Amazon FBA is worth it — but only if your numbers work. The biggest mistake new sellers make is choosing a product first and checking the margin second. If you reverse that order and start with the economics, FBA becomes a very strong business model.
What does Amazon FBA actually cost?
Every FBA sale in the UK has three main cost layers:
Referral fee — Amazon's commission on each sale, typically 15% of the selling price. Electronics are usually lower (8%) and some categories like jewellery are higher (20%).
Fulfilment fee — what you pay Amazon to pick, pack, and ship the order. In the UK, a small standard item under 150g costs around £2.70. Larger or heavier products attract proportionally higher fees.
Storage fee — a monthly charge per cubic metre for the space your inventory occupies in Amazon's warehouses. Rates increase significantly during Q4 (October–December), so products that sit too long can eat into margin quickly.
On top of these, factor in your cost of goods, PPC advertising, and any prep service costs if you outsource labelling and packing.
When is FBA worth it?
FBA makes sense when your selling price gives enough room to absorb the fees while leaving a worthwhile profit:
- Selling price of at least £15 (lower-priced products rarely make sense on FBA)
- Net margin of at least 20% after all fees and COGS
- Genuine demand in the niche with manageable competition
The sweet spot for UK FBA is products in the £20–£60 range. You pay roughly the same fulfilment fee as a £10 product, but you have much more room for margin.
When is FBA not worth it?
FBA struggles when:
- Your product is heavy or oversized (fees scale with dimensions and weight)
- You're in a saturated category where price-cutting destroys margin
- Inventory sits slowly and accumulates long-term storage fees
- Your COGS is too high relative to what the market will bear
FBA vs selling from your own warehouse
FBA sellers typically achieve higher conversion rates because their listings are Prime-eligible. Prime members convert at roughly 3–5× the rate of non-Prime listings, and winning the Buy Box is far easier with FBA. For most sellers, the additional fees are offset by the higher sales velocity and lower fulfilment headache.
Fulfilment by Merchant (FBM) makes more sense if you have oversized or very heavy products where self-shipping is cheaper, or if you have existing warehouse infrastructure.
The honest verdict
For sellers willing to do proper product research and work out their unit economics before ordering stock, Amazon FBA in the UK is still a worthwhile business model in 2026. The fees have increased, but so has the size of the UK Prime customer base and consumer trust in next-day delivery.
The sellers who struggle are those who skip the maths. Model your exact unit economics with an FBA profit calculator before committing to any product — it takes under a minute and gives you clarity before you spend a pound.