Automated customs clearance
Automated HS code classification, cross-border duty calculation, and international shipping documentation handled for every shipment. No customs expertise required.
Who it's for
Automated customs for every cross-border seller
Whether you ship ten parcels a week or hundreds, automated customs clearance removes the paperwork bottleneck from your international fulfillment workflow.
E-commerce sellers shipping to the EU and UK
If you are shipping products across European borders, every parcel needs correct HS codes, duty calculations, and customs forms. Mastersel automates all of that so you never need to look up tariff categories or fill out CN22/CN23 forms manually. Combined with smart courier routing, your international shipments move through customs smoothly and reach buyers faster.
Sellers new to international shipping
Cross-border customs is one of the biggest barriers to international selling. If you have avoided shipping internationally because customs paperwork feels overwhelming, Mastersel removes that barrier entirely. The platform handles compliance behind the scenes so you can sell globally with the same simplicity as shipping domestically. No customs brokers needed, no regulatory knowledge required.
High-volume sellers looking to reduce compliance costs
Traditional customs broker fees of €3-10 per shipment add up fast when you process hundreds of international orders. Mastersel eliminates those per-shipment fees entirely — customs automation is included free with every label. That cost savings goes directly to your bottom line, making it easier to scale into new markets profitably without worrying about rising compliance overhead.
Customs Automation
EU customs compliance automation for cross-border sellers
Mastersel generates all required international shipping documentation, calculates duties against current tariff schedules, and handles commercial invoice generation automatically for every cross-border shipment — including EU and post-Brexit UK requirements.
Automated HS code classification
Products are classified across 5,000+ Harmonized System code categories based on description, material, and attributes. Incorrect codes cause 5-15% of cross-border parcels to be delayed at customs — Mastersel eliminates that risk so your shipments reach customers through the fastest route. The classification engine stays current with tariff schedule updates across all 30+ destination countries, including changes to EU Combined Nomenclature codes and UK-specific tariff classifications introduced after Brexit.
Cross-border duty calculation
Import duties and taxes calculated in real time for every destination. EU de minimis thresholds (€150 for commercial goods), IOSS VAT handling, and UK post-Brexit tariff rates are applied automatically. Customers see accurate landed costs with no surprises — helping you sell globally with confidence. Accurate duty calculation also reduces the rate of refused deliveries, which occur when customers are surprised by unexpected customs charges at their doorstep.
Commercial invoice generation
Commercial invoices, CN22/CN23 customs forms, packing lists, and declarations created automatically with every shipping label. Documents are formatted for each destination country, including IOSS numbers for EU VAT compliance. Manage orders and customs paperwork from one dashboard. Each document includes the correct product descriptions, values, weights, and origin information needed for smooth customs processing — no manual data entry required from you at any step.
Compliance guaranteed
Stay compliant with import regulations across 30+ destination countries automatically. Tariff schedules update as trade agreements change, and compliance errors — which can result in fines of €50-500 per shipment — are prevented before they happen. Ideal when you expand to new markets. The platform monitors regulatory changes across all supported countries and applies updates to your customs documentation workflow without requiring any action on your part, keeping you compliant even as international trade rules evolve.
By the numbers
Customs complexity, eliminated
How it works
Customs handled in three steps
No customs brokers, no paperwork. Automated HS code classification, cross-border duty calculation, and commercial invoice generation happen the moment you create a shipping label.
Products are classified
When your catalog syncs, each product is automatically assigned the correct HS code from 5,000+ categories based on its description, material composition, and category. This feeds into accurate multi-currency pricing and duty estimates.
Duties are calculated
When an order is processed, import duties and taxes are calculated in real time for the destination country using current tariff schedules — including EU de minimis thresholds and post-Brexit UK rates.
Documents are generated
Commercial invoices, CN22/CN23 customs forms, and packing lists are created with the shipping label. Attach and ship — compliance handled. Tracking activates automatically, and returns are covered if anything goes wrong.
Why Mastersel
Automated customs vs. manual compliance
See how EU customs compliance automation eliminates the documentation headache from cross-border selling.
| Task | Doing it manually | With Mastersel |
|---|---|---|
| HS code lookup | Search 5,000+ tariff categories | Auto-classified per product |
| Duty calculation | Calculate per shipment | Real-time auto calculation |
| Invoice creation | Fill CN22/CN23 forms manually | Generated with each label |
| Regulation updates | Monitor EU, UK, and trade changes | Auto-updated tariff data |
| Post-Brexit UK docs | Separate UK customs forms | UK-specific docs auto-generated |
| IOSS VAT handling | Track VAT rules per EU country | IOSS numbers applied automatically |
| Compliance risk | Fines of €50-500 per error | Fully compliant documents |
| Cost | €3-10 per shipment broker fees | Free — included with every label |
FAQ
Customs automation FAQ
How are HS codes assigned?
Mastersel uses automated HS code classification to assign the correct Harmonized System codes from over 5,000 product categories. Each product is matched based on its description, material composition, intended use, and category attributes. This matters because incorrect HS codes are one of the leading causes of border delays — an estimated 5-15% of cross-border parcels are held due to documentation errors. Getting HS codes wrong can result in shipments being held at the border, returned to sender, or subject to compliance fines of €50-500 per shipment. Mastersel eliminates that risk entirely with automated classification that stays current with tariff schedule updates.
Are customs documents generated automatically?
