Amazon FBA vs FBM in the UK: Which Fulfilment Model Is More Profitable?

Editorial note: This is a researched comparison based on Amazon UK’s published information and standard fulfilment considerations. It is not based on first-hand use of FBA or FBM.

Choosing between Amazon FBA and FBM can have a major effect on your profit margin, workload and ability to grow. The cheapest fulfilment method on paper is not always the most profitable option once you include packaging, postage, storage, labour, returns and the value of your time.

For UK sellers, the right choice depends on your product size, selling price, order volume, delivery expectations and existing fulfilment setup. Some businesses use FBA for fast-moving products while keeping slow-moving, bulky or specialist stock with FBM.

This guide compares Amazon FBA vs FBM in the UK and explains how to calculate the real profit from each model.

What is the difference between Amazon FBA and FBM?

FBA stands for Fulfilment by Amazon. You send inventory to Amazon fulfilment centres, and Amazon stores, picks, packs and ships orders to customers. Amazon also manages customer service, refunds and returns for FBA orders, subject to its policies and processes.

FBM stands for Fulfilled by Merchant, sometimes called merchant fulfilment. You keep the stock yourself, or use a third-party fulfilment provider, and remain responsible for preparing and dispatching orders.

You also need to manage the relevant returns, refunds and customer-service processes unless you use an additional Amazon service.

Amazon describes FBA as a service covering receiving, storage, picking, packing, delivery, customer service, refunds and returns.

With FBM, the seller controls the fulfilment process and must meet the delivery promises and performance standards shown on the listing. See Amazon’s current FBA information and review the latest Seller Central requirements before making a decision.

Amazon FBA vs FBM UK: quick comparison

• FBA: lower day-to-day fulfilment workload, access to Amazon’s fulfilment network and usually the simplest route to Prime eligibility for eligible products.
• FBM: greater control over stock, packaging, postage and customer experience, but more operational responsibility.
• FBA costs: fulfilment fees, storage and potentially removal, aged-inventory, low-inventory or other applicable charges, in addition to normal Amazon selling fees.
• FBM costs: packaging, postage, warehouse or storage, labour, software, returns and customer-service costs, in addition to normal Amazon selling fees.
• Best answer for many sellers: a mixed strategy using FBA and FBM for different products or seasons.

How much does Amazon FBA cost in the UK?

FBA costs vary according to the product’s category, dimensions, packaged weight, selling price, storage volume and the services used. Amazon normally charges a per-unit fulfilment fee and a monthly inventory-storage fee. Referral fees and the selling-plan fee also apply.

As at 24 August 2026, Amazon’s UK pricing information states that the Individual selling plan costs £0.75 per item sold, while the Professional plan costs £25 excluding VAT per month.

Most referral fees are between 8% and 15%, although the exact rate depends on the product category, price and any applicable fee rules. These charges are separate from FBA fulfilment and storage charges.

Amazon also states that a 1.5% fuel and logistics-related surcharge applies to FBA fulfilment fees in the UK from 17 April 2026. Fee changes, category rules and promotional programmes can change, so use the current figures in Seller Central rather than relying on an old blog post or spreadsheet. Check Amazon’s current UK pricing information.

Typical FBA cost categories include:

• Per-unit fulfilment for picking, packing and delivery.
• Monthly inventory storage based on the volume occupied by your stock.
• Inbound transport and preparation costs before inventory reaches Amazon.
• Removal, disposal or liquidation costs if you take stock out of the network.
• Potential aged-inventory, storage-utilisation, overage or low-inventory-level charges where applicable.
• Customer-return or processing charges for some products and situations.

FBA can be cost-effective for small, light products with reliable sales because Amazon’s fulfilment charge may be lower than buying individual courier services and processing each order yourself. It can become less attractive when products are bulky, slow-moving, fragile or expensive to store.

How much does Amazon FBM cost in the UK?

FBM does not mean fulfilment is free. It means that you pay the costs directly instead of paying Amazon to fulfil each order.

