How one seller resolved weight and dimension fee overcharge

TL;DRWeight and dimension fee overcharge on Amazon UK occurs when Amazon's fulfilment system records a product's size or weight incorrectly, then applies a higher fee tier to every unit sold – silently draining margin across an entire catalogue for weeks or months before most sellers notice. The overcharge is recoverable, but the path requires measurement evidence, a structured reimbursement claim, and persistence through Seller Central's dispute process. This case study walks through how one FBA seller identified the problem, built the claim, and worked through to a qualitative resolution – and what that means for other sellers carrying the same risk.

This page covers the situation, what was actually happening inside the account, the strategy we used, the outcome, and the single most transferable lesson from the matter.

What brought this seller to us – and why the loss kept growing

A mid-market FBA seller on Amazon UK – home and kitchen accessories, mid-sized units, steady monthly volume – contacted Tutamen in winter 2025 after noticing a persistent margin gap that no pricing change had fixed. The business was profitable on paper. The cash position told a different story.

The seller had been reviewing Seller Central's fee reports for some time. Something in the fulfilment-fee line felt wrong, but the reports themselves are dense, and cross-referencing fee tiers against product dimensions is not straightforward. The account manager had raised a case with Amazon Seller Support, received a templated response, and let it rest. The drain continued.

By the time we were instructed, the seller estimated the discrepancy had been running for several months. The exact figure was not yet confirmed – that was part of the problem. The seller also had a concurrent disbursement hold tied to a separate A-to-z Guarantee claim. Both issues were pressing. The inventory bill was due. Advertising commitments were locked in for the quarter. The commercial pressure to resolve quickly was real, and it affected the seller's instinct about which route to take first.

That instinct – to handle both issues simultaneously and as fast as possible – was the first decision point we had to work through together.

What was really happening inside the account

Amazon UK's fulfilment fee structure for FBA products is based on the size tier assigned to each ASIN. That tier is determined by the product's unit weight and the longest, median, and shortest dimensions as measured by Amazon's fulfilment centres. The measurement data lives in the product detail page under "Product dimensions" and in the fee preview tool – but those values are not necessarily what Amazon actually used when it set the fee tier.

The operative question is always: what did Amazon's system record, and does that recording match the product as physically measured? When the recorded values push a product into a larger or heavier size tier, every fulfilment fee charged since that mis-measurement compounds the overcharge. On a product with meaningful volume, the total accumulates quickly.

In this seller's account, three ASINs were the principal problem. Two had been remeasured at the fulfilment centre at some point and the recorded dimensions had drifted upward – enough to push them into a higher fee band. The third was a packaging-change issue: the seller had reformatted the outer carton to improve stacking efficiency, but Amazon's system still carried the old, larger measurement. None of the three were flagged by any automated alert. The seller found the discrepancy only by running the fee report against their own product specifications.

A weight and dimension fee overcharge is, in substance, a billing error – Amazon charged fees based on inaccurate data. The seller's right to seek correction and reimbursement exists, but exercising it requires demonstrating the inaccuracy with verifiable evidence and pressing the claim through the right channels in the right order.

What often happens instead: sellers open a generic Seller Support case, get a partial credit or nothing, and accept that result. In matters we handle, a structured submission – with supporting measurement documentation and a clear accounting of the overcharge period – typically opens a different conversation than an informal dispute ticket.

The procedural path – and where sellers lose ground

The standard route for a weight and dimension dispute on Amazon UK runs through Seller Support's FBA fee dispute process, with remeasurement requests submitted through Seller Central. Amazon will, when presented with sufficient evidence, re-examine a product at the fulfilment centre and update the recorded dimensions. If the new measurement supports the seller's position, the corrected tier applies going forward. The harder part is the retrospective reimbursement – recovering the overcharge for the period the incorrect tier was in effect.

There are several points at which a claim can lose momentum or be narrowed. First, Amazon's process has a lookback window for fee disputes – how far back a reimbursement claim can reach is not unlimited. Sellers who delay in filing a formal dispute reduce the period for which they can recover. Second, a remeasurement request does not automatically trigger a reimbursement review. The two steps are linked in practice but require separate, explicit action in the case. Third, Amazon may accept a corrected dimension going forward while disputing the retrospective element – that portion of the claim needs to be pursued separately and explicitly.

