Compare Fulfilment by Amazon and Merchant-Fulfilled options — fees, margins, and which suits UK resellers best.
FBA vs FBM: The 2026 UK Comparison Fulfilment by Amazon (FBA) Amazon stores, picks, packs and ships your stock from their warehouses. Pros: Prime badge, faster shipping, customer service handled, scales easily Cons: Storage fees, removal fees, long term storage surcharges, lost units Typical fees: £2.50–£6 per unit fulfilment + £0.65/cu.ft monthly storage (higher Oct–Dec) Fulfilment by Merchant (FBM) You store and ship orders yourself. Pros: Lower per unit cost, full control of inventory, no storage fees Cons: No Prime badge (unless Seller Fulfilled Prime), slower delivery, customer service is yours Typical cost: Royal Mail/Evri postage + your own packaging + your time When to Choose FBA Items priced £15+ where Prime conversion lift outweighs fees Lightweight, small, fast selling SKUs You want to scale beyond what you can pack yourself When to Choose FBM Bulky/heavy items (FBA fees scale brutally with size) Slow moving or seasonal stock (avoid storage fees) Low value items under £10 where FBA fees eat the margin You already have a fulfilment workflow Hybrid Strategy Most successful UK sellers run both : FBA for bestsellers and FBM for slow movers and oversized stock. 💡 Tip: Always model both routes in our Amazon fee calculator before launching a new SKU.