Amazon FBA Guide: Everything You Need to Know About Fulfillment by Amazon

Fulfillment by Amazon (FBA) is the backbone of most successful Amazon businesses. By leveraging Amazon's world-class logistics network, brands can offer Prime shipping, reduce operational complexity, and focus on growing their business. This guide covers everything you need to know about FBA in 2026.

What is Amazon FBA?

Fulfillment by Amazon (FBA) is a service where you send your products to Amazon's fulfillment centers, and Amazon handles storage, picking, packing, shipping, and customer service. When a customer orders your product, Amazon ships it directly from their warehouse, often with Prime two-day or same-day delivery.

For brands we manage at Marknology, FBA is almost always the recommended fulfillment method. The Prime badge alone can increase conversion rates by 25 to 50%, making it one of the highest-ROI decisions a seller can make.

How Amazon FBA Works: Step by Step

1. Create your listings. Set up your product listings in Seller Central with optimized titles, images, and descriptions.
2. Prepare your inventory. Label products with FNSKU barcodes, package them according to Amazon's requirements, and create a shipping plan.
3. Ship to Amazon. Send your inventory to Amazon's designated fulfillment centers. Amazon determines which warehouses receive your products based on demand forecasting.
4. Amazon stores your products. Your inventory is stored in Amazon's warehouses until a customer places an order.
5. Customer orders. When a customer buys your product, Amazon picks it from the shelf, packs it, and ships it.
6. Amazon handles returns. Customer service, returns processing, and refunds are managed by Amazon.

FBA Fees Breakdown

Understanding FBA costs is critical for pricing and profitability. Here are the main fee categories: Learn more in our listing optimization strategies.

Fulfillment Fees

Charged per unit sold, based on product size and weight. For standard-size items (under 18" x 14" x 8" and under 20 lbs), fees start around $3.22 for small items and scale up with size and weight. Oversize items have higher fees.

Monthly Storage Fees

Charged per cubic foot of space your inventory occupies. Standard rates are approximately $0.87 per cubic foot (January through September) and $2.40 per cubic foot during Q4 (October through December). Long-term storage fees apply to inventory stored over 181 days.

Other Fees

• Removal and disposal fees: If you need to remove unsold inventory.
• Long-term storage surcharges: For inventory aged 181 to 365 days and 365+ days.
• Unplanned prep fees: If your shipments arrive not properly prepped.
• Labeling fees: If Amazon labels your products for you ($0.55 per unit).

Calculating Your True FBA Cost

To determine if FBA makes financial sense, calculate your total cost per unit: product cost + shipping to Amazon + FBA fulfillment fee + prorated storage + referral fee. Compare this against your selling price to determine margin. Most successful FBA products maintain at least a 30% margin after all fees.

FBA Prep Requirements

Amazon has strict requirements for how products must be prepared before arriving at their fulfillment centers. Non-compliance results in refused shipments or additional charges.

Labeling

Every unit must have a scannable FNSKU barcode. You can print and apply labels yourself, use a 3PL prep service, or pay Amazon to label for you. Self-labeling is cheapest but most time-consuming.

Packaging Requirements

• Poly bagging: Required for products with multiple loose parts, fabric items, and anything that could be damaged or contaminated. Bags must have a suffocation warning.
• Bubble wrap: Required for fragile items. Must have at least 2 inches of bubble wrap on all sides.
• Overboxing: Products in packaging that could be damaged need to be placed in a protective outer box.
• Sets and bundles: Multi-pack items must be clearly marked "sold as set" or "do not separate."

Shipping Plans

When creating a shipping plan in Seller Central, Amazon may split your inventory across multiple fulfillment centers. You can enroll in the Inventory Placement Service (for an additional fee) to send everything to one location and let Amazon distribute internally.

FBA vs FBM: Which is Right for Your Business?

Fulfillment by Merchant (FBM) means you handle storage and shipping yourself. Here is how the two models compare:

Choose FBA When:

• Your products are standard-sized and not excessively heavy
• You want the Prime badge for higher conversion rates
• You do not have warehouse space or fulfillment staff
• You sell high-volume products that benefit from Amazon's shipping speed
• Customer service management is not your strength

Choose FBM When:

• Your products are oversized and FBA fees are prohibitive
• You have existing warehouse infrastructure with competitive shipping rates
• Your products require special handling or customization
• You sell low-margin products where FBA fees eliminate profitability
• You want more control over packaging and the unboxing experience

The Hybrid Approach

Many successful brands use both FBA and FBM. They send best-sellers to FBA for Prime eligibility while fulfilling slower-moving or oversized products through FBM. This optimizes for both conversion rates and cost efficiency.

Tips for FBA Success

1. Monitor your Inventory Performance Index (IPI). Amazon scores your inventory health from 0 to 1000. Scores below 400 may result in storage limits. Keep your IPI high by maintaining sell-through rates and reducing excess inventory.
2. Use a 3PL for prep. As you scale, prepping inventory yourself becomes unsustainable. A 3PL like Marknology's Kansas City warehouse handles labeling, packaging, and compliance so you can focus on growing your business.
3. Forecast inventory carefully. Running out of stock kills your organic rankings. Overstocking incurs storage fees. Use historical sales data, seasonality, and growth trends to forecast demand accurately.
4. Optimize product dimensions. FBA fees are based on size tiers. Sometimes reducing packaging dimensions by an inch can move you to a lower fee tier, saving significant money at scale.
5. Monitor and remove aged inventory. Set up alerts for inventory approaching the 181-day mark. Create removal orders or run promotions to move aging stock before long-term storage fees kick in.

Related: Amazon Private Label in 2026: Is It Still Worth It?

Frequently Asked Questions

Need help optimizing your FBA strategy? Explore our full range of Amazon services or check our FAQ page for more information.

This article is part of our Learn more in our Amazon brand protection.

Amazon FBA & Fulfillment: The Complete Resource Hub

Explore more guides in this series →

See How We Drive Results on Amazon

Our clients average 3-5x sales growth within the first year. See the strategies behind the numbers.