Always Up to Date
The full Harmonized Tariff Schedule refreshes hourly from the official USITC feed — and watches track new actions before they take effect.
Tariff data goes stale fast in a year when actions land weekly. Tariff Monster ingests the official USITC schedule every hour, revision by revision, so the moment a new HTS revision publishes, its lines, rates, and Chapter 99 changes flow into the engine. Federal Register and CBP watches run alongside the feed, flagging announced actions while they are still upcoming so they can be curated ahead of their effective dates.
Freshness without verification is just speed, so every revision runs the gauntlet: a suite of pinned benchmark quotes — real codes, real countries, real expected totals — recomputes on every ingest, and any change in any pinned result is surfaced for review before it can silently alter a broker’s quote. New tariff headings the parser hasn’t seen before are queued for human curation the same day they appear. For the full picture — the watchers, the regression gauntlet, and live production numbers — see Live Data Integrity.
Hourly Ingestion
The official USITC feed is polled every hour. New revisions are parsed, diffed against the prior one, and live in the engine the same day they publish.
Federal Register & CBP Data
Announced actions are tracked before they take effect, so upcoming duties are curated with their effective dates — not discovered after the fact.
Benchmarked Every Change
Dozens of pinned reference quotes re-run on every revision. If a stored result moves, a human sees it before your quotes do.