Amazon FBA Partnered Carrier Program: How It Works When Your Inventory Ships From a Prep Center (2026)

Most guides to the Amazon Partnered Carrier Program assume you ship from your own warehouse. They say nothing about what happens when inventory lives at a prep center - where the seller creates the shipment plan, the prep center hands boxes to the driver, and the freight invoice goes back to the seller's Seller Central account. That split of responsibilities is where costly mistakes happen: failed pickups from address mismatches, weight reconciliation charges, LTL drivers refusing non-compliant pallets, and prep centers waiting on a PRO number the seller forgot to forward. This guide covers the full workflow as it actually runs, including the January 2026 change that made third-party prep the required path for all FBA unit prep and the April 2026 expansion that brought dangerous-goods sellers into PCP for the first time.

What the Amazon Partnered Carrier Program Is and Why It Exists

Amazon built PCP by negotiating national-contract rates with UPS for small parcel shipments, and with a pool of freight carriers for LTL and FTL moves. Because Amazon's aggregate shipping volume is enormous, it secures rates well below what a small or mid-size seller would pay booking the same service directly. Amazon passes most of that discount to sellers who use PCP and bills the freight cost through Seller Central - the seller does not write a check to UPS or a freight broker, the charge posts to their account after the carrier completes pickup.

That billing structure has one immediate consequence when a prep center is involved: the prep center is never the freight customer. They apply labels, build pallets, and hand cartons to the driver, but they do not book the carrier and they do not receive the invoice. Failed-pickup fees, weight reconciliation charges, and LTL reweigh adjustments all land on the seller's account, not the prep center's.

Starting January 1, 2026, Amazon stopped offering its own FBA prep and labeling services in the US. Every unit that ships to a fulfillment center now requires third-party prep before the carrier shows up - PCP and a prep center are required in sequence, not just convenient together.

SPD vs. LTL vs. FTL: The Breakpoints Every Prep Center Client Needs to Know

Amazon's three PCP modes each have distinct mechanics. Choosing the wrong one - or having your prep center discover you chose the wrong one after labels are printed - creates rework and delay.

Small Parcel Delivery

SPD uses UPS as Amazon's dedicated carrier. Each carton ships as an individual parcel with its own UPS tracking label. UPS enforces per-box limits on weight, length, and combined length plus girth - verify the current maximums in Seller Central before your prep center builds cartons, because boxes that exceed those limits cannot ship SPD and cannot be corrected on the floor without re-packaging.

A single SPD shipment plan also has a maximum carton count. If your prep center is building a large inventory batch above that cap, the seller must split into multiple separate plans before printing any labels. Discovering the overage after labels are printed means voiding and reprinting, which most prep centers charge for. High-volume sellers should confirm estimated box counts with the prep center before opening Seller Central.

LTL and FTL

LTL moves palletized freight on a shared truck. Amazon auto-assigns the lowest-cost available carrier from its freight network - you don't choose an LTL carrier the way you choose UPS for SPD. Seller Central's Send to Amazon workflow shows live PCP rate estimates for both SPD and LTL before you confirm, so the comparison is available before you commit. FTL applies to very high-volume shipments approaching a full trailer; most prep center clients stay in SPD or LTL range.

Mode	Carrier assigned by	Relative cost position	Pallet required	Tracking document
SPD	UPS (Amazon-dedicated)	Lower at small carton counts, higher at scale	No	UPS label per carton
LTL	Amazon's freight network	Lower per-lb at higher weight and carton counts	Yes - four-way forklift access required	PRO number
FTL	Amazon's freight network	Lowest at very high volume	Yes	PRO number and BOL

Who Creates the Shipment, Who Pays, Who Schedules the Pickup

Three parties share the PCP workflow when a prep center is involved. Mistakes almost always come from one party assuming another handled their piece.

The seller creates the shipment plan in Seller Central, selects mode and rate, enters the prep center's address as the ship-from location, downloads all required labels, schedules the pickup window, and forwards the PRO number to the prep center for LTL shipments. The prep center applies FNSKU labels, packs and seals cartons, builds pallets for LTL, applies FBA box-ID labels to cartons and FBA pallet labels to pallets, and physically hands freight to the carrier driver. The carrier picks up at the address in Seller Central; billing flows through Amazon to the seller's account.

