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HS Code 7403.21 : Copper alloys, Copper-zinc base alloys (brass)

The 6-digit Harmonized System (HS) code for copper alloys, copper-zinc base alloys (brass) is 7403.21. Under the 2026 Singapore (Singapore Customs), the representative MFN general duty rate is 0% [Singapore Customs].

Chapter

Ch 74

Heading

7403

Subheading

7403.21

SG MFN Duty

MODULE 3: SIGNATURE A: HS DECODE VISUAL HIERARCHY

Chapter 74

Refined copper and copper alloys, unwrought (other than master alloys of heading 7405)

Heading 7403

7403

Refined copper and copper alloys, unwrought (other than master alloys of heading 7405)

Subheading .21

.21

Copper alloys, Copper-zinc base alloys (brass)

MODULE 4: SIGNATURE B: TARIFF MATRIX

Import Duty Rates by Destination

Singapore (Singapore Customs / Freeport 2026)

7403.21

Customs Duty (Ad Valorem)

0% (Free Port)

Verified July 2026 · Singapore Customs

MODULE 5: SINGAPORE FREEPORT & GST BREAKDOWN

Customs Duty Rate

0.00 %

Free Port Policy [Customs]

Import GST Rate

9.00 %

CIF + Duty Base [IRAS GST]

De Minimis GST Threshold

None (0.00)

9% GST All Imports

SINGAPORE FREE PORT REGIME

0% customs duty — Singapore is a free port. Standard commercial imports enter customs-duty free, subject only to 9% GST calculated on CIF value.

Notice: Singapore customs clearance, 9% GST assessment, and specific excise duty (liquors, tobacco, petroleum, motor vehicles) are governed by Singapore Customs and IRAS. Verify declarable trade permits at customs.gov.sg prior to import.

TRACK THIS HS CODE

Get Real-Time Tariff & Trade Remedy Change Alerts for HS 7403.21

Receive an automated email notification whenever USITC or CBP publishes duty rate adjustments or customs notices for 7403.21.

MODULE 6: Mandatory Customs Entry Document Matrix

Rule-Derived Customs Entry Package Checklist

UNIVERSAL DOCUMENT

Commercial Invoice

Itemized description, currency, Incoterms, seller/buyer details, and country of origin.

UNIVERSAL DOCUMENT

Packing List & Bill of Lading

Gross/net weight, container/seal numbers, piece count, and transport B/L or Air Waybill.

PREFERENTIAL RULE

Certificate of Origin (If Claiming FTA)

Required only when claiming zero-duty preference under USMCA, KORUS, or GSP.

MODULE 7: Regulatory Compliance & Partner Government Agency (PGA) Flags

Standard Entry This commodity does not carry mandatory PGA pre-clearance flags under the ACE message set.

MODULE 8: SG Trade Remedies & Safeguards

Singapore Customs Anti-Dumping / Trade Defence

Standard 2026 Singapore Free Port Trade Schedule

Steel & Commodity Safeguards

Exempt (Non-Steel Commodity)

Regulatory Compliance Status

Standard Statutory Clearance

MODULE 9: Free Trade Agreements (FTA) & Rules of Origin (RoO)

Browse all preferential trade calculators & compliance tools in our Customs Tools Hub ↗.

Agreement Code	Trade Agreement / Program	Preferential Rate	Rules of Origin (RoO) Requirement
MFN	WCO Most-Favoured-Nation (MFN) Status	Standard MFN Rate	Applies to all WTO member states for Copper alloys, Copper-zinc base alloys (brass).
FTA	SG Preferential & Regional Trade Agreements	Free / Concessional	Subject to official Certificate of Origin & Rules of Origin (RoO) requirements.

MODULE 10: Logistics, Freight & Transport Specifications

Standard 20ft Container

~28 CBM / 28,000 kg Payload

Standard 40ft High-Cube

~68 CBM / 28,600 kg Payload

Stowage Factor & Handling

Standard commercial packaging for Copper alloys, Copper-zinc base alloys (brass)

MODULE 11: Singapore Customs Advance Tariff Ruling

Legally binding advance classification rulings issued by Singapore Customs for HS 7403.21.