Your FBM cost per order may include:

• Postage through Royal Mail, Amazon Shipping, DPD, Evri, Parcelforce or another suitable carrier.
• Boxes, mailers, tape, labels and protective packaging.
• Warehouse rent, shelving, utilities and insurance.
• Picking, packing and dispatch labour.
• Returns postage, inspection, repackaging and refunds.
• Inventory software, barcode tools or third-party fulfilment fees.
• Customer-service time and the cost of handling delivery problems.

Amazon allows Professional sellers to set their own shipping rates for many products, while Individual sellers generally use Amazon’s set shipping rates. The referral fee can also be calculated on the total sale price, including applicable shipping charges and gift-wrap charges, so check the current category and fulfilment rules carefully. Review Amazon’s current UK selling fees.

FBM may produce a better margin when you already have a warehouse, packing operation or discounted courier account. It can also make sense when your products are not suitable for standard FBA economics.

Which is more profitable: FBA or FBM?

There is no universal winner. Compare the total cost per order, not just Amazon’s visible fulfilment fee.

Use this basic calculation for each fulfilment method:

Net profit per order = selling price − Amazon selling fees − product cost − fulfilment costs − returns allowance − advertising − other variable costs

For FBA, fulfilment costs should include the applicable FBA fulfilment charge, storage allocation and any expected additional FBA costs. For FBM, include postage, packaging, labour, storage and a realistic allowance for failed deliveries and returns.

For a practical comparison, create two calculations for the same product:

1. Enter the product price, category, dimensions and weight into Amazon’s current Revenue Calculator using FBA.
2. Record the FBA fulfilment, storage and other estimated charges.
3. Calculate your actual average FBM postage, packaging and labour cost.
4. Add a reasonable allowance for returns and customer-service time.
5. Compare profit per order and profit after monthly overheads.
6. Repeat the calculation at different order volumes because fixed FBM costs become cheaper per unit as volume increases.

You can also use the free UK Amazon Profit Calculator to model your selling price, Amazon fees, product cost, fulfilment expenses and estimated profit. Treat its results as estimates and confirm the final Amazon charges in Seller Central.

When Amazon FBA is likely to be the better option

1. Your products are small, light and fast-moving

FBA often suits compact products that sell consistently. Storage is easier to manage, fulfilment is repeatable and you avoid packing every order manually.

2. You want a straightforward route to Prime

FBA is generally the easiest way for eligible offers to receive Prime fulfilment benefits. Prime visibility and delivery expectations may be commercially valuable, but you should not assume that the badge alone makes an unprofitable product profitable.

3. You are scaling beyond your available time

FBA can remove much of the daily pick-and-pack workload. This may allow you to focus on sourcing, product development, listing optimisation and advertising instead of processing parcels.

4. You want Amazon to manage FBA customer service and returns

Amazon handles customer service, refunds and returns for FBA orders under its applicable processes. This reduces administration, although sellers still need to monitor reimbursements, stock condition, stranded inventory and account performance.

5. You sell across more than one channel

Amazon’s fulfilment services may also support orders from other sales channels through Multi-Channel Fulfilment, subject to the applicable terms, stock arrangements and charges. Compare those charges with a specialist third-party fulfilment provider before committing stock.

When Amazon FBM is likely to be the better option

1. Your products are bulky, fragile or expensive to store

Large products can generate higher fulfilment and storage costs. FBM may give you more control over packaging and the choice of carrier, particularly when you have suitable storage and shipping arrangements already in place.

2. Sales are seasonal or unpredictable

Sending large quantities of stock to Amazon before a short seasonal peak can create unnecessary storage exposure. FBM lets you keep inventory in your own facility until demand appears.

3. Products need specialist preparation

Custom bundles, made-to-order items, personalised products and products requiring unusual inspection may be easier to manage yourself. However, you must still follow Amazon’s listing, dispatch, returns and product-compliance requirements.

4. You already have an efficient fulfilment operation

If you can pick and pack quickly and have competitive courier rates, the difference between FBA and FBM may be significant. This is especially true when your warehouse costs are already covered by other sales channels.

