Shipping to Amazon FBA in 2026: prep, labels, fees, and IPI

Before your first inbound shipment

FBA enrollment happens at the SKU level, not the account level. After your Seller Central account is in good standing, you convert each ASIN to FBA inventory through Manage Inventory, then create an inbound shipment plan. The shipment plan is what Amazon uses to assign destination warehouses, generate FNSKU labels, and apply prep requirements^[1].

Two settings matter on day one. First, set Stickered (FNSKU) rather than Commingled (Manufacturer Barcode) under Edit Listing. Commingled inventory pools your units with other sellers offering the same UPC, which exposes you to counterfeit risk and authenticity claims you cannot defend^[2]. Second, set the prep owner. If you let Amazon prep, fees range from a few cents per unit for poly-bagging up to roughly $2 per unit for specialty prep, and the unit can sit in a prep queue for several days before going sellable.

FNSKU labels and unit prep

Every sellable unit needs an FNSKU (Fulfillment Network Stock Keeping Unit) label. The format is X00 followed by 8 alphanumeric characters, encoded as Code 128 barcode. Amazon generates the FNSKU when you enroll the ASIN in FBA. The label must include the FNSKU barcode, the title or short description, and the condition (New, Used, Refurbished). Amazon recommends 1 inch by 2 inch or 1 inch by 3 inch labels printed on white thermal or laser stock^[3].

Place the FNSKU on a flat surface, oriented so a single scan captures the entire barcode. Cover or remove every other scannable barcode on the unit, including manufacturer UPC and any preexisting FNSKU from a different ASIN. If the unit is in a poly bag, the FNSKU goes on the outside of the bag, not on the product inside.

Amazon also enforces a 3-foot drop test for any unit shipped without an outer carton. If the unit fails, Amazon will charge a per-unit unplanned prep fee plus a packaging fee, or it will refuse the unit at receive^[4].

Hazmat review and dangerous goods

Amazon defines dangerous goods (DG) more broadly than DOT. Lithium batteries, aerosol sprays, perfume, nail polish, magnets, lighters, and many cosmetics fall under Amazon hazmat review. The first time you send a SKU classified as potentially hazardous, Amazon flags it for review and you must upload either an exemption sheet or a Safety Data Sheet (SDS) through Seller Central^[5].

Review takes 4 to 7 business days. The SKU stays unsellable for the entire review window even if inventory is on the floor. Submit the SDS or exemption form before you ship the first unit, not after, so the review clock runs in parallel with transit.

Building a compliant inbound shipment

Amazon distinguishes Small Parcel Delivery (SPD) for individual cartons under 50 pounds and Less Than Truckload (LTL) for palletized shipments. Carton labels are 4 by 6 inch FBA shipment ID labels generated by the shipment plan. Each carton can hold a single SKU or be a mixed-SKU box, but mixed boxes pay a per-unit processing fee.

1. 1
   Create the shipment plan
   Pick Case-Packed if every carton holds the same SKU and quantity, or Individual if cartons are mixed. Amazon assigns destination warehouses based on placement service.
2. 2
   Apply unit-level FNSKU labels
   Cover existing barcodes. Confirm the printer DPI is at least 203 so the Code 128 barcode scans on the first try.
3. 3
   Apply prep (bag, bubble, set marking)
   If you let Amazon prep, the unit stays in queue at receive and is not sellable until prep is done.
4. 4
   Print carton labels and bill of lading
   FBA shipment ID label goes on a flat side of the carton. The shipment ID barcode must be unobstructed by tape.
5. 5
   Book carrier (Amazon Partnered or self-arranged)
   Amazon Partnered Carrier rates are usually competitive on small parcel and middle-mile LTL. Confirm pallet count, dimensions, and PO number on the bill of lading.
6. 6
   Track receive and reconcile
   Receive can take 1 to 14 days. Run a reconcile report 30 days after the close-out and file a Contact Us case for any unit-level shortages.

Pallet specs matter. Standard 40 by 48 inch GMA Grade A wood pallets, single SKU per pallet for case-packed, max 72 inches tall including the pallet, max 1,500 pounds including the pallet^[6]. Cartons stacked column-style, not interlocked, with corner boards and stretch wrap from the deck up. Mislabeled or overweight pallets get assessed unplanned services fees and routinely sit in the dock yard for days.

Inbound placement service fees

In March 2024 Amazon introduced inbound placement service fees that charge sellers for the cost of distributing inventory across the FBA network. Sellers choose between three options at shipment creation: Minimal Shipment Splits, Partial Shipment Splits, and Amazon Optimized Shipment Splits. The cheaper option ships everything to one or two destinations and Amazon redistributes for you, charged as a placement fee. The free option requires you to split the shipment yourself across many warehouses^[7].

For most small and mid-size sellers, accepting the placement fee is cheaper than the extra freight cost of running 5 to 8 separate truckloads. For high-volume brands shipping pallet quantities, splitting at origin is usually the cheaper path, because the placement fee scales with unit count.

“Inbound placement service fees apply per-unit, vary by size tier, and stack on top of base fulfillment fees and storage fees.”

