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Card class: Hero • Category: Shipping & Courier

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At a glance

Absolute count of Japan Post consignments delivered after the published estimated delivery date for the service tier, in the trailing 7 days. Domestic Yu-Pack late count is structurally tiny (<1 percent of volume). Most of the count for cross-border-active merchants is EMS-international where customs adds days; the count is the customer-service workload behind the On-Time Delivery Rate percentage.
What it countsCOUNT(shipments WHERE delivered_at > expected_delivery_date) over 7 days. Consignments still in transit and exceeding aim are not counted here (they fall under Exception Rate).
API endpointPOST /api/v1/tracking/list reads the events stream; GET /api/v1/shipping/items provides the consignment metadata including expected_delivery_date.
Service-tier scopeYu-Pack, Yu-Pack Cool, EMS, Letter Pack Plus, Letter Pack Light.
Geographic OTD varianceDomestic late count concentrates in rural prefectures with Mon-Fri delivery (Akita, Yamagata, Iwate). International EMS late count concentrates by destination: UK heaviest post-Brexit, Russia and parts of Africa erratic.
Returns / RTOOutbound only.
Climate handlingTyphoon and snow events spike the count for affected weeks; not auto-excluded.
Peak-period seasonalityOseibo (mid-December) and Ochugen (mid-July) lift the count 1.5 to 2x; international EMS in those windows compresses faster than domestic.
Time window7D (rolling 7 days).
Alert trigger>5% of total weekly shipments. For a 4,500/week merchant alert fires at 225 late shipments. Domestic-only merchants rarely trip; cross-border merchants need destination-aware thresholds.
Rolesowner, operations

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Calculation

Calculated automatically from your Japan Post data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.

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Worked example

The Akihabara manga/anime collectibles retailer, 4,500 consignments per week. Reading at 09:00 JST on 12 Mar 26 for the trailing 7 days (06 Mar 26 to 12 Mar 26).
Service tierShipments (7D)LateLate %
Yu-Pack (domestic)2,925180.6%
EMS (international)1,12516814.9%
Letter Pack Plus45020.4%
All Japan Post tracked (this card)4,5001884.2%
The card reads 188 late shipments, alert at >5% not yet tripped. Three observations:
  1. EMS-international owns 89 percent of the late count. 168 of 188 late shipments are EMS, despite EMS being only 25 percent of volume. Of those 168, 78 are EMS-to-UK (Brexit customs lag), 32 are EMS-to-Russia (network unreliability), 28 are EMS-to-Italy/Spain (slower customs in Southern Europe), the rest spread across other destinations.
  2. Domestic late count of 18 is the structural minimum. 18 out of 2,925 Yu-Pack consignments is 0.6 percent, which is normal Japan Post performance. Most of these are Friday-shipped consignments to rural prefectures with Mon-Fri delivery, missing a Monday aim by one day.
  3. The customer-service load is concentrated. The merchant’s CS team will see most WISMO tickets come from UK and EU customers; the Japanese customers will not file tickets because the parcels arrive on time. Staff Japanese-English bilingual support for the 25 percent of volume that generates 89 percent of late-related contacts.

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Sibling cards merchants should reference together

CardWhy pair it with Late ShipmentsWhat the combination tells you
On-Time Delivery RatePercentage view of the same population.Percentage is customer-felt; count is operations workload.
Exception RateLeading indicator.Domestic exceptions are rare; spikes signal a real network event.
Shipments by DestinationGeographic concentration.Confirms whether the late count is domestic or international.
OTD by RoutePer-prefecture and per-country breakdown.Identifies which lanes drive the bulk of lates.
Avg Transit (days)Mean transit creep.Rising transit time predicts late count rising in 1 to 2 weeks.
Cross-connector: shopify.unfulfilled_ordersUpstream input.Backlog 2 to 4 days ago shows up as late shipments today.
Cross-connector: shopify.refund_rateDownstream consequence.Late spike at day 0 lifts refunds at day 7 to 14.

