Delivery windows
MABD, explained: what Must Arrive By Date means and how to hit it
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MABD stands for Must Arrive By Date: the date on a purchase order by which the receiver expects the goods at its dock. It is a receiving deadline, not a ship date. Retailers and distributors measure deliveries against it, sometimes as a window rather than a single day, and deliveries that miss it, early or late, can trigger deductions.
Must Arrive By Date is set by the buyer, not the shipper. It answers one question: when does this purchase order need to be on the receiver's dock? Depending on the retailer or distributor, it may be a single date, a target date, or a window of days. What it never is: the day your freight leaves. Transit is your problem to solve backward from the MABD, and that is the whole game.
Most first-delivery confusion comes from a PO carrying several dates that sound alike. In the order they occur:
The trap is treating these as one date. A carrier told the ship date will leave on time and still miss the MABD. A carrier told the MABD with no appointment booked will arrive on time and sit in the yard.
Some programs state MABD as a day. Others define a window around it, and windows cut both ways. One widely cited example is a large retailer's three-day window, described by SPS Commerce as delivery up to three days before or on the MABD. Deliver the day after and you are late. Deliver four days early and you are also outside the window. In the natural channel, UNFI and KeHE define their delivery windows in their routing guides, which is where to confirm yours.
MABD is measured at the receiver's dock, not at yours. Everything between your dock and theirs is your responsibility.
The useful way to read an MABD is right to left. Start at the arrival window, subtract the appointment lead time the receiver requires, subtract the lane's transit time, subtract a buffer for the things that go wrong, and what is left is your real ship-by date. If the MABD is the 15th, the receiver books appointments several days out per its routing guide, the lane runs two transit days, and you want a day of margin, your freight leaves around the 12th and the appointment request goes in the week before. The arithmetic is simple. The discipline is doing it before the PO is accepted, not after.
A full truckload runs one origin to one destination and either hits the window or does not. LTL is harder, and retail consultancies say so plainly: a shared trailer makes more stops, every stop is a delay risk, and a small supplier moving a few pallets is the one most likely to miss. That is not an argument against LTL. It is an argument for planning LTL with transit and appointment built in, choosing carriers with reliable schedules on the lane, and for temperature-controlled product, using refrigerated LTL carriers whose schedules match the window. For brands with steady volume into one distributor, retail consolidation trades some flexibility for fewer stops and a firmer arrival.
They are not the same thing, though they travel together. MABD is a date. OTIF, On Time In Full, is a scorecard: on time means inside the MABD window, in full means the complete order. A delivery can be on time and still fail OTIF because cases were short. Walmart folded MABD into OTIF when it launched the program, and most large retailers now measure suppliers this way. See what a UNFI or KeHE chargeback actually costs for where the deductions land.
UNFI and KeHE set delivery windows in their routing guides and enforce them through appointment desks. The mechanics are the same as at any distributor: the PO names the DC, the DC sets the window, the appointment has to fall inside it. Where the receiving facility itself is a variable, and in California it often is, see shipping to UNFI and shipping to KeHE.
A carrier no-show or a storage failure does not automatically cost you the MABD. What costs you the MABD is silence. The receiver's scheduling desk hears from you before the window closes, not after, and a proactively rescheduled appointment is a different conversation than a missed one. The no-show recovery playbook covers that first hour.
If you have a PO with an MABD and are not sure the lane can make it, send us the dates and the DC, or call (909) 304-1068. Fr8topia is a licensed freight broker, and working backward from a delivery window to a workable ship date is the first thing we do on every quote.
Early is late. Programs that define an MABD window penalize deliveries before it as well as after it, and a carrier who prides itself on getting there early can hand you a deduction. The window is the target, not the date.
And the appointment is what your carrier actually hits. If the receiver's scheduling desk cannot give you a slot inside the MABD window, the MABD is already missed no matter when the truck leaves. Book the appointment when you accept the PO, not when the freight is on the dock.
Whether you work with Fr8topia or anyone else, these questions separate a broker who plans to the window from one who quotes a lane and hopes:
MABD means Must Arrive By Date. It is the date, or window of dates, by which a retailer or distributor expects a purchase order to arrive at its receiving facility. It is measured at the receiver's dock, so the shipper has to work backward through appointment lead time and transit to find the real ship-by date.
SOB means ship on or before. It is the latest day the order should leave the shipper's dock, and it sits alongside the MABD on a purchase order. The two are different deadlines: SOB governs when freight departs, MABD governs when it arrives.
Generally yes: ship-by and ship on or before include the named day. The governing document is the buyer's routing guide, and some programs measure the ship date by the carrier's pickup scan rather than by your dock time, so when in doubt, ship a day early.
The bill of lading should carry the actual date the carrier took possession of the freight, along with the purchase order number and the ship-to facility. It is the record a receiver checks against the ship window, so it should reflect what happened rather than what was planned.
Walmart uses MABD inside its On Time In Full program, where on time means delivered within the MABD window and in full means the complete order. Window specifics have changed over the years and are set in Walmart's supplier documentation, which is the source to confirm current terms.
MABD is a date. OTIF is a scorecard. On Time In Full measures whether a delivery arrived inside the MABD window and whether the full order arrived, and suppliers are typically scored on both. A delivery can meet the MABD and still fail OTIF if cases are short.
MABD definition, single-date versus window practice, and the LTL compliance challenge: 8th and Walton, "What Is Must Arrive By Date (MABD)?", June 30, 2021, retrieved September 5, 2026. Three-day window example: SPS Commerce, "OTIF: How To Meet Delivery Appointments," May 24, 2024, as summarized in search results retrieved September 5, 2026. Purchase order date definitions including DNSB: iNymbus, "Walmart Must Arrive By Date (MABD) Explained," as summarized in search results retrieved September 5, 2026. Frequently asked questions drawn from Google People Also Ask results for MABD queries, September 5, 2026. Distributor window specifics are governed by the current UNFI and KeHE routing guides and are not reproduced here. Fr8topia service claims limited to what is published at fr8topia.com as of the same date.
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