How to handle weight and dimension fee overcharge on Amazon UK

TL;DRA weight and dimension fee overcharge on Amazon UK occurs when Amazon's fulfilment system records a product's measurements or weight incorrectly, causing the seller to be charged FBA fulfilment fees based on a larger or heavier size tier than the actual item warrants. The practical result is a quiet, ongoing drain on margin – often running for months before anyone notices. Recovering the overbilled fees is procedurally possible, but the path requires measurement evidence, a correctly filed case, and persistence through Amazon's review process.

This guide walks through that process step by step: what is actually happening in the fee calculation, how to build the evidence you need, where the procedure goes wrong, and the decision points that determine whether a recovery is worth pursuing. If you are already dealing with a broader hold on funds or disbursements, the fuller picture is in our complete guide to frozen funds recovery for sellers.

What does a weight and dimension fee overcharge actually mean on Amazon UK?

Amazon calculates FBA fulfilment fees using a size-tier system: the heavier or larger the package, the higher the fee per unit shipped. When the stored measurements in Amazon's system are wrong – even by a small margin – a product can be pushed into a higher size tier, and every shipment of that ASIN from that point forward is billed at the inflated rate.

The overcharge is not a one-time event. It compounds with every unit fulfilled. A product moving at even modest velocity can accumulate a significant overbilling over weeks or months before a seller notices the discrepancy in their fee reports. That is the core commercial damage: it is silent, systemic, and retrospective.

On Amazon UK specifically, the size tiers are defined in Amazon's published fee schedule, which applies to Amazon's EU fulfilment network. Products are measured either at the point of receipt at a fulfilment centre or through periodic re-measurement. Errors can enter the system at intake – a measuring error at the fulfilment centre – or through a re-measurement that was incorrectly logged. Either way, the wrong figure sits in the product detail back end and drives fees automatically.

The money is being charged against every disbursement cycle while your inventory bills, advertising costs, and restocking costs keep running. That is the real urgency here – not a one-time administrative error, but a recurring fee that will continue until it is corrected.

How do you identify that an overcharge has happened?

The first step is pulling the right report. In Seller Central, the Fee Preview report and the FBA Fee and Inventory report (accessed through the Reports and Fulfilment menus) will show you the dimensions and weight Amazon currently has on record for each ASIN, alongside the size tier assigned.

Download the report and compare Amazon's recorded measurements against your own. The comparison needs to be specific: length, width, height, and unit weight, each measured to the same precision Amazon uses (typically centimetres and kilograms on Amazon UK). A difference of even a centimetre in the longest dimension can shift a product from one size tier to the next, and that shift is where the fee difference lives.

In matters we handle, sellers often discover overcharges that have been running for considerably longer than they realised – because the fee report requires deliberate cross-referencing against physical measurements. It is rarely visible in the headline P&L without that specific check.

Once you have identified a discrepancy, calculate the fee differential per unit and multiply by the number of units fulfilled during the period the wrong measurements were in place. That gives you a working figure for the claim. Keep this calculation; you will need it when you escalate.

Step 1: Measure accurately and create a contemporaneous record

Before filing anything with Amazon, take your own measurements with calibrated equipment – a tape measure accurate to the millimetre, and a scale accurate to at least two decimal places in kilograms. Measure several units from the same ASIN to rule out unit-level variance. Record the measurements, the date, the device used, and the batch of units measured.

Photographs matter here. Take a photograph of each unit on the scale and alongside a measuring tape, with the reading visible. If you have original manufacturer specifications or a packing-list document that states the product's dimensions and weight, add those to your evidence file.

Why does this step deserve its own section? Because the single most common reason a fee dispute is rejected at the first stage is that the seller submits a claim without independent measurement evidence. Amazon's reviewer will compare your claim against the measurements their system holds. Without external evidence, there is no basis for them to override the existing record.

We regularly see disputes arrive after sellers have filed once and been rejected. In most of those situations, the rejection came back because the original filing contained only an assertion that the dimensions were wrong, with no supporting documentation. The second filing, with proper measurement evidence attached, typically moves the case forward.

Step 2: Open a case through Seller Central and request a re-measurement

With your evidence file prepared, open a case with Seller Support. The appropriate route on Amazon UK is to file through the Help section in Seller Central, describing the issue as an FBA fee dispute related to incorrect product dimensions or weight. Reference the specific ASIN, the measurements Amazon currently holds, your measured figures, and the size tier each set of figures would produce.

