How do I plan for Amazon supplier lead-time variability?
Measure the last 6 to 10 POs and compute the standard deviation of total lead time. Add that variability into your safety stock. Track supplier lead-time performance monthly. Any supplier missing lead time by more than 15% consistently should either be replaced or padded aggressively in planning.
Where lead time actually varies
Production is usually the biggest variable, especially around Chinese New Year and Golden Week. Transit is more predictable but customs delays cluster. FBA check-in varies most during Q4.
How to plan for it
Split total lead time into production, transit, and check-in. Track variance on each independently. Pad safety stock using the sqrt(lead time) formula on the combined standard deviation.
Frequently asked questions
Should I switch suppliers for lead-time misses?
Only if the miss is chronic. One late PO in a year is normal; three in a year is a red flag.
Do I need a backup supplier?
Yes for hero SKUs. Even a small ongoing PO with a second factory preserves the option.
Is DDP shipping faster or just simpler?
Simpler, and often faster because customs is handled by the freight forwarder as part of the door-to-door service.
See this in Nova
Nova surfaces this metric per SKU in near real time so you can act before your next monthly close catches it.
Try Nova free for 14 daysRelated questions
What is the reorder point formula for Amazon FBA?
Reorder point = (average daily sales x lead time in days) + safety stock. Lead time includes production plus transit plus FBA check-in. Safety stock covers demand and lead-time variability. If any of those numbers is wrong, you either stock out or bury cash in overstock.
How do I calculate safety stock for Amazon FBA?
Safety stock = Z-score x demand standard deviation x sqrt(lead time in days). For a 95% service level, Z is about 1.65. Use daily sales variability over the last 90 days. Fewer than 30 days of history means guess higher because variability is under-measured.
How do I negotiate MOQ with Amazon suppliers?
The three levers that actually move MOQ are volume commitment, deposit percentage, and packaging simplification. Committing to 12-month volume in exchange for staggered releases usually cuts MOQ by 30% to 50%. Larger deposits and standard packaging both reduce supplier risk and unlock lower minimums.
How do I plan Amazon FBA inventory for Q4?
Place your Q4 hero SKU POs by early July, second wave by late August, and a small third wave for post-Cyber Monday replenishment by mid-October. Amazon FC intake slows in November and early December, so units that miss check-in windows sit outside FBA during the peak.
AWD vs FBA: when should I use each?
AWD (Amazon Warehousing & Distribution) is upstream bulk storage that transfers to FBA on demand. Use FBA for the 4 to 8 weeks of forward cover you actually need. Use AWD for the bulk pallet buffer behind it. AWD storage is meaningfully cheaper per cubic foot than FBA.