HS (Harmonized System) code is an internationally standardized product classification system developed by the World Customs Organization (WCO), adopted by over 200 countries. It consists of 6 digits globally, with countries extending to 10 digits (e.g., US HTS 10-digit, UK Commodity Code 10-digit, China HS 10-digit).

How accurate is AI HS code classification?

HSBot is built on official customs policy and real customs data. For common products, classification accuracy exceeds 95%. AI results are for reference only—actual declarations should be verified with customs authorities. Combining product details (material, usage, composition) improves accuracy.

What countries does HSBot support?

HSBot currently supports US HTS codes and UK tariff codes (import classification) and China HS codes (export classification), covering the most common China-US and China-UK trade scenarios. More countries including EU, Japan, Vietnam, and Mexico are coming soon.

How many free queries do I get per day?

Free users can make 20 classification queries per day. The quota resets at 00:00 Beijing time daily. Contact us for enterprise plans with higher limits and API access.

What is Section 232 tariff?

Section 232 tariff is an additional US import duty on steel, aluminum, and copper products based on national security grounds. HSBot automatically calculates applicable Section 232 rates based on HS code prefixes and exporting country.

What is Section 301 tariff?

Section 301 tariff is an additional US import duty on certain products from China, in response to trade practices. HSBot automatically identifies applicable Section 301 rates and checks for tariff exclusions.

Why did an HTS code that worked last year stop working?

US HTS schedules are revised several times a year by U.S. Customs and Border Protection. Most changes land at the 10-digit statistical level — a subheading is added, merged, or renumbered — so a code that was valid last season may no longer exist, or now maps to a different rate. The 6-digit HS number usually stays stable because it is set internationally, but the extra 4 U.S. digits are where revisions bite.

How often is the HTS updated?

Multiple times per year. CBP publishes revisions on a rolling basis, not one annual drop, so a code can become stale at any point. Importers who copy a code from an old spreadsheet or a year-old blog post are the ones most likely to hit a dead code at the border.

Is the 6-digit HS code stable across revisions?

Largely yes. The first 6 digits are the international HS, coordinated through the WCO, and change far less often. The last 4 digits are the U.S.-specific HTS layer and that is where annual revisions happen. If your 6-digit base is right you are usually close; you then re-confirm the 10-digit suffix against the current schedule.

How do I know which HTS revision is currently in force?

Use a source that syncs to the live schedule rather than a static table. HSBot continuously syncs with the latest schedules published by each country's customs and tariff authorities, so the code you look up reflects the version currently in force. The exact revision in effect and supported countries are published in the Data version & sources section of the HSBot Help Center (/en/help#data-version) — the single authoritative reference site-wide.

If my product did not change, do I need a new code?

Not necessarily — but the schedule might have. A code can be retired or renumbered even when your goods are identical, which means you must re-map to whatever the current schedule calls it. Never assume last year's code is still valid; re-verify before a shipment, especially after a long gap.

Why Your Old US HTS Code Suddenly Stops Working (Annual HTS Revisions)

Short answer: U.S. HTS codes are not carved in stone. The schedule is revised several times a year, and almost all changes happen at the 10-digit level — the four U.S.-specific digits after the international 6-digit HS. A code that cleared customs last season can be retired, merged, or renumbered this season, so a stale code gets rejected, re-rated, or flagged. The fix is simple: re-verify the code against the current schedule before each shipment instead of trusting a code copied from last year.

What actually changes, and what stays put

An HTS code has two halves with very different stability:

Part of the code	Set by	How often it changes
First 6 digits (HS)	WCO, international	Rarely — coordinated globally
Last 4 digits (U.S. HTS suffix)	U.S. CBP	Several times a year

So when an "old code stops working," it is almost never the product category moving — it is the U.S. suffix being revised. The international 6-digit base is usually still fine; you just need to re-confirm the suffix against the live schedule.

Why a dead code hurts more than you think

Shipping against a stale 10-digit code can trigger:

Rejection at entry — CBP cannot match the code to the current schedule.
Re-rating — the retired code's replacement may carry a different duty rate, including a higher one.
Liquidated damages / penalties — a wrong or nonexistent code is treated as a classification error, not a typo.
Delays — manual review holds the shipment while the code is fixed.

None of these require your product to have changed. A silent schedule revision is enough.

The pattern that keeps biting importers

The most common failure path is mundane:

Someone found the right HTS code two years ago.
It got copied into a spreadsheet, an ERP field, or a "standard product template."
The schedule was revised in the meantime — the suffix retired or renumbered.
The next shipment reuses the old code and gets flagged.

Templates and blog posts age. The schedule does not wait for them.

How to stop shipping against a stale code

Re-verify before each shipment, not just the first time. A long gap between orders is exactly when a revision has likely landed.
Trust a live source over a static one. A code looked up against the current schedule beats a code copied from a year-old "2026 tariff quick-reference" table — those tables are themselves a maintenance trap the moment a new revision ships.
Anchor on the 6-digit HS, then confirm the suffix. The international base is your stable reference; re-map the U.S. 10-digit suffix to whatever the current schedule calls it.
Keep one authoritative reference. For HSBot users, the Help Center's Data version & sources is the single place that states the revision in force — no article, spreadsheet, or screenshot should be treated as the source of truth.

How HSBot fits

HSBot resolves the full 10-digit HTS from a product description and syncs to the latest schedule published by customs, so the code you get reflects the version currently in force rather than a cached value. For looking up a code from a known description, see the US HTS code lookup guide. The point is not that HSBot never needs re-checking — it is that the re-check happens against live data, so you are never one revision behind.

Quick takeaways

HTS revisions are multiple per year, at the 10-digit level — not one annual event.
The 6-digit HS is internationally stable; the 4-digit U.S. suffix is where codes die.
A dead code is a classification error even if your product never changed.
Re-verify per shipment; treat any static "quick-reference" table as already aging.

Disclaimer: This article explains how HTS revision mechanics work for planning purposes, not legal or customs-compliance advice. HTS structures, revision timing, and duty rates change; confirm the current code and rate with U.S. CBP or a licensed customs broker before filing an entry.