Restock Limits
Per-month caps on how many units you can SEND to FBA, separate from how much you can STORE there.
Restock Limits are the per-month cap on how many units you can SEND to Amazon's FBA network, distinct from Capacity Limits (which cap how much you can store there). A seller can have plenty of remaining capacity but be unable to inbound new shipments because their restock limit is full for the month.
Restock limits are set by storage type (standard, oversized, etc.) and reset monthly. They're influenced by the same factors as capacity limits — IPI score, sales velocity, and Amazon's overall capacity — but the math is different. A common gotcha: you have 5,000 cubic feet of remaining capacity but only 200 units of remaining standard restock for the month. You can't actually use that capacity.
SellerVault's restock planner surfaces remaining restock limit and remaining capacity side by side, and warns when a recommendation would exceed either constraint. Most spreadsheet workflows ignore restock limits entirely and only discover them when an inbound shipment gets rejected at creation.