Amazon's standard response at this stage is to offer a re-measurement. This is a physical re-measurement of the item at the fulfilment centre. Request it explicitly if it is not offered. Amazon's re-measurement process is the primary mechanism for correcting the record on file, and the outcome of that re-measurement will determine whether the correction is applied going forward.

A few practical notes on the re-measurement request: ensure the units you want measured are actually in stock at a fulfilment centre before you file. If all units have been sold or removed, Amazon may decline to re-measure, and you will need to send fresh stock before a re-measurement can take place. State clearly in your case that you are requesting a re-measurement and, simultaneously, a credit for fees charged at the incorrect rate during the period of overbilling.

Keep the case reference number. Every subsequent communication should reference it.

Step 3: Follow the re-measurement outcome and press the retrospective credit

If the re-measurement confirms your figures, Amazon should update the product record and adjust the fee tier going forward. That is the correction to the ongoing charge. But the retrospective credit – recovering the fees already paid at the wrong rate – is a separate claim, and it does not happen automatically.

This is where many sellers stop. The measurements get corrected, the future fees normalise, and the seller considers the matter resolved. The overcharge that accumulated before the correction – which may represent a significant portion of the total loss – goes unrecovered.

To press the retrospective credit, you need to reopen or escalate the existing case (or open a new case referencing the closed one) and explicitly claim the fee differential for the historical period. Provide your calculation: the fee per unit at the incorrect tier, the fee per unit at the correct tier, the differential, and the number of units fulfilled during the period of incorrect measurement. Amazon has the unit-level fulfilment data; your calculation gives them the roadmap.

In matters we have handled, the retrospective credit phase takes longer and requires more follow-up than the correction itself. Expect a cycle of responses, requests for additional documentation, and escalation if the initial review declines. That is normal. It is not a signal that the claim is invalid.

Where does this process go wrong?

The procedural path above is straightforward on paper. In practice, there are several consistent failure points.

Filing without measurement evidence. As noted above, a claim unsupported by independent measurements will typically be rejected at the first stage. Amazon's system has a record; you need external evidence to displace it.

Accepting the correction without pursuing the retrospective credit. The correction and the credit are separate outcomes. A seller who stops at the correction has recovered the future value but left the historical overbilling on the table.

Not tracking the case through Amazon's escalation path. Seller Support cases can stall, be closed prematurely, or be handled by a representative who does not have authority to process a fee credit. When a case stalls – no substantive response for several business days – it needs to be escalated. On Amazon UK, the escalation path runs from standard Seller Support to Account Health specialists to, in the cases that require it, a formal written complaint through Amazon's internal complaints mechanism. Knowing which tier to move to, and when, is not obvious from the Seller Central interface.

Missing the time limit on historical claims. Amazon places a limit on how far back a fee credit can apply. The practical window for historical FBA fee claims on Amazon UK is generally understood to extend back approximately 18 months from the date of the claim, though the exact limit can depend on how the case is categorised by Amazon's team. Delaying a filing reduces the recoverable period. File as soon as you identify the discrepancy.

A related issue that affects some sellers alongside a dimension overcharge: removal order discrepancies, where inventory removed or disposed of does not match what Amazon records. That issue follows a different procedural path, described in our removal order discrepancy checklist. If both issues are present on the same account, address them separately – each needs its own case and evidence file.

Decision points: when to escalate and when to involve a specialist

Not every fee overcharge requires professional involvement. A seller with a straightforward discrepancy, clean measurement evidence, and a responsive Seller Support case can often work through the process independently. The guide above describes exactly that path.

The calculus changes in three situations.

First, when the historical claim is material. If the accumulated overcharge is significant relative to the business's cash position – and particularly if it is sitting against a disbursement hold that is adding pressure to cash flow – the cost of getting the filing right the first time is lower than the cost of a rejected claim and delayed recovery.

Second, when the case has already been rejected once. A first rejection is not a final answer on Amazon UK, but a second filing needs to be substantively different from the first – new evidence, a corrected calculation, or a different escalation path. Filing the same case again typically produces the same outcome.

Third, when the overcharge is part of a broader funds issue. A fee overcharge running alongside an account deactivation, a disbursement hold, or other FBA reimbursement claims requires a coordinated approach. The right sequencing matters: a fee-credit claim filed mid-deactivation can complicate the reinstatement case if it is not handled carefully.

If you are dealing with a dimension overcharge alongside a broader account or funds issue, the overlap with how disposed inventory claims are handled on other marketplace platforms is a useful reference point for how inventory-loss and fee-recovery claims interact in practice.

