Amazon 1P Chargeback: ASN Accuracy
ASN Accuracy
Amazon's ASN Accuracy chargeback fires when the Advance Ship Notice transmitted via EDI doesn't match what the fulfillment center physically receives. The comparison runs at the unit level: wrong quantities, missing expiration dates, invalid tracking numbers, or a late submission all trigger it. Vendors can dispute through Vendor Central within 30 days of the chargeback notification.
Sourced from Amazon's publicly referenced chargeback categories via SupplyPike/SPS Commerce and Consulterce, August 2026. Fee percentages are vendor-reported and may shift between regions and program updates.
What Amazon is claiming
If one bad field slips into your Advance Ship Notice, you rarely take a single hit. Amazon's ASN Accuracy chargeback applies per shipment, not per PO. One shipping error can multiply into a charge for every PO folded into that shipment.
- Amazon compares what your ASN declared against what the fulfillment center physically counted, at the unit level. That comparison is broader than a simple quantity mismatch.
- A missing Amazon Reference Number, a missing expiration date, or a wrong tracking number all trigger an ASN Accuracy chargeback, the same as a quantity error.
- Amazon groups several distinct failure modes under the ASN Accuracy umbrella. Each one you miss on a shipment adds its own charge on top of the others.
- Because the chargeback applies per shipment, a multi-PO delivery built on one bad ASN can generate a separate charge for every PO it carries.
What actually causes it
- Physical / Warehouse
- The warehouse picked or packed a quantity that doesn't match what the ASN declared. Most common version: the ASN was generated from the order quantity, but the actual pick came up short or substituted a different pack configuration.
- Carrier / Logistics
- A carrier-related tracking mismatch. The ASN carries a PRO or BOL number that doesn't match what Amazon's receiving system expects, or the shipment arrives at a different fulfillment center than the one the ASN was routed to.
- ERP / Data Bridge
- The ASN was generated from the sales order or PO confirmation rather than the confirmed pick-and-ship event. Vendors report this as the most common root cause: the ERP fires the 856 before the warehouse has finished confirming what actually went on the truck.
Is it disputable?
Amazon allows disputes through Vendor Central within 30 days of the chargeback notification. The path runs through Reports, then Operational Performance, then the defect list for the specific shipment. Select the transaction and submit supporting documentation. You get two dispute attempts per chargeback. If the first is denied, you can file again with additional evidence within 30 days of the denial. Multiple vendor sources confirm this 30-day window and the two-attempt limit.
Evidence you'll need
Gather this before you file, not after:
- The EDI 856 ASN transmission log, showing exactly what was declared per unit and per carton
- Warehouse pick-confirm or ship-confirm records showing the actual quantity that left the dock
- Carrier PRO/BOL documentation matching the shipment to the correct fulfillment center and tracking number
- For expiration-date chargebacks: lot and expiration records from the warehouse management system for the specific units shipped
How to stop it recurring
Recovering one deduction is worth less than removing the cause. What closes this one out for good:
- You build Amazon's ASN Accuracy chargeback risk into the shipment the moment you generate the ASN from the order instead of the confirmed pick. The order says what should ship. The pick confirms what did. If those two numbers disagree, the ASN you built from the order is wrong before it ever transmits to Amazon.
- Submit your ASN to Amazon within 30 minutes of the shipment leaving your facility, or at least 6 hours before the scheduled delivery appointment at the fulfillment center. Miss either window and you trigger On-Time Non-Compliance, a distinct ASN Accuracy sub-type. That penalty applies regardless of whether the rest of the ASN content was accurate.
- Include expiration dates on every consumable or perishable SKU you ship to Amazon. A missing expiration date is a distinct ASN Accuracy chargeback sub-type, not an optional field Amazon ignores.
- Validate the ARN (Amazon Reference Number) and PRO/BOL tracking numbers against what your carrier actually assigned before you transmit the ASN. A reference-field error triggers the same Amazon ASN Accuracy chargeback as a wrong quantity.
When your ERP fires the ASN from the sales order instead of the confirmed pick, it generates Amazon's ASN Accuracy chargeback on the next shipment. Vendor sources describe this as the most common root cause. Close it by gating EDI 856 generation behind the warehouse ship-confirm event, not the sales order confirmation or pick release. That way, your ASN payload (the unit quantity in the SN1 segment) pulls from the confirmed-pick record instead of the original PO quantity. Add a pre-transmission validation that compares the 856's declared quantity against the ship-confirm quantity and blocks transmission on any mismatch. For consumables, require a non-null expiration date on every item line before the 856 can generate.
