South African online retail passed R130 billion in 2025, close to 10% of all retail, and is growing at roughly 25 to 38% a year. The demand that creates no longer arrives as a single Black Friday spike. It builds from October, peaks over the Black Friday to Cyber Monday window, and holds through Christmas, back-to-school and the January returns wave. That five-month stretch is what the trade now calls Q5.

Most distribution centres plan for the front of it. Slotting, labour and dispatch get sized for the November surge. The back half, December through February, gets treated as wind-down. That is where cost per order quietly climbs.

Why the tail is the expensive part

Three things land after the November peak, and they hit a building that has already spent its energy.

Returns arrive in volume from mid-December. Fashion returns run 18 to 22% of units sold, electronics 10 to 14%, health and beauty 8 to 12%. Every returned unit needs receiving, inspection, grading and put-away or disposal before it earns anything back. During peak, returns can occupy up to 20% of warehouse capacity. The stock sits in the outbound area because no one planned a lane for it.

Labour thins out at the same time. Permanent staff take December leave. The temps hired for November are now three weeks in and starting to turn over. January opens with a green crew processing the hardest work in the calendar.

January restock collides with returns processing. New-season stock arrives while the building is still clearing December's returns. Inbound and reverse flows compete for the same doors, the same staff and the same floor.

What to plan for the full window, not just the spike

The changes that hold up across five months are the ones that alter how existing people and systems execute, not new kit. Robotics and racking will not clear capex and lead times before the season starts.

Give returns a dedicated lane and own it from day one. Plan the space, the staff and the grading rules before December, not in week two when returns are already piling into outbound. A returned unit graded and put away in 24 hours is stock you can resell in January. One that sits for a week is a write-down.

Plan labour to February, not to Christmas. The staffing plan that ends on 24 December leaves January exposed. Map the temp roster and the training against the returns and restock curve, so the crew that handles January is not learning the building that week.

Re-slot once for the peak profile, then again for January. The November promotional profile and the January new-season profile are different. A single re-slot in September covers the front. The building that also plans a light January re-slot holds pick productivity into the new year.

Use your existing WMS data to see the tail before it arrives. Last year's December and January order and returns lines already show where the building slows down. A software layer on top of your existing WMS can model the returns and restock load and set the slotting and labour plan against it, without touching the core system.

A workable timeline

September: model the full Q5 curve from last year's data, including December returns and January restock. Set the peak and January slotting plans.

October: run the method at normal volume, train supervisors and temps, hold the layout stable.

November to December: execute. Stand up the returns lane before the first wave, not after.

January to February: process returns against a planned lane and a rostered crew, run the light re-slot, hold cost per order.

Where OptiChain sits

The operations that hold their cost per order through February are the ones that planned for five months, not one week. Returns and January restock are predictable from your own history, and predictable load is load you can plan against.

OptiChain Solutions works with South African retailers, distributors and 3PLs on peak readiness across the full Q5 window: modelling the returns and restock curve, sizing the reverse-logistics and slotting opportunity, and building the labour plan against real demand. If you want to know where your building loses margin in January, last year's data will show you now, while there is still time to plan for it.

Sources