Guides
Customs clearance step by step — simple and stress-free
December 20, 202512 min readPaweł Dubel
Practical guide to import customs clearance in the EU. CN classification, duty, VAT, MRN declaration — all in one place with an online calculator.
Customs clearance is the set of formalities required to legally bring goods from outside the European Union into EU territory. During customs clearance, authorities verify the goods, their value, country of origin, HS/CN code, and applicable duties and VAT. A successfully completed clearance results in the release of goods and the issuance of an MRN number.
Are you importing goods from outside the European Union and don't know where to start? The entire process can be broken down into a few simple steps if you know what to look out for.
According to National Revenue Administration (KAS) data, the most common causes of delays and additional duty payments are errors in product classification (wrong CN code) and incorrectly calculated customs value. In practice, this means: inspection, correction, penalties — and above all, stress. This can be avoided.
In this guide, I'll walk you through the entire import customs clearance process — from finding the correct customs code, through calculating duties (customs duty, VAT, additional fees), to submitting the customs declaration and obtaining the MRN number.
Common pitfalls we'll cover:
- Wrong CN code — results in incorrect duty rates and potential penalties
- Missing EORI number — the system will reject your declaration without it
- Undervalued invoice — leads to additional payments and inspections
- Not including transport costs in customs value — results in underpaid VAT
What you'll gain from reading:
- Understanding of required documents (commercial invoice, packing list, EORI)
- Ability to independently verify duty rates in TARIC/ISZTAR
- Knowledge of differences between courier, air, and sea clearance
- How to use deferred VAT (Art. 33a) to improve cash flow
You don't need to memorize all the regulations. You just need to know where to find information and how to use the right tools.
Find CN code → TARIFF FINDER
Calculate duty and VAT → DUTY AND VAT CALCULATOR
What is customs clearance and what documents are needed?
Before declaring your goods, prepare the necessary set of documents. Complete documentation is key to smooth clearance — missing even one element can delay goods release by several days.
Required documents (minimum):
- Commercial invoice — currency, Incoterms, seller/buyer details
- Packing list — quantities, gross and net weight, packaging method
- Freight/transport details — transport document number (air AWB, sea B/L, courier), carrier
- EORI number (Economic Operators Registration and Identification) of the importer
- HS/CN code (product classification) + any additional documents: certificate of origin, certificates, permits
- Transport invoice — required if transport costs are not included in the goods price according to Incoterms (e.g., for EXW, FCA, FOB)
Start with the code — find it using TARIFF FINDER. Calculate duty/VAT — use DUTY AND VAT CALCULATOR.
Clearance process — from A to Z
Step 1 — Product classification (HS/CN code)
This is the absolute foundation. What does customs clearance involve step by step? You start with proper classification: the HS/CN code determines the duty rate, required documents, and sometimes additional procedures (e.g., sanitary, security). Wrong code = risk of additional duty, customs inspection, and delays.
- Use TARIFF FINDER
- Compare descriptions and shipment contents with CN explanatory notes
- For complex goods (e.g., electronics with battery), apply the common rule: classify by main function
Step 2 — Check rates (TARIC/ISZTAR) and calculate duties
Once you have the code, check rates in TARIC/ISZTAR (EU/Poland). Then calculate customs duties and VAT. Remember the customs value (CIF: goods value + transport to EU border + insurance).
Incoterms and customs value: Customs value depends on the applicable Incoterms rules. If you buy on EXW or FCA terms, you must add transport costs to the EU border to the goods value. With CIF/CIP, these costs are already included in the price. With FOB, you add sea/air freight. Incorrect customs value calculation is one of the most common import mistakes.
Quick reference — Incoterms vs Customs Value:
| Incoterms Rule | Is transport included in goods price? | Add transport to Customs Value? |
|---|---|---|
| EXW | No | YES (from supplier's door to EU border) |
| FOB / FCA | Partially | YES (freight/flight cost to EU border) |
| CIF / CIP | Yes | NO (cost already in invoice price) |
| DDP | Yes | NO (everything included, incl. duty/VAT) |
Consider:
- Preferential origin (may reduce duty)
- Anti-dumping, additional charges
Dependencies:
- Duty calculated on customs value
- VAT usually calculated on (customs value + duty + costs to first place in EU)
Check if you qualify for deferred VAT (Art. 33a of Polish VAT Act) — see FAQ.
Calculate online → DUTY AND VAT CALCULATOR
Step 3 — Customs declaration (broker or self), MRN
You can submit a customs declaration yourself (PUESC) or through a customs agency/broker. After submitting the declaration, the office assigns an MRN (Movement Reference Number) — this is your case identifier and certified customs declaration after goods release.
Practical note: Self-filing declarations via PUESC is technically complex — it requires knowledge of XML schemas, procedure codes, and specialized software. In practice, most businesses use customs agencies that have integrated systems and experience with specific customs offices.
What is MRN? It's a unique reference number in customs systems used by the customs office, carrier, and recipient. It enables status tracking (e.g., whether the shipment is under inspection or cleared).
