When an order arrives in multiple boxes on different days instead of all at once, partial shipments sit in an awkward spot under commercial law: the Uniform Commercial Code treats a single complete delivery as the default, so splitting an order is technically an exception that gives the buyer real leverage over acceptance, rejection, and payment timing. The exact rights depend on whether the contract authorized installments, whether the sale is retail or commercial, and what the shipping terms say about who bears cost and risk.
The Single-Delivery Default
UCC § 2-307 sets the baseline. Unless the parties agree otherwise, the full quantity called for in a contract must be tendered in one delivery, and the buyer’s duty to pay is triggered only at that point.1Legal Information Institute. Uniform Commercial Code 2-307 – Delivery in Single Lot or Several Lots The same section carves out an exception: when circumstances give either side the right to make or demand delivery in lots, the seller can invoice each lot separately as long as the price is reasonably apportionable.
That “circumstances” language does a lot of work. A customer ordering twenty different items from a retailer with multiple warehouses has implicitly created circumstances where splitting makes sense. A manufacturer waiting on raw materials may not be able to deliver everything on day one. The point for buyers is that a silent contract puts the stronger position on your side: without an agreement allowing lots, you can hold out for complete delivery before paying.
Why Orders Get Split
Three practical drivers account for most partial shipments. Inventory spread across different fulfillment centers makes shipping from each location faster and often cheaper than consolidating. Product dimensions force the issue when heavy equipment can’t safely ride with small consumer goods and each item needs a carrier equipped for that load. And backorders push sellers to send what’s available now rather than hold the full order for weeks. None of these reasons automatically changes the buyer’s legal rights, but they do explain why the issue comes up constantly even in contracts written for single delivery.
What a Buyer Can Do When Only Part of the Order Arrives
Perfect Tender for Single-Delivery Contracts
If the contract called for one delivery and the seller ships only part of the goods, UCC § 2-601 gives the buyer three options: reject the entire tender, accept all of it, or accept any commercial units and reject the rest.2Legal Information Institute. Uniform Commercial Code 2-601 – Buyers Rights on Improper Delivery A commercial unit is the smallest grouping the trade treats as a single whole, such as a case of wine, a suite of office furniture, or a matched set of components.
A partial delivery is, by definition, a failure to conform to a contract that called for complete delivery. A buyer who ordered ten units and received six can reject all six, accept all six, or pick the units that meet specifications and send back the rest. That is a strong bargaining position, and sellers who split orders without the buyer’s agreement are effectively handing the buyer that leverage.
The Higher Bar for Installment Contracts
When the contract itself authorizes or requires delivery in separate lots, UCC § 2-612 applies and the standard tightens. A buyer can reject a particular installment only if the non-conformity substantially impairs the value of that installment and cannot be cured.3Legal Information Institute. Uniform Commercial Code 2-612 – Installment Contract Breach Minor defects or small shortfalls the seller can fix will not justify refusing the shipment.
The buyer gets a broader remedy when problems with one or more installments substantially impair the value of the whole contract: at that point the buyer can treat the entire agreement as breached.3Legal Information Institute. Uniform Commercial Code 2-612 – Installment Contract Breach A manufacturer receiving three consecutive shipments of defective components for its production line can cancel the remaining installments on that pattern, even if no single delivery was catastrophic on its own.
The Seller’s Right to Cure
Rejection is not always final. Under UCC § 2-508, a seller who delivers non-conforming goods can still fix the problem in two situations. If the time for performance has not expired, the seller may notify the buyer and make a conforming delivery within the original contract period.4Legal Information Institute. Uniform Commercial Code 2-508 – Cure by Seller of Improper Tender or Delivery Replacement Even after the deadline, if the seller had reasonable grounds to believe the original tender would be acceptable, the seller gets additional reasonable time to substitute a conforming delivery after giving notice.
A seller who shipped seven of ten units and genuinely believed the buyer would accept that split can cure by delivering the remaining three within a reasonable window, provided it acts promptly and communicates clearly. For buyers, that means a quick rejection notice does not necessarily end the transaction. Expect a cure attempt, and build it into your planning.
Risk of Loss Stays With the Seller
When a seller ships non-conforming goods and the buyer has the right to reject, risk of loss stays with the seller until it cures the problem or the buyer accepts.5Legal Information Institute. Uniform Commercial Code 2-510 – Effect of Breach on Risk of Loss If a partial shipment is damaged in transit and the buyer never agreed to split deliveries, the seller bears the financial loss, even under shipping terms that would ordinarily shift risk at the point of shipment. Buyers should document the condition of everything that arrives before deciding whether to accept or reject.
Notification Duties
UCC § 2-504 requires any seller who ships goods to arrange a reasonable transportation contract for the cargo, provide the buyer with any documents needed to take possession, and promptly notify the buyer of the shipment.6Legal Information Institute. Uniform Commercial Code 2-504 – Shipment by Seller A failure in notification or shipping arrangement is grounds for rejection only if it causes material delay or actual loss. For split orders, each package should come with tracking, a packing slip, and some indication of what remains outstanding. A box arriving with no communication about the missing items is exactly the scenario where this provision strengthens a rejection claim.
