sellershortsAmazon UK Splits Seller Fulfilled Prime by Size: What to Do Before Oct 30
Amazon UK stops judging SFP on your account average. From October 30, each size tier stands on its own, and two new tests go live in January. Here is how to audit before you lose a badge.
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Quick Answer
Starting October 30, 2026, Amazon UK stops measuring Seller Fulfilled Prime eligibility at the account level and starts measuring it separately for three product-size tiers: standard-size, oversize, and extra-large. Two new requirements begin being measured on that date too, but they only become eligibility tests on January 6, 2027, after an eight-week testing window, so use the gap to audit each tier before any badge is at risk.
- Eligibility is now judged per size tier, not on one account-wide average.
- Standard-size products need at least 25% of customer page views showing a one-day delivery date.
- Extra-large products can use an outside carrier if Amazon gets a valid tracking number and you hold 97% on-time delivery.
- The two new tests go live January 6, 2027. The window before then is your free testing period.
Plenty of UK SFP sellers run strong account numbers and never worry about the badge. That comfort is about to break. Amazon announced on October 21 that it is splitting SFP eligibility by product size. Your oversize or extra-large ASINs no longer get carried by a healthy standard-size average. Each tier has to stand on its own.
This is the kind of change that quietly removes the Prime badge from specific products while your account dashboard still looks fine. Below is a plain breakdown of what changed, what to check, and the two January tests you should prepare for now.
Reviewed by the SellerShorts editorial bench. We track Amazon UK SFP policy changes and write them up for sellers who do not have time to read every Seller Central announcement.
What Is Changing and When
Amazon UK is moving SFP eligibility measurement from the account level down to the product-tier level. The announcement landed on October 21, and the change applies to the UK store. Two dates matter.
- October 30, 2026: tier-level measurement begins. Amazon also starts measuring the two new metrics on this date. Amazon says it will update the Maintain Enrolment in Seller Fulfilled Prime policy on October 30.
- January 6, 2027: the two new requirements become actual eligibility tests, after an eight-week testing window.
So the new metrics are visible and tracked for about eight weeks before they can cost you anything. That is deliberate. It is your window to find and fix weak tiers.
One caution: the final policy text that lands on October 30 may read differently from the announcement. Read it before you sign or change any carrier contract.
The Three Size Tiers Explained
Amazon now sorts your products into three buckets and measures each one on its own: standard-size, oversize, and extra-large. The existing requirements you already know are now checked inside each tier.
- Weekend-supporting shipping methods
- On-time shipment rate
- Buy Shipping or Easy Ship usage
- Cancellation rate
Before, Amazon rolled all of this into account-wide averages. Now the same metrics are read per tier. If your extra-large items cancel more often or ship late more often than your standard items, that weakness used to disappear into the blended number. It will not anymore.
| Item | Before Oct 30 | From Oct 30 |
|---|---|---|
| Measurement level | Account-wide average | Each size tier separately |
| Weak tier impact | Hidden inside the average | Surfaces in that specific tier |
| Number of tiers | One blended view | Three: standard, oversize, extra-large |
Why This Can Cost You a Badge
Account-wide averages no longer determine eligibility. That is the whole point. A seller who was comfortably compliant overall can still lose the Prime badge on a single size tier if that tier underperforms.
Think about the typical mix. Standard items ship fast and cheap. Oversize and extra-large items are heavier, slower to collect, and more likely to miss a cut-off or get canceled. In the old system, high standard-item volume papered over those cracks. Now each tier is scored alone, so the slow tier stands exposed.
The 25% One-Day Display Test
The SFP dashboard now shows the percentage of standard-size customer page views that display a one-day delivery date. The threshold is at least 25% of customer page views showing a delivery date within one day. This metric is measured from October 30 but does not count toward eligibility until January 6, 2027.
Read this carefully. The 25% counts page views that show the one-day promise, not the share of orders you actually ship in one day. It is about what shoppers see on the page, not what you dispatch.
