Duty and tax
Import duty calculator that starts from the right code
Most import duty calculators make you supply the tariff code yourself, which is exactly the part people get wrong. This one starts one step earlier: describe the product, and the AI classifies it, finds the duty rate for your lane, and runs the math on your shipment value.
Customs declaration · AI classifier
FORM TW-01
How import duty is calculated
Duty is a rate, attached to a code, applied to a value. The rate comes from the tariff schedule line your product classifies under, read for your origin country. The value is normally the customs value of the goods. Multiply them and you have the duty; the destination's import VAT or GST, where one exists, is then charged on the value plus the duty. The calculator above shows each line of that math separately so you can check it, and the blog post how to calculate import duty walks a full worked example.
Import tax calculator, customs duty calculator: same math, same trap
Whatever the label on the tool, an import tax calculator, a customs duty calculator, a customs tax calculator, they all hinge on the same input: the tariff code. Feed any of them the wrong code and the output is confidently wrong, because the rate belongs to the code, not to the product name. Two near-identical products can sit percentage points apart: a cotton t-shirt at 16.5 percent into the US, its polyester twin at 32 percent. That is why this page classifies first and calculates second.
What the estimate includes, and what it leaves out
The result above covers the general-rate duty for the destination and its standard import VAT or GST, computed exactly on the value you enter. It flags, but does not silently bake in, origin-specific surcharges such as additional US tariffs on Chinese-origin goods, and it excludes freight, insurance, brokerage and port fees. For the full per-unit truth, carry the duty into the landed cost calculator. Every figure is an AI best-effort estimate for guidance, not a binding ruling: verify the rate before you file.
When the duty number is worth real money
Pricing an international product line, quoting a DDP shipment, deciding between two suppliers in different countries, or budgeting a container before you commit: in each case the duty estimate changes the decision, and getting it early is worth far more than getting it after the goods have shipped. Teams that do this weekly keep every classification and its duty on file; that is what early access unlocks, with saved history, bulk CSV runs and an audit trail.