Understanding Amazon FBA Fees - Referral, Fulfillment & Storage Costs Breakdown

August 03, 2026 · Seller AI

Diving into Amazon FBA (Fulfillment by Amazon) can be daunting, particularly when trying to understand the intricate fee structure. This guide breaks down the costs per unit, focusing on referral, fulfillment, and storage fees.

Amazon FBA is a game-changer for many sellers, but navigating the fee structure can be confusing. Let's take a closer look at the three main types of fees you'll encounter as an FBA seller: referral fees, fulfillment fees, and storage fees.

Referral Fees

Referral fees, also known as closing fees, are charged for each product sold. They vary by category and are typically a percentage of the total sales price. For example, for most items, referral fees range from 6% to 20% of the item's sale price. To calculate the referral fee for a product, you can use Amazon's fee previews or find the fee percentage for your product category in the seller central dashboard.

Fulfillment Fees

These are the costs Amazon charges for storing, picking, packing, and shipping your items. Fulfillment fees depend on the weight and dimensions of your products and the type of service you choose (standard or expedited). As an example, for a small standard-size item weighing less than 1 lb, the fulfillment fee for orders shipped within the U.S. is $2.50 per unit, plus a $0.30 per additional 0.1 oz charge.

Storage Fees

Storage fees are incurred for holding your inventory in Amazon's fulfillment centers. These fees are charged monthly and are based on the cubic feet your inventory occupies. As of 2026, the monthly inventory storage fee for standard-size items in the U.S. is $0.75 per cubic foot. For long-term storage, fees are charged for items stored beyond 365 days, at a rate of $1.20 per cubic foot.

How to Optimize Your Costs

Understanding these fees is crucial to optimizing your business model. You can look for ways to reduce fulfillment fees by optimizing product packaging, choosing the right product categories, or adjusting your pricing strategy to cover FBA fees. Storage fees can be minimized by managing your inventory effectively, using Amazon's inventory performance dashboard to avoid overage and long-term storage fees.

For Amazon sellers, staying on top of FBA fee changes is a continuous task. Luckily, our AI agents at Seller AI are designed to help you manage and forecast these costs, providing insights based on the latest fee structures and your unique inventory data.