The question sellers most commonly ask us at this point is whether involvement from a specialist costs more than the credit is worth. The answer depends entirely on the size of the claim and the stage the case has reached. For matters where the overcharge is modest and the case is progressing normally through Seller Support, independent handling is often appropriate. Where the claim is material, the case has stalled, or a broader funds situation is involved, we work to map every held balance and press the disbursement and reimbursement claims in a coordinated sequence.

A home-goods FBA seller on Amazon UK (winter 2025) reached us after a Seller Support case had been running for several weeks without a credit being applied. The re-measurement had confirmed their figures, but the retrospective credit had been declined twice without explanation. We reviewed the measurement documentation, recalculated the historical overcharge period, and escalated through Amazon's internal complaint process with a written submission setting out the basis for the credit. The credit was applied within the following billing cycle. The correction to the fee tier had already been made; the work was entirely on the historical recovery.

The bridge to the next section: if a first filing or escalation has already been rejected, the reason for that rejection is rarely stated clearly in Amazon's response. A second read of the case file typically reveals what is missing and what, if anything, remains open.

To discuss a fee overcharge case, email info@tutamenlaw.com for a review of the account position before committing to a course of action.

What if Amazon's re-measurement disagrees with yours?

This is a genuine problem, and it comes up more than sellers expect. Amazon re-measures the item at the fulfilment centre and returns a figure that still differs from yours – sometimes modestly, sometimes significantly. The re-measurement result is not automatically final.

Where re-measurement results conflict, the approach is to request a second re-measurement and to provide additional corroborating evidence: the manufacturer's product specification sheet, the original import documentation (which typically records dimensions and weight for customs purposes), and any third-party logistics records that captured the item's measurements on intake.

If re-measurements continue to produce inconsistent results, the case can be escalated as a process dispute rather than simply a measurement dispute. That framing – arguing that Amazon's measurement process has produced unreliable results rather than that a single measurement was wrong – sometimes opens a different review pathway. It is also the point at which having a structured written record of every measurement, date, and case reference becomes critical.

A persistent discrepancy that cannot be resolved through re-measurement and escalation may ultimately require a formal complaint through Amazon's UK-registered entity. That step is rare for fee disputes, but it is available. Amazon operates in the UK as a regulated entity, and sellers have access to internal complaint mechanisms that go beyond standard Seller Support. Using those mechanisms effectively requires knowing which threshold a complaint needs to meet and how it needs to be framed.

The broader lesson here is one we encounter regularly in our practice: the belief that held or incorrectly charged funds are irretrievable is the myth that causes sellers to leave money on the table. The retrospective credit path is real. It takes evidence, persistence, and correct procedure – but the money is not gone.

Related areas

• Frozen Funds & Recovery – recovering held disbursements, FBA reimbursements, and fee credits across Amazon marketplaces
• IP & Brand Registry – handling rights-owner complaints and Brand Registry disputes that affect account status

If a first appeal or filing already came back rejected, a second review can identify the specific gap and determine what the realistic next steps are. Email info@tutamenlaw.com to start that conversation.

Frequently asked questions

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

The timeline varies depending on how quickly the re-measurement is completed and whether the retrospective credit requires escalation. A straightforward case – clean evidence, co-operative Seller Support case, re-measurement confirming the discrepancy – can resolve in several weeks. Cases requiring escalation, a second re-measurement, or a written complaint through Amazon's internal process typically take longer. In matters we handle, a fully resolved credit, including the historical period, often takes a number of weeks to a few months from initial filing to credit applied.

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

The primary risks are filing without sufficient measurement evidence and accepting the forward correction without pressing the retrospective credit. Both result in leaving recoverable funds unclaimed. A secondary risk is allowing the case to stall in Seller Support without escalating at the right time – Amazon's case-handling process has natural escalation points, and a case that is not moved along those points can simply expire. If the claim is material or the case has already been rejected once, those risks increase substantially.

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

Not in every case. A seller with a clear discrepancy, solid measurement evidence, and a claim that moves normally through Seller Support can often handle it independently using the steps in this guide. Involvement from a specialist becomes appropriate when the claim is significant in value, the case has been rejected once or stalled, or the fee overcharge sits alongside a broader account or funds issue that requires a coordinated approach. In those situations, the cost of a structured filing is typically outweighed by the value of the claim and the risk of a second rejection.

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. Every matter is handled with attorney oversight and under confidentiality obligations from the outset – two things that matter when account and funds issues carry commercial consequences. To discuss your situation, email info@tutamenlaw.com.

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.