Guides
Customs Readiness Guides
Plain-English guides for HS codes, import duty estimates, country of origin, commercial invoices, CN22/CN23, and ecommerce catalog customs readiness.
Guide Clusters
Questions TariffCatalog will answer first
These guide clusters support the live tools and create clean internal links for HS code, duty, document, and catalog readiness searches.
Understand which values, rates, and fees belong in an import duty estimate.
- How to calculate import duty from China to the United States
- Customs value vs declared value
- Section 301 additional tariffs
- De minimis and low-value shipments
- EU EUR 3 low-value ecommerce duty
- China to Australia ecommerce imports
- How to use TARIC for EU ecommerce imports
- IOSS customs declaration checklist
- US tariffs on electronics by HTS and origin
- FedEx customs duty bill dispute checklist
- US tire import tariff and trade-remedy checks
- Column 2 rate of duty in the US HTS
- Check AD/CVD by HTS code and country
- AD/CVD scope review records
- Chapter 99 HTS code workflow
- Section 232 derivative products
- Section 301 exclusion status
Prepare customs document drafts with the fields carriers and brokers usually ask for.
- Commercial invoice field reference
- Commercial invoice requirements for international shipping
- How to fill a commercial invoice
- How to fill a CN22 form
- How to fill a CN23 form
- CN22 vs CN23 for postal shipments
- Pro forma invoice vs commercial invoice
- Proforma invoice for samples
- Commercial invoice vs packing list
- Reconcile commercial invoice and packing list
- Commercial invoice for ecommerce returns
- Ecommerce international shipping documents
- Commercial invoice country of origin
- CN22 vs CN23 vs commercial invoice
- Customs invoice for warranty replacement
- Importer of record for ecommerce
- Royalties and customs value
- Commercial invoice for free-of-charge shipments
- Commercial invoice discounts for ecommerce
Clean product catalog customs fields before international shipping workflows begin.
- How to prepare a product catalog for customs
- Shopify international shipping HS code checklist
- How to add HS code and country of origin to a CSV catalog
- WooCommerce HS code and country of origin
- ECCN vs HS code vs EAR99 for ecommerce
- Substantial transformation origin evidence
- US country-of-origin marking
- USMCA certification data elements
- How often US HTS codes change
- Importer HTS classification records