Your supplier confirms the goods left the factory on schedule. The vessel arrives on time. Your broker tells you the container is sitting at the terminal. And then — for reasons nobody can explain clearly — it just stops moving. "It's with customs," your broker says, as if that sentence actually tells you anything. Meanwhile the demurrage clock is running, your client in Douala or Lagos wants to know where their order is, and you have no real way to tell whether this is a two-day delay or a two-week one.
Customs holds feel random from the outside. They almost never are. Clearance follows a defined sequence, and a hold traces back to one of five specific, identifiable causes — each with its own typical timeline and its own fix. This guide walks through how clearance actually works, the five reasons it stalls, and what to do if your cargo is sitting in customs right now.
Almost every customs hold on this corridor traces back to one of five identifiable causes — each with its own typical timeline and its own fix. Knowing which one applies to your shipment is the difference between resolving it in days and waiting in the dark for weeks. Primary causes behind nearly all China-Africa customs holds
How Customs Clearance Actually Works
If you've read our guide on the full shipping timeline, you already know the five-step shape of clearance: lodgement, duty assessment, payment, lane assignment, release. This section goes one level deeper — into who's actually doing what at each step, and where a human judgment call enters a process that otherwise looks automated.
Lodgement is where your broker submits your customs declaration electronically, attaching your commercial invoice, packing list, Bill of Lading, Certificate of Origin, and any additional certificates your cargo requires. In most African customs systems with automated platforms, this step itself is fast — often same-day. What happens next depends entirely on what the system, and the officer reviewing it, makes of what's been submitted.
Duty assessment is where the declared HS code, the declared value, and the applicable tariff schedule get checked against each other. This is largely systematic, but not entirely — a customs officer can flag a declaration for manual review if something looks inconsistent, even if every individual field is technically valid. This is the point where many holds actually originate, well before any physical inspection.
Payment follows assessment. Duties and taxes must be settled in full before cargo moves further — there's no partial release, no provisional clearance while a dispute gets resolved on the side.
Lane assignment is the moment your shipment is routed to green lane (no physical inspection) or red lane (full container examination). Documentation quality strongly influences this — clean, consistent paperwork doesn't guarantee green lane, but messy paperwork makes red lane far more likely.
Release is the final step: customs issues a release order, your broker presents it at the terminal, and your transporter gains collection authority.
Every one of these steps runs through your broker. They're not just a paperwork processor — they're your point of contact with a system that has real discretion built into it, and the difference between a broker who pushes a file forward and one who lets it sit is often the difference between a three-day clearance and a three-week one. See: How to Choose a Reliable Customs Broker in Africa.
The Five Reasons Cargo Gets Held
Nearly every customs hold on the China-Africa corridor traces back to one of five causes. Some are resolved quickly once identified. Others require starting a process that should have begun weeks earlier, back in China. Use this table as a first diagnostic — then read the relevant section below for what to actually do about it.
| Cause | Where It Surfaces | Typical Resolution |
|---|---|---|
| HS code mismatch | Duty assessment / lodgement | 3–10 working days |
| Missing or incorrect documents | Lodgement | 2–7 working days |
| Customs valuation dispute | Duty assessment | 5–15 working days |
| Missing pre-import authorization | Before lodgement is even possible | 2–6 weeks |
| Red-lane physical examination | Examination | 2–7 working days |
Cause 1 — HS Code or Classification Mismatch
This is the single most common cause of a customs hold on this corridor, and the most preventable.
The Harmonised System code on your declaration must match both the goods description on your commercial invoice and what customs actually finds when — or if — they look inside the container. Mismatches happen for a few predictable reasons: a Chinese supplier provides a generic description like "machine parts" or "electronic accessories" without specifying enough for accurate classification, a product genuinely sits at the boundary between two plausible codes, or a forwarder defaults to a code used on a previous, similar shipment without re-checking it against this one.
When customs flags a mismatch, the file typically gets pulled for manual review, which on its own can add several days even before anyone decides whether the classification dispute is minor or substantial. If the dispute is substantial — if the code you declared carries a meaningfully different duty rate than the code customs believes applies — you're looking at a formal reclassification process, which takes longer and may involve a duty recalculation, occasionally with a penalty attached for the original misdeclaration, even when it was a genuine error rather than an attempt to underpay.
