Section 301 tariffs add 25% to most CNC machined metal and plastic parts imported from China. That duty stacks on top of a temporary Section 122 surcharge and the standard Most Favored Nation (MFN) rate.
This guide breaks down what applies to CNC machined parts today, what changed under the 2026 tariff rulings, and how buyers can manage the cost impact. The importer of record is typically the U.S.-based buyer, not the manufacturer. That buyer carries legal responsibility for duty payment and classification accuracy, which is why this tariff stack belongs in sourcing decisions, not just customs paperwork.
What Section 301 Tariffs Apply to CNC Machined Parts?
The table below summarizes the tariff layers currently stacking on China-origin CNC machined parts, as of July 2026. Rates and effective dates in this area move fast, so treat these as a snapshot to confirm before you finalize any landed-cost estimate.
| Tariff Layer | Applies To | Current Rate | Status |
|---|---|---|---|
| MFN base duty | All CNC machined parts | 0% to 3.5%, by HTS code | Permanent |
| Section 301 (Lists 1–3) | Machine parts, mechanical appliances, steel/iron articles | 25% | Permanent since 2018 |
| Section 122 surcharge | Nearly all countries of origin | 10% | Expires July 24, 2026 |
| Section 232 (steel/aluminum) | Parts with covered steel or aluminum content | Up to 50%, by material | Permanent, applied separately |
Most CNC machined components fall under Harmonized Tariff Schedule (HTS) Chapter 84 or Chapter 73. The right chapter depends on the part’s function and material. Machine parts and accessories under HTS 8466 sit on Section 301 List 1. Mechanical appliances under HTS 8479 usually land on List 1 or List 2, both carrying a 25% additional duty.
Fabricated steel and iron articles under HTS 7326 typically fall under List 3, also currently at 25%. Parts with significant steel or aluminum content can also draw a separate Section 232 duty of up to 50% on the metal value. Section 232 goods are excluded from the Section 122 surcharge, so those two layers don’t stack on the same part.
The U.S. Trade Representative (USTR) first imposed these duties in 2018, and the Federal Circuit upheld the tariffs in September 2025. The Supreme Court then declined to review a separate challenge in June 2026. Section 301 duties on CNC machined parts remain fully in effect, regardless of the litigation reshaping the other tariff programs below.
Consider a $10,000 order of CNC machined parts classified under HTS 8479. At a 25% Section 301 rate plus the current 10% Section 122 surcharge, the buyer owes roughly $3,500 in additional duty. That’s before any MFN rate or freight costs and represents a close to 35% jump in landed cost. The math shifts again once the Section 122 surcharge expires or is replaced, which is exactly why the next section matters.
What Changed in the 2026 Tariff Update?
The tariff picture for CNC machined parts shifted sharply on February 20, 2026, when the Supreme Court ruled that the International Emergency Economic Powers Act (IEEPA) doesn’t authorize the president to impose tariffs. That ruling struck down the broad reciprocal tariffs and the separate emergency duties applied to Chinese imports since 2025. It left Section 301, Section 232, and antidumping and countervailing duty orders untouched.
Hours after the ruling, the administration invoked Section 122 of the Trade Act of 1974. This is a balance-of-payments authority capped at a 15% surcharge for no more than 150 days without congressional extension. A 10% global surcharge took effect on February 24, 2026. It applies to Chinese-origin CNC parts in addition to Section 301 duties, though parts already covered by Section 232 are excluded.
That surcharge expires July 24, 2026, exactly 150 days after it began, unless Congress extends it, which isn’t considered likely. USTR has proposed a replacement under a separate Section 301 investigation into forced-labor and excess-capacity practices. The proposal covers duties of 10% to 12.5% across roughly 46 countries, including China. USTR hadn’t finalized that action as of this writing, so confirm the current rate at USTR.gov or CBP.gov before finalizing a landed-cost estimate.
Practically, this means the rate a buyer pays on a China CNC order placed this week may not be the rate that applies once parts ship. A short buffer in landed-cost math is a reasonable hedge until the replacement tariff is finalized.
What is the Current Status of the $800 De Minimis Rule?
The $800 de minimis exemption no longer applies to shipments from China or from any other country. It ended for China and Hong Kong on May 2, 2025. The exemption ended for every remaining country on August 29, 2025, closing a loophole that had let low-value parcels enter duty-free.
U.S. Customs and Border Protection (CBP) made that suspension indefinite through federal rulemaking effective June 24, 2026, with a statutory repeal scheduled for July 1, 2027. Every commercial shipment of CNC machined parts from China now needs a formal customs entry and duty payment, regardless of declared value.
