The Buy Box, the featured offer, the one with "Add to Cart," is where it's decided who sells. When multiple sellers offer the same product, the algorithm chooses one to put in there, and that salesman takes the vast majority of the sales. The rest remain on the other offers page, where a minority of customers go.
In 2026 the rules have moved in two opposite directions: on the one hand it is easier to enter the race, on the other hand is more difficult to win. Let's see why.
New 1: Eligibility check has been removed
Until recently, there was a barrier upstream: a seller eligibility check that had to be passed before the offer could even compete for the top bid.
According to industry analyses, Amazon removed this control in July 2026, with effect from July 20, 2026 for sellers in the European Union and the United Kingdom.
What this means in practice: multiple offers competing on the same cards. For those who sell their own brand products without competitors, little changes on the listing. For those who resell products shared with other vendors, the game has become crowded: and the winning formula is based on parameters, not access.
There remains one requirement that has not changed: a professional sales plan is needed. Individual accounts, those who pay per item sold, are excluded from the Buy Box.
News 2: Delivery speed thresholds have been raised
Here's the real squeeze. For standard-sized items, the thresholds have been raised:
- the promise of next day delivery must appear in the 40% of Prime customer page views, versus the previous 30%;
- the threshold of the two days she moved on to 75%, against the 70%.
And for those who manage shipments themselves: Starting October 2025, FBM sellers with Seller Fulfilled Prime or premium shipping must meet a 0-day handling time., meaning same-day shipping. Those who fail to do so lose the top offer.
It's a direction that's consistent with everything Amazon has been doing for years: Delivery speed is not an extra service, it's the product. Whoever delivers first wins, even if it costs a little more.
What really weighs in the algorithm
Price matters, but it alone is no longer enough. In 2026, fulfillment speed and account health will be as important as price.
The metrics I track, in order:
- Order Defect Rate (ODR): should be low, roughly below 1%. It's the metric that rules you out, not the one that makes you win.
- Late Shipment Rate (LSR): low and stable.
- Cancellation rate before fulfillment: minimum. Canceling orders because inventory was out of balance is the fastest way to lose the Buy Box across the board.
- Continuous availabilityStockouts don't just cause a loss of revenue for those days. They interrupt the listing's history, and the listing must be regained.
- Evasion methodAmazon logistics starts with a structural advantage in delivery speed. If you manage your own logistics, you have to compensate with very tight real-world processing times.
An operational detail that I often see overlooked: The management times stated must be those that you can meet on the worst days, not the best.. Declaring one day and delivering two on Monday costs more than it earns.
How it works, in practice
Three habits that make the difference in a serious selling account:
1. Measure Buy Box percentage, not just revenue. In Seller Central, this data is available per ASIN. A drop in sales with a stable Buy Box is a demand problem; a drop in sales with a declining Buy Box is your problem, and it's solvable.
2. Look at metrics per product, not aggregated. The account may be healthy on average while three problematic references drag everything else down.
3. Don't reflexively chase the price down. With the entry barrier removed and more offers in the running, the temptation is to cut. But if you're losing the Buy Box due to processing time or availability, cutting the price burns margin without moving anything. First understand which parameter you are losing, then act on that.
In two lines: Entering the Buy Box race is easier, winning it is harder. In 2026, winning is about real delivery speed, continuous availability, and clean account metrics: price alone is no longer enough.
If you are losing Buy Box and you don't know on which parameter, write to me: is an analysis that is done on your account data.
Sources
– GreyScout: Amazon Buy Box changes 2026: a brand's guide
– Seller Labs: Amazon Buy Box 2026: strategies to win
– Feedvisor: 2026 Amazon Buy Box guide
Thresholds and dates are based on industry analysis based on Amazon communications; always check your Seller Central for up-to-date requirements, which may vary by marketplace and category.