Query official Singapore Customs portal:

Search Official Singapore Customs Portal for 7403.21 →

Singapore Declarable Tariff Lines (7403.21)

National line-level (8/10-digit) detail for Singapore (Singapore Customs): coverage in progress.

Universal 6-digit WCO backbone applied rate: 0%. Confirm the full national commodity code at the official source (Singapore Customs).

MODULE 12: Candidate Subheadings & Related Codes

Related HS Code	Heading Category	Action
7403.11	Subheading under Heading 7403	HS 7403.11 undefined Duty & Entry Rules →
7403.12	Subheading under Heading 7403	HS 7403.12 undefined Duty & Entry Rules →
7403.13	Subheading under Heading 7403	HS 7403.13 undefined Duty & Entry Rules →
7403.19	Subheading under Heading 7403	HS 7403.19 undefined Duty & Entry Rules →

Official Primary Sources & Authority References

Singapore Customs Official Trade Portal ↗

Official Singapore free port schedule, GST 9% rules, and dutiable goods excise rates.

Singapore Customs Advance Classification Ruling System ↗

Singapore Customs binding advance tariff classification rulings database.

MODULE 14: Frequently Asked Questions (FAQ) & Operational Guide

What is the 6-digit WCO tariff classification and Singapore (Singapore Customs) general duty for Copper alloys, Copper-zinc base alloys (brass)?

Under WCO Harmonized System 2022 and Singapore (Singapore Customs), Copper alloys, Copper-zinc base alloys (brass) is classified under HS 7403.21 (Heading 7403, Chapter 74). The representative SG MFN general duty rate is 0%.

How is HS 7403.21 distinguished within Heading 7403 (Refined copper and copper alloys, unwrought (other than master alloys of heading 7405))?

Heading 7403 covers Refined copper and copper alloys, unwrought (other than master alloys of heading 7405). Subheading 7403.21 specifically isolates Copper alloys, Copper-zinc base alloys (brass). Importers must verify whether physical characteristics, processing state, or composition require alternative subheadings under Heading 7403.

What are the primary candidate subheadings related to HS 7403.21?

Related subheadings under Heading 7403 include 7403.11, 7403.12, 7403.13, 7403.19, 7403.22, 7403.29. Classification depends on processing stage, decaffeination, purity, or material form.

What mandatory commercial entry documents are required to import Copper alloys, Copper-zinc base alloys (brass)?

Commercial Invoice (detailing Incoterms, currency, and origin), Packing List, Bill of Lading (or Air Waybill), CBP Form 7501 Entry Summary, and a continuous customs bond are required for formal entries.

Can goods under HS 7403.21 enter duty-free under USMCA or Free Trade Agreements?

Yes. Eligible goods originating in Mexico, Canada, South Korea, or Australia enter duty-free under preference SPI codes (P, KR, AU) provided they satisfy Regional Value Content (RVC) or tariff-shift rules with a valid Certificate of Origin.

What is the US formal entry threshold for shipments of Copper alloys, Copper-zinc base alloys (brass)?

Commercial shipments of Copper alloys, Copper-zinc base alloys (brass) with a customs value exceeding $2,500 USD require formal customs entry (CBP Form 7501) and a continuous entry bond. Informal entry applies to lower values.

How can an importer obtain a binding CBP classification ruling for HS 7403.21?

Importers may submit an e-Ruling request under 19 CFR Part 177 to CBP National Commodity Specialist Division (NCSD) to obtain a legally binding tariff classification ruling prior to importation.

Does Singapore levy customs duty on imports of HS 7403.21?

Singapore is a free port and levies 0% ad-valorem customs duty on virtually all goods. However, a 9% Goods and Services Tax (GST) applies to all imports, and specific excise duty applies to alcohol (Ch 22), tobacco (Ch 24), petroleum (Ch 27), and motor vehicles (Ch 87).

What is Singapore's de minimis GST exemption threshold?

Singapore has NO de minimis GST exemption since 2023. All imported goods, including low-value goods (LVG) purchased online, are subject to 9% GST.

Which agency regulates customs entry and GST in Singapore?

Customs permits, 9% GST assessment, and advance tariff classification rulings are administered by Singapore Customs under the Ministry of Finance.

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