Incomplete customs declaration: in exceptional situations, you can submit an incomplete declaration (e.g., missing document). After submission, you must provide the missing information within the deadline set by the customs office. This is a form of simplified clearance provided by the Union Customs Code.
Step 4 — Inspections (if any) and goods release
Customs and tax authorities may conduct inspection: documentary, physical (goods examination), security, compliance with other customs procedures. If everything is in order, goods are released and you can continue international trade (e.g., delivery to destination, storage, sale).
Check the basis for charges before inspection arrives → DUTY AND VAT CALCULATOR
Step 5 — After clearance (VAT settlement, archiving)
After customs clearance:
- Settle VAT (immediately, deferred, or in declaration — depending on method)
- Keep all documentation in electronic form: commercial invoice, customs declaration, MRN, payment confirmations, origin documents — these are reliable evidence for tax/customs audits
- Ensure archiving for the period required by regulations
Generate calculation report → DUTY AND VAT CALCULATOR
Courier vs. sea vs. air clearance — practical differences
Key differences in air, sea, and courier (DHL/FedEx) clearance:
Clearance time:
- Courier (DHL/FedEx): usually a few hours to 1 day (when data is complete)
- Air (cargo): 1–2 days (often faster than sea)
- Sea: 1–3 days after unloading + port formalities
Cost:
- Courier: higher handling fees for customs service, but faster; small shipments
- Air: higher transport costs, lower terminal costs than sea
- Sea: lowest freight for large volumes, additional port costs
Documents:
- Courier: shipment number, simplified procedures; simplified customs clearance often used
- Air: AWB, often security requirements
- Sea: B/L, more frequent scanning inspections
Administrative involvement:
- Couriers often act as representatives; formalities handled in the background
- With air/sea, you more often work with customs agencies and customs offices
Customs clearance duration
The duration of customs clearance depends on many factors: type of transport, document completeness, customs office workload, and whether the shipment has been selected for inspection.
Approximate clearance times:
- Courier shipments (DHL, FedEx, UPS): from a few hours to 1 business day — if documentation is complete and there's no inspection
- Air shipments (cargo): 1–2 business days from the moment of customs declaration submission
- Sea shipments: 1–3 business days after unloading at port, including terminal formalities
What can extend clearance time?
- Missing or incomplete documents (invoice, packing list, certificate of origin)
- Incorrect or questionable CN code — the office may request additional clarification
- Shipment selected for inspection (documentary, physical, or scanner)
- Goods subject to special requirements (e.g., sanitary, phytosanitary, conformity certificates)
- Customs office workload during peak season (e.g., before holidays, Black Friday)
How to speed up clearance?
- Prepare complete documentation before goods arrive
- Verify the CN code in TARIFF FINDER and ensure it's correct
- Work with an experienced customs agency familiar with the procedures of the specific office
- Consider obtaining AEO (Authorized Economic Operator) status — preferential treatment during inspections
Comparison table: clearance variant
| Clearance variant | Typical time | Costs (approximate) | Key documents |
|---|---|---|---|
| Courier (DHL/FedEx) | few hours – 1 day | operator customs fee + duty + VAT | commercial invoice, shipment data, CN code, EORI number |
| Air (cargo) | 1–2 days | air freight + handling + agency + duty/VAT | invoice, packing list, AWB, CN code, EORI, possibly certificate of origin |
| Sea (FCL/LCL) | 1–3 days after unloading | sea freight + THC/terminal + agency + duty/VAT | invoice, packing list, B/L, CN code, EORI, possibly certificate of origin |
Common mistakes and how to avoid them
| Mistake | Consequences | Solution |
|---|---|---|
| Wrong HS code | Wrong rates and penalties | Verify in TARIFF FINDER + analyze CN descriptions |
| Missing EORI number | System rejects declaration | Apply for EORI number in advance (PUESC) |
| Undervalued invoice | Additional payments, penalties | Accurate commercial invoice and payment proof |
| Wrong Incoterms (e.g., DDP unprepared) | Unexpected costs | Match Incoterms to your import capability |
| Missing origin proof for preference | Lose 0% duty | Verify origin rules and documents (REX, EUR.1) |
| Incomplete declaration data | "To clarify" status | Use incomplete declaration, but complete within deadline |
| Missing agency authorization | Clearance blocked | Prepare power of attorney and signature samples |
| Not including transport/insurance costs | Underpaid VAT | Calculate correctly in DUTY AND VAT CALCULATOR |
Examples (with numbers) — various sectors
Disclaimer: Rates/amounts are approximate. Verify actual rates in TARIC/ISZTAR and calculate using DUTY AND VAT CALCULATOR.
Case 1: Courier clearance (clothing)
- Product: 100% cotton t-shirt
- HS/CN code (example): 6109.10
- Goods value (FOB): EUR 1,000
- Transport/insurance to EU border (CIF): EUR 50
- Customs value: EUR 1,050
- Duty rate: 12%
- Duty: 1,050 × 12% = EUR 126
- Costs to first place in EU: EUR 20 (e.g., courier)
- VAT base: 1,050 + 126 + 20 = EUR 1,196
- VAT 23% (PL): EUR 275.08
- Total duties: duty EUR 126 + VAT EUR 275.08 = EUR 401.08 (+ operator handling fees)
How does courier customs clearance work? Couriers (e.g., DHL/FedEx) typically submit the customs declaration as representatives, requesting the commercial invoice, payment confirmation, and CN code. You confirm the rates and pay the duties.
