How it works

A duty isn’t value × one rate — it’s a stack of measures, each with its own effective dates and exclusions. StackTariff uses reviewed government-source data and applies those measures in order, so the result is an estimate of what the entered code, origin and value would owe.

The four steps

1. Classify the product. Find the 10-digit HTS code — search the schedule directly, or describe the product and let the AI classifier suggest one with a confidence score.
2. Set origin and value. Enter the country of origin and the customs value. Origin helps decide which Section 301, Section 232, surcharge, trade-remedy or preferential measures apply.
3. Read the stacked duty. The engine layers applicable measures in our dataset — MFN, Section 301, Section 232, temporary surcharge layers, AD/CVD, plus MPF/HMF — using each measure’s effective date.
4. Get the landed cost. Add freight and insurance to see an estimated landed cost, and hand the entry to a licensed customs broker when you’re ready to clear it.

Why the rate is always current

Rates can change quickly. Our dataset is built from sources such as USITC (the HTS codebook), CBP CSMS, and the Federal Register, then every result is stamped with the date it is current as of.

What we don’t do

StackTariff is informational. We don’t file entries or act as your agent before CBP — that’s a licensed customs broker’s role, and we’ll route you to one.

Informational only — not customs advice. Classification and valuation decisions are the importer’s responsibility under 19 USC §1484. For declarations or binding rulings, consult a licensed customs broker.