For this seller, the concurrent disbursement hold added a layer of complexity. There is a temptation, when multiple issues exist in an account, to bundle them into a single escalation. In our experience, that tends to slow both claims. Separating the fee overcharge dispute from the A-to-z hold, and running them through their respective channels with dedicated documentation, is almost always the cleaner approach. That is what we recommended here.

We also identified that one of the three ASINs had a complication: the packaging reformulation had occurred after the original measurement was taken, which meant Amazon's "incorrect" measurement of that product was – from their perspective – accurate at the time of measurement, but no longer accurate for current units. That required a different framing than a straightforward measurement error. It was a product-change notification issue, and the reimbursement argument tracked accordingly.

Strategy: building the claim and managing the timeline

Our approach in this matter had four components.

First, we reconstructed the fee timeline. Using the seller's transaction reports and fee reports from Seller Central, we mapped the point at which the dimension discrepancy first appeared in the fee charges, the volume of units affected at each of the three ASINs, and the difference in fee per unit between the tier Amazon applied and the tier the correct dimensions would have placed each product in. This reconstruction served two purposes: it gave us a documented basis for the quantum of the claim, and it identified the start date of the overcharge period – which matters for any lookback-window argument.

Second, we organised the measurement evidence. The seller had their own product-specification documents from the manufacturer. We worked with the seller to obtain fresh, independently conducted measurements of the physical products, documented to a standard that Amazon's dispute process could use. For the packaging-change ASIN, we pulled the modification date from the seller's own records and aligned it with the fee data to establish the correct period for the overcharge argument.

Third, we filed the remeasurement requests and the formal fee dispute through the appropriate Seller Central channels, with each ASIN handled as a discrete case. The submission for each included the reconstruction, the measurement evidence, and a clear statement of the claim. We did not use general language ("we believe there is an error"); we stated the specific discrepancy, the specific period, and the specific corrective action requested.

Fourth, we separated the disbursement hold dispute and ran that in parallel through its own track. Our work on disbursement holds follows the same principle as our broader approach to frozen funds and disbursement recovery for FBA sellers – map the held balance first, then address each component through its proper mechanism.

The timeline stretched across several weeks. Amazon's remeasurement process does not move instantly, and the retrospective reimbursement element required follow-up on all three ASINs. One ASIN was resolved relatively quickly. The packaging-change ASIN took longer, because the framing required additional documentation to establish the modification date.

Outcome and the seller's decision points

The account was not deactivated in this matter – a point worth stating plainly, because the seller's fear on arrival was that pursuing the fee dispute aggressively might create friction that destabilised the account. That concern is not irrational. It reflects something we see regularly: sellers holding back from legitimate claims because they are worried about the account relationship. In practice, a structured, documented fee dispute does not carry that risk. The risk is in poorly documented or confrontational submissions, not in the act of disputing a fee error.

The outcome was qualitative: the remeasurement corrections were accepted for all three ASINs. Reimbursement was credited for a meaningful portion of the overcharge period. The packaging-change ASIN recovered a shorter lookback window than the other two, consistent with the different framing of that claim. The disbursement hold was released through a separate process, resolving the immediate cash-flow pressure.

The seller's decision points during the matter were instructive. The first was whether to bundle the issues or separate them. We recommended separating. The second was whether to accept an early partial credit on one ASIN as full settlement of that claim. We advised against it: the partial credit did not account for the full overcharge period, and accepting it would have effectively waived the remaining claim. The third was how to handle the packaging-change ASIN – whether to treat it as a measurement error or a product-change notification failure. The correct framing made the difference to whether any reimbursement was available at all.

A home-goods FBA seller on Amazon US (spring 2026) came to us with a comparable dimension-discrepancy issue – different surface, different catalogue, but the same structural problem. We mapped the fee data, filed separate ASIN-level disputes, and worked through to corrections that applied going forward and a retrospective credit for the documented period. Each claim turned on the quality of the measurement evidence and the precision of the timeline reconstruction.

For sellers who have faced related issues – unit discrepancies after inventory removal or disposal – the procedural logic is similar. How those claims are structured is covered in detail in our guide to removal order discrepancies and the reimbursement path, and, for inventory that has been disposed of entirely, in our step-by-step guide to handling a disposed inventory claim.