5. You want control over packaging and inserts

FBM gives you more control over the packaging and presentation of an order, provided everything complies with Amazon’s rules. This can be useful for branded products, subscription-style products and multi-channel businesses.

Can FBM products get Amazon Prime?

Yes, some merchant-fulfilled products can qualify through Seller Fulfilled Prime, but this is not the same as ordinary FBM. You need to meet Amazon’s current eligibility and performance requirements, complete the relevant trial and use approved delivery processes.

Amazon’s UK information currently lists requirements including a Professional seller account, a UK-based warehouse, shipping more than 99% of orders on time, an order-cancellation rate below 0.5%, use of Amazon Buy Shipping Services for at least 98% of orders and delivery through supported Seller Fulfilled Prime carriers.

The programme also requires sellers to agree to Amazon’s returns policy and allow customer-service enquiries to be handled by Amazon. Amazon can change programme requirements, so check the current requirements in Seller Central before building your model around Prime.

Seller Fulfilled Prime can be useful for seasonal, slow-moving, oversized or specialist stock that is not well suited to FBA. It also creates a demanding operational standard: same-day handling, accurate stock control and reliable carrier collection are essential. Review Amazon’s current Seller Fulfilled Prime requirements.

FBA vs FBM for returns and customer service

With FBA, Amazon manages customer service, refunds and the physical returns process for FBA orders. Returned items may be assessed and either returned to sellable inventory or treated as unsellable, depending on their condition and the applicable process.

With ordinary FBM, you must monitor return requests, provide the required return method, inspect returned products and process refunds in line with Amazon’s policies.

Amazon’s current FBM guidance says sellers need to respond to return requests within the required timeframe and provide prepaid return labels or returnless refunds where required.

Customer Service by Amazon may be available for some seller-fulfilled orders, but it is a separate paid service with its own terms and potential per-unit charges after any trial period. Do not leave this cost out of an FBM comparison if you plan to use it. Review Amazon’s current FBM guidance.

Should UK sellers use both FBA and FBM?

For many established sellers, a hybrid approach is more practical than choosing only one model.

You could use FBA for:

• Small, light products with steady demand.
• Best-selling products where fast delivery matters.
• Standardised products that are easy to replenish.

You could use FBM for:

• Bulky or fragile products.
• Slow-moving or seasonal inventory.
• Products with many variations or bundles.
• Stock that also needs to be available for your own website, eBay or wholesale customers.
• Products that require specialist handling or custom packaging.

A hybrid model can reduce the risk of putting every unit into Amazon’s network while preserving FBA benefits for the products that need them most. The trade-off is extra inventory complexity: you need accurate stock levels, clear fulfilment settings and a process for preventing overselling.

Amazon FBA vs FBM UK: final verdict

FBA is usually the better choice for small, light, consistently selling products when you value convenience, Prime eligibility and outsourced customer service.

FBM is often more profitable for bulky, fragile, seasonal, slow-moving or specialist products, particularly when you already have efficient storage and shipping operations.

The most profitable option is the one that produces the highest contribution after every relevant cost. Before switching fulfilment methods, compare at least three scenarios: your current method, FBA and a hybrid model.

Amazon fees and programmes change, so check the latest figures in Seller Central and run the numbers using current product dimensions and packaged weight. For broader setup advice, read our complete guide to selling on Amazon UK.

Amazon FBA vs FBM UK checklist

• What is the product’s packaged size and weight?
• How many units sell each month?
• How long does inventory normally remain unsold?
• What is your real postage cost for FBM?
• How much time does each FBM order take to pick, pack and dispatch?
• What is your expected return rate?
• Does the product benefit materially from Prime eligibility?
• Do you have reliable storage and courier collection arrangements?
• Could a hybrid model reduce your total cost or inventory risk?
• Have you checked the current Amazon fee schedule and Revenue Calculator?

For equipment that can streamline merchant fulfilment, see our guide to the best thermal label printers for eBay and Amazon UK sellers.

Seller Equipment You May Need

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