SW (Ship Window)

Amazon & D2C glossary · Harpy Media

The Ship Window is the required delivery date range on purchase orders: the earliest and latest dates within which goods are expected to arrive. Deliver too late and supply is disrupted; deliver too early and the receiving network is holding stock before it planned to.

What is SW?

The Ship Window is the required delivery date range on purchase orders: the earliest and latest dates within which goods are expected to arrive. Deliver too late and supply is disrupted; deliver too early and the receiving network is holding stock before it planned to.

Both directions carry consequences, which is what distinguishes a window from a deadline. The network plans capacity and replenishment around the window, so an early arrival consumes space and handling capacity that were allocated elsewhere — and it attracts the same kind of charge a late one does.

Why the window exists

Three reasons. Demand planning assumes stock arrives when it was planned to arrive, so the window keeps replenishment in step with forecast. Fulfilment capacity is finite and scheduled, so a window prevents congestion from unannounced arrivals. And inventory accounting depends on goods arriving in the right period, which matters for how the business reports and for how the network provisions.

For the vendor, that means the window is effectively a supply chain requirement written in calendar form. The dispatch plan has to be built backwards from the arrival range — including transit time, appointment availability, and a realistic allowance for variability — rather than forwards from whenever production finishes.

Hitting it consistently

Four practices. Plan dispatch from the delivery window backwards rather than from production completion forwards. Build the transport plan with margin, since variability in transit is what pushes consignments over the edge of a window in either direction. Confirm appointments properly, because an unbooked consignment cannot be received on time however punctually it arrives at the gate. And monitor compliance performance so that near-misses are visible before they accumulate into a pattern.

Where a window genuinely cannot be met, the productive move is early communication rather than hoping: an agreed adjustment is straightforward, while an unannounced delivery outside the window is a compliance event with a cost attached.

In practice

A vendor builds its dispatch schedule backwards from each delivery window, adding transport margin and booking appointments as soon as the plan is fixed. Consignments arrive inside the window consistently, compliance charges disappear from the settlement, and the replenishment the network planned for actually lands when it was planned.

How Harpy Media helps

Inbound scheduling is part of our operations work: dispatch planned from the required delivery window, appointments confirmed ahead, and compliance performance monitored so that near-misses get corrected before they become charges.

SW FAQ

What is a Ship Window?

The earliest and latest acceptable delivery dates on a purchase order. Goods arriving outside that range — early or late — can attract charges and disrupt planned inbound flow.

Why does early delivery matter?

Because the receiving network plans capacity around the window. Arriving early consumes space and handling capacity allocated elsewhere, and is treated as a compliance issue like a late arrival.

How do I hit it reliably?

Plan dispatch backwards from the delivery range with transport margin, book appointments as soon as dates are fixed, and if a window cannot be met, communicate early rather than delivering outside it.