The lesson for other Amazon UK sellers

Weight and dimension fee overcharge is a silent drain. It does not generate a notice, a warning, or a flag in Account Health. It is visible only if you run the fee data against your own product specifications and look for divergence. Many sellers carry an overcharge for months before they find it – and some never find it at all.

The myth worth addressing directly: held funds and billing errors are not permanent losses. We regularly see sellers who have concluded that an overcharge is uncorrectable because a first Seller Support case came back rejected or with a token credit. That conclusion is usually premature. A rejected informal case is not a final determination. The formal dispute path, with adequate documentation, is a different process – and it is the one that produces results.

The practical lesson from this matter is that there are three things a seller can control in a fee dispute: the quality of the measurement evidence, the precision of the timeline reconstruction, and the separation of distinct claims into their own channels. All three affected the outcome here. None of them required anything unavailable to a seller who is willing to do the underlying work – or to instruct someone who will do it for them.

What the seller could not control was the pace of Amazon's process. Remeasurement, review, and retrospective credit all take time. A seller running on thin cash flow, with inventory commitments outstanding, feels that time acutely. That commercial pressure – the money is committed while the dispute runs – is the real cost of the overcharge, and it is the reason that a structured, properly documented first submission matters more than a fast one.

If a first submission has already failed, the question to ask is not "is the claim dead?" but "why did the submission fail?" In many matters, the answer is that the quantum was undocumented, the measurement evidence was insufficient, or the claim was framed in a way that Amazon's process was not designed to accept. Those are correctable problems.

Related areas

• Frozen Funds & Recovery – recovering held balances, reserves, and FBA reimbursements from Amazon and other marketplaces
• Amazon Account Reinstatement – Plan of Action drafting and appeal strategy for deactivated Amazon accounts

Frequently asked questions

How long does resolving weight and dimension fee overcharge usually take on Amazon UK?

The timeline varies and depends on the number of ASINs involved, the completeness of the measurement evidence, and whether Amazon disputes the quantum of the retrospective claim. In matters we handle, remeasurement decisions typically arrive within several weeks of a properly submitted case; retrospective reimbursement review may take additional time beyond that. A poorly documented first submission can extend the overall timeline significantly, because it invites a rejection that then needs to be reopened.

What are the main risks if I handle weight and dimension fee overcharge alone?

The principal risk is an avoidable narrowing of the claim. Sellers who accept a partial credit without pressing the full lookback period, or who bundle a fee dispute with other account issues, routinely leave recoverable funds on the table. A second risk is submitting a remeasurement request without simultaneously preserving the retrospective reimbursement claim – Amazon's process treats the two as separate steps, and failing to take both reduces what can be recovered. A third risk is a mis-framing of the claim, which may result in a rejection that is treated as final when it is not.

Do I need a lawyer for weight and dimension fee overcharge?

Not every fee dispute requires legal representation. If the discrepancy is straightforward – one ASIN, a clear measurement error, a short overcharge window – a seller who understands Seller Central's dispute process may be able to resolve it directly. Legal involvement adds value when the quantum is material, when multiple ASINs are involved, when a first submission has already been rejected, or when the fee overcharge is running alongside a disbursement hold or account-health issue that complicates the approach. In those situations, the structure and documentation discipline that an attorney brings typically recovers more than the cost of the engagement.

About Tutamen

Tutamen is an independent law firm for online marketplace sellers. We represent Amazon, Walmart, Etsy and eBay sellers in account deactivations, frozen-funds recovery, intellectual-property disputes, arbitration and Notices of Dispute, and US federal Schedule A defense, plus EU marketplace regulation. Our work is attorney-led and confidential, with fees quoted up front. We act for founders, brand owners and in-house teams who need a specialist for a marketplace dispute. Our fee disputes practice is handled at the attorney level on fixed-fee terms, with the scope and cost confirmed after a short review of the account data. To discuss your situation, email info@tutamenlaw.com.

This page was authored by Helena R. Voss, Partner – Reinstatement and frozen-funds recovery at Tutamen. Helena leads the firm's account-balance and reimbursement matters across Amazon US and UK.

Page authored by Helena R. Voss, Partner, Reinstatement, Tutamen.

Disclaimer: This article is general information, not legal advice, and does not create an attorney-client relationship. Marketplace policies and the law change, and every account and case is different. For advice on your situation, contact Tutamen at info@tutamenlaw.com.