👉 Pro Tip: Never let your HS code be decided by what a previous shipment used, and never accept a vague description from your supplier without pushing back. Confirm the specific code with your destination broker before the invoice is even issued — this is a five-minute conversation that prevents a week-long hold. See: HS Codes — Getting It Wrong Is Expensive.
Cause 2 — Missing or Incorrect Documentation
The most basic cause, and still one of the most frequent — because "basic" doesn't mean easy to get consistently right across an invoice, a packing list, a Bill of Lading, and however many certificates your cargo requires.
The pattern is almost always the same: one document says one thing, another says something close but not identical, and customs notices the gap. A consignee name that's abbreviated on the commercial invoice but spelled out in full on the Bill of Lading. A total weight on the packing list that doesn't quite match what's declared elsewhere. A Certificate of Origin missing the specific authorisation stamp your destination market requires, even though the document itself is genuine.
None of these are usually deliberate, and most aren't even significant on their own — but customs doesn't see one document at a time. The full set gets compared against itself, and any inconsistency is grounds to hold the file for clarification, regardless of how minor the discrepancy looks to you.
⚠️ Watch Out: This is the cause most easily prevented and most commonly not prevented, because the review happens too late to matter. By the time documentation errors are caught at the destination port, your cargo has already sailed — corrections at this stage mean amendments, reissues, and time you don't have. The fix isn't catching errors faster at customs. It's catching them before the vessel sails. See: Document Checklist and The Bill of Lading: Why Every Field Matters.
Cause 3 — Customs Valuation Dispute
Most importers assume customs simply charges duty on the invoice value. Often, that's exactly what happens. But customs authorities have the legal right to apply their own reference values for certain product categories, regardless of what your supplier's invoice says you paid — and when they do, your declared value and their assessed value can diverge significantly.
This tends to surface most often with goods where under-invoicing is a known historical problem in that product category, or where the declared value looks unusually low relative to similar shipments customs has processed before. It isn't necessarily a sign that anyone did anything wrong. It's a sign that customs' valuation system flagged your declaration for a closer look.
When this happens, your file is held pending resolution. You may be asked to provide additional evidence supporting your declared value — bank transfer records, a more detailed cost breakdown from your supplier, or a formal explanation for why your price falls where it does. Resolution can move quickly if your documentation is solid, or drag on for weeks if it isn't.
👉 Pro Tip: Keep your payment records and supplier correspondence organised and ready before you ever need them. If your declared value is ever questioned, the speed of your response — not the strength of your argument alone — often determines how long the hold lasts. See: Customs Value vs. Invoice Value — Know the Difference.
Cause 4 — Missing Pre-Import Authorization
This is the most severe cause on this list, because it isn't really a delay in the usual sense — it's a hard stop. Clearance simply cannot proceed.
Several African markets require specific authorisation in place before cargo can even be lodged with customs, let alone cleared. Nigeria's Form M has to be obtained from a commercial bank before the goods ship — not after. Several West and Central African markets require an ECTN or BESC registered before the vessel departs China. Regulated product categories across multiple markets require PVoC or SONCAP certification completed in China, before loading. None of these can be retrofitted once the cargo is already at the destination port.
When one of these is missing, your broker isn't waiting on a customs officer's decision — they're waiting on you, or your supplier, to complete a process that should have started weeks earlier, sometimes in a different country, sometimes involving a different institution entirely. This is why resolution timelines for this cause run so much longer than the others: 2 to 6 weeks isn't an exaggeration, and in some cases it runs longer still.
⚠️ Watch Out: A flawless commercial invoice, packing list, and Bill of Lading will not save you from a missing Form M or ECTN. These requirements exist independently of how clean the rest of your documentation is — and unlike a documentation error, this one usually can't be fixed quickly once your cargo has already arrived. The only real fix is confirming what your specific destination requires before the booking is even placed. See: Pre-Import Verification Schemes — What Cameroon and Nigeria Importers Must Know.
Cause 5 — Red-Lane Physical Examination
Sometimes nothing is actually wrong with your shipment — it's simply been selected for physical inspection, and the examination itself becomes the bottleneck.