Consumer Orders and the FTC Timing Rule
Retail buyers get an additional layer of protection that commercial contracts don’t carry. Under the FTC’s Mail, Internet, or Telephone Order Merchandise Rule, sellers must have a reasonable basis to expect they can ship within the advertised time frame.7Federal Trade Commission. Mail, Internet, or Telephone Order Merchandise Rule When no time frame is stated, the default is 30 days from a properly completed order, or 50 days if the buyer applied for credit at the time of purchase.8eCFR. Mail, Internet, or Telephone Order Merchandise Rule
When a seller cannot meet the deadline for the unshipped portion, it must notify the buyer and offer the choice to consent to the delay or cancel and receive a refund. The consequences depend on the length of the expected delay:
- If the seller provides a definite revised shipping date within 30 days of the original deadline, the buyer is treated as having consented unless they actively cancel before the revised date.
- If the revised date is more than 30 days late, or the seller cannot give any date at all, the order is deemed cancelled unless the buyer expressly agrees to keep waiting.
A seller who fails to send the required notice must treat the order as cancelled and issue a prompt refund, defined as within seven working days for most payment methods, or within one billing cycle for credit card payments.8eCFR. Mail, Internet, or Telephone Order Merchandise Rule For partial shipments, each unshipped item effectively carries its own deadline. A consumer who receives three of five items and hears nothing about the remaining two has strong grounds for a refund on the missing portion.
This rule applies to retail mail, phone, and internet orders. Business-to-business contracts fall under the UCC analysis described above, not this rule.
Who Pays for the Extra Freight
Which side absorbs the shipping cost on each leg of a split order depends on the FOB terms. UCC § 2-319 defines two main arrangements:
- FOB Shipping Point. The seller’s obligation ends once the goods are in the carrier’s possession. From that point the buyer owns the goods and bears the cost and risk of transit.9Legal Information Institute. Uniform Commercial Code 2-319 – FOB and FAS Terms
- FOB Destination. The seller pays for transportation and carries the risk until the goods physically arrive at the buyer’s location.9Legal Information Institute. Uniform Commercial Code 2-319 – FOB and FAS Terms
Under FOB Destination, a seller who voluntarily breaks an order into three packages absorbs the freight for all three. The buyer did not ask for multiple shipments and should not pay for the seller’s logistics decision. Under FOB Shipping Point, the buyer technically bears transport cost from the dock, but standard commercial practice still puts the extra freight on the seller when the split results from the seller’s own inventory shortage. A buyer who explicitly requests expedited partial delivery should expect to cover the added cost.
How Invoicing and Payment Work Across Lots
Section 2-307 permits the seller to invoice each lot separately when the price can be reasonably apportioned.1Legal Information Institute. Uniform Commercial Code 2-307 – Delivery in Single Lot or Several Lots Most sellers invoice pro-rata: each shipment generates its own invoice covering only the items in that package, and the sum across all partial invoices should equal the original purchase order amount.
Payment terms like Net 30 or Net 60 generally run from receipt of each installment, not from the original order date. A buyer who gets one shipment on March 1 and another on March 20 has different payment deadlines for each. Compare every packing slip against its corresponding invoice before the payment window closes, because quantity discrepancies, substitutions, and pricing errors are far easier to resolve before payment than after.
Early Payment Discounts
Discount terms like “2/10 Net 30” apply to each invoice individually. When a single order generates three invoices across three weeks, each discount window starts from its own invoice date. A buyer who pays the first invoice within ten days earns the discount on that portion regardless of whether the other installments have arrived.
Partial payments within a discount period require an extra calculation. Because the invoice balance is a pre-discount amount and the payment reflects the post-discount price, the credited amount is larger than the check. A $500 payment on an invoice with a 2% discount reduces the balance by about $510.20 ($500 ÷ 0.98). Accounting teams tracking multiple partial invoices with overlapping discount windows need to handle each one separately. Batching them is where errors creep in.
Demanding Assurance When the Rest Hasn’t Shown Up
A buyer who receives one partial shipment and starts doubting whether the remainder will arrive has a tool beyond waiting. Under UCC § 2-609, when reasonable grounds for insecurity arise about the other side’s performance, the concerned party can demand adequate assurance in writing and suspend its own performance until that assurance arrives. If the seller fails to respond within a reasonable time, capped at 30 days, that silence is treated as repudiation, which lets the buyer cancel and pursue remedies.
Between merchants, both the reasonableness of the insecurity and the adequacy of any assurance are judged by commercial standards, meaning what a reasonable business in the same industry would expect. A buyer who orders specialty components, receives only a fraction, and then learns the seller’s supplier went bankrupt has strong grounds to demand written confirmation that the remaining units will ship on schedule. If no credible assurance comes back, the buyer is not stuck waiting indefinitely.