We got our first $0.02 other charge for a USPS adjustment today.
We had logged USPS labels purchased from 10/18/2026 thru 10/31/2026 where we saw that Amazon was seemingly giving a price that was $0.02 different than what was expected. Today, we got the first adjustment from one of those USPS labels. We expect several more from that 2 week time frame to start coming down as other charges.
These labels were all USPS GA less than 1lb and were zones 4, 5, 6, & 7 for us.
Hopefully this heads up will save you from going down the other charge rabbit hole and save you some time.
Same. Thanks for the heads up. I did get one overchage credit which offset all the .02 charges…so far.
We saw some that we thought should be less and wondered if they were overcharged in that same period. It will be interesting to see how Amazon handles all of those. Glad to know you got one credit for one.
I did not see this very good post from Seller Central on the issue of USPS adjustments on this forum (sorry if it was already been posted). It is a detailed post on how to get your shipping adjustments refunded by Amazon. The process is a bit tedious but it may be worth it for sellers with larger or high volume of adjustments. This post also provides the legal basis required to pursue this in small claims court, which gives you the option to add time spent/costs and other financial harms to the postage adjustment amount (this has actually been successful with multiple sellers).
https://sellercentral.amazon.com/seller-forums/discussions/t/33d8ce85-b83d-46ef-9963-800d89271ea5?postId=33d8ce85-b83d-46ef-9963-800d89271ea5
First … welcome to SAS!
We had seen that post but it isn’t what is happening to Amazon Buy Shipping in relationship with USPS currently. USPS has been doing updates that have been out side the published updates which has caught Amazon (and other USPS contract vendors) off guard in it’s programming in connection to USPS. In the past, USPS did scheduled updates. These updates use to be executed yearly on the 3rd Sunday in January. Then USPS added the bi-yearly update in July on the 2nd (or 3rd) Sunday in July. That process has been in place the last few years. This year USPS has done “updates” to the update several times without an announcement to the public (or at least these were done before any announcement was made). The first one of these “update” to the update was when USPS enacted the rural pricing on USPS GA less than 1lb packages where any weight up to 15.99oz going to a rural zip code was charged the 15.99oz rate (this eliminated tier weight pricing to those rural zip codes). We have seen this type of “update” to the update 3 times this year.
In the past, we use to know exactly what a 3oz package would cost going to a zip code in a stated zone. This is no longer the case. The way things are functioning now with USPS has really eliminated the zone pricing structure. It has become more of a zip code to zip code structure sprinkled with “rural” zip code designations.
This new USPS price structuring has Amazon, PayPal and other shipping vendors back peddling while trying to keep up with USPS unannounced price updates.
I agree with your statements but this post has a very good point, made in a very roundabout way: Amazon charging for prior shipping transactions may not be valid under the contractual framework that USPS has in place with its API users. The framework follows general commerce transaction laws, so in most cases, a vendor cannot retroactively charge you more for a completed transaction, even if its in error. This is how they were able to get their refund, including the out of schedule adjustments you are referring to. It is also good material for any legal path since most courts are going to view these transactions under the general commerce law framework.