Lane assignment can be triggered by a documentation inconsistency, as covered above, but it can equally be random selection, a pattern based on cargo type, or a risk profile tied to the importer, the route, or the product category, independent of anything specific to this shipment. Once a container is assigned red lane, it's moved to an examination area, opened, and checked against the declared contents — a process that, depending on the port's queue and the complexity of your cargo, typically takes 2 to 7 working days.
There's genuinely very little you can do once a container is selected — examination queues move at the port's pace, not yours. What you can control is how quickly the examination concludes once it starts.
👉 Pro Tip: Keep your packing list and container loading photos on hand if you can. A broker who can show the examining officer exactly how the container was packed, matched line by line against the documents, often moves the examination along faster than one starting from a completely blank slate.
What to Do If Your Cargo Is Already Held Right Now
If you're reading this because your cargo is sitting in customs at this exact moment, the diagnostic above matters less than what you do next.
Start by getting a specific answer from your broker — not "it's with customs," but the actual stated reason for the hold. Every customs system generates a specific query or flag when a file is held; your broker can and should be able to tell you exactly which of the five causes above applies to your shipment, and what document or action is needed to resolve it. If they can't give you a specific answer, that's a signal worth taking seriously about how actively your file is actually being managed.
Once you know the cause, the timeline becomes much clearer. A documentation gap might be resolved in days with the right paperwork sent through. A missing pre-import authorisation might genuinely take weeks, because the underlying process has to start from scratch. Knowing which one you're dealing with changes how you plan — and how you communicate with your own client about realistic delivery expectations.
While this is being resolved, remember that your demurrage and detention clocks don't pause for a customs hold. Both started running the moment your container was discharged at the terminal, regardless of why clearance is taking longer than expected. See Stage 6 of Your Cargo Takes 45 Days from China — Here's Every One of Them for exactly how these charges work and what they typically cost. This is worth knowing not because there's anything you can do to stop the clock, but because it changes the urgency calculation — a hold that might otherwise feel manageable becomes considerably more expensive the longer it sits unresolved.
Stay in regular contact with your broker rather than checking in once and waiting. Files that get followed up on tend to move faster than files that don't — not because of any formal process, but because a broker juggling dozens of shipments naturally prioritises the ones where the client is actively engaged.
- Get the specific cause from your broker — not a vague status update.
- Confirm which of the five causes applies and its typical resolution timeline.
- Check your demurrage and detention free-time windows immediately, so you know what's accumulating.
- Follow up regularly. An actively monitored file moves faster than a forgotten one.
Key Takeaways
- Most customs holds trace back to one of five identifiable causes — HS code mismatch, documentation errors, valuation disputes, missing pre-import authorization, or red-lane examination.
- The fastest holds to resolve are the ones with a known cause. Get a specific answer from your broker, not a vague status update.
- Missing pre-import authorization is the most severe cause because it's a hard stop, not a delay — the fix can't be applied retroactively once cargo has arrived.
- Demurrage and detention clocks run regardless of why clearance is taking longer than expected — the cost of a hold compounds the longer it goes unresolved.
Know Which One You're Dealing With
Every cause on this list has a fix. None of them are mysterious once you know which one applies to your shipment — the frustration of a customs hold comes almost entirely from not knowing, not from the hold itself.
That's really the whole point of this guide: not to promise that your cargo will never get held, because on this corridor, at some point, it will. The goal is to make sure that when it happens, you're not waiting on a vague explanation from someone who hasn't bothered to find the real one. You know what questions to ask, what to expect, and roughly how long it should take to resolve.
If your cargo is currently held and you'd like a second pair of eyes on what's actually happening with your file, our Shanghai-based team works directly with customs brokers across major African markets and can help you get a clear answer fast.
Dealing with a customs hold right now?
Our Operations team works directly with customs brokers across major African markets and can help you get a clear, specific answer fast.
Talk to Our Team →Last reviewed: June 2026 · Category: Customs & Compliance
Related articles: HS Codes: Getting It Wrong Is Expensive · Pre-Import Verification Schemes · Customs Value vs. Invoice Value · How to Choose a Reliable Customs Broker in Africa · Your Cargo Takes 45 Days from China
