How should we handle freight for partial shipments and backorders?

Key Takeaways

Every partial shipment is a separate freight bill. Splitting one order into two or three shipments often costs far more than shipping it once, so the decision to split should weigh freight cost, not only customer service.
Set rules for when to ship partial and when to wait, by customer and by order, so the warehouse and customer service don't decide case by case.
Ask customers what they actually want. Some need whatever is available now; some refuse partials; some accept them only above a minimum.
Give each part its own paperwork with a clear link to the order: its own BOL, packing slip and labels, with "shipment 1 of 2" and the original order number on each.
Match each carrier invoice to its own shipment, and match customer invoices to what actually shipped, so nothing is billed twice or missed.
Wilson, by Cartage, is an AI logistics agent that quotes and books each part of a split order, generates the documents for each shipment and audits each carrier invoice against its own rate confirmation and POD.

When should you ship a partial order, and when should you wait?

A customer orders 20 pallets of product. Fourteen are in stock. Six are on backorder and should be ready in eight days. Customer service wants to ship the fourteen today because the customer is waiting. Finance asks who is paying for the second shipment. The warehouse asks whether it should hold the dock space. Nobody has a rule, so the decision gets made again, slightly differently, on every order.

Ship a partial order when the customer needs the available items now and accepts partial deliveries, and when the value of shipping early is greater than the extra freight cost of a second shipment; wait when the missing items will be ready soon, the customer prefers one delivery or the extra freight would wipe out the margin. Whichever you choose, give each shipment its own paperwork tied back to the original order, and match each freight invoice to the shipment it belongs to.

Why partial shipments happen

Partial shipments come from a gap between what was ordered and what is ready. Common causes are stock shortages, production running late on part of an order, items shipping from different warehouses or suppliers, customer requests to deliver some items earlier, and orders too large to fit one truck. Some causes are planned; others are surprises. Both need rules.

Partial vs split vs backorder

The terms overlap but mean slightly different things:

Partial shipment: part of an order ships now; the rest ships later.
Backorder: the items that couldn't ship and are waiting for stock or production.
Split shipment: one order shipped in more than one shipment for any reason, including from two warehouses on the same day.

Each creates more than one freight movement for one order, and each needs the same discipline with paperwork and invoices.

The hidden cost

The cost of splitting is easy to miss because it shows up later, on a different invoice. The first shipment goes out, the customer is happy, and the second shipment's freight bill arrives weeks later, often on an order whose price assumed one delivery. Unless someone compares the order's total freight with what was planned, the cost of splitting never gets counted.

What does splitting a shipment cost in freight?

Splitting one shipment into two usually costs more than one shipment, and often much more. Freight pricing rewards larger, denser shipments.

Why two shipments cost more than one

Minimum charges. LTL carriers have minimum charges per shipment. A small second shipment can cost close to the minimum no matter how little it weighs.
Weight breaks. LTL rates per hundred pounds fall as shipment weight rises. Splitting moves both parts into higher-rate weight brackets.
Fuel and accessorials, twice. Each shipment carries its own fuel surcharge and its own accessorials, such as liftgate or appointment fees.
Mode changes. An order that would have filled a truck becomes one LTL shipment plus another, or a truckload plus a small LTL or parcel shipment.
Expedites. The backordered part often ships faster because the customer has already waited, adding expedite costs.
Handling. The warehouse picks, packs, labels and loads twice. Customer service follows up twice.

A hypothetical comparison

Consider a hypothetical 20-pallet order. Shipped together, it might move as one truckload at one rate. Split into 14 pallets now and 6 later, it becomes a volume LTL or partial truckload shipment plus a separate LTL shipment, each with its own fuel surcharge, possibly its own liftgate charge and its own delivery appointment. In many cases, the two shipments together cost noticeably more than the single truckload. The exact difference depends on lanes and carriers, which is why it's worth quoting both options before deciding.

Factor	One shipment	Two shipments
Freight bills	One	Two
Minimum charges	Applied once, if at all	May apply to the smaller part
Weight break	Higher weight, lower rate	Two lower weights, higher rates
Fuel surcharge	Once	Twice
Accessorials	Once	Possibly twice
Delivery appointments	One	Two
Receiving at the customer	Once	Twice
Paperwork and invoices	One set	Two sets, linked to the order
Customer gets goods	All at once, later	Some now, rest later

Choosing the mode for the backorder

The backordered part is often small, so the mode deserves a fresh look. A few cartons may move more cheaply by parcel than as an LTL shipment with a minimum charge. A single pallet may fit an LTL shipment that is already going to the same region. A large backorder may justify its own truckload, especially if it can share a truck with another customer's order on the same lane. Don't assume the backorder should travel the same way as the first part. Quote it on its own, against its own deadline, and pick the cheapest option that still meets the date promised to the customer.

