Learn about:
What causes Amazon ASN chargebacks and why they occur
How to improve ASN accuracy and avoid common compliance mistakes
Practical steps suppliers can take to reduce Amazon chargebacks and strengthen compliance performance
Amazon ASN chargebacks rarely begin at the fulfillment center. Most start days or even weeks earlier with a missed process step, incomplete shipment data, or information that doesn't match what ultimately arrives at Amazon's dock. An Advance Ship Notice (ASN), the electronic document that tells Amazon what is being shipped before it arrives, plays a critical role in the receiving process. When ASN information is late, incomplete, or inaccurate, suppliers may receive ASN chargebacks, which are deductions Amazon issues to recover costs associated with receiving and processing shipment discrepancies.
A single quantity mismatch, missing expiration date, or delayed ASN submission can trigger compliance issues that seem small in isolation but become costly when they occur across hundreds or thousands of shipments. In many cases, these issues are categorized as "No ASN Received" or "Other Than Not Confirmed" (OTNC), meaning the shipment data Amazon received did not align with the physical inventory arriving at the fulfillment center.
The good news is that many ASN chargebacks are preventable. By understanding what Amazon expects, validating shipment information before inventory leaves the warehouse, and creating consistent operational processes, suppliers can significantly reduce compliance issues, improve receiving performance, and minimize costly deductions.
Related Reading: How Amazon's Receive Process Impacts Suppliers
What Causes Amazon ASN Chargebacks?
Amazon ASN chargebacks occur when information contained within the ASN does not align with the shipment Amazon receives. While suppliers often focus on major compliance failures, many ASN chargebacks result from simple mistakes that repeat over time.
Common causes include:
Unit count mismatches
Missing or inaccurate expiration dates
Missing ARN or PRO numbers
Incorrect carton or pallet information
Invalid shipment details
Late ASN submissions
Incorrect packaging hierarchies
Labeling discrepancies
These issues create additional work for Amazon receiving teams and can delay inventory availability. Amazon's compliance program is designed to encourage suppliers to provide accurate shipment data before inventory arrives.
Related Reading: How Amazon’s ASN Chargebacks Are Calculated
Top Strategies to Prevent Amazon ASN Chargebacks
Preventing ASN chargebacks starts with creating a repeatable process that emphasizes accuracy before a shipment leaves the warehouse.
Ensure Shipment Data Is Accurate
The most effective way to prevent ASN chargebacks is to ensure shipment information is accurate before transmitting the ASN.
Suppliers should verify:
Purchase order information
Item quantities
Carton counts
Pallet counts
Carrier information
Tracking details
Shipment dates
Expiration dates, when applicable
Even small discrepancies can create compliance problems once inventory arrives at an Amazon fulfillment center. Many organizations establish validation checkpoints before ASN submission to identify issues while they are still easy to correct.
Submit ASNs on Time
Timing plays a critical role in Amazon compliance. Amazon expects suppliers to submit ASNs quickly after shipment departure, so receiving teams have visibility into incoming inventory before it arrives. Late ASN submissions can trigger On-Time Non-Compliance (OTNC) chargebacks, even when shipment contents are otherwise accurate.
Timing issues often occur when:
Warehouse teams confirm shipments late
Carrier information is delayed
EDI transmissions fail
Manual processes slow ASN generation
Shipment schedules change unexpectedly
Suppliers can reduce risk by automating ASN generation when possible and regularly monitoring EDI transaction performance. Organizations that rely on manual ASN processes often experience higher compliance risk as shipment volumes increase.
Validate Unit Counts Carefully
Unit count mismatch chargebacks are among the most common ASN-related deductions that suppliers encounter. These chargebacks occur when the quantity reported in the ASN does not match the quantity Amazon receives.
For example, a supplier may report 1,000 units in the ASN while Amazon receives 980 units. Even if the discrepancy is accidental, the mismatch can trigger a compliance chargeback.
To reduce these issues:
Verify quantities before ASN submission
Reconcile warehouse counts regularly
Confirm carton contents during packing
Audit high-volume shipments
Investigate recurring quantity discrepancies
Consistent validation procedures help reduce errors and improve overall inventory accuracy.
Pay Close Attention to Expiration Dates
Expiration date accuracy is especially important for food, beverage, health, beauty, and other date-sensitive products. Missing, inaccurate, or improperly formatted expiration dates can create receiving delays and compliance deductions.
Expiration date information helps Amazon:
Rotate inventory correctly
Maintain regulatory compliance
Improve inventory visibility
Reduce spoilage
Protect the customer experience
A common challenge occurs when expiration date information exists within warehouse systems but is not transmitted correctly through EDI transactions. Suppliers should routinely test ASN data flows and verify expiration date information appears correctly throughout the process.
Organizations working with multiple facilities or third-party logistics providers should periodically audit expiration date procedures across locations to ensure consistency.
Monitor ASN Performance Trends
Preventing chargebacks requires more than fixing individual deductions. The most successful suppliers regularly review compliance performance to identify recurring issues and operational trends.