IPI score and storage limits

The Inventory Performance Index (IPI) is Amazon’s 0 to 1,000 score that measures how well you manage FBA inventory. Four inputs drive it: excess inventory, sell-through rate, stranded inventory, and in-stock rate. The threshold has bounced between 400 and 500 over the years. As of late 2025, the published threshold is 400. Below 400, Amazon caps your storage volume by storage type^[8].

The lever you actually control week to week is stranded inventory. Stranded means a unit is in an FBA warehouse but the listing is suppressed (image issue, restricted keyword, missing safety attribute). Run the Fix Stranded Inventory report every Monday and resolve everything within 30 days, because stranded units past 30 days count double against IPI.

FBA fee structure for 2026

FBA fees in 2026 stack as: base fulfillment fee (per-unit, by size and weight tier), monthly storage fee (per cubic foot, by size tier and season), inbound placement service fee (per-unit, by tier and split option), low-inventory-level fee (per-unit, triggered when historical days of supply falls below 28), aged inventory surcharge (271+ days in network), and returns processing fee for high-return categories like apparel and shoes^[9].

The biggest 2024 to 2026 swings have been on bulky and oversized fulfillment, where per-unit fees moved more than 20% in two years. Brands selling pillows, bedding, cookware sets, and outdoor gear should rerun unit economics every quarter, not once a year.

Multi-Channel Fulfillment for off-Amazon orders

Multi-Channel Fulfillment (MCF) lets you fulfill Shopify, TikTok Shop, eBay, and wholesale orders from your existing FBA inventory. The order is created via API or through the Seller Central order entry page, Amazon picks and packs from FBA stock, and ships through their carriers in unbranded boxes (or Amazon-branded if you do not opt out)^[10].

MCF unit costs are notably higher than a dedicated 3PL. Pricing is delivery-speed tiered: Standard (3 to 5 days), Expedited (2 days), and Priority (1 day). For a small standard 12 oz unit shipping to most of the US, MCF Standard is roughly $7 to $9 per order, while a dedicated 3PL with USPS Ground Advantage can be in the $5 to $6 range. The trade-off you are buying is one inventory pool and one set of SKUs to manage.

Common chargebacks and how to prevent them

Amazon vendor and seller chargebacks are documented in the Vendor Manual (for 1P Vendor Central) and the Inbound Performance dashboard (for 3P FBA). The four categories that account for the majority of dollars assessed:

Box-level content (which units are in which carton) must be provided before the carrier picks up. Amazon strongly prefers the 2D barcode on each carton because it scans at receive and skips manual sorting. Sellers who upload box content via spreadsheet still face manual processing fees per unit^[11].

“Sellers shipping floor-loaded mixed cartons without 2D barcodes are subsidizing the sellers who invest in proper carton-level prep.”

Building an FBA-ready operation

Most brands fail FBA prep not because the rules are obscure, but because their internal handoffs are sloppy. The supplier ships pallets to a 3PL, the 3PL preps and ships to FBA, and somewhere in those two transfers the FNSKU mapping breaks. The three controls that fix this:

• One source of truth for FNSKU. Maintain an internal SKU master that maps your supplier UPC, your DTC SKU, and the Amazon FNSKU. Make this the file your 3PL prints labels from.
• Outbound QA at the 3PL. A 1% sample at outbound that confirms FNSKU match, prep type, and case-pack count catches almost every receive exception before the truck leaves.
• Inbound dashboard review every Monday. Open Seller Central, check the Inbound Performance widget, the Stranded Inventory list, and the Restock Recommendations. Fifteen minutes a week prevents 80% of preventable fees.

What changed in 2025 to 2026

Amazon’s 2024 fee announcement carried into 2025 with the addition of the low-inventory-level fee for standard-size products under 28 days of supply. The policy is intended to push sellers to keep FBA stocked through demand peaks, but it has been controversial because it can charge sellers for selling through too quickly^[12]. The current carve-outs include new ASINs in their first 365 days and small parcel SKUs with very low absolute inventory thresholds.

On the prep side, Amazon expanded its Prep Help service through several mid-tier warehouses in 2025, but at a higher per-unit rate than seller-arranged prep. For most operators, sending pre-prepped units from a 3PL remains the cheapest path. For brands launching their first SKU on Amazon, paying Amazon to prep your first shipment is a reasonable bridge while you set up a prep partner.

Quick-reference compliance checklist

1. [src-1]Send inventory to Amazon (Seller Central Help)— Amazon Seller Central
2. [src-2]Eligibility for stickerless commingled inventory— Amazon Seller Central
3. [src-3]FBA product barcode requirements— Amazon Seller Central
4. [src-4]FBA prep service guidelines— Amazon Seller Central
5. [src-5]Dangerous goods identification (FBA)— Amazon Seller Central
6. [src-6]Pallet shipments to Amazon fulfillment centers— Amazon Seller Central
7. [src-7]Inbound placement service fees announcement— Amazon Seller Central
8. [src-8]Inventory Performance Index— Amazon Seller Central
9. [src-9]FBA fulfillment fees and storage fees schedule— Amazon Seller Central
10. [src-10]Multi-Channel Fulfillment overview— Amazon
11. [src-11]Box content information requirements— Amazon Seller Central
12. [src-12]Amazon FBA inbound placement fee coverage— Supply Chain Dive