Selling on Amazon is one of the most powerful ways to reach millions of shoppers across Europe and beyond. But before you dive in, understanding the true cost of Amazon FBA is essential. Many sellers are surprised to discover that the fees go well beyond a simple commission, and without a clear picture of the full cost structure, margins can disappear faster than expected. This guide breaks down every major cost category so you can make an informed decision about whether Amazon FBA is the right fit for your business.
What is Amazon FBA and how does it work?
Amazon FBA, or Fulfillment by Amazon, is a service where sellers send their inventory to Amazon’s warehouses, and Amazon handles storage, picking, packing, shipping, returns, and customer service on their behalf. In exchange, sellers pay a set of fees that cover these logistics services, on top of the standard referral fee Amazon charges for each sale.
The model is popular because it removes the operational burden of order fulfillment. Once your products are in Amazon’s fulfillment centers, you benefit from Amazon Prime eligibility, fast delivery promises, and Amazon’s trusted customer service infrastructure. This can significantly increase your conversion rate and Buy Box eligibility compared to self-fulfilled listings.
From a practical standpoint, the process works like this:
- You create a product listing in Amazon Seller Central
- You ship your inventory to an Amazon fulfillment center
- Amazon stores your products until a customer places an order
- Amazon picks, packs, and ships the order on your behalf
- Amazon handles any returns or customer inquiries related to fulfillment
- You receive your payout minus all applicable fees
The convenience is real, but so are the costs. That is why understanding the fee structure before you launch is critical.
What are the main costs of selling via Amazon FBA?
The main costs of selling via Amazon FBA include referral fees, FBA fulfillment fees, storage fees, and optional advertising costs. Together, these can represent anywhere from 25% to 40% or more of your selling price, depending on your product category, size, and sales velocity.
Here is a breakdown of the core cost categories every FBA seller needs to account for:
- Referral fees: A percentage of the total sale price, typically between 8% and 15%, depending on the product category. This fee applies to all Amazon sales, whether you use FBA or not.
- FBA fulfillment fees: A per-unit fee charged for picking, packing, and shipping each order. These fees are based on the size and weight of the product.
- Storage fees: Monthly fees for holding your inventory in Amazon’s fulfillment centers, with higher rates during peak season (typically October through December).
- Advertising costs: While not mandatory, Amazon PPC (Pay-Per-Click) advertising is often necessary to gain visibility, especially for new listings.
- Inbound shipping costs: The cost of sending your inventory from your supplier or warehouse to Amazon’s fulfillment centers.
- Returns processing fees: For certain product categories, Amazon charges a fee when a customer returns an item.
Each of these costs compounds, which is why profitability analysis before launching a product is so important.
How are Amazon FBA fulfillment fees calculated?
Amazon FBA fulfillment fees are calculated based on the size tier and weight of your product. Each unit is measured and weighed after packaging, and Amazon assigns it to a size category that determines the per-unit fulfillment fee. Larger and heavier products always cost more to fulfill.
Amazon uses two primary dimensions to calculate these fees: the product’s unit weight and its dimensional weight (based on the package dimensions). The higher of the two is used as the billable weight.
Size tiers that affect fulfillment fees
Amazon classifies products into size tiers such as small standard, large standard, small oversize, medium oversize, large oversize, and special oversize. Small standard products, for example, are typically lightweight items that fit within specific dimension limits and attract the lowest fulfillment fees. Oversize products, on the other hand, can carry fulfillment fees that are multiples of the standard rate.
The practical implication is clear: product packaging matters. Reducing the size or weight of your packaging, even slightly, can move your product into a lower size tier and meaningfully reduce your per-unit cost. This is worth reviewing before you finalize your product design or packaging specifications.
What are Amazon FBA storage fees and how can they add up?