Step-by-Step: Entering Your Prep Center as the Ship-From Address and Printing PCP Labels

This is the sequence the seller completes in Seller Central. The prep center cannot start this process, and freight cannot be tendered until it is done.

1. Log in to Seller Central and open Send to Amazon under the Inventory menu.
2. Add SKUs and quantities. Confirm that all unit-level prep will be performed by your prep center - Amazon's own FBA prep service in the US ended January 2026, so this step is not optional.
3. Proceed to shipping mode selection. Seller Central shows live PCP rate estimates for SPD and LTL side by side with self-ship rates. Review them before committing.
4. Select your mode, then confirm the exact street address - including suite or unit number - with your prep center directly before entering it in Seller Central. Do not rely on a saved address without verifying it is still current for this specific prep center.
5. Enter the prep center's address in the ship-from field, then choose the pickup date and window. Coordinate the window with the prep center before confirming - they need all cartons labeled and staged before the driver arrives.
6. Download all FBA box-ID labels and send them to the prep center. For LTL, include FBA pallet labels as well.
7. For LTL: locate the PRO number in Seller Central after Amazon confirms the freight request and send it to the prep center. This is the tracking ID the driver needs at pickup - it is not a UPS label and is entirely separate from SPD tracking documents.
8. Confirm the shipment in Seller Central only after the prep center has acknowledged receipt of all labels and confirmed readiness for the pickup window.

LTL Pallet and Freight Requirements Amazon Actually Enforces

LTL specs are enforced at pickup by the driver and again at the receiving dock. A pallet refused by the driver means a new pickup attempt, possible delay fees, and a prep center that now has to rebuild the freight.

Amazon requires standard wooden pallets with four-way forklift access - check Seller Central's current LTL requirements for exact footprint and grade specifications. Amazon's partnered LTL carriers do not accept floor-loaded freight under any circumstances. There are enforced maximums on pallet height and loaded weight per pallet; current figures are in Seller Central's LTL shipping requirements and should be confirmed directly before freight is built, not recalled from memory. Prep centers that are fluent in Amazon's LTL specs will measure and weigh before calling a shipment ready. Prep centers that are not will find out from the driver.

LTL labeling has two separate and equally enforced layers:

• FBA pallet labels must appear on all four sides of each pallet. A label missing from one side creates a check-in problem at the fulfillment center even if the other three sides are correct.
• Each carton stacked on the pallet still needs its own FBA box-ID label facing outward so it can be scanned individually at the receiving dock.

The PRO number ties the physical freight to the shipment plan. The prep center needs it in hand before the driver arrives. If the prep center cannot produce the PRO number at pickup, the driver may refuse the load. This is a document the seller retrieves from Seller Central and forwards - it does not reach the prep center automatically.

The April 2026 Hazmat Expansion: What Dangerous-Goods Sellers Can Now Ship via PCP

Before April 30, 2026, PCP access for dangerous goods was narrow - only certain lithium battery products qualified. On that date, Amazon extended PCP eligibility to all FBA-eligible dangerous goods. Aerosols, flammable liquids, oxidizers, and other regulated categories that previously required independently arranged freight can now move through PCP for the first time.

What the expansion does not change is the prep center's side of the work. Unit-level DG prep - correct hazmat labeling, proper inner packaging, secondary containment where required by the product category - must still be complete before any carton is tendered to the carrier. PCP expansion only changes how the freight is booked and billed, not what goes into building a compliant DG shipment.

Before scheduling the first DG shipment through PCP, confirm the following with your prep center:

• The prep center handles DG categories and is familiar with Amazon's DG packaging requirements for your specific product class.
• Correct UN-specification packaging for the product category is available and in stock at the prep center.
• Cartons will be built to applicable transport regulations - DOT or IATA depending on mode - before tender, not only to Amazon's internal packaging specs.

Rate Comparison: When PCP Wins and When Self-Ship or a Freight Broker Beats It

PCP wins on cost for most domestic SPD and LTL shipments. Amazon's national contract rates are well below retail UPS pricing and below typical broker rates for comparable lanes and weights. The gap is consistent enough that domestic sellers default to PCP unless they have a specific reason not to - and Seller Central makes the comparison visible before you commit.