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Reconciling against the vendor’s own dashboard

Where to look in Japan Post’s own portal: Japan Post Business → Web Yu-Pri (My Page) → Reports → Shipment Status → Filter: delivered late. Yu-Biz contract customers find the same view in the Yu-Biz portal → Performance → Late Shipments. Why our number may legitimately differ from Japan Post’s report:
ReasonDirectionWhy
Timezone (JST)Boundary dayPortal in JST (UTC+9); card in UTC. Daily snapshots can shift by a day; weekly rolling averages out.
Customs lag for internationalOurs higherEMS consignments held at destination customs are counted late by the card; the portal sometimes pauses the SLA clock during customs.
Climate-driven exception spikesEitherTyphoon/snow-affected lanes excluded from official portal stats are still counted by the card.
Peak-period batch processingEitherMid-December and mid-July, the portal can take 3 to 7 days to reflect new lates; the card matches the API.
In-transit-but-already-lateOurs lowerThe card counts only delivered consignments past aim. The portal sometimes flags in-transit-past-aim as “late already”.
Cross-connector reconciliation:
CardExpected relationshipCauses of legitimate divergence
shopify.unfulfilled_ordersUpstream input.Webhook delays, B2B/pre-order flows.
shopify.refund_rateDownstream sentiment.Refunds have many drivers.

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Known limitations / merchant FAQs

My OTD shows 95.7 percent and the late count says 188 in 7 days. Which do I act on? Both, for different teams. The percentage tells the merchant whether the customer experience is acceptable; the count tells customer-service how many WISMO tickets are about to land. With 89 percent of the count being international EMS, your CS team needs bilingual capacity for UK/EU customers, not domestic Japan capacity. Domestic Yu-Pack rarely fires the alert. Should I lower the threshold? Yes, for domestic-only merchants. The default alert at 5 percent of total is calibrated for cross-border merchants; pure domestic Japanese merchants should set a count-based threshold (e.g. >50 late shipments per week) rather than a percentage threshold. Domestic Yu-Pack at 1+ percent late is unusual and worth investigation. Why is EMS-to-UK alone 8 percent of my late count? Brexit customs. Since Jan 2021 EMS to UK passes HMRC customs which adds 3 to 7 days plus a 1 to 3 percent stuck-at-customs rate. Japan Post’s published EMS aim to UK has not been updated to reflect the new normal, so the published aim is consistently missed. Two options: ship EMS Premium (Japan Post pays Royal Mail for last-mile guarantee) or change checkout copy to “8 to 14 day delivery to UK”. What about typhoons and snow? Typhoon season runs June through October; major typhoons cause 1 to 3 days of regional disruption, mostly in Kyushu, Shikoku, and the Pacific coast. Winter snow in Hokkaido and Tohoku causes 1 to 2 days of disruption typically. The card counts these as lates, you should annotate the alert as weather-driven and reset thresholds for the affected week. My MyPage portal shows 145 late, Vortex IQ shows 188. Why? Two reasons: (1) the portal sometimes excludes EMS consignments held at destination customs from the late tally (counts them as “in customs” instead); (2) JST/UTC boundary effects on weekly windows. The 43 unit gap is roughly the merchant’s count of EMS-customs cases. Should I worry about Friday-shipped Yu-Pack to rural prefectures? A bit. About 0.5 percent of domestic Yu-Pack volume is late by one day on Friday-shipped consignments to Mon-Fri-only delivery prefectures. The structural fix is to ship rural prefectures earlier in the week or pay for premium Sunday-delivery service. For most merchants the cost-vs-impact does not justify the change. Customs adds days to my international EMS. Are those counted as late? Yes, against Japan Post’s published aim. The aim is destination-country-specific. Customs hold time is included in the aim period. International is typically 60 to 80 percent of late count for cross-border-active merchants. My alert just fired during Oseibo peak. Is this normal? Yes. Mid-December peak typically lifts late count 1.5 to 2x. International compresses faster than domestic. The action: pre-warn customers in the BFCM/Oseibo order-confirmation email, lower customer-service response-time expectations for the 4 weeks of peak, and reset alert thresholds so you do not get re-alerted every reading.

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Tracked live in Vortex IQ Nerve Centre

Late Shipments is one of hundreds of KPI pulses Vortex IQ tracks across Japan Post and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. Start for free or book a demo to see this metric running on your own data.