Yes. Mastersel handles commercial invoice generation, packing lists, and customs declarations automatically with every shipping label. For shipments under €300, CN22 forms are generated; for higher-value consignments, the more detailed CN23 form is used — each formatted to meet destination country requirements. EU-bound shipments include IOSS (Import One-Stop Shop) numbers for VAT compliance when applicable. Post-Brexit UK shipments receive the specific documentation required for UK customs clearance, including commodity codes and origin declarations. All international shipping documentation is attached to the label so you can print and ship without filling in a single customs field yourself.
How accurate are duty calculations?
Cross-border duty calculation in Mastersel is based on current tariff schedules for each destination country, updated regularly as trade agreements and import regulations change. For EU shipments, the de minimis threshold of €150 for commercial goods is applied automatically — shipments below this value are exempt from customs duties but still subject to VAT. Tariff rates shift when new trade agreements take effect between countries, and Mastersel tracks those changes so your duty estimates remain accurate. This prevents unexpected charges at delivery that frustrate customers and lead to refused parcels. Customs broker fees typically run €3-10 per shipment; Mastersel replaces that cost entirely. See how this supports localized shopping experiences.
Do I need customs expertise to ship internationally?
No. Mastersel provides full EU customs compliance automation so you can ship internationally without any customs knowledge. The platform handles automated HS code classification, cross-border duty calculation, and commercial invoice generation behind the scenes. Whether you are shipping to EU member states with IOSS VAT requirements, the UK with post-Brexit customs rules, or other international destinations, the correct documentation is produced automatically. Compliance errors can result in fines of €50-500 per shipment and cause parcels to be held, delayed, or returned — so automation removes a real financial risk. You simply create a shipping label through Mastersel and every required form is generated and attached.
Is customs automation included for free?
Yes. All customs features — automated HS code classification, cross-border duty calculation, and commercial invoice generation — are included at no extra cost. There are no customs automation fees, no per-document charges, and no compliance surcharges. Traditional customs broker fees run €3-10 per shipment, which adds up quickly when you are processing hundreds of international orders. Mastersel absorbs that complexity into the platform so you only pay for shipping labels at carrier cost. This applies to all 30+ supported destination countries, including EU member states, the UK, and other international markets with distinct customs requirements and tariff schedules.
What happens if customs regulations change after I start shipping to a country?
Mastersel continuously monitors and updates tariff schedules, trade agreements, and import regulations across all 30+ supported destination countries. When customs rules change — such as new duty rates, updated de minimis thresholds, or revised documentation requirements — the platform applies those changes automatically to your future shipments. This is particularly important for post-Brexit UK shipments where rules have evolved, and for EU countries where IOSS VAT requirements continue to be refined. You do not need to track regulatory updates yourself, making it safe to sell globally without worrying about falling out of compliance.
Can Mastersel handle customs for shipments to the UK after Brexit?
Yes. Post-Brexit UK shipments require specific customs documentation including commodity codes, origin declarations, and distinct VAT handling that differs from EU intra-community rules. Mastersel generates all required UK customs paperwork automatically with every shipping label — proper HS code classification under the UK's own tariff schedule, accurate duty calculations based on UK-specific rates, and commercial invoices formatted to meet UK Border Force requirements. Many cross-border sellers struggle with post-Brexit compliance because the UK now operates as a separate customs territory. Mastersel eliminates that complexity so you can expand into the UK market just as easily as selling to any EU country.
Why automated customs documentation is essential for scaling cross-border sales
Customs documentation is the single most common reason international shipments are delayed, returned, or rejected at the border. Incorrect or incomplete HS codes lead to wrong duty calculations. Missing commercial invoices trigger customs holds. Inaccurate declared values raise red flags and result in inspections. For sellers who handle customs paperwork manually — looking up HS codes in tariff databases, filling out commercial invoices by hand, calculating duty rates per country — every shipment is an opportunity for error. At scale, these errors become statistically inevitable and extremely costly.
Mastersel automates the entire customs documentation process. When you generate a shipping label, the system automatically assigns the correct HS code based on your product category, prepares the commercial invoice with accurate declared values, calculates duty and VAT for the destination country, and attaches all required documentation to the shipment electronically. This happens in the background for every single order — whether you are shipping 5 packages or 500 — with zero manual input from you.
HS code assignment and duty calculation
The Harmonized System (HS) is an international product classification system used by every customs authority. Each product must have the correct 6-10 digit HS code for the destination country. A "cotton t-shirt" has a different HS code than a "polyester t-shirt," and the duty rate differs for each. Manually looking up HS codes for hundreds of products across 30+ destination countries is impractical — and getting it wrong means either overpaying duties (eating into margins) or underpaying (triggering fines and shipment holds). Mastersel's classification engine assigns HS codes based on your product data, ensuring accurate duty calculations for every corridor. Combined with optimal carrier selection, accurate customs data helps packages clear borders faster.
Pre-clearance and electronic submissions
Modern customs processing increasingly relies on electronic pre-clearance — submitting shipment data to customs authorities before the package physically arrives at the border. Packages that have been pre-cleared move through customs faster because they have already been screened and approved before arrival. Mastersel submits customs data electronically where supported, reducing the time packages spend at border checkpoints. For sellers shipping to countries outside the EU from within the EU (or vice versa), this pre-clearance is especially valuable because it prevents the multi-day customs delays that destroy buyer experience and lead to order cancellations. Track clearance times by corridor in your analytics dashboard to identify and address any persistent delay patterns.
Customs compliance built in — no extra cost
No customs broker fees, no per-document charges. Automated HS code classification, duty calculation, and commercial invoice generation included with every label.