HTS Code 10 Digit: The Complete Guide

A 10-digit HTS code is the complete product classification number that U.S. Customs and Border Protection requires on every formal import entry. Getting it right determines how much duty you pay, whether trade restrictions apply, and whether your shipment clears without delay.

What Is a 10-Digit HTS Code?

Harmonized Tariff Schedule (HTS) Code: A numeric classification identifier assigned to every traded good under the Harmonized System framework. The U.S. version — the Harmonized Tariff Schedule of the United States (HTSUS) — extends the standard six-digit international code to ten digits to capture duty rates, statistical tracking categories, and trade program eligibility specific to the United States.

The full 10-digit number looks like this: 6403.91.6045

Every digit carries meaning. None are arbitrary. The code tells CBP exactly what the product is, where it fits in U.S. trade law, and what rate of duty applies the moment it arrives at a port of entry.

According to CBP, more than 400 million entry lines are processed annually through the Automated Commercial Environment (ACE) portal — every single one requires a valid HTS classification. The World Customs Organization (WCO) reports that over 98% of global merchandise trade is classified under the international Harmonized System that underpins those codes. Misclassification is the single most common customs compliance error, and it’s also one of the most expensive to fix after the fact.

How a 10-Digit HTS Code Is Structured

The 10 digits break into four distinct layers. Understanding the layers is the fastest way to read any HTS code confidently.

Layer 1: Chapter (Digits 1–2)

The HTSUS contains 99 chapters organized into 22 sections. Chapters 1–97 cover actual goods; chapters 98–99 cover special tariff provisions. The first two digits tell you the chapter.

• 64 = Footwear, gaiters, and the like

Layer 2: Heading (Digits 3–4)

Within each chapter, headings subdivide goods into broad product groups. These four digits together form the “heading.”

• 6403 = Footwear with outer soles of rubber, plastics, leather, or composition leather, and uppers of leather

Layer 3: Subheading (Digits 5–6)

The fifth and sixth digits create the subheading — this is where the international Harmonized System ends. Every WCO member country agrees on digits 1 through 6.

• 6403.91 = Footwear covering the ankle

Layer 4: U.S.-Specific Suffix (Digits 7–10)

Digits 7 and 8 form the U.S. rate line (where the actual duty rate lives). Digits 9 and 10 are the statistical suffix — used for trade data collection and sometimes for distinguishing between products subject to different trade orders.

• 6403.91.60 = Men’s footwear covering the ankle, valued over $2.50 per pair
• 6403.91.6045 = The full statistical suffix identifying a specific gender/material/value combination

The critical takeaway: only digits 1–6 are globally harmonized. When you export to Canada, Germany, or Japan, their tariff systems share those first six digits with yours — but digits 7–10 will differ. For U.S. Customs purposes, all 10 digits are required.

The Legal Framework: Where HTS Code Requirements Come From

The requirement to classify goods isn’t a bureaucratic preference. It’s grounded in federal statute and regulation.

19 USC 1484 requires the importer of record to “use reasonable care” in making entry, which explicitly includes accurate classification and valuation. This is the legal foundation for why classification errors can generate penalties — the duty to classify correctly sits with the importer, not CBP.

19 CFR Part 141 covers the mechanics of entry, including the obligation to provide a complete and accurate Entry Summary (CBP Form 7501). Line 28 of that form is where the 10-digit HTS number appears.

19 USC 1592 is the penalty statute. It creates three tiers of liability based on culpability:

• Fraud: Penalty up to the domestic value of the merchandise
• Gross negligence: Penalty up to four times the unpaid duties
• Negligence: Penalty up to two times the unpaid duties

Even an honest classification mistake qualifies as negligence if you didn’t take “reasonable care” — which CBP defines, in part, as consulting an expert or obtaining a binding ruling for complex goods.

The HTSUS itself is published and maintained by the U.S. International Trade Commission (USITC) and is updated on a roughly annual basis. The current, legally authoritative version is always available at hts.usitc.gov.

How to Find the Right 10-Digit HTS Code: A Step-by-Step Process

Classification isn’t guesswork. It follows a defined logical process rooted in the General Rules of Interpretation (GRIs) — six rules that appear at the front of the HTSUS and govern how any product is classified when the answer isn’t immediately obvious.

Step 1: Describe the product precisely. Write down what the product is made of, what it does, how it’s used, and how it arrives (finished, unfinished, in bulk, in sets). The more specific, the better.

Step 2: Identify the likely chapter. Use the HTSUS section and chapter notes at hts.usitc.gov. Each section and chapter has legal notes that define scope and exclusions — read them before you assume a product belongs in a chapter.

Step 3: Find the correct heading. Within your chapter, read the heading descriptions. GRI 1 says classification is determined first by the terms of the headings and any section or chapter notes. If a heading specifically describes your product, that’s your heading.

