Cyber Monday orders appear on the sales dashboard as soon as customers check out. The final cost of delivering those orders can take longer to establish. By the time carrier invoices and fulfillment adjustments arrive, the discounts have already been granted and the advertising budget spent.
That timing gap can leave retailers celebrating sales that contribute far less than expected. Shipping becomes especially consequential when promotional pricing has already reduced the margin available to absorb delivery costs.
The problem reinforces a practical lesson: Shipping economics belong in promotional planning, and the estimates used to approve an offer need to reflect the charges the business will ultimately pay.
A retailer's average shipping cost can increase even when its contracted base rates remain unchanged. Promotions can change what customers buy, where they live and which inventory locations must fulfill their orders.
Package dimensions matter alongside physical weight. Dimensional-weight pricing accounts for the space a package occupies when that produces a higher billable weight than its actual weight. Depending on the carrier and service, handling fees, residential delivery charges and remote-area surcharges can further increase the total. Faster delivery promises may also require a more expensive service.
Packaging creates another important distinction. In our business, wheels are shipped in boxes, while tires generally travel without them. Even when shipping dimensions are comparable, unboxed tires can cost significantly more to deliver because they attract additional handling charges.
Those charges can range from $5 to $20 per tire. On a set of four, that adds $20 to $80 that might be absent from the initial quote and appear only on the final invoice.
The broader lesson applies to any retailer selling products with different packaging or handling requirements. Similar dimensions don’t guarantee similar shipping costs. Forecasts need to account for how each product moves through the carrier's network and how many separately handled items an order contains.
Exposure to Surcharges
A negotiated carrier rate provides a starting point, but it doesn’t necessarily fix the total delivery cost. Fuel surcharges can change independently of the contracted base rate, leaving retailers exposed to increases even while their rate agreements remain in place.
The customer-facing offer can remain fixed while the fuel component of the delivery cost rises, leaving the business to absorb the difference.
Peak-season demand surcharges add another layer. During busy promotional periods, carriers can apply additional charges on top of ordinary pricing. The effect depends on the service, shipment characteristics and agreement, so retailers need to review surcharge schedules as carefully as base rates.
Separating these costs in the forecast makes the problem easier to diagnose. Higher fuel fees, a shift toward products requiring additional handling and more distant delivery destinations each call for a different response. A single blended shipping allowance can conceal which cost is increasing.
Compounding Margin Pressure
During the seven-day promotional period from November 25 through December 1, 2025, USAWheels recorded a 225% increase in orders compared with the equivalent Tuesday-through-Cyber-Monday period in 2024. CanadaWheels recorded a 35% increase.
We combined manufacturer-funded promotions with an additional retailer-funded 10% storewide discount. Depending on the product, supplier program and existing promotional pricing, customer savings reached up to 40%. Manufacturers supported part of the offer, while our businesses funded the additional discount.
Our internal assessment showed an approximately 15% reduction in contribution margin compared with ordinary operating levels. We estimated that discounting accounted for roughly two-thirds of that impact, with higher advertising and shipping expenses together accounting for the remaining third.
Once a discount reduces the contribution available from an order, an unexpected delivery charge consumes a larger share of what remains. Strong order growth can amplify that pressure when fulfillment costs are repeatedly underestimated.
Customers have become accustomed to free shipping, making it difficult to pass every carrier increase through to them. Retailers must balance that expectation against costs that vary substantially by product and destination.
One structure offers free shipping on orders over $600 when shipping costs are no more than $150. If delivery costs exceed that amount, we cover the first $150 and the customer pays the difference. A $250 shipping cost therefore means a $100 customer contribution.
The minimum order value and shipping cap address different issues. The threshold establishes the basket size required to qualify. The cap limits the delivery expense the retailer agrees to absorb. An order-value threshold alone can’t account for unusually expensive destinations or products.
These terms, including any customer contribution, should be clear before the buyer commits. The retailer also needs a complete enough cost estimate to apply the cap accurately. If handling fees emerge only after dispatch, a limit calculated from an incomplete quote can still leave unexpected costs with the business.
Improving Fulfillment Decisions
Geolocation can evaluate warehouse locations against customers' delivery addresses. The resulting visibility helps to assess fulfillment options across a geographically dispersed supply network.
Location is one part of the decision. The comparison should include product cost, inventory availability, packaging-related handling fees and current carrier charges, alongside the promised delivery timeframe. A lower product price at a distant warehouse might result in a higher total cost than sourcing the same item closer to the customer.
Promotional demand can also change the available options. Early orders may be served from nearby stock. Once that inventory sells out, later orders may require a more distant warehouse or multiple fulfillment locations. The offer remains the same while its delivery economics change.
This makes the cost of fulfilling the next wave of orders particularly important. A campaign average can remain acceptable even as particular products or destinations become less profitable. National and international retailers need visibility into regional differences within each market they serve.
Build in the Full Delivery Cost
Before approving an offer, estimate contribution after discounts, product costs adjusted for confirmed supplier funding, advertising and other variable expenses, including fulfillment. Include handling fees, current fuel and peak-season surcharges, then account for any shipping payment collected from the customer. Evaluate both contribution dollars per order and contribution as a percentage of sales.
Test the promotion against changes in product mix and inventory availability. A campaign that attracts more products requiring special handling may incur higher delivery costs even if average basket value stays stable. More distant orders or higher fuel surcharges can create additional pressure.
During the event, assign an estimated delivery cost to every order, including those awaiting dispatch. Update that estimate when fulfillment details change, and reconcile it against the final carrier invoice. Recurring differences between quoted and invoiced costs should inform the next forecast.
Marketing, merchandising and supply-chain teams should review those results together through Black Friday, the weekend and Cyber Monday. They can then adjust future offers and advertising allocation toward products and regions that remain profitable to serve, while honoring existing customer commitments.
Free shipping is a promise to the customer with a variable cost behind it. Protecting Cyber Monday margin requires that cost to be understood when the promotion is designed and updated as orders arrive. By the time the final shipping invoice reveals the problem, many of the decisions that created it have already been made.
Saleh Taebi is founder and chief executive officer of CanadaWheels and USAWheels.
