01What Changed on July 6 — Every Threshold, Every Tier

Amazon announced the changes on May 25, 2026, giving sellers roughly six weeks to prepare before the new thresholds went live. The mechanics of how performance is measured didn't change — Amazon still evaluates the percentage of Prime customer page views that display a qualifying delivery date, not the percentage of orders ultimately delivered on time. It's the bar that moved.

The extra-large two-day increase deserves particular attention: a 67% relative jump from 15% to 25% of Prime page views. For sellers who have never needed to think about geographic coverage for their oversized items, this threshold change now demands it. A single warehouse strategy that worked for extra-large SFP items before July 6 is almost certainly non-compliant under the new rules.

02The Grace Period: What It Protects and What It Doesn't

Amazon is running a grace period through October 17, 2026, with weekend orders temporarily excluded from speed metric calculations. This gives sellers roughly four months after the July 6 effective date to adjust carrier mix, warehouse cut-off times, and fulfilment infrastructure without losing the Prime badge due to the new thresholds specifically.

03The New Per-ZIP Delivery Promise Tool Explained

Alongside the threshold changes, Amazon is rolling out a new per-ZIP delivery estimation tool inside Seller Central. Currently, SFP delivery promises are calculated from a ship-from ZIP code blended average — a single promise that applies to all customer locations from a given origin point. This creates a systematic problem: sellers with a single warehouse on one coast routinely under-promise to nearby customers and over-promise to customers across the country.

The new tool replaces this with granular, per-customer-ZIP delivery estimates based on actual carrier transit data for your specific ship-from locations, carriers, and service levels. What this means in practice:

• Sellers with warehouses near major population centres will see their promise coverage scores improve automatically once the tool goes live
• Sellers relying on ground transit to cover cross-country zones will see their true coverage exposure clearly — and it won't look good
• The per-ZIP data makes it much harder to argue that your actual delivery performance is better than your promise compliance score shows
• Multi-warehouse sellers gain a new way to demonstrate regional coverage and reduce the risk of badge suppression on individual ZIP code segments

04What Losing the Prime Badge Actually Costs You

The Prime badge is not just a marketing label. It is a ranking and visibility signal built into Amazon's search and Buy Box algorithms. Losing it — or failing to qualify — creates a cascade of commercial consequences that go well beyond the visual change to your listing.

05Who Is Most at Risk: Seller Profiles and Warehouse Configurations

The July 6 changes don't affect all SFP sellers equally. Exposure depends almost entirely on where your inventory sits and how comprehensively your carrier network covers the US population within each delivery window.

06How to Audit Your Current SFP Performance Right Now

The most urgent action for any SFP seller today is to pull current performance data and compare it directly against the new thresholds. Not your recollection of where you stood before July 6 — your actual current data, since measurement has already shifted.

07Your Three Options: Stay, Migrate, or Exit SFP

Once you've audited your current numbers, you have three realistic paths. Which one makes sense depends on your gap size, your product economics, and your operational capacity.

08Modelling the FBA Migration: What the Numbers Actually Look Like

The single most important question when evaluating an SFP-to-FBA migration is whether the product's margin can absorb the FBA fee structure at 2026 rates. Many sellers assume FBA is more expensive than SFP, but this isn't always true — particularly after factoring in the carrier cost increase needed to meet the new SFP thresholds.

This illustration won't fit every situation — FBA also carries storage fees, inbound placement fees, and the fuel surcharge on fulfilment that SFP doesn't. But the point is that the carrier upgrade cost required to meet the new SFP thresholds often narrows the gap with FBA significantly, and in some cases reverses it. Run this model for your specific SKU before assuming SFP is the cheaper option to stay in.

09Action Plan Before October 17

The grace period gives you until October 17 to fix your configuration without badge suppression risk. That's a meaningful window, but carrier contract negotiations, warehouse partnerships, and inventory migration all take time. Here's the sequence that makes the most of what remains.

10Frequently Asked Questions