Step 4: Apply the subheading. Once you have a heading, move to the subheading level (6 digits). Subheadings are compared only within the same heading — don’t jump across headings to find a “better fit.”

Step 5: Identify the U.S. rate line and statistical suffix. Extend to 8 digits (rate line), then 10 digits (statistical suffix). The duty rate, any special program rates (GSP, USMCA, etc.), and any Column 2 rates for non-market economies all appear at this level.

Step 6: Check for additional trade measures. Search enforcement.trade.gov/adcvd to verify whether your product is subject to antidumping (AD) or countervailing duty (CVD) orders. Also check CBP’s Section 301 tariff lists (China tariffs) — these are applied on top of the base rate and are keyed to 10-digit HTS codes.

Step 7: Request a binding ruling if unsure. For products that could reasonably fall into two or more classifications, submit a ruling request at rulings.cbp.gov. CBP is required to respond within 30 days for most requests. A binding ruling gives you a classification you can legally rely on.

Real-World Classification Examples

Abstract rules are easier to apply when you see them in action.

Example 1: Athletic Shoes A company imports running shoes with rubber soles and synthetic textile uppers. The importer initially classifies them under 6404.11 (sports footwear with outer soles of rubber and uppers of textile). CBP review confirms this is correct — the base duty rate is 20%. Had the importer used the leather-upper heading (6403) incorrectly, the duty rate would have been different and the entry would have been flagged for correction at liquidation.

Example 2: Lithium-Ion Battery Packs An electronics importer brings in battery packs for laptop computers. These could potentially classify under Chapter 85 (electrical machinery) at heading 8507 (electric accumulators) or as parts of laptops under 8473. The GRI 1 analysis, supported by a binding ruling, confirms 8507.60 — the specific heading for lithium-ion accumulators. This matters because Section 301 China tariffs apply to 8507.60 at 25%, not to 8473.

Example 3: Frozen Prepared Meals A food importer brings in frozen chicken tikka masala. Classification between 1602 (other prepared meat) and 2106 (miscellaneous food preparations) turns on the percentage of chicken versus sauce in the product. The correct 10-digit code affects both the base duty rate and whether FDA Prior Notice is required — a compliance step that goes beyond CBP. Specialty food and beverage customs brokers routinely handle exactly these layered determinations.

Example 4: Automotive Parts An auto parts importer classifies brake pads under 8708.30 (brakes and servo-brakes) rather than 6813 (friction material). The error is caught during a CBP CF-28 Request for Information. The correct 10-digit code under 6813.81.0000 carries a different duty rate and is also subject to a separate antidumping order. Automotive imports are one of the highest-risk categories for classification disputes — which is why working with automotive specialty customs brokers is common practice.

Common Mistakes and Misconceptions

Mistake 1: Using only 6 digits. The international HS code ends at 6 digits. The Schedule B number (used for U.S. exports) is also 10 digits but is maintained by the Census Bureau, not USITC — and it is not the same as the HTSUS import code. CBP requires all 10 digits on import entry. Submitting a 6-digit code on Form 7501 will generate an ACE edit error and delay your entry.

Mistake 2: Copying the supplier’s HS code. Your overseas supplier provides an HS code based on their country’s tariff schedule. The first six digits usually match, but digits 7–10 won’t. More importantly, classification is the importer of record’s legal responsibility under 19 USC 1484 — you cannot outsource that liability to a foreign seller.

Mistake 3: Assuming last year’s code still applies. The HTSUS is updated periodically. New tariff lines are added, statistical suffixes change, and Section 301 tariff lists are amended by U.S. Trade Representative action. A code that was correct in 2022 may have split into two codes in the current schedule. Always verify against the current published HTSUS at hts.usitc.gov.

Mistake 4: Ignoring chapter and section notes. The legal notes at the beginning of each section and chapter define what is and isn’t included. A product that looks like it belongs in Chapter 84 (machinery) may be excluded by a chapter note that routes it to Chapter 85 (electrical machinery). Classification based solely on heading text without reading the notes is one of the most common expert errors, let alone beginner ones.

Mistake 5: Conflating duty rate with classification. Some importers pick the classification with the lowest duty rate and work backward. This is both legally wrong and risky. Classification must follow the product’s actual description and the GRI hierarchy. If an audit reveals you chose a lower-duty code without factual support, the negligence penalty tier applies immediately.

A licensed customs broker can catch all five of these errors before your goods reach the port. You can search all CBP-licensed customs brokers by location and specialty, or browse by U.S. port of entry to find someone who handles your specific trade lane. For more on what brokers actually do during the clearance process, see 10 Core Duties of a Customs Broker Explained.

Tools and Resources for HTS Classification

CBP publishes free “Informed Compliance Publications” (ICPs) for hundreds of product categories — detailed classification guides written by CBP commodity specialists. For pharmaceuticals, chemicals, electronics, and textiles, these publications are invaluable starting points before you consult with a broker. Access them at [