Inventory planning as a 3PL service: how to offer it to client brands

A 3PL sees a client's inventory more clearly than almost anyone — including, often, the client. You know what's on the shelf, what shipped yesterday and what's due at the dock. Most 3PLs use that data only to run the warehouse. Turning it into planning help for clients is one of the clearest ways to stand out, and it pays you back operationally too.

This guide covers why it's worth doing, what to offer, the data you need, worked examples, and where the 3PL's role should stop.

Key takeaways

• Client stockouts cut the orders flowing through your warehouse. Client overbuying fills your racking and leads to awkward storage-fee conversations. Planning help addresses both.
• Offer it in tiers: visibility, then proactive alerts, then planning support with reorder suggestions and inbound schedules.
• You already hold stock and order data. You'll usually need the client's supplier lead times and open purchase orders to plan properly.
• Use client forecasts for your own capacity planning — space, labour and dock appointments — weeks before the stock arrives.
• Recommend; don't decide. The client owns buying decisions and the relationship with their suppliers.

Why planning is a 3PL's business

Three operational reasons, before any commercial ones:

1. Client stockouts are lost volume for you. If a client's best seller is out of stock for two weeks, those are pick-and-pack fees you didn't earn.
2. Surprise inbound jams the dock. When three clients' containers land in the same week without warning, receiving backs up and every client feels it.
3. Overstock turns into disputes. Storage fees on stock a client overbought are revenue on paper, but they're also the line on the invoice that prompts a client to review their 3PL.

A client who's warned before they run out, who knows when to book inbound, and who can see what's sitting idle is a client who stays.

What to offer: three tiers

Visibility is now table stakes; our guide to client inventory visibility covers the options. Alerts and planning support are where you differentiate. Some 3PLs include them for all clients, others charge for the planning tier, others use them to win and keep larger accounts. Choose the model that fits your pricing, but be clear what each tier includes.

The data you need

You already have on-hand stock, receipts and outbound orders. For planning you'll also want, per client:

• Sales history from their sales channels. Your outbound order history is a good proxy, but the client's Shopify store has the full picture, including orders not yet released to you.
• Supplier lead times. Ideally measured from purchase orders sent and received, not quoted.
• Open purchase orders. Quantities and expected dates, so incoming stock is counted.
• Case packs and minimum order quantities. So suggestions are orderable.
• Promotions and launches. A flash sale the warehouse hears about on the morning is a bad day for everyone.

Ask for these at onboarding, and make it easy for clients to keep them current — ideally by connecting their store and recording purchase orders in the same system.

Worked example: a proactive stockout warning

A client's best seller sells 50 units a day. It has 600 units available and nothing on order. The supplier's lead time is 20 days and the client wants 7 days of safety stock.

days of cover = 600 ÷ 50 = 12 days
reorder point = (20 + 7) × 50 = 1,350 units

The product is already well below its reorder point. Even if the client orders today, stock runs out in 12 days and the delivery arrives on day 20 — about 8 days out of stock, or roughly 8 × 50 = 400 units of missed sales. Raising this three weeks earlier would have avoided the gap entirely.

That's the kind of message that changes how a client sees their 3PL: "Your top product will run out in 12 days, and your supplier takes 20. Here are the numbers. Do you want to expedite?"

Worked example: capacity planning from client forecasts

The same planning data tells you what's coming at you.

A client currently holds 12,000 units at 480 units per pallet:

12,000 ÷ 480 = 25 pallets

Their peak-season purchase order is 8,000 units of a bulkier product at 400 units per pallet:

8,000 ÷ 400 = 20 pallets

If it lands before existing stock sells down, they'll briefly need 25 + 20 = 45 pallet positions — nearly double. Multiply that across your client list and you can see your peak space requirement weeks in advance, and talk to clients about staggering deliveries before the racking is full.

Labour works the same way. If a client's forecast is 300 units a day and their orders average 1.5 units each, that's 300 ÷ 1.5 = 200 orders a day. At an example pack rate of 40 orders an hour, that's 200 ÷ 40 = 5 packer-hours a day. If their promotion plan puts a peak day at four times normal, you need 20 packer-hours for that client alone. Use your own measured rates; the method is what matters.

An operating rhythm that scales

You can't hand-hold every client every day. A rhythm that scales:

• Daily: an internal view of stockout risk across all clients, so your account managers see trouble first.
• Weekly: an automated email to each client with their stockout risks, late inbound and order-by dates.
• Monthly: a short review with larger clients covering excess and aging stock (which drives their storage costs), supplier performance and the next month's inbound.
• Quarterly: a peak-season planning session for clients with seasonal businesses, agreeing inbound dates and receiving slots early.

Where the 3PL's role stops

Planning support works only if roles are clear:

• The client owns buying decisions. You recommend quantities and dates; they decide and place orders with their suppliers. Don't place purchase orders on a client's behalf unless that's an explicit, written part of your service.
• Show your method. Clients should be able to see why you're suggesting a quantity — velocity, lead time, safety stock, on order. Black-box numbers erode trust the first time one is wrong.
• Keep clients strictly separate. Each client must see only its own data, and planning reports must never mix clients. Ask hard questions of any software on this point.
• Be careful with conflicts. You earn storage fees on stock and handling fees on orders. Recommend what's right for the client's business; that's what keeps them with you.

Where Stokrio fits

Stokrio's 3PL client workspaces give each client its own organisation — its own users, stock, forecasts and purchase orders — with access resolved on the server for every request, while your staff move between clients from the organisation switcher. Each client can connect their Shopify store, so forecasts and reorder suggestions use their real sales, and inventory reports can be scheduled by email per client. More on the For 3PLs page.