US tariff calculator — real rates, real overlays.
Pulls live MFN rates from the USITC HTSUS REST API, then layers Section 232 steel/aluminum/copper, Section 301 China lists, and the Section 122 reciprocal baseline. AD/CVD pointer included.
No invented rates.
The MFN rate comes directly from the USITC public REST API at hts.usitc.gov/reststop/search. Section overlays come from a maintained config file (USTR Section 301, CBP CSMS bulletins for Section 232, Federal Register for Section 122). Every overlay surfaces a source URL you can click and verify.
- MFN rate inherited from the most-specific HTSUS line with a non-empty rate (10-digit lines often inherit from 8-digit parents).
- FTA preferences applied automatically when the origin matches a special-rate program code (USMCA, KORUS, USSFTA, AUSFTA, US-CL, US-CO, etc.).
- Section 232 steel/aluminum at the 2018 Proclamation 9705/9704 rates; copper at the April 6, 2026 expansion (50% semi-finished).
- Section 301 China List 3 modeled at the 25% rate. Granted exclusions are NOT pre-applied — confirm with your broker.
- Section 122 reciprocal baseline (10%) applied to non-FTA origins; USMCA + bilateral FTA partners exempt.
- IEEPA tariffs are not charged — they were invalidated Feb 20, 2026 (Learning Resources v Trump). Refunds are available via CBP CAPE.
- AD/CVD is NOT computed — case-number specific. The calculator surfaces a notice when origin × HS chapter has active orders.
This calculator is an estimate. It is not a binding ruling, not a substitute for a customs broker, and not a substitute for the USITC's HTS Search at hts.usitc.gov. For binding classification, file CBP Form 28 / 29 or request a binding ruling at rulings.cbp.gov. Granted Section 301 exclusions, AD/CVD orders, MTB suspensions, and chapter 99 program codes can materially change the duty owed on a specific entry.
Tariff math meets shipment intelligence.
In LIT, every importer profile pre-computes the duty stack against their actual import history — so reps walk into a call knowing the prospect's tariff exposure on every lane.