Amazon FBA storage fees are monthly charges for the space your inventory occupies in Amazon’s fulfillment centers, measured in cubic feet. These fees are relatively modest during standard months but increase significantly from October through December, and Amazon also charges long-term storage fees for inventory that has been sitting for more than 365 days.
Storage fees can quietly erode your margins if you are not managing your inventory carefully. Slow-moving products are particularly vulnerable because they accumulate monthly storage charges without generating revenue to offset them.
Long-term storage fees
Amazon assesses long-term storage fees on inventory that has been in a fulfillment center for more than 365 days. These fees are charged per cubic foot and are significantly higher than standard monthly storage rates. For sellers with seasonal products or slow-moving SKUs, this can become a serious cost driver.
To avoid excessive storage fees, experienced FBA sellers monitor their inventory age regularly, run promotions or price reductions on slow-moving stock, and plan their inbound shipments to align with expected sales velocity rather than shipping large quantities at once.
What’s the difference between Amazon FBA and FBM costs?
The key difference between Amazon FBA and FBM (Fulfilled by Merchant) costs is who handles fulfillment and who bears those costs. With FBA, you pay Amazon’s fulfillment and storage fees but gain Prime eligibility and hands-off logistics. With FBM, you manage and pay for your own warehousing and shipping, but avoid Amazon’s fulfillment fees entirely.
Neither model is universally cheaper. The right choice depends on your product characteristics and operational setup.
- FBA tends to be more cost-effective for small, lightweight, fast-moving products where Amazon’s scale makes fulfillment efficient and Prime eligibility drives higher conversion rates.
- FBM tends to be more cost-effective for large, heavy, or slow-moving products where FBA storage fees and oversized fulfillment fees would be disproportionately high.
- FBM gives you more control over the customer experience, packaging, and shipping speed, but requires your own logistics infrastructure.
- FBA removes operational complexity but ties you into Amazon’s fee structure and requires you to send inventory to their centers in advance.
Many experienced sellers use a hybrid approach, using FBA for their core product range and FBM for bulky or slow-moving items where the economics of FBA do not work in their favor.
How do you calculate if Amazon FBA is profitable for your product?
To calculate Amazon FBA profitability, subtract all costs from your selling price: referral fee, FBA fulfillment fee, storage costs, inbound shipping, cost of goods, and advertising spend. What remains is your net margin. A healthy FBA margin is generally considered to be 20% or above, though this varies by category and business model.
Amazon provides a free tool called the FBA Revenue Calculator that gives you an estimate of fees based on your product’s ASIN or category. It is a useful starting point, but it does not account for advertising costs, inbound shipping, or product returns, so you need to factor those in manually.
A simple profitability framework
Use this structure to evaluate any product before committing to FBA:
- Start with your target selling price based on competitive research
- Subtract the referral fee (check the percentage for your specific category)
- Subtract the FBA fulfillment fee based on your product’s size and weight
- Subtract your estimated monthly storage cost per unit sold
- Subtract your cost of goods including manufacturing and inbound shipping
- Subtract your estimated advertising cost per unit
- What remains is your net profit per unit
If the resulting margin is too thin, you have three levers to pull: increase the selling price, reduce your cost of goods or packaging, or reduce advertising spend through better targeting and listing optimization. Running this calculation before you invest in inventory can save you from launching a product that is structurally unprofitable on Amazon.
How Distrilink helps you sell smarter on Amazon
At Distrilink, we help brands grow quickly and in a controlled way on online marketplaces like Amazon. Instead of building your own marketplace team, IT infrastructure, and logistics operation from scratch, you can activate and scale immediately through us. We represent more than 25 brands and are connected to all major European marketplaces.