You did everything right on this shipment. The PO shipped complete. The truck hit its appointment window. The fulfillment center signed for it on schedule. Then a chargeback for ASN Accuracy shows up in Vendor Central anyway, and it isn’t one line. It’s several, stacked against a shipment that physically arrived intact.
If you run supply chain, finance, or ops for a CPG supplier doing $10M-$500M in Amazon volume, this is the chargeback that eats margin on shipments you’d otherwise call clean. It isn’t a warehouse failure. It’s a data mismatch between what your Advance Ship Notice declared and what the fulfillment center counted. Amazon bills you for it as a recurring cost against every shipment carrying the same defect.
Amazon’s chargeback program is at least more transparent than most retailers’ deduction systems. The categories are published. The dispute path is documented in Vendor Central. Chargebacks show up in a structured report rather than buried in a remittance line.
That transparency cuts both ways. There’s less ambiguity about what you owe and why, and less room to argue you didn’t know the rules.
The ASN Accuracy chargeback is where most of the money concentrates for suppliers who already ship on time, precisely because the failure isn’t in the truck. It’s upstream. The failure mode is almost always the one described in the EDI 856 breakdown: your ASN was built from what should have shipped, not from what did. Amazon charges you for that gap more explicitly than retailers who bury it in a shortage code thirty days later.
Five sub-types roll up under ASN Accuracy, and each one fires independently against your account:
- On-Time Non-Compliance (OTNC): the ASN arrived after the truck did.
- Unit Count Mismatch: the ASN quantity doesn’t match the physical count.
- Invalid or Missing ARN: the Amazon Reference Number is wrong or absent.
- Missing Expiration Date: consumable SKUs shipped without expiration data in the ASN.
- PRO/BOL Mismatch: the carrier tracking information doesn’t match the shipment.
A single shipment can trigger more than one against you. A late ASN with a wrong quantity is two chargebacks, not one.
Amazon gives you 30 days from the chargeback notification to file a dispute in Vendor Central, the shortest window of the four major retailers. The deduction code hub covers other retailer chargeback types and how they compare to what you’re dealing with here.
How much is this code costing you a year?
The calculator takes your shipment volume and deduction rate and returns an annual exposure figure. No email required.
Frequently Asked Questions
- How much does an Amazon ASN Accuracy chargeback cost?
- Vendor sources report Amazon's ASN Accuracy chargeback runs 2-6% of COGS, varying by region and severity. The range is wide because Amazon groups several sub-types under the same umbrella: a late ASN and a unit count mismatch carry different penalties. Specific fee schedules are visible in your account's Operational Performance reports in Vendor Central.
- What's the difference between an ASN Accuracy chargeback and a PO On-Time Accuracy chargeback?
- Both are Amazon vendor chargebacks, but they measure different things. ASN Accuracy measures whether your Advance Ship Notice matches what physically arrived. PO On-Time Accuracy measures whether you shipped on time and in full against the purchase order. You can pass one and fail the other. A shipment that arrives on schedule but whose ASN declares the wrong unit count triggers ASN Accuracy, not PO On-Time.
- How long do I have to dispute an Amazon ASN chargeback?
- You get 30 days from the ASN Accuracy chargeback notification in Vendor Central to dispute it. You also get two dispute attempts per chargeback. If the first is denied, you can refile with additional documentation within 30 days of the denial.
- Does Amazon send an 824 or rejection notice for a bad ASN?
- Not the way traditional EDI retailers do. Amazon accepts your ASN and compares it against the physical receipt at the fulfillment center afterward. The ASN Accuracy chargeback shows up in Vendor Central's Operational Performance reports, not as a real-time EDI rejection. By the time you see it, the shipment is long received.
Sources and verification
- SupplyPike / SPS Commerce — What Are Amazon's Compliance Chargebacks? : SECONDARY. Deduction-management vendor content. Identifies five ASN Accuracy sub-types (OTNC, Unit Count Mismatch, Invalid/Missing ARN, Missing Expiration Date, PRO/BOL Mismatch) and describes the unit-level measurement basis.
- Consulterce — The Complete Guide to Amazon Chargebacks in 2026 : SECONDARY. Independent vendor source. Reports 2-6% of COGS fee range across regions, confirms the 30-day dispute window and Vendor Central dispute path (Reports, Operational Performance, defect list). Provides the most complete cross-regional fee table found across sources.
- SupplyPike / SPS Commerce — Amazon ASN Accuracy: Your #1 Defense Against Shipping Chargebacks : SECONDARY. Same vendor family as source 1, separate article focused specifically on ASN prevention. Corroborates the 30-minute submission window, 30-day dispute deadline, and two-attempt dispute limit independently.