Import duties and taxes are generally calculated using the goods' tariff classification, customs value, origin and the rates and rules applicable at entry. Freight, insurance and other value elements may be relevant depending on the valuation basis. Additional product or transaction charges can also apply. An estimate supports planning, but customs makes the final assessment.
Import cost planning begins with reliable shipment facts. A percentage copied from a prior entry is not enough when the product, value, origin, route or rules have changed.
Exact treatment should be checked against current official requirements. This guide explains the framework without publishing changing rates or presenting an estimate as guaranteed.
Start with classification and origin
HS classification connects goods to a tariff line and potential duty treatment. Permits or other charges may also be linked to classification.
Origin can affect preference only when an applicable agreement and its conditions are satisfied.
Determine the customs value
Valuation commonly begins with transaction information and may require additions, adjustments or another method under applicable rules.
Invoices, contracts, payments and transport costs help explain the declared value. Unsupported values create compliance risk.
Build a transparent estimate
Separate customs value, duty, tax, product-specific charges and logistics costs. Record the exchange rate and assumptions used.
Keep customs charges separate from carrier, terminal, storage, brokerage and inland delivery charges.
Practical checklist
Confirm classificationBase the estimate on supported product data.
Review originCheck the rule and evidence if preference is claimed.
Assemble value recordsInclude invoices, freight, insurance and relevant adjustments.
State assumptionsRecord rates, currency, timing and exclusions.
Reconcile the assessmentCompare the customs result with the estimate.
Common mistakes to avoid
Other valuation elements may be relevant.
Different charges use different rules.
Currency conversion affects the declaration.
This makes estimates difficult to audit.
Practical business guidance
- Use scenarios when classification, origin, freight or exchange-rate inputs are not final.
- Keep evidence for every estimate input so it can be updated efficiently.
- Investigate material differences between estimates and assessments.
Frequently asked questions
Is duty based only on purchase price?
Not always; applicable valuation rules determine the customs value.
Does every import pay the same rate?
No. Classification, origin, value, goods and current rules affect treatment.
Can a broker guarantee the amount?
A broker can estimate from supplied facts, but customs makes the final assessment.
Are freight and insurance relevant?
They may be relevant depending on valuation rules and the transaction.
Why keep a landed-cost worksheet?
It makes assumptions visible and supports comparison with actual outcomes.