Here is what we take off your plate:
- Full account activation and listing optimization so your products are set up correctly from day one
- Data-driven advertising management to maximize your visibility while keeping your cost per sale under control
- In-house fulfillment and logistics managed through our own warehouse, giving you flexibility on product types, volumes, and delivery times
- Centralized product management across all channels through our Distrilink Acceleration Platform
- Customer service handling so you never have to manage marketplace inquiries directly
- Clear performance reporting so you always have full visibility into how your brand is performing
We take care of the full operational execution, from activation and optimization to logistics and customer service, so you can expand your e-commerce presence without added complexity. Want to find out what this could look like for your brand? Get in touch with us and let’s explore how we can help you scale on Amazon and beyond.
Frequently Asked Questions
How much inventory should I send to Amazon's fulfillment centers when I first start with FBA?
When starting with FBA, it's generally advisable to send a conservative quantity — enough to cover roughly 30 to 60 days of expected sales. This limits your exposure to long-term storage fees if the product moves slower than anticipated, while still maintaining enough stock to avoid going out of stock during the early ranking phase. Once you have real sales velocity data, you can calibrate future replenishment shipments more confidently.
What are the most common mistakes new FBA sellers make when calculating their margins?
The most frequent mistake is only accounting for the referral fee and fulfillment fee while ignoring advertising costs, inbound shipping, return rates, and per-unit storage costs. Many sellers also forget to factor in the cost of goods at a fully landed cost — meaning the product price plus freight, import duties, and any prep fees. Running a complete profitability model before ordering inventory is the single most important step you can take to avoid launching a structurally unprofitable product.
Can Amazon FBA fees change over time, and how should I plan for that?
Yes, Amazon regularly updates its fee structure, typically announcing changes at the start of each calendar year. Fulfillment fees, storage rates, and referral fee percentages can all shift, sometimes significantly. The best practice is to review Amazon's official fee schedule at least once a year, recalculate your margins after any announced changes, and build a small buffer into your pricing model to absorb minor fee increases without immediately impacting profitability.
What happens to my inventory if a product isn't selling well on Amazon FBA?
If a product stalls, your inventory continues to accumulate monthly storage fees, and after 365 days it becomes subject to Amazon's long-term storage fees, which are considerably higher. Your options include running a price promotion or a Lightning Deal to accelerate sell-through, creating a removal order to have Amazon return or dispose of the inventory, or liquidating through Amazon's own liquidation program. Acting early on slow-moving stock is always cheaper than waiting until long-term storage fees kick in.
Is Amazon FBA suitable for selling in multiple European countries, or do I need separate setups for each market?
Amazon offers a Pan-European FBA program that allows you to store inventory across multiple European fulfillment centers and sell to customers in countries like Germany, France, Italy, Spain, and the Netherlands without managing separate inbound shipments for each market. However, this requires VAT registration in each country where Amazon stores your inventory, which adds compliance complexity. Alternatively, the European Fulfillment Network (EFN) lets you ship from a single country while still listing across European marketplaces, though fulfillment fees are higher for cross-border orders.
How does Amazon's Buy Box work, and does using FBA improve my chances of winning it?
The Buy Box is the prominent 'Add to Cart' button on a product listing, and winning it is critical because the vast majority of Amazon sales go through it. Amazon's algorithm factors in fulfillment method, seller metrics, pricing, and availability when determining who wins the Buy Box. FBA sellers generally have a strong advantage because Amazon's own fulfillment guarantees fast, reliable delivery — one of the algorithm's highest-weighted factors. That said, competitive pricing and maintaining strong seller performance metrics remain essential even for FBA sellers.
At what point does it make sense to work with a marketplace partner like Distrilink instead of managing Amazon FBA independently?
Managing Amazon FBA independently is feasible when you have a small product range, an in-house team with marketplace expertise, and the time to handle listing optimization, advertising, logistics, and compliance yourself. The calculus changes when you want to scale across multiple European marketplaces quickly, lack internal Amazon expertise, or find that operational management is pulling focus away from your core business. A partner like Distrilink is particularly valuable when speed to market, multi-channel expansion, and operational efficiency are priorities — effectively giving you a ready-built marketplace infrastructure without the overhead of building it yourself.
