Vendor Managed Inventory vs Consignment: A Guide

Vendor managed inventory and consignment both move stock closer to the customer while changing who decides what gets replenished and who owns it in the meantime. They are frequently confused, occasionally combined, and often proposed by a large buyer who has already decided you are going to do it.

Here is what each model actually is, what it does to your working capital, and what your warehouse has to be able to do to support it.

Vendor managed inventory (VMI)

Under VMI, the supplier takes responsibility for deciding when and how much to ship to the customer. The customer shares demand and inventory data — often a daily or weekly inventory advice, sometimes point-of-sale data — and the supplier replenishes against agreed minimum and maximum levels.

Ownership normally transfers at delivery, exactly as it would in a conventional purchase order relationship. What changes is who plans.

Why customers like it: fewer stockouts, less planning labor, smoother inbound flow.
Why suppliers accept it: visibility into real demand instead of guessing from lumpy purchase orders, more stable production planning, and a stickier customer relationship.
The risk: you are now accountable for their stockouts. If your replenishment model is wrong, it is your problem, and the service-level penalty is usually written into the agreement.

Consignment

Under consignment, the goods sit at the customer’s location — or at a warehouse near them — but you still own them. Title transfers only when the customer consumes or sells the unit. You invoice against usage, not against delivery.

Why customers love it: product on hand with no cash tied up and no obsolescence risk.
Why suppliers accept it: it wins accounts, gets shelf presence, and shortens the customer’s lead time to effectively zero.
The risk: your working capital funds their inventory. Cash conversion stretches, and you carry shrinkage and obsolescence exposure on stock you cannot see.

The combination

The two are often stacked: consigned stock that the supplier also manages and replenishes. That is the most demanding version, and the one where inventory accuracy stops being a nicety.

The working capital math

Before agreeing to either model, calculate the change in days inventory outstanding. If you currently ship on order and get paid net 30, and you move to consignment with an average of six weeks of stock sitting at the customer before consumption, you have added roughly 42 days to your cash cycle before the invoice clock even starts.

That is a real cost, and it should be priced. Suppliers who agree to consignment without adjusting terms or price often discover that a growing account is consuming cash faster than it generates margin. If the customer will not move on price, negotiate on the other levers: maximum consigned quantity, aging clauses that convert unsold stock to a sale after a defined period, and clear responsibility for shrinkage and damage.

What your warehouse has to do

Both models depend on inventory records that are right, not approximately right. Specifically:

Ownership-aware inventory

The system must be able to hold stock that is physically present but not yet sold, segregated by owner, and report on it separately. Blending consigned and owned stock in one bucket makes month-end reconciliation impossible.

Real-time visibility for both parties

VMI is only as good as the data feeding it. You need current on-hand and consumption figures, ideally through an automated feed rather than a spreadsheet emailed on Fridays. Our overview of EDI and API integration covers the connection options; an EDI 852 product activity or 846 inventory advice is the classic mechanism.

Accurate cycle counting

When you own stock you cannot personally see, count discipline is your only protection. Regular cycle counts with reconciliation and root-cause follow-up beat an annual physical inventory that reveals a large variance far too late. See our comparison of cycle counting vs. physical inventory.

Aging and obsolescence reporting

Consigned stock that has not moved in six months is a warning sign. You need aging reports by SKU and location so you can act while the product still has value.

Fast, reliable replenishment execution

A VMI model that is correct on paper still fails if the shipment takes five days to leave. Position inventory close to the customer, keep the pick and pack cycle short, and make sure someone is accountable for the replenishment order actually shipping. Our pick and pack process is built around short cycle times.

A middle path: forward stocking without consignment

If a customer wants near-instant availability but you are not willing to fund their inventory, consider holding stock at a third-party warehouse near them and shipping on receipt of order. You keep title and control, they get a one-day lead time, and nobody’s balance sheet gets distorted. For customers across Florida, the Caribbean and Latin America, a Miami position often covers a very large service area from one location — see our note on Miami as a distribution gateway.

Contract points worth pinning down

• Who bears risk of loss and damage while the stock is consigned, and who insures it
• Minimum and maximum stock levels, and who can change them
• How consumption is reported, how often, and what happens if reporting stops
• Aging clause: at what point does unsold stock convert to a sale or return
• Return freight responsibility at termination
• Audit rights — can you count your own stock at their site, and with how much notice

Thinking about a forward-stocking or consignment program out of South Florida? Talk to our team about how the inventory would be tracked and reported.

Frequently asked questions

What is the difference between VMI and consignment?

VMI is about who plans replenishment; consignment is about who owns the stock. Under VMI the supplier decides what to ship and title usually transfers on delivery. Under consignment the supplier retains title until the customer uses or sells the product. The two are often combined but are independent decisions.

Who is responsible if consigned inventory is damaged or stolen?

It depends entirely on the agreement, which is why it needs to be explicit. Because the supplier still owns the goods, risk of loss often stays with the supplier by default unless the contract shifts it. Confirm insurance coverage on both sides before stock ships.

Can a 3PL support consignment inventory?

Yes, provided their system can track ownership separately from physical location and report on-hand and consumption by owner. Ask to see a sample report before committing, because this is a genuine capability difference between providers rather than a universal feature.