Why Shipping Adjustments Happen After a Label Is Purchased

When a shipping label is created, the rate is based on the shipment details entered at the time of purchase.

That usually includes things like:

• Package weight
• Package dimensions
• Service type
• Destination ZIP code
• Packaging type
• Rate card or pricing rules
• Any applicable fees or surcharges

But the label purchase is not always the final word.

Once the package enters the carrier network, the carrier may scan, weigh, and measure the package to validate that the correct postage was paid. This can happen across carriers like USPS, FedEx, UPS, and other shipping providers, depending on the shipment and service used.

If the carrier finds a difference between the original label details and the package details they recorded, they may issue an assessment or adjustment.

In plain English: the carrier is saying, “The shipment we processed does not match what was originally paid for.”

That could mean a postage discrepancy, a weight/dimension/zone issue, or a cancellation/refund-related item that needs another look. The result may be an additional charge or another billing adjustment. Either way, these adjustments can create confusion, especially when the reason is unclear or the merchant has a high volume of shipments to review.

What Is a Shipping Assessment?

A shipping assessment is a carrier-generated review of a shipment after the label has been purchased and the package has entered the carrier network.

For example, a merchant may purchase a label using one set of dimensions, but the carrier may later scan the package with different dimensions. If those new dimensions change the billed weight, rate tier, or surcharge eligibility, the carrier may assess the shipment and apply a charge difference.

In ShipBae, USPS Assessment Reports give merchants visibility into those changes on a weekly basis. These reports help show how the original shipment details compare to the carrier-assessed details.

The report may include details like:

• Tracking number
• Original postage charged
• Assessed postage
• Postage adjustment amount
• Original package dimensions
• Carrier-scanned dimensions
• Original weight
• Carrier-scanned weight
• Zone changes
• ZIP code changes
• Packaging details
• Non-standard fees
• Non-compliance fees
• Assessment notes

This gives merchants more context than simply seeing a surprise charge appear on the account.

For more detail, merchants can review the ShipBae Assessment Report Help Center article:

https://shipbae.com/help-center/report/data-report/assessment-report

What Is a Shipping Dispute?

A shipping dispute happens when a merchant believes a label charge, assessment, or adjustment may be incorrect.

Common dispute categories include:

• Postage discrepancy
• Weight / dimension / zone
• Cancellations / refunds

A postage discrepancy may include rate card issues, exclusion zones, or other postage-related billing items. A weight, dimension, or zone issue is tied to how the carrier measures, weighs, or calculates distance between addresses. A cancellation or refund issue applies to unused labels, cancelled shipments, or other refund-related activity.

For example, a merchant may believe the package weight entered at label creation was correct, but the carrier assessed a higher weight. Or the merchant may notice that the final postage does not match the expected rate. In those cases, a dispute gives the merchant a way to request review.

In ShipBae, disputes can be submitted through the dispute form or through available report access points depending on the type of dispute and where the issue is identified. The exact process may vary by carrier because USPS, FedEx, UPS, and other carriers do not all support the same dispute infrastructure.

Merchants can also reference the dispute form examples here:

https://shipbae.com/help-center/manage-shipment/file-a-dispute/dispute-form-examples

The Three Main Dispute Categories in ShipBae

ShipBae organizes disputes into three main categories to help merchants submit the right type of issue for review.

1. Postage Discrepancy

A postage discrepancy happens when the final postage or billing details do not appear to match what the merchant expected.

This may include rate card issues, exclusion zones, or other postage-related charges that need another look.

For merchants, this can be frustrating because the package details may look correct, but the final charge still does not line up. ShipBae helps create a clearer path to review the issue and determine whether it needs further investigation.

2. Weight / Dimension / Zone

A weight, dimension, or zone dispute happens when the carrier’s recorded shipment details differ from what was entered when the label was purchased.

This may include how the carrier measures the package, weighs the package, or calculates the shipping zone based on the distance between the origin and destination addresses.

Because these details can affect the final shipping cost, ShipBae’s assessment reports help merchants compare the original shipment details against the carrier-assessed details when that data is available.

3. Cancellations / Refunds

A cancellations or refunds dispute applies when a shipment was unused, cancelled, or otherwise needs refund-related review.

For high-volume merchants, these issues can be easy to miss if teams are reviewing labels manually. ShipBae gives merchants a structured way to flag and review these issues, especially when multiple shipments need attention.

How the ShipBae Dispute Workflow Works

The dispute process starts when a merchant submits a dispute through the available support or dispute submission process.

From there, ShipBae’s internal process helps move the request through review, validation, and resolution.

Here is the general workflow:

1. The merchant submits a dispute by dispute form, or from available report access points.
2. A support ticket is automatically created.
3. ShipBae’s Customer Support team reviews the request and an investigation begins.
4. If additional review is needed, the request may be routed for internal data review.
5. The team reviews the available shipment, assessment, and billing details.
6. If the issue can be resolved internally by ShipBae, the team provides a result.
7. If carrier review is required and supported, ShipBae submits the dispute through the applicable carrier process.
8. Once a result is produced, approved or rejected, the customer is updated through the original support ticket.
9. If the dispute is approved, any applicable refund is processed to the merchant’s account, minus any non-refundable fees.

This keeps the process connected to the original support ticket, so merchants are not left guessing where the request stands.

What Happens When Carrier Review Is Required?

Not every dispute can be resolved internally.

