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 reads those measures from live government feeds and applies them in order, so the number reflects what you’d actually owe today.

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 decides which Section 301 / reciprocal / preferential measures apply.
3. Read the stacked duty. The engine layers every applicable measure — MFN, Section 301, Section 232, IEEPA, reciprocal, AD/CVD, plus MPF/HMF — using each measure’s effective date.
4. Get the landed cost. Add freight and insurance to see your true 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 change weekly. A background service tracks USITC (the HTS codebook), CBP CSMS, and the Federal Register, and pushes changes to the calculator without a redeploy. Every result is stamped with the date it’s 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 binding rulings, file CBP Form 19; for declarations, consult a licensed customs broker.