PCP does not always win:

• Time-sensitive shipments where guaranteed transit windows matter more than cost may go through a direct carrier relationship or an expedite broker with the service-level agreement the seller needs.
• International sellers shipping from outside the contiguous US cannot use PCP and must arrange freight independently, regardless of how the inventory is prepped.
• Sellers with negotiated freight contracts at significant volume may have rates on specific lanes that are competitive with or better than PCP.
• Non-standard freight that doesn't fit PCP's mode specifications has no PCP option regardless of cost or destination.

The Send to Amazon rate comparison screen shows PCP and self-ship side by side before you confirm. If the self-ship rate is close, factor in pickup reliability for your specific prep center relationship and whether a broker gives you a service guarantee PCP does not.

The Five Mistakes That Cost Sellers Money in the PCP-Prep Center Workflow

• Wrong pickup address. The seller enters a saved or guessed address rather than verifying with the prep center. The driver goes to the wrong location. A failed-pickup fee posts to the seller's account - the prep center had nothing to do with the mistake and cannot reverse the charge. This is one of the most common and most avoidable errors in the entire workflow.
• Weight variance charges. The seller estimates carton weights from product data rather than actual packed weights. When the carrier weighs the cartons at pickup or at the dock, the variance triggers an automatic reconciliation charge. Prep centers that use calibrated scales and log actual carton weights before printing PCP labels prevent this surcharge entirely - ask yours whether that is part of their standard process before your first shipment.
• Missing PRO number. The seller books LTL, gets the PRO number from Seller Central, and forgets to forward it to the prep center. The driver arrives, there is no PRO number to hand over, and the pickup is refused or delayed. Build the PRO number handoff into your post-booking checklist as a hard step - it is a short message that prevents a significant problem.
• Pallets that fail driver inspection. Pallets that are too tall, overweight, not four-way accessible, or missing labels on one or more sides get refused at pickup. Confirm Amazon's current LTL pallet specifications with your prep center before the freight is built, not when the driver is already at the dock and the pickup window is closing.
• SPD cap splits done without planning. A seller with a large batch hits the per-plan carton limit and splits inventory arbitrarily. The result is duplicate shipments to the same fulfillment center under separate plans, redundant label sets, and sometimes inventory reconciliation problems at check-in. Split plans intentionally, grouping by destination FC where possible, and notify the prep center of the plan structure before they start building cartons.

Checklist for Prepping Your Prep Center to Use PCP Correctly

Organized by phase - because each item has a point in the workflow where catching it is inexpensive and a point where catching it creates significant rework. Work through these in order, not as a retrospective review after the plan is already confirmed.

Before opening Seller Central to create the plan:

• Get the actual carton count estimate from your prep center based on how they intend to pack the product, not an estimate from product dimensions alone. Prep centers sometimes pack differently than a weight-based estimate would suggest. If the count is near the SPD plan cap, decide on the split structure now - which SKUs go into which plan and which destination FC each plan targets - before any label sets are created.
• Verify the exact ship-from address, including suite or unit number, by contacting the prep center directly. Prep centers occasionally change suites, add locations, or use a different address for freight receiving than for general mail. A stale saved address is the leading source of failed-pickup charges, and neither Seller Central nor the prep center will flag the discrepancy automatically.
• For DG shipments: confirm the prep center handles your specific product class and has the correct UN-specification packaging in stock before creating the plan. Discovering a packaging gap after the plan is created and labels are printed means either delaying the shipment while the prep center sources materials or switching to a different provider mid-workflow - both are more disruptive than a pre-plan phone call.

After creating the plan, before confirming the pickup window:

• Send all label files to the prep center before confirming the pickup window. Confirming a pickup window before the prep center has labels in hand compresses their available prep time - if they are behind on labeling when the driver arrives, the pickup fails and the fee lands on your account regardless of who caused the delay.
• For LTL: coordinate the pickup date and window with the prep center verbally before clicking confirm in Seller Central. Check Seller Central's current policy on window changes before assuming a confirmed LTL pickup can be adjusted at no cost - the answer may affect how conservatively you should set the original window.
• Verify that carton weights in the plan are based on actual packed weights the prep center has measured on a calibrated scale. This is where the declared weight is locked in. Reconciliation charges are calculated against the figure you enter now, not against a corrected figure submitted later through support. Prep centers that log actual weights as part of their standard process can provide this data before you open the plan; those that do not are leaving weight reconciliation risk entirely in the seller's hands.