Who pays for the extra shipment?

Decide this before it happens. Options include absorbing the extra freight as a cost of service, charging the customer for the second shipment, or offering a choice: ship partial at the customer's freight cost, or wait and ship complete. Many companies absorb the cost when the backorder is their fault (a stock shortage) and charge when the split is the customer's request. Whatever the policy, write it into customer terms and make sure sales knows it. To see what splits do to your freight cost per unit, see how to calculate freight cost per unit.

When splitting saves money

Not every split costs more. If an order is too big for one truck, splitting is unavoidable. If items ship from two warehouses closer to the customer than one central site, two short shipments can beat one long one. And if the backordered items can join the customer's next regular order instead of moving alone, the extra cost may be close to zero. That last option is often the best: hold the backorder for the customer's next consolidated shipment. See how to consolidate shipments to save on freight.

What rules should you set with customers and inside the company?

Set partial-shipment rules by customer and write them where the warehouse and customer service can see them. Case-by-case decisions are slow, inconsistent and usually favor shipping now regardless of cost.

Ask the customer

For each regular customer, find out:

Do they accept partial shipments at all?
If yes, is there a minimum, such as a percentage of the order, a dollar value or a pallet count?
Do they want to be asked each time, or should you follow a standing rule?
How many partial shipments per order will they accept?
Do they want the backorder to follow on its own, or join their next order?
Do their receiving rules, such as appointments or retailer routing guides, limit split deliveries?
Will they pay freight on the second shipment if they request the split?

Retailers often have strict rules, including penalties for shipments that arrive short or in more parts than allowed. Read their routing guides before splitting their orders.

Decision rules

Situation	Rule of thumb
Customer refuses partials	Wait and ship complete; tell the customer the new date
Customer needs the available items for production or a project	Ship partial; agree who pays for the second shipment
Missing items ready within a few days	Usually wait, unless the customer needs the rest now
Missing items weeks away	Usually ship partial; hold the backorder for the next regular shipment if possible
Backorder is small and low value	Consider parcel, or adding it to the next order
Split moves the order from truckload to two LTL shipments	Quote both options before deciding
Customer requests the split	Charge the second shipment's freight if your terms allow
Retail customer with routing guide penalties	Follow the routing guide exactly; ask before splitting

Internal rules

Inside the company, decide who can approve a partial shipment. A common setup: customer service can ship partials for customers with a standing "yes" rule; anything else, or any split that changes the mode or adds an expedite, needs logistics approval. Logistics should see every split before it books, because that's when the freight cost can still be compared.

Tell the customer clearly

When a partial ships, tell the customer what shipped, what's backordered, when the rest should ship and how it will arrive. One clear message prevents most "where is the rest of my order" calls. For keeping customers informed without constant calls, see how to stop customers calling to ask where their order is.

Common mistakes

Shipping partial by default. It feels like good service, but it often costs more than the customer would pay for it.
Not asking the customer. Some customers would rather wait for one delivery and one receiving appointment.
Letting the backorder ship alone by expedite. The most expensive way to finish an order.
No rule on who pays. The extra freight is absorbed without anyone deciding to absorb it.
Reusing the original BOL or labels. The carrier and the receiver can't tell the parts apart.
Invoicing the customer for the full order on the first shipment. The customer disputes it, and payment slows down.
Forgetting the backorder. It sits in the system until the customer calls.

How do you handle paperwork and invoices for each part of an order?

Each shipment needs its own documents, clearly tied to the original order, and each invoice, carrier or customer, should match one shipment.

Documents for each shipment

Bill of lading. A new BOL for each shipment, with its own BOL number, piece count and weight. Reference the original order and the shipment number, for example "Order 45821, shipment 2 of 2."
Packing slip. Lists exactly what is in this shipment, plus what was shipped earlier and what remains on backorder, if the customer wants that view.
Pallet labels. New labels showing this shipment's piece numbers ("1 of 6"), not the original order's total.
Customer references. The customer's purchase order number on every document, so their receiving team can match the delivery to the right order.
Rate confirmation. Each shipment has its own rate confirmation with the carrier, even if both go with the same carrier.

