Amazon FBA vs FBM for UK small businesses

Amazon FBA and FBM are two distinct fulfilment methods that UK small businesses can use when selling on Amazon. FBA (Fulfilment by Amazon) lets Amazon store, pack and ship your products while FBM (Fulfilment by Merchant) means you handle storage and dispatch yourself.

Choosing between them depends on your product type, order volume, available time and cash flow. This guide explains the practical differences, costs and decision factors for early-stage founders and e-commerce sellers in the UK.

Understanding FBA and FBM

Fulfilment by Amazon (FBA) involves sending your stock to Amazon’s UK fulfilment centres. Amazon then manages storage, customer service for delivery queries, returns processing and shipping when orders arrive. You focus mainly on product sourcing and listing creation.

Fulfilment by Merchant (FBM) requires you to store inventory yourself or with a third-party provider and handle picking, packing and shipping orders. You are also responsible for customer delivery questions and returns. Many UK sellers begin with FBM before scaling into FBA.

Pros and Cons of Amazon FBA

Pros of FBA include:

Prime badge eligibility which can increase visibility and conversion rates for many product categories
Amazon handles storage, packing, shipping and returns, freeing up your time
Access to Amazon’s established delivery network which often results in faster delivery times to customers
Multichannel fulfilment option allowing you to use Amazon’s logistics for orders from your own website or other marketplaces

Cons of FBA include:

Higher ongoing storage and fulfilment fees that reduce margins especially on low-value or slow-moving items
Less control over packaging and branding as Amazon uses standard processes
Potential for inventory to be stored far from optimal locations leading to longer lead times for replenishment
Strict rules on product preparation, labelling and packaging that must be followed to avoid rejection or extra charges

Pros and Cons of Amazon FBM

Pros of FBM include:

Lower per-unit fulfilment costs when you manage operations efficiently
Full control over packaging, inserts, branding and customer experience
Ability to bundle products or include personalised notes which can improve customer loyalty
More flexibility with inventory management and no long-term storage commitments

Cons of FBM include:

No automatic Prime badge which can limit competitiveness in certain categories
Time-consuming order processing that can become overwhelming as sales volume grows
Responsibility for all customer service related to delivery and returns
Potentially slower or less consistent delivery times depending on your chosen courier

Cost Breakdowns in the UK Context

FBA costs typically include monthly storage fees based on space occupied and the time of year, fulfilment fees per unit shipped that cover picking, packing and postage, and optional charges for labelling or preparation. These fees change regularly so always review Amazon’s current rate card. Additional costs can arise from returns processing or inventory removal if stock does not sell.

FBM costs centre on your own warehousing or garage storage, packaging materials, courier charges per parcel and your time spent fulfilling orders. Many UK sellers use Royal Mail, DPD, Hermes or DHL depending on parcel size and speed required. You may also incur costs for returns collection and restocking. Courier rates vary by volume, weight and distance so negotiate where possible once volumes increase.

Compare total landed cost per order for each method including product cost, platform fees, fulfilment and shipping. Low-margin or bulky items often make more sense with FBM while small, high-turnover products can suit FBA better. Track your actual costs over several months rather than relying on estimates.

When to Choose FBA for Your UK Business

Consider FBA when your products are small, lightweight and have consistent sales velocity. It works well if you want to access Prime customers or sell across Europe using Amazon’s network. Early-stage founders often move to FBA once they have validated product-market fit and can afford the upfront stock and fee commitments.

Practical steps before choosing FBA:

Calculate your margins after all Amazon fees using their revenue calculator tool
Send a small test shipment to check product preparation requirements
Review storage costs for your specific item size and expected sell-through rate
Ensure you can maintain steady replenishment to avoid stockouts that hurt ranking

FBA suits businesses ready to scale beyond manual order processing and those selling seasonal items that benefit from Amazon’s peak-period capacity.

When to Choose FBM for Your UK Business

FBM is often the better starting point for new UK sellers with limited capital or highly customised products. It allows you to test multiple products without committing large amounts of stock to Amazon warehouses. Many e-commerce sellers continue with FBM for own-website orders even after using FBA for Amazon sales.

Practical steps for successful FBM:

Set up an efficient home or small-unit fulfilment area with clear processes
Integrate order notifications from Amazon Seller Central with your chosen courier accounts
Choose reliable delivery partners and monitor performance against promised times
Build templates for customer communication about dispatch and tracking
Keep detailed records of returns to identify any product or packaging issues

Choose FBM when you need to control costs tightly, sell bulky or fragile items, or want to build direct customer relationships through branded unboxing experiences.

Making the Decision and Hybrid Approaches

Many UK small businesses use a hybrid model: FBA for bestsellers and FBM for new launches, oversized items or private-label products requiring special packaging. Start by analysing your current and projected order volumes, average item value and time available for operations.

Review your product catalogue and group items by size, weight, sales frequency and margin. Run the numbers for both methods over a three-month period using real data from your account. Adjust based on seasonality since storage fees rise in the fourth quarter.

Whichever route you take, maintain accurate records for HMRC and Companies House requirements. Fees, thresholds and rules change so regularly check GOV.UK, HMRC, Companies House and Amazon’s current terms. Consider speaking with other local founders or using free resources at places like Loomworks in West Yorkshire for practical startup advice.

Frequently asked questions

Can I switch between FBA and FBM on the same Amazon account?

Yes, you can use both fulfilment methods on one Amazon seller account. Many UK businesses run FBA for some listings and FBM for others. You decide per product which method to use and can change this later, although moving existing inventory between methods requires planning and may involve removal or transfer fees.

How do storage fees work with Amazon FBA in the UK?

Amazon charges monthly storage fees calculated by the volume of space your inventory occupies in their fulfilment centres. Fees are higher during the peak retail period from October to December. Long-term storage fees may also apply to stock that remains unsold for extended periods. Always check the latest fee schedule in Seller Central as rates are updated periodically.

Does using FBM affect my Amazon seller metrics?

Yes. Late dispatch or delivery can negatively impact your seller performance metrics and potentially your search ranking. With FBM you are responsible for meeting Amazon’s delivery promises. Monitor your order defect rate, late shipment rate and cancellation rate closely. Strong performance is still possible but requires reliable processes and courier partners.

What preparation is needed to send products to Amazon FBA?

Products usually need FNSKU labelling, correct packaging to survive transit and storage, and compliance with Amazon’s category-specific rules. Some items require additional prep such as polybagging, bundling or bubble wrap. Incorrect preparation can result in refused shipments or extra charges. Start with Amazon’s preparation guidelines and consider sending a small test batch first.

Is FBA or FBM better for selling on other UK marketplaces?

FBA offers multichannel fulfilment so you can route orders from your own website, eBay, Etsy or other platforms through Amazon’s network. This provides consistent delivery but at FBA rates. FBM gives you more flexibility to choose the cheapest or fastest courier for each order. Many sellers combine both depending on the marketplace and product.

Amazon FBA vs FBM for UK Small Businesses