Amazon FBA vs Shopify Margins: Which Wins in 2026?

Every seller doing volume on Amazon eventually asks whether Shopify would be cheaper. The naive answer — look at the fee rates — says yes, obviously. The honest answer is more interesting: they're roughly equivalent once you price the traffic. Amazon's fee is really a bundled payment for discoverability; Shopify's lower fee is a discount you only realise if you have cheap traffic.

The 2026 fee math, side by side

On a $40 product with $5 shipping charged, US-based:

Amazon FBA breakdown

• Referral fee: 15% of the item price = $6.00
• FBA fulfillment: $5.00 typical for a small standard item (varies widely — check the 2026 size/weight matrix)
• Storage: ~$0.75 per unit-month off-peak, not included in per-order math
• Net before advertising: $33.25

Shopify Basic breakdown

• Shopify Payments processing: 2.9% + $0.30 = $1.61 on $45 gross
• No per-referral fee on Shopify's own checkout
• No fulfillment fee — you pack and ship
• Your shipping cost: variable, ~$3–$6 for small parcels
• Net before advertising: $43.39

The hidden variable: customer acquisition cost

Amazon's fee bundles the traffic. On Shopify you rent it, usually from Meta or Google. The break-even CAC — the point where Shopify's savings equal Amazon's bundled traffic — is:

($43.39 − $33.25) + your return-rate delta ≈ $7.60 / sale

If you can acquire a Shopify customer for less than ~$7.60 per converting sale, Shopify wins. Most brands can — but only once. Repeat-purchase SKUs carry the math further; one-off gifts or niche items rarely do.

When FBA wins outright

• High-search-volume commodities: batteries, cables, kitchen basics. You can't meaningfully out-bid Amazon for these keywords.
• Heavy items where Prime shipping is the differentiator: buyers pay Amazon to avoid $15 ground shipping elsewhere.
• First-time sellers without an audience: Shopify's cheap fees are irrelevant if nobody visits.

When Shopify wins outright

• Brand-driven repeat buyers: email and SMS are nearly free, LTV does the heavy lifting.
• Handmade or customised goods: FBA can't handle custom fulfillment, and Amazon's brand restrictions slow you down.
• Bundles and subscription boxes: Shopify's commerce layer handles these natively; Amazon treats them awkwardly.

The wrong question

"Which platform has lower fees" is the wrong question. The right one is "Which platform's cost structure matches my traffic source?" If traffic is free (Amazon's search, your TikTok), take the platform that doesn't tax you for it. If traffic is paid regardless, take the lower fees.