Case 2: Sea clearance (clothing — large batch)
- Product: cotton T-shirts
- HS/CN code (example): 6109.10
- Goods value (FOB): EUR 20,000
- Freight/insurance to EU port: EUR 1,200
- Customs value (CIF): EUR 21,200
- Duty rate: 12%
- Duty: 21,200 × 12% = EUR 2,544
- Costs to first place in EU: EUR 300
- VAT base: 21,200 + 2,544 + 300 = EUR 24,044
- VAT 23%: EUR 5,530.12
- Total duties: 2,544 + 5,530.12 = EUR 8,074.12 (+ THC, terminal, agency)
How we calculated this (X/Y formula)
- Customs value (CIF) = X = goods value (FOB) + transport to EU border + insurance
- Duty = rate × X
- VAT base (Y) = X + duty + costs to first place in EU
- VAT = VAT rate × Y
Legal basis: You only add transport costs to the point of entry into the EU customs territory to the customs value (pursuant to Art. 71(1)(e) of the Union Customs Code). Transport costs within the EU are not included in customs value but may be added to the VAT base.
Calculate automatically — DUTY AND VAT CALCULATOR
Frequently asked questions
How long does clearance take?
Courier: usually same day. Air: typically 1–2 days. Sea: 1–3 days after unloading (depends on terminal and customs office). Delays mainly result from missing data or inspections.
Do I need a customs agency?
No. You can submit a customs declaration yourself (PUESC). However, a customs agency speeds up the process and ensures compliance (especially for your first customs clearance).
What is MRN?
MRN (Movement Reference Number) is the reference number assigned by the customs system after accepting the declaration. You use it to track status, and after release it appears on the certified customs declaration.
Can I pay deferred VAT (Art. 33a)?
Yes. In Poland, there's a mechanism for settling VAT in the declaration (without payment at the border) if you meet the conditions (active VAT registration, no arrears, compliance with Art. 33a of the VAT Act). This reduces import financing costs.
How does courier clearance (DHL/FedEx) differ from air/sea?
Couriers operate in automated mode and often as representatives — fewer formalities on your side, but operator fees. Air/sea involve terminals and agencies, giving more control for large volumes.
Is there simplified clearance?
Yes. Under customs procedures, simplified clearance can be used (e.g., entry in records, incomplete declaration) when you meet conditions and obtain permits.
What if I don't have all data on time?
Submit an incomplete declaration and complete the documents (e.g., certificate of origin) within the deadline set by the customs office. You'll avoid unnecessary delays.
Does export also require a declaration?
Yes. For export, you submit an export customs declaration (procedure 10xx). Similar rules, different legal bases. Ensure the customs border and exit customs office are correctly indicated.
Legal basis
| Legal act | Scope |
|---|---|
| Regulation (EU) 952/2013 | Union Customs Code (UCC) — basic EU customs provisions |
| Regulation (EU) 2015/2446 | UCC Delegated Regulation — detailed rules |
| Regulation (EU) 2015/2447 | UCC Implementing Regulation |
| Polish VAT Act (Journal of Laws 2024, item 361) | Art. 33a — deferred VAT on imports |
| Regulation (EEC) 2658/87 | Combined Nomenclature (CN) and Common Customs Tariff |
Useful tools and links
Celna24 tools:
- TARIFF FINDER — customs classification, CN/HS code search
- DUTY AND VAT CALCULATOR — calculate import costs
Official sources:
- TARIC (European Commission) — EU customs tariff online
- ISZTAR4 (Ministry of Finance) — Polish tariff browser
- PUESC — platform for EORI registration and customs declarations
- Access2Markets — information on duties, preferences, and trade agreements
Summary
- Correct HS/CN code — this is the foundation; errors mean risk of additional payments and inspections
- Accurate commercial invoice — all data, correct value, Incoterms
- Proper duty calculation — customs value (CIF) + duty + costs = VAT base
- Effective customs declaration (MRN) — via PUESC or customs agency
- Document organization — archiving in case of audits
With our tools, you'll do it faster and without stress.
Act now:
- Find CN code → TARIFF FINDER
- Calculate duty/VAT → DUTY AND VAT CALCULATOR
This article is for informational purposes only and does not constitute legal or tax advice. Legal status as of March 2026.
Related Articles
Dec 20
EORI, IOSS and OSS 2026 — Complete Guide for E-commerce
How to obtain EORI, when to choose IOSS vs OSS? Guide to VAT procedures for e-commerce including changes from July 1, 2026.
Dec 20
Find a Customs Office in Poland — KAS Office Finder
Find your nearest customs branch or customs-tax office. Address, hours, contact and directions in one place.
Dec 20
Customs Duty & VAT Calculator — Calculate Import Costs Fast
Calculate customs duty, VAT and excise for imports to Poland. Free customs calculator with current rates, currency converter and PDF export.