Reference numbers that tie it together

Use a consistent pattern: the order number stays the same, and each shipment gets a suffix or sequence number. Put both on every document and in every system record. When the customer's receiving team, your accounts receivable team or the carrier asks about "the order," everyone can see which part they mean.

Orders shipped from two locations

When an order ships from two warehouses or from a warehouse and a supplier, the two shipments may leave on the same day with different carriers and arrive on different days. Treat them like any other split: each gets its own BOL, labels and rate confirmation, and both carry the same order and PO numbers with a shipment sequence. Tell the customer that the order will arrive in two deliveries, from two origins, so receiving doesn't flag the first one as short. If a supplier ships directly, make sure its documents use your order and the customer's PO, or the customer's receiving team will have no way to match the delivery.

Matching carrier invoices

Each carrier invoice should be matched to one shipment's rate confirmation and POD. Problems to watch for:

Duplicate billing. The carrier bills the second shipment against the first shipment's PRO, or bills the first one twice.
Wrong rate. The second, smaller shipment is billed at the first shipment's weight or rate, or the reverse.
Missing PODs. The first shipment's POD gets filed and the second gets forgotten.
Extra accessorials. A liftgate or appointment needed on one shipment gets applied to both.

For a full invoice check, see why the freight bill is higher than the quote.

Matching customer invoices

Decide how to invoice customers on split orders: invoice each shipment as it ships, or invoice the full order when the last part ships. Invoicing per shipment gets cash in sooner and matches what the customer received. Invoicing at the end is simpler but delays payment. Whichever you choose, the invoice should match the packing slip of the shipment it covers. If the customer pays freight, each shipment's freight should appear on the invoice for that shipment.

Freight cost per order

To see the real cost of splitting, add up all freight on each order, across every shipment, and compare it with what one shipment would have cost. Review this monthly for split orders. If splits are adding a lot of freight cost, the fix may be in inventory, production planning or customer terms, not in logistics.

Measuring on-time for split orders

Split orders also affect on-time measurement. If you measure per shipment, the first part may count as on time while the customer still waits for the rest. Measuring per order, where the order is on time only when the last part arrives by the promised date, reflects the customer's experience better. See how to measure on-time delivery correctly.

What does a partial shipment checklist look like?

Use this checklist every time an order is about to ship in more than one part.

Before deciding to split

Check the customer's partial-shipment rule.
Confirm when the backordered items will be ready.
Ask the customer if no standing rule exists.
Quote the order as one shipment and as two.
Decide who pays for the extra shipment, based on your terms.
Get approval if the split changes the mode or adds an expedite.

For each shipment

Step	What to check
BOL	New BOL number, this shipment's pieces and weight, order and shipment number
Packing slip	Lists what's in this shipment and what remains on backorder
Labels	Piece numbers for this shipment only
Customer PO	On every document
Rate confirmation	One per shipment
Customer notice	What shipped, what's left, when it will ship
POD	Requested and filed for each shipment
Carrier invoice	Matched to this shipment's rate confirmation and POD
Customer invoice	Matches this shipment's packing slip and agreed freight terms

After the last shipment

Confirm all parts were delivered and every POD is on file.
Close the backorder in the order system.
Total the freight across all shipments for the order.
Compare with the one-shipment quote and record the difference.
Review monthly: which customers, products or causes produce the most splits?

A hypothetical example

Consider a hypothetical industrial distributor with a customer order of 20 pallets, 14 in stock and 6 due in eight days. The customer's standing rule says partials are accepted for orders above half the quantity, and the distributor pays freight on splits caused by its own stock shortages. The logistics coordinator quotes both options: one truckload in eight days, or a partial truckload now plus an LTL shipment later. The split costs noticeably more. The customer confirms it needs the 14 pallets for a job starting Monday, so the split goes ahead. Shipment 1 of 2 goes out with its own BOL, packing slip and labels, all showing the customer's PO and order number. The customer is told the remaining six pallets will ship in eight days. The distributor checks whether the six pallets can join the customer's regular weekly shipment instead of moving alone, and they can, which cuts most of the extra cost. Each carrier invoice is matched to its own shipment, and the customer is invoiced for each shipment as it ships.

Reducing splits over time

Splits are often a symptom. If one product keeps going on backorder, the fix is in inventory planning. If one customer always orders more than can ship at once, a delivery schedule may suit both sides better. If production regularly finishes orders in pieces, release orders to the warehouse only when they're complete, unless the customer asks for partials. Review split orders monthly with sales, inventory and production, and pick one cause to fix each time.