The displayed delivery date depends on several things at once:
- Where your inventory sits
- Your cut-off time
- The customer postcode
- Carrier coverage
- Amazon's promise logic
A seller replying to the announcement argued that the displayed date is partly outside seller control, and the source described that view as anecdotal. As analysis rather than Amazon policy, the fair read is this: you control your dispatch speed and carrier settings, but you do not control every displayed date. Tighter handling-time rules for seller-fulfilled listings already affect the date shoppers see, so your handling settings feed directly into this metric.
Your job before January is to push as many standard-size page views as possible into the one-day window by fixing the parts you do control.
Carrier Flexibility for Extra-Large
For extra-large products, Amazon allows a logistics provider outside Buy Shipping or Easy Ship. This is the one piece of good news, but it comes with two hard conditions.
- Amazon must receive a valid tracking number.
- You must maintain at least 97% on-time delivery on those orders.
Miss either one and the flexibility works against you. A carrier that does not feed tracking back to Amazon, or that drops below 97% on-time, will drag your extra-large tier down. Test any outside carrier during the grace period, not after January.
Oversize: What Stays the Same
There is no new speed threshold announced for the oversize tier. No 25% display test, no outside-carrier allowance in the announcement. That does not mean oversize is safe.
Oversize is still measured per tier against the existing requirements: weekend-supporting shipping methods, on-time shipment rate, Buy Shipping or Easy Ship usage, and cancellation rate. The change here is isolation. Your oversize numbers now stand alone, so keep watching them as closely as any other tier.
How to Audit Your SFP Catalog
Here is the move. Use the eight-week window to run a tier-by-tier audit. Do not wait for January to find the weak tier.
- Export your SFP catalog and map each SKU to its new size tier.
- Compare your warehouse cut-off times, carrier collection schedules, and weekend capacity against what the dashboard metrics show.
- For standard-size items, find the postcodes and times where the one-day display disappears.
- Diagnose whether the drops happen on weekends or after a specific cut-off window, then fix carrier coverage or handling settings.
- For extra-large items, test any outside carrier during the grace period before January.
- Measure that carrier's scan quality, missed appointments, and rural-postcode performance.
- Verify every extra-large tracking number reaches Amazon and the delivery scans arrive on time.
- Keep monitoring the existing tier-level requirements for oversize items.
- Review cancellation rate per tier and make sure your inventory feed does not accept orders you cannot fulfill.
If a tier looks weak, you now know where to point the fix: cut-off time, weekend carrier coverage, handling settings, or the carrier itself.
Build Your Paper Trail
Metrics move. Dashboards change. If a badge decision goes against you in January, you want a record of what you saw during the test window.
- Save weekly screenshots or exports during the grace period.
- Log your one-day display percentage per week for standard-size items.
- Log your extra-large on-time delivery rate per week.
- Compare the updated October 30 policy text against the announcement before you change any carrier contract.
A clean weekly record is cheap insurance. It costs five minutes and saves you guessing later.
Key Dates to Act On
| Date | What happens |
|---|---|
| October 21, 2026 | Amazon announces the SFP tier split. |
| October 30, 2026 | Tier-level measurement begins. New metrics start being measured. Amazon updates the enrolment policy. |
| Eight-week window | Testing period. New metrics tracked but not used for eligibility. |
| January 6, 2027 | The two new requirements become eligibility tests. |
Conclusion
The simple version: your account average will not save your weak tier anymore. From October 30, each size tier is judged alone, and two new tests land on January 6, 2027. Use the eight-week window. Map your SKUs to tiers, find where the one-day display drops on standard items, and test your extra-large carrier against the 97% on-time and tracking rules now.
If you want the background on how the program works, read our Seller Fulfilled Prime requirements guide. Delivery performance also feeds account health, so it is worth reviewing Amazon's 2026 delivery rate rule and your account health metrics while you audit each tier.
References
Frequently asked questions
When do the new UK SFP tier rules take effect?
What are the three SFP size tiers?
Does the 25% rule mean 25% of my orders must ship in one day?
How is SFP eligibility measured now versus before?
Can I use my own carrier for extra-large Prime orders?
What on-time rate do I need for extra-large outside-carrier orders?
When do the two new requirements start affecting my Prime badge?
What should I do during the eight-week grace period?
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