After confirming, before the pickup window opens:

• For LTL: forward the PRO number to the prep center and get written acknowledgment - a reply to your message, not an assumption that it was received. The prep center has no other mechanism to obtain this number, and the driver will not wait while someone searches their email for it.
• Confirm all cartons are sealed, labeled, and physically staged at least several hours before the pickup window opens, not the morning of pickup. A prep center still labeling cartons when the driver arrives cannot hold the truck, and rescheduling a missed pickup is slower than building time into the staging confirmation.
• For LTL: ask the prep center to confirm that pallet labels appear on all four sides before the driver is due. A photo of the staged pallets takes less than a minute to send and catches a missing label before it becomes a dock-check-in problem at the fulfillment center.

Frequently Asked Questions

Can my prep center create the PCP shipment plan in Seller Central on my behalf?

No. Only the seller's own Seller Central account can create FBA shipment plans and accept PCP rates. The prep center handles all physical work - labeling, packing, palletizing, and carrier handoff - but plan creation, carrier selection, address entry, and freight charges all belong to the seller's account. Some prep centers will walk clients through the Seller Central steps as a service, but they cannot operate inside your account.

What happens if the prep center isn't ready when UPS arrives for SPD pickup?

UPS will depart without the freight and Amazon will charge a failed-pickup fee to your Seller Central account. The next question - one that sellers often answer wrong - is whether to void the existing plan and create a new one, or to keep the plan open and request a new pickup window. In most cases the plan itself remains valid after a missed pickup and a new window can be scheduled through Seller Central without voiding anything. Voiding the plan means the prep center must re-label every carton with a new label set, which most prep centers charge for and which adds a full labeling cycle to your timeline. Log in to Seller Central, locate the affected shipment, and check whether a new pickup window can be requested before taking any other action. Contact Seller Central support if the option is not visible - do not void the plan as a default assumption.

How does a weight reconciliation charge work, and can I dispute it?

When the carrier's scale reading differs from the weight declared in your Seller Central shipment plan, Amazon automatically adjusts the freight charge to the actual weight and posts the difference to your account. You can dispute reconciliation charges through Seller Central if you have documentation - a calibrated scale log from your prep center showing actual packed carton weights is the most effective evidence. Prep centers that routinely log actual weights before printing labels provide this documentation as part of their standard process.

My products are classified as dangerous goods. Can I use PCP now?

Program-level eligibility and per-ASIN eligibility are separate. As of April 30, 2026, all FBA-eligible dangerous goods are covered by PCP at the program level - but each individual ASIN must still have its dangerous-goods classification reviewed and approved in Seller Central before any shipment plan, PCP or otherwise, can be created for it. If an ASIN's DG classification is pending, incomplete, or flagged for review, PCP will not be available for that product even though the April 2026 expansion is in effect. Check each ASIN's classification status in Seller Central's dangerous goods section before scheduling a shipment, and allow time for classification review if any ASINs have not been through that process. Once classification is confirmed, verify with your prep center that they handle your specific product class and have the correct UN-specification packaging in stock before booking the first shipment.

What if I need to split a large inventory batch across multiple SPD plans?

Map the full split structure before creating any plans - decide which SKUs and quantities go into each plan and which destination FC each plan targets. Grouping by destination FC matters because two plans sending the same products to two different fulfillment centers creates reconciliation work at check-in and may affect where your inventory appears in Amazon's network relative to demand. Give the prep center the plan structure in writing before they start building cartons, so each carton is staged under the correct plan from the start. If labels have already been printed and you realize a split is required, check Seller Central to determine whether you can void the plan partially or must void the entire plan - a partial void may preserve label work already completed, while a full void means the prep center relabels everything from scratch. Most prep centers charge for re-labeling, so understanding your options before acting avoids unnecessary cost.