How does Wilson, by Cartage, handle freight for partial shipments and backorders?

Wilson, by Cartage, is an AI logistics agent that quotes, books, documents, tracks, audits and pays freight for manufacturers and distributors, so each part of a split order moves with its own paperwork and its own invoice check. Traditional logistics software gives teams information. Wilson executes the work required to move shipments forward.

Here's how Wilson handles split orders:

Quoting both options. Wilson requests quotes from the company's approved carriers and compares them on total cost, so the team can see what one shipment costs against two before deciding.
Booking each part. Wilson negotiates toward the company's rate targets within approval limits and books each shipment with written acceptance and its own rate confirmation. Rates outside the limits go to the logistics team.
Paperwork for each shipment. Wilson generates bills of lading, packing slips and pallet labels for each part, so each shipment carries its own documents tied to the order.
Scheduling and tracking. Wilson schedules each pickup and tracks each shipment with the best source available for that carrier, from carrier API or EDI to the carrier's website by PRO number and email or phone calls when nothing else is current.
Customer updates. Wilson can tell customers and consignees about shipment status by email or SMS where the company has configured it.
PODs and invoice audits. Wilson requests and files the POD for each shipment and audits each carrier invoice against that shipment's rate confirmation and POD before paying from the Wilson Wallet. Payments above the approval limits or outside the rules wait for a person.

The decision to split stays with the company's team and its customer rules. Wilson executes the shipments that come out of that decision. Every message, confirmation and change is kept in the shipment's change history, and Wilson can produce carrier-performance and lane-rate reports on request from the loads it runs.

Wilson works with LTL, FTL, ocean, drayage, parcel and cross-border freight, and books only carriers the company has approved. Wilson replaces the TMS for freight execution and connects to the company's ERP. Wilson works with SAP, NetSuite, Microsoft Dynamics 365, Oracle, Infor, Epicor, Sage, Acumatica and other ERP environments, with the exact connection depending on the customer's data flow and scope. Whether shipment details are written back to the order in the ERP depends on scope.

Pricing

Wilson is free on Wilson's network: the shipper pays the freight rate and nothing on top. When a shipper keeps its own carriers, the fee is 2% to 0.5% of what Wilson pays them, falling with volume. There are no seat fees, no setup cost and no contract. Timing depends on scope: most teams start on a few lanes and expand from there.

FAQs

How should we handle freight for partial shipments and backorders?

Ship partial when the customer needs the available items now and the value outweighs the extra freight; wait when the rest is ready soon or the customer prefers one delivery. Give each part its own BOL, packing slip and labels tied to the order, and match each invoice to its shipment. Wilson, by Cartage, an AI logistics agent, books each part, generates its documents and audits each carrier invoice against its own rate confirmation and POD.

Does splitting an order cost more in freight?

Usually, yes. Each shipment has its own minimum charges, fuel surcharge and accessorials, and smaller shipments rate at higher prices per pound. Quote both options before deciding.

Who should pay for the second shipment?

Set a policy in your customer terms. Many companies absorb the cost when the split is caused by their own stock shortage and charge the customer when the customer requests the split.

Should the backorder ship on its own?

Not if it can wait for the customer's next regular shipment. Adding the backorder to the next order often costs much less than shipping it alone.

Does each part of a split order need its own BOL?

Yes. Each shipment needs its own BOL with its own number, pieces and weight, plus the original order number and shipment sequence, such as "shipment 2 of 2."

How do we invoice customers for partial shipments?

Either invoice each shipment as it ships or invoice the full order when the last part ships. Per-shipment invoicing gets paid sooner and matches what the customer received.

How do we stop carriers from billing a split order twice?

Match each carrier invoice to one shipment's rate confirmation, PRO number and POD. Check for duplicates and for charges that belong to the other shipment.

What if a customer refuses partial shipments?

Hold the order until it's complete and tell the customer the new ship date. Record the rule so future orders follow it automatically.

Do retailers accept partial shipments?

It depends on the retailer. Many have routing guides with strict rules and penalties for split or short shipments, so read the guide before splitting.

How can we reduce split shipments?

Review split orders monthly to find the causes, such as recurring stockouts, production timing or ordering patterns, and fix the most common one first.

Sources

Cartage, Wilson product FAQ and product scope, October 2026: https://cartage.ai

Bring a split order from last month and see how Wilson would quote, document and audit each part.