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Customs clearance is the official process every shipment goes through before release: paperwork review, HS code and value checks, duty and tax collection, then release. This guide covers the fundamentals and links to Epic's country-specific walkthroughs.
In short: Customs clearance is the official process every import shipment goes through before it's released to you — your customs authority checks the paperwork, confirms the HS code and declared value, collects any duty and tax owed, and then releases the goods. It involves three parties (you or your customs broker, the shipping carrier, and the customs authority), relies on a handful of standard documents (commercial invoice, packing list, bill of lading, and sometimes a certificate of origin), and the Incoterm on your order determines who's actually responsible for handling it. Delays almost always come down to missing or mismatched paperwork, not bad luck. This guide covers the fundamentals that apply everywhere, then links out to Epic's detailed, country-specific walkthroughs for the USA, Ireland, Singapore, South Africa, and the UAE.
Last updated: October 20, 2026
What is customs clearance?
Customs clearance is the legal process of getting goods through a country's customs authority so they can officially enter the country. Every shipment crossing an international border — whether by sea, air, or courier — has to pass through this checkpoint. Customs reviews your paperwork, verifies what's actually in the shipment matches what's declared, assesses any duties and taxes owed, and then issues a release. Only after that release can the goods move to a warehouse, a courier for final delivery, or straight to your door.
For first-time importers, the easiest way to think about it: customs clearance is the "toll booth" between the ship or plane landing and the goods actually becoming legally yours to sell or use.
Who is actually involved in customs clearance?
Three parties typically touch a shipment during clearance. The carrier (the shipping line, airline, or courier) notifies customs that the shipment has arrived and holds it until clearance is complete. The customs authority (like CBP in the USA, Irish Revenue, Singapore Customs, SARS in South Africa, or UAE Customs) reviews the declaration and decides whether to release, inspect, or hold the shipment. And you — or, far more commonly, a licensed customs broker acting on your behalf — files the import declaration and pays any duties and taxes owed.
Most importers never deal with customs authorities directly. A customs broker (often arranged through your freight forwarder) handles the filing, and a sourcing partner like Epic Sourcing coordinates the paperwork with your supplier so the broker has everything needed before the shipment even leaves China or Vietnam. Our own freight forwarding service coordinates exactly this handoff for clients.
What documents does customs actually need?
The specific list varies slightly by country and product, but almost every shipment needs: a commercial invoice (what was sold, to whom, and for how much), a packing list (what's physically in each carton or container), a bill of lading or air waybill (proof of shipment and the contract of carriage), and the correct HS code for each product, which determines the duty rate. Certain goods also need a certificate of origin, a certificate of conformity, or product-specific certifications (electrical safety, textile labelling, or food/cosmetic compliance) depending on both the product category and the destination country's rules.
What's the difference between duties, taxes, and customs fees?
These three get lumped together as "customs costs," but they're calculated differently. Duty is a tariff charged as a percentage of the goods' value, set by the destination country based on the product's HS code and where it was made. Tax — VAT, GST, or sales tax depending on the country — is then usually charged on top of the goods value plus duty, not on the goods value alone. Customs fees (brokerage, disbursement, or handling fees) are what your broker or carrier charges for processing the clearance itself, separate from what you owe the government.
| Cost type | Who it's paid to | How it's usually calculated |
|---|---|---|
| Duty | Destination country's government | % of declared goods value, based on HS code and origin |
| Import VAT/GST/sales tax | Destination country's government | % of (goods value + duty + freight, depending on country) |
| Brokerage/clearance fee | Your customs broker or freight forwarder | Flat fee or % of shipment value, set by the broker |
How do Incoterms decide who handles customs clearance?
The Incoterm written into your purchase order determines who's responsible for export clearance (leaving China or Vietnam) and import clearance (entering your country). Under FOB (Free On Board), the supplier handles export clearance and you — or your broker — handle import clearance on arrival. Under EXW (Ex Works), you're responsible for both legs, which is why EXW usually needs a freight forwarder managing the whole chain. Under DDP (Delivered Duty Paid), the seller handles everything including import clearance and duty payment, and you simply receive the goods — convenient, but you lose visibility into what duty rate was actually applied.
Most first-time importers are better off with FOB plus a freight forwarder or sourcing agent coordinating the import side, since it keeps you in control of the HS code and customs value being declared.
What causes customs clearance delays?
The overwhelming majority of delays trace back to paperwork, not bad luck. The most common causes are a mismatched HS code between the invoice and the actual goods, a declared value that doesn't match the commercial invoice, missing certificates for regulated goods (electronics, toys, cosmetics, textiles), an unclear or vague product description, or a missing certificate of origin where a trade agreement or anti-dumping check applies. Random inspections also happen and aren't a sign anything's wrong — they simply add time while customs physically checks a sample of the shipment. Getting the paperwork right starts upstream of customs entirely — before you even pay a supplier, see our guide on Alibaba Trade Assurance if you're ordering online, or on buying at Guangzhou's wholesale markets if you're sourcing in person.
What happens if customs holds a shipment?
If a shipment is flagged, customs will typically request additional documentation or clarification before deciding to release, further inspect, or in rare cases reject the shipment. Most holds resolve within a few days once the broker supplies what's requested. Storage fees at the port or airport usually start accruing during a hold, which is one more reason accurate paperwork before the shipment ships matters more than fixing it after arrival.
Find your country: detailed customs clearance guides
The fundamentals above apply everywhere, but duty rates, required certificates, and the clearance process itself vary significantly by country. Epic Sourcing has published a detailed, step-by-step customs clearance guide for each of our core markets:
- Customs Clearance from China to the USA
- Customs Clearance from China to Ireland
- Customs Clearance from China to Singapore
- Customs Clearance from China to South Africa
- Customs Clearance from China to the UAE
Frequently asked questions
Do I need a customs broker, or can I clear goods myself?
In most countries you can self-file for simple, low-value shipments, but almost every commercial importer uses a licensed broker, since errors in an HS code or declared value can trigger penalties, not just delays.
How long does customs clearance normally take?
For a straightforward shipment with complete paperwork, clearance typically takes 1-3 business days after arrival. Shipments flagged for inspection, or missing documentation, can take a week or more.
Can customs clearance happen before the ship arrives?
Yes — many countries allow "pre-clearance," where the broker files the declaration while the shipment is still in transit, so clearance is largely complete by the time it physically arrives, speeding up release.
What's the difference between customs clearance and a customs audit?
Clearance happens on every shipment as it enters the country. An audit is a separate, retrospective review of past import declarations that a customs authority can conduct months or years later to check compliance.
Does Vietnam customs clearance work the same way as China?
The fundamentals — documents, HS codes, duty calculation — are the same regardless of origin country. What changes is the trade agreement context: goods from Vietnam may qualify for different preferential duty rates than goods from China under certain free trade agreements, depending on your destination country.
How Epic Sourcing helps
Epic Sourcing's bilingual teams in China and Vietnam prepare accurate commercial invoices, packing lists, and certificates alongside your supplier before a shipment ever leaves the factory — which is the single biggest factor in avoiding a customs delay. We coordinate directly with freight forwarders and customs brokers across the USA, Ireland, Singapore, South Africa, and the UAE so clearance is a formality, not a fire drill. Get in touch with our team — no pressure, no obligation.