Overview

Amazon's FBA fee structure in 2025 layers multiple charges on top of each other — referral commissions, per-unit fulfillment costs, seasonal storage rates, and newer penalties for low inventory and inbound placement. For sellers trying to protect margins while staying competitive on price, understanding every component of this fee stack is essential to running a profitable operation.

What Makes Up the 2025 FBA Fee Stack

• Referral fees — A percentage-based commission on every sale, typically 8% to 15% depending on category, with minimum thresholds that hit low-priced items hardest.
• Fulfillment fees — Per-unit charges covering pick, pack, and ship, calculated by size tier and shipping weight.
• Monthly storage fees — Cubic-footage charges that range from about $0.78 off-peak to $2.40 per cubic foot during Q4.
• Inbound placement service fee — A charge applied when Amazon redistributes inventory across fulfillment centers after a seller ships to a single location.
• Low inventory level fee — A surcharge triggered when stock falls below Amazon's recommended levels relative to sales velocity.
• Aged inventory surcharge — Escalating penalties on units stored beyond 181, 271, and 365 days.

Referral Fees and the Low-Price Trap

Every Amazon sale begins with a referral fee — the marketplace's cut for giving sellers access to its customer base. Most categories fall in the 8% to 15% range, but the real pain point for many sellers is the per-item minimum fee on lower-priced products. Items sold under $10 can face a flat minimum that takes a disproportionately large bite out of already thin margins. Sellers should model category-specific referral rates into their unit economics before sourcing any new product, paying particular attention to how minimums affect profitability on budget-priced goods.

Fulfillment Fees and the Size Tier Game

FBA fulfillment fees cover the operational costs of picking, packing, and shipping each order. These are tiered by product dimensions and weight, with standard-size items (generally under 20 pounds within specific dimensional limits) enjoying lower rates than oversize products. Amazon periodically adjusts its size-tier boundaries, meaning even small changes to packaging can push a product into a more expensive classification overnight. For high-volume sellers, investing in packaging optimization — shaving an inch here, reducing weight there — can generate meaningful per-unit savings that compound across thousands of shipments each month.