Amazon FBA Fees Explained: Complete Cost Breakdown for 2026

Understanding Amazon FBA fees is the foundation of a profitable Amazon business. Many sellers launch products, generate sales, and still lose money — simply because they underestimated the true cost of selling through Amazon FBA. In 2026, Amazon updated its fee structure with new size tiers and increased fulfillment rates. This guide gives you a complete, transparent breakdown.

The Three Main Categories of Amazon FBA Fees

1. Fulfillment Fees

Fulfillment fees are charged per unit shipped and cover picking, packing, shipping, and customer service. They are calculated based on the product's size tier and weight. In 2026, Amazon introduced updated size tiers:

• Small standard: Products up to 16oz — fees starting around $3.06/unit
• Large standard: Products 1–20lbs — fees from $3.68 to $6.92/unit
• Large bulky: Oversize items — fees from $9.61+/unit
• Extra-large: Very heavy/large items — fees from $26.33+/unit

Use Amazon's FBA Revenue Calculator to get exact fees for your specific products before sourcing.

2. Monthly Storage Fees

Amazon charges monthly storage fees per cubic foot of inventory stored in their warehouses:

• January–September: $0.78/cubic foot (standard-size) | $0.56/cubic foot (oversize)
• October–December (peak season): $2.40/cubic foot (standard-size) | $1.40/cubic foot (oversize)

Peak season storage fees (Q4) are 3x higher — a critical consideration for inventory planning with your account management team.

3. Amazon Referral Fee

Amazon charges a referral fee on every sale — typically 8–15% of the total sales price depending on category. Most product categories fall at 15%. This is separate from FBA fees and applies to all sellers regardless of fulfillment method.

Additional Fees to Know

Long-Term Storage Fees

Inventory stored over 365 days is subject to long-term storage fees of $6.90/cubic foot or $0.15/unit (whichever is greater). This makes slow-moving inventory extremely costly. Regular IPI (Inventory Performance Index) monitoring is essential — another area where professional account management pays dividends.

Returns Processing Fee

For certain product categories, Amazon charges a returns processing fee when the return rate exceeds a category-specific threshold. This is most common in apparel and footwear.

Aged Inventory Surcharge

In 2024, Amazon introduced an aged inventory surcharge for items stored 181–270 days and 271–365 days. This makes inventory health management more critical than ever.

How to Calculate Your True FBA Profitability

True profit = Sale price - Referral fee - FBA fulfillment fee - Monthly storage allocation - COGS (landed cost) - PPC advertising spend

Most sellers who think they're profitable are actually breaking even or losing money when all FBA costs are properly accounted for. Run the numbers before you source, not after.

Strategies to Minimize FBA Fees

• Optimize product dimensions and packaging to hit a lower size tier
• Use Amazon's removal and disposal service to clear slow-moving inventory before it accumulates long-term storage fees
• Monitor your IPI score weekly and rebalance inventory across fulfillment centers
• Consider FBM for products where FBA fees destroy margin
• Use the TACoS metric to account for ad spend in your total profitability picture

Need help optimizing your FBA cost structure? Contact our team for a free profitability audit — we often find 10–20% margin improvement opportunities in the first 90 days of management.