Amazon FBA Import Duties: The Complete Seller's Guide

How FBA Importing Differs from Standard B2B Importing

If you're a brand owner or reseller shipping to Amazon's fulfillment centers, you're doing two things at once: importing goods into the US (a customs transaction with CBP) and delivering inventory to Amazon (a logistics transaction with Amazon). These are completely separate processes, and Amazon handles only the second one.

Amazon is not your customs broker, does not file your customs entry, and is not your importer of record. Every customs obligation — classification, duty payment, ISF filing, entry accuracy — is your responsibility or your broker's. Amazon's involvement begins only when your goods clear customs and arrive at their receiving dock.

The Importer of Record for FBA Shipments

The importer of record (IOR) is the entity legally responsible for the customs entry. For FBA shipments entering the US, you — the seller — are typically the IOR, not Amazon. This means:

• You need a US Employer Identification Number (EIN) or, for foreign sellers, a CBP-assigned importer number
• You need a customs surety bond (annual or single-entry) for formal entries over $2,500
• You're legally responsible for the accuracy of the HTS classification on the entry — not your supplier, not Amazon
• Any CBP audit, penalty, or back-duty assessment comes to you, not Amazon

The FBA Import Flow: Step by Step

When and How Duties Are Paid

Duties are paid at the time of customs entry, before your goods are released from the port. Your customs broker advances the duty payment to CBP on your behalf, then invoices you — typically within 10–14 days of entry. You do not pay duties to Amazon or through Seller Central.

This timing matters for cash flow: you're paying duties before the goods reach an Amazon warehouse, and typically 4–8 weeks before any sale revenue. Factor this into your working capital model, especially for large seasonal orders.

Common FBA Classification Mistakes That Cost Sellers Money

Using the supplier's suggested HTS code without verification

Chinese suppliers routinely suggest HTS codes on commercial invoices. These suggestions are optimized for their export process — not for your US import duties. A code that minimizes Chinese export tax may not be the most favorable code for US import purposes. Always verify the code independently. Use our free HTS lookup as a starting point.

Classifying by primary material instead of function

A product's function — not its primary material — usually determines the correct HTS heading. A silicone spatula is a kitchen utensil (Chapter 39 excludes kitchen utensils, which fall in Chapter 82), not an article of silicone. This classification distinction can mean a duty rate difference of 5–15 percentage points, depending on the specific codes.

Missing Section 301 exposure entirely

Many sellers calculate duties using only the base MFN rate and miss the Section 301 additional duty entirely. If you're sourcing from China, always check whether your HTS code appears on Lists 1–4A. A 25% Section 301 tariff on a high-volume SKU can make a product economically unviable that looked profitable on paper.

Ignoring classification when products evolve

Sellers frequently modify products based on customer feedback — adding a component, changing material, bundling items. Each modification can change the correct HTS classification. A product that was correctly classified 18 months ago may no longer be — especially if components were added that change the product's essential character for GRI purposes.

Using one HTS code for product variations

A product line with multiple materials (cotton vs. polyester versions of the same shirt) or size ranges (children's vs. adults') may require different HTS codes with different duty rates. Filing all variations under one code is a common error that either overpays or underpays duties.

FBA-Specific Cost Reconciliation

For FBA sellers, reconciling import costs against sales data is harder than it should be because the data lives in three places: your freight forwarder's invoices (freight costs), your customs broker's invoices (duties and fees), and Seller Central (revenue and Amazon fees). None of these systems talk to each other automatically.

The minimum reconciliation you should be doing per SKU:

• Landed cost per unit = (factory cost + ocean freight + duties + broker fees + drayage) ÷ units in shipment
• Effective duty rate per unit = (total duties paid ÷ declared customs value) — verify this matches your expected rate
• Duty cost as % of revenue = duties paid ÷ (units × average selling price) — tracks how tariff burden scales with pricing strategy

If your effective duty rate is significantly higher than you expected, it may indicate a classification error that's been compounding over multiple shipments. A full HTS audit can identify whether you've been over-paying and estimate the refund opportunity.

Using a Freight Forwarder vs. Amazon Global Logistics

Amazon Global Logistics (AGL) offers an integrated service that handles ocean freight and customs brokerage for FBA shipments. It's genuinely convenient — one booking interface, one invoice — but it has limitations sellers should understand:

• AGL classifies at volume and speed. Classification optimization (finding a lower-duty alternative code) is not part of the service.
• You have less visibility into the customs entry details — getting copies of your CF 7501s requires explicit requests.
• AGL rates are competitive for standard lanes but may not be the best option for unusual origins, oversized cargo, or time-sensitive air freight.

For sellers with straightforward supply chains and low SKU counts, AGL is a reasonable starting point. As volume grows and classification complexity increases, a dedicated customs broker who can optimize your entries becomes more valuable.

Next Steps for FBA Sellers

If you're importing into FBA and haven't verified your HTS classifications recently, start with our free HTS lookup tool — enter your product description and see your current code, base duty rate, and Section 301 status in seconds. If you want to know whether better alternatives exist, run a full audit with CBP ruling citations and savings estimates. Your first 2 audits are free.