gets stuck at customs for 11 days because someone declared the value at €5 to save €2 in duties. The customer cancels the order, files a dispute, and your refund rate climbs. The €2 in saved duties just cost you €40 in losses.
Customs declarations matter more than most dropshippers realize. Here are the five mistakes that consistently delay orders, trigger unexpected duties, and create disputes — and how to avoid them.
How customs actually works
A package from China to EU/US/UK passes through customs declaration at three points:
- Export from China: Chinese customs reviews outbound shipment (basic compliance)
- Import to destination: Destination customs reviews inbound shipment (this is where 95% of issues happen)
- Last-mile clearance: Carrier processes the final entry (mostly automatic)
The import step is where mistakes get expensive. Customs officials in EU/US/UK have algorithms that flag suspicious declarations for manual review. Once flagged, manual review takes 5-14 days. During that time, your package sits in a warehouse near the destination airport.
The customer doesn't know any of this. They see "package in transit" for two weeks, lose patience, and dispute.
Mistake 1: Severe under-declaration (the #1 issue)
The most common mistake: declaring a €30 product at €5 to save on duties.
How customs algorithms catch this:
- They compare declared value against typical retail prices for the product category and HS code
- They cross-reference against similar shipments from the same supplier
- They flag any declaration significantly below market expectation
When flagged, the package gets manually reviewed. The reviewer requests proof of declared value (invoice, payment proof). If your supplier provided fake documentation matching the under-declared value, customs may release after 5-7 days. If documentation doesn't match, customs may:
- Hold for 14+ days while requesting better documentation
- Reject the shipment entirely (returned to sender at your cost)
- Assess duties on the realistic value plus penalties (sometimes 30-50% added)
The fix: declare honestly. For most ecom products under €150, EU de minimis rules mean no duty anyway. For US shipments, the previous €800 de minimis exemption has been reduced since 2025 trade policy changes — but products under €150 still typically clear without duty.
Honest declaration costs almost nothing in duties for typical dropshipping products and dramatically reduces customs delay risk.
Mistake 2: Wrong HS code (Harmonized System code)
Every product has a 6-digit international HS code that classifies it for customs purposes. Different codes have different duty rates. Common HS code errors:
- "Other" or vague catch-all codes when a specific code applies
- Codes from product category A applied to category B (e.g., textile codes on electronics)
- Outdated codes that have been superseded (HS code system updates every 5 years)
When customs sees the wrong code, they manually re-classify. Manual re-classification takes 3-7 days. Meanwhile your package sits.
The fix: use the correct HS code for each product. Most fulfillment partners maintain HS code databases for common product categories. If they don't, ask them to look up the specific code for each SKU you ship — once per SKU, then reuse.
Pro tip: the EU and US publish HS code lookup tools online. For 50 SKUs, looking up the right codes takes 2 hours total and prevents customs delays forever.
Mistake 3: Generic product descriptions
"Plastic Item" or "Cosmetic Product" or "Electronic Device" as the customs description triggers automatic flagging in most jurisdictions. These vague descriptions look like deliberate obfuscation.
What customs wants:
- Specific item name: "Silicone Phone Case for iPhone 15"
- Material: "100% silicone"
- Use: "Mobile phone protective accessory"
- Quantity: "1 unit"
The more specific, the faster clearance. Vague descriptions get flagged for manual review.
The fix: provide your supplier with detailed product descriptions for each SKU. Update once, use forever. Most fulfillment software allows storing product descriptions that auto-populate on customs forms.
Mistake 4: Country of origin mismatches
The country of origin field tells customs where the product was manufactured (not just where it shipped from). For Chinese-manufactured products, the origin is China — even if they shipped through a Hong Kong consolidation hub.
Common error: declaring origin as "Hong Kong" or "Various" to avoid Chinese-origin tariffs. This works occasionally but increasingly often gets caught by automated systems that cross-reference with supplier documentation.
When caught, the consequences are severe:
- Duties retroactively assessed (sometimes including penalties)
- Future shipments from the same supplier flagged for enhanced review (every package becomes slow)
- Severe customs holds (14-21 days)
The fix: declare honestly. For US shipments, Chinese-origin products face certain tariffs depending on category. The cost of paying those tariffs is far lower than the cost of getting caught misrepresenting origin and having ALL future shipments flagged.
Mistake 5: Missing or incorrect IOSS/EORI numbers (EU specific)
For EU shipments under €150, the IOSS (Import One-Stop Shop) system allows you to pre-collect VAT at checkout and clear customs in seconds. Without IOSS, every package faces:
- VAT collection at customs (slows clearance 2-4 days)
- Carrier handling fees (€2-5 per package, billed to customer or to you)
- Higher chance of manual review
- Customer surprise when they're asked to pay VAT at delivery
For EU brands, IOSS registration is straightforward (Dutch sellers can register via Belastingdienst, similar in other EU countries). Once registered, you include your IOSS number on every shipment to the EU and customs clears in seconds.
EORI (Economic Operators Registration and Identification) is required for businesses importing/exporting in the EU. Without one, customs holds shipments until you provide it.
The fix: register for IOSS if you ship to EU. Get an EORI number if you operate in EU. Provide both to your fulfillment partner so every shipment includes them automatically.
The de minimis changes (2025-2026)
In 2025, the US ended its longstanding $800 de minimis exemption for most Chinese-origin goods. This means more US-bound shipments from China now face duty assessment.
For dropshippers, this changed the math:
- Pre-2025: Most US orders cleared duty-free
- Post-2025: Many US orders face 10-25% duty (varies by category)
If your average order value is below new de minimis thresholds (varies by country/product type), most orders still clear duty-free. Above thresholds, duties are factored in.
The implications:
- More accurate value declarations matter more (over-declaring costs you in duties, under-declaring risks customs holds)
- HS code accuracy matters more (different codes have different duty rates)
- IOSS-equivalent systems being expanded in other regions
What to do this week
If you're shipping to multiple countries and don't have a customs documentation process:
- Audit 10 recent shipments: pull tracking from each, find any with customs delays >3 days
- Identify the pattern: are the delays from one supplier? One product category? One destination country?
- Get HS codes for your top 10 SKUs: 2-hour task that prevents months of issues
- Register IOSS if shipping to EU: 1-2 day registration process
- Talk to your fulfillment partner: ask them to show you the customs declaration data for your last 10 shipments. If they can't, your partner has visibility problems.
A proper fulfillment partner handles customs documentation automatically — HS codes, accurate values, IOSS/EORI numbers, specific descriptions. Customs delays drop to near-zero. If you're seeing customs delays regularly with your current partner, the partner is the problem, not customs.
Prime Scale Fulfillment maintains HS code databases for all common ecom product categories and includes IOSS/EORI handling in standard operations. Customs delays on PSF shipments are 1-2% versus industry average of 8-15%. Discuss your customs setup on WhatsApp.