Some issues require carrier review because the carrier is the source of the assessment, adjustment, scan data, or final billing decision. The exact dispute path can vary by carrier, since USPS, FedEx, UPS, and other carriers do not all support the same review or submission process.

For USPS assessments, ShipBae may review assessment data and submit eligible disputes through the applicable carrier process on behalf of the customer.

For FedEx-related disputes, the process may require more manual review and submission support, depending on the issue and available shipment details.

For UPS-related issues, the process may be more limited depending on the available carrier infrastructure and the type of issue being reviewed.

Once a result is determined, ShipBae relays that outcome back to the merchant with an explanation. If the dispute is approved, any applicable refund is processed to the merchant’s account, minus any non-refundable fees that may apply based on carrier terms or the merchant’s agreement.

This matters because carrier adjustments can be hard to navigate alone. Merchants often need supporting documentation, shipment-level details, and a clear path to submit the issue. ShipBae helps organize that process so it is easier to manage.

What Is Automated vs. What Requires Manual Action?

Some disputes require merchant action. Others may be processed through automatic review, depending on the carrier and issue type.

For USPS assessments, certain predefined cases may be automatically identified for dispute review. These auto-dispute notes are outlined in the USPS Assessment Report, so merchants can see when ShipBae has already flagged an assessment on their behalf.

Examples may include:

• Missing dimensions in the assessment
• Abnormal increases in package dimensions
• Unknown, unclear, or ambiguous charges
• Inaccurate charges based on assessed dimensions or shipment factors

When an auto-dispute is already noted in the USPS Assessment Report, merchants do not need to submit a duplicate dispute for the same or similar reason.

For FedEx and UPS-related issues, the process may be more manual and depends on carrier capabilities, available shipment data, and the type of dispute being reviewed. ShipBae’s Customer Support team can help guide merchants through what information may be needed and what submission path is available.

That is the balance ShipBae is working toward: reducing manual effort where possible while still giving merchants a clearer path to review issues that need attention.

Why Visibility Matters

Carrier assessments can feel frustrating because they often happen after the shipment is already moving through the network.

For merchants, that can create a few major problems:

• Surprise charges after the label was purchased
• Limited context about why the charge happened
• Time spent matching charges back to tracking numbers
• Manual work to gather supporting details
• One-by-one dispute submissions
• Difficulty tracking status across multiple disputes
• Confusion around what the carrier decided and why

This is where ShipBae’s reporting and dispute workflow helps.

Instead of leaving merchants to piece everything together from scattered transactions, ShipBae provides detailed shipment and assessment data where available. Merchants can compare original shipment details against carrier-assessed details, review assessment notes, and identify which charges may need follow-up.

For USPS assessments, ShipBae’s weekly reports add another layer of visibility by helping merchants see assessment details in a more structured way.

How ShipBae Helps Reduce Manual Work

Disputes can be time-consuming, especially when merchants are managing a large shipment volume.

ShipBae helps streamline the process by making dispute submission more accessible and reducing repeated data entry where possible.

Current ShipBae dispute support includes:

• Initial assessment review for users
• Weekly USPS assessment reports
• Detailed shipment and assessment data where available
• Dispute submission through forms or available report access points
• Structured file-based submission for multiple tracking numbers when applicable
• Pre-filled shipment information whenever possible
• Internal review by Customer Support and the Data Team
• Carrier submission when supported and required
• Customer updates through the original support ticket

That means merchants do not have to start from scratch every time they need to question a charge.

Structured Submissions Help High-Volume Merchants

One of the biggest pain points with carrier adjustments is scale.

A single adjustment is annoying. Hundreds of adjustments are a workflow problem.

For high-volume merchants, managing each dispute individually can create hours of manual work. It can also make it harder to identify patterns, like repeated dimension mismatches, recurring postage discrepancies, or charge types that need deeper review.

When multiple tracking numbers need review, ShipBae can support structured file-based submissions instead of requiring every issue to be written from scratch one by one.

That matters because carrier billing issues are not just accounting problems. They can affect margins, operations, and the amount of time teams spend chasing down answers.

Designed for More Transparency

Some shipping workflows make it difficult to understand what happened, why a charge appeared, or what evidence is needed to dispute it.

ShipBae is designed to give merchants more visibility into the process.

Key differentiators include:

• USPS assessment reporting to help identify issues sooner
• Detailed shipment and assessment data where available
• Clear comparison between original and carrier-assessed details
• Assessment notes that explain relevant charge details
• Auto-dispute notes for eligible USPS assessments
• Structured file-based submissions for multiple tracking numbers when applicable
• Internal support and data review
• Carrier escalation when supported and required

The goal is simple: make post-shipment billing issues easier to see, easier to understand, and easier to manage.

ShipBae Is Continuing to Improve the Dispute Experience

As carrier billing gets more complex, merchants need better visibility, cleaner workflows, and less manual back-and-forth.

ShipBae’s goal is to keep improving that experience while helping customers understand what happened, what needs review, and what action may be required.

Final Takeaway

Carrier assessments and shipping disputes are a normal part of shipping, but they should not feel impossible to understand.

When a carrier adjusts a shipment after the label is purchased, merchants need visibility into what changed, why it changed, and what can be done about it.

ShipBae helps by giving merchants detailed assessment data, a structured dispute workflow, internal review support, and carrier escalation when supported and required.

Because when carrier billing gets messy, your team should not have to spend hours playing detective or chasing paperwork.

ShipBae helps make the process clearer, faster, and easier to manage, so your team can spend less time on paperwork and more time keeping shipments moving.