Monitoring ASN performance can help uncover:
Repeated unit count mismatches
Late ASN patterns
Facility-specific errors
Labeling issues
Packaging inconsistencies
EDI transmission failures
For example, if a majority of ASN chargebacks originate from a single warehouse, the issue may be related to local processes rather than broader compliance concerns. Looking for patterns often reveals opportunities for improvement that may not be visible when deductions are reviewed individually.
Building an Amazon ASN Compliance Process
Organizations with strong compliance performance typically view ASN accuracy as an operational discipline rather than a compliance task. Instead of reacting to deductions after they occur, they build preventative controls throughout the shipping process.
Pre-Shipment Validation
Before transmitting an ASN, suppliers should validate:
Purchase order information
Unit quantities
Carton counts
Pallet counts
Tracking information
Carrier details
Expiration dates
Labeling requirements
Automated validation tools can help identify discrepancies before they become chargebacks. The earlier an issue is identified, the easier and less expensive it is to correct.
Warehouse and Fulfillment Controls
ASN accuracy starts on the warehouse floor. If physical inventory, labels, and shipment documentation are inaccurate, the ASN will likely be inaccurate as well.
Strong warehouse controls typically include:
Standardized packing procedures
Shipment verification checkpoints
Barcode scanning processes
Label validation procedures
Employee training programs
Routine inventory audits
As shipment volumes grow, these controls become increasingly important for maintaining compliance performance.
Monitor EDI Transaction Health
EDI failures can create ASN issues even when shipment data is accurate. A delayed or failed ASN transmission can trigger compliance deductions if Amazon does not receive shipment information within the required timeframe.
Suppliers should routinely monitor:
Failed transmissions
Rejected documents
Processing delays
Integration issues
Trading partner errors
Visibility into transaction performance helps teams identify potential problems before they affect compliance metrics.
Related Reading: Compare and Contrast ASNs at Walmart and Amazon
Why ASN Accuracy Matters for Amazon Performance
Many suppliers focus on ASN chargebacks because of their financial impact. However, ASN accuracy affects much more than compliance deductions.
Accurate shipment information helps support:
Faster receiving
Better inventory visibility
Improved replenishment planning
Fewer receiving delays
Stronger operational performance
Better retailer relationships
Inaccurate shipment data creates friction throughout the supply chain. Over time, recurring errors can affect inventory availability, operational efficiency, and retailer confidence. Investing in ASN accuracy often produces benefits that extend well beyond chargeback prevention.
FAQs about Amazon ASN Chargebacks
What is an Amazon ASN chargeback?
An Amazon ASN chargeback is a compliance deduction issued when the information submitted in an Advance Shipment Notice (ASN) does not meet Amazon's requirements or does not match the inventory Amazon receives. Common causes include late ASN submissions, unit count mismatches, missing shipment information, and expiration date errors.
How can I avoid Amazon ASN chargebacks?
The most effective way to avoid Amazon ASN chargebacks is to ensure shipment information is accurate, complete, and submitted on time. Suppliers should verify quantities, carton counts, tracking information, carrier details, and expiration dates before transmitting the ASN. Regular monitoring of compliance trends can also help identify recurring issues before they become costly deductions.
How quickly should an ASN be submitted to Amazon?
Amazon generally expects suppliers to submit ASNs within 30 minutes of shipment departure or at least six hours before the scheduled delivery appointment at the fulfillment center. Missing these timing requirements can result in On-Time Non-Compliance (OTNC) chargebacks and receiving delays.
What is a Unit Count Mismatch chargeback?
A Unit Count Mismatch chargeback occurs when the quantity reported in the ASN differs from the quantity Amazon receives. These discrepancies can happen when inventory counts are inaccurate, carton contents are entered incorrectly, or shipment information is not updated before ASN submission. Consistent validation procedures and warehouse controls can help reduce these chargebacks.
Preventing Amazon ASN Chargebacks Starts with Operational Accuracy
Amazon ASN chargebacks are often the result of small process breakdowns that occur before a shipment reaches a fulfillment center. Inaccurate quantities, late submissions, expiration date errors, and missing shipment details can all contribute to compliance deductions.
Fortunately, most ASN-related chargebacks are preventable. Organizations that invest in shipment validation, warehouse controls, automated EDI processes, and ongoing performance monitoring are often better positioned to reduce deductions and improve operational efficiency.
Rather than viewing ASN compliance as a standalone requirement, suppliers should consider it part of a broader strategy to improve supply chain execution, inventory visibility, and retailer performance.
Related Reading: How to Dispute an Amazon Chargeback
Compliance Starts Before the Shipment Leaves the Warehouse
When shipment data is accurate, complete, and transmitted on time, suppliers are better positioned to avoid deductions and keep inventory moving efficiently through Amazon's network.
At SPS Commerce, we help suppliers simplify the operational side of compliance. By combining EDI automation, retailer expertise, and visibility across the world's largest retail network, we help businesses improve shipment accuracy, reduce compliance risk, and build stronger retail relationships.