This closes a workaround some buyers previously used for low-value prototype or sample shipments. Sample parts, spare components, and small prototype batches now carry the same duty exposure as full production orders. It’s worth building duty costs into sample budgets rather than treating them as a free trial.
CBP pointed to volume and visibility, not just revenue, as the reason for eliminating the exemption rather than reforming it. The agency processed more than 1.36 billion de minimis shipments in fiscal year 2024 alone, with limited data on what many of those parcels actually contained.
How does HTS Classification Affect Your Tariff Exposure?
The same physical part can fall under different HTS codes, depending on its function, material, and intended end use. The code selected determines which Section 301 list and rate applies. A machined aluminum bracket sold as a standalone mechanical part can be classified differently than the identical bracket built as a dedicated component of a larger machine.
Misclassification carries real financial risk. It can trigger back duties, penalties, and shipment delays discovered well after parts have already shipped. Buyers placing high-volume or recurring China CNC orders should request a binding ruling from CBP. A binding ruling locks in the correct classification for future entries and removes the guesswork from repeat orders.
A binding ruling request typically takes several weeks to process. It requires a detailed product description, material specification, and intended end use. Submit a request well before a large order is finalized, not after parts are already in transit.
How Can You Manage Tariff Exposure When Sourcing CNC Parts From China?
First-sale valuation lets importers calculate duties on the earlier manufacturer-to-intermediary price, rather than the final resale price. This applies when a multi-tiered supply chain and proper documentation support it. It can meaningfully lower the dutiable value on parts that pass through a trading company before reaching the final buyer.
Bonded warehouses and Foreign-Trade Zones (FTZs) both defer duty payment until goods leave the facility. This helps buyers manage cash flow on large inventory positions. A bonded warehouse can hold imported parts duty-free for up to 5 years. Goods stored in an FTZ can be re-exported without any duty payment at all.
Neither tool eliminates the underlying tariff, and each carries its own compliance and bonding requirements. Working with a supplier that provides complete, accurate commercial documentation reduces the chance that a routine customs question turns into a shipment delay.
Entry timing matters too, since duty rates are set by the date of entry rather than the ship date. Coordinating production completion and freight booking around a scheduled rate change, such as the July 24, 2026 Section 122 sunset, can shift a shipment from one rate environment into another.
How does XTJ CNC Support Customs Documentation?
XTJ CNC has manufactured and shipped custom CNC machined parts to buyers worldwide for 20+ years, so our export documentation is set up to support accurate customs entries. Every order ships with a detailed commercial invoice, material certifications, and full traceability from raw material to finished batch. Those are the records an importer or customs broker relies on to classify parts correctly and document dutiable value.
Please note that this is documentation support, not customs brokerage or legal advice. Classification decisions and duty payment stay with the buyer as the importer of record.
To get a landed-cost picture before committing to a production run, request a quote you can drop straight into your landed-cost math.
China Cnc Machining Tariffs FAQs
Do Section 301 tariffs apply to CNC machined parts from China?
Yes. Most CNC machined metal and plastic parts, classified under HTS Chapter 84 or Chapter 73, carry a 25% Section 301 duty. That’s on top of the standard MFN rate and any temporary surcharge currently in effect.
What is the $800 de minimis rule?
The $800 de minimis rule lets shipments valued at $800 or less enter the United States duty-free. It no longer applies to any country of origin, including China, as of August 29, 2025. CBP made that suspension indefinite in June 2026.
How can I reduce tariff costs on CNC parts from China?
Request a CBP binding ruling to confirm the correct HTS classification. Explore first-sale valuation where a qualifying supply chain exists. Consider a bonded warehouse or FTZ to defer duty payment on inventory. None of these strategies eliminates the tariff outright, and a licensed customs broker can confirm which options fit a specific import program.
What HTS code applies to CNC machined parts?
It depends on the part’s function and material. Machine parts and accessories fall under HTS 8466. Mechanical appliances fall under HTS 8479. Fabricated steel or iron articles fall under HTS 7326. The exact 10-digit subheading determines the applicable Section 301 list and rate.
Will tariff rates on CNC parts from China change again in 2026?
Likely, yes. The temporary Section 122 surcharge expires on July 24, 2026. USTR’s proposed replacement hadn’t been finalized as of this writing. Buyers with orders in transit or pending should confirm current rates at USTR.gov or CBP.gov before finalizing a landed-cost calculation.
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