3PL billing process: how warehouse billing works
How the 3PL billing process works: how warehouses record billable work in the WMS, billing cycles and invoice types, why errors happen and what data to ask for.
A 3PL bills you by recording each billable activity in its warehouse management system (WMS), applying the rate from your rate card, and adding up the results for each billing period. Most charges are captured automatically by scans and label purchases, while some, such as labor hours or special projects, are entered by hand. Errors usually come from those manual entries, rate tables that were not updated after a contract change, and quantities recorded in the wrong unit. The best protection is a line-item export for every invoice.
How a warehouse turns activity into an invoice
- Rates are set up. Your rate card is entered into the billing system: each fee, its unit, its rate and any minimum. Warehouse software vendor Extensiv describes this as storing each client's pricing, including discounts, tiers and special handling fees.
- Activity is recorded. As staff receive cartons, put stock away, pick and pack orders and process returns, the WMS logs each event with a time, client, SKU and quantity.
- Storage is measured. The system counts the pallets, bins or cubic feet you occupy, either on set dates or every day, depending on the contract.
- Shipping costs come in. The label cost for each parcel comes from the carrier rates the 3PL uses, and any agreed markup is applied.
- Manual charges are added. Labor hours, special projects, extra packaging and adjustments are keyed in by staff.
- Billing is run. At the end of the period, the system multiplies each activity by its rate and groups the lines into an invoice.
- The invoice is reviewed and sent, ideally with transaction-level backup, and your payment and dispute terms start.
What gets captured, and how
| Activity | Usually recorded by | Billed as |
|---|---|---|
| Receiving | Scans at the dock, or a count entered by staff | Per carton, pallet, unit or hour |
| Storage | Location snapshots or daily counts | Per pallet, bin, shelf or cubic foot per month |
| Pick and pack | Order and pick confirmations | Per order plus per additional item |
| Packaging | Box or mailer selected at the pack station, or a manual entry | Per box or mailer, or included |
| Shipping | Label purchase | Carrier cost, with or without markup |
| Returns | Return receipt scans | Per return, plus per item |
| Kitting and special projects | Time logs or work orders, often manual | Per hour, per kit or quoted |
| Account and other fees | Set up as recurring charges | Per month |
The more a line depends on manual entry, the more closely you should check it.
Billing cycles and invoice types
Billing schedules vary by contract. Extensiv notes that billing systems need to handle weekly, monthly and custom cycles, because 3PL clients ask for different schedules. Common patterns include:
- Monthly storage invoices. Storage is often billed once a month, sometimes in advance. The International Warehouse Logistics Association's (IWLA) standard terms, for example, make storage due on the first day of each storage month.
- Weekly or monthly fulfillment invoices. Pick and pack, packaging and shipping for the orders shipped in the period.
- Receiving charges. Billed on the next fulfillment invoice or as a separate invoice per inbound shipment.
- One-off invoices. Special projects, setup fees and carrier adjustments that arrive weeks after the original shipment.
Because one month's cost can be spread across several invoices, reconcile by month, not by invoice. Our 3PL invoice example shows how a typical invoice is laid out.
Why billing errors happen
Extensiv lists the common warehouse billing mistakes as missed billable activity, incorrect rates from outdated pricing tables, billing for services not performed, missed accessorial charges, late invoices and too little detail for clients to check. From the brand's side, the errors that cost money tend to look like this:
- Manual entries. A receiving charge keyed twice, or labor hours rounded up.
- Rate tables not updated after an amendment. The new rate is agreed in an email but the old one stays in the system. In our made-up sample audit, the warehouse kept billing additional items at $0.85 after the rate dropped to $0.65 on July 1.
- Mis-keyed units. Cartons entered as units, 10 entered as 100, or a quantity times rate that does not add up.
- Storage measured the wrong way. A peak or snapshot count used when the contract says monthly average.
- Orders that should not be billed. Canceled orders or orders that never shipped still carrying pick and pack fees.
- Markup applied to the wrong base. A higher percentage than agreed, or markup added to carrier adjustments the contract excludes.
Our guide to 3PL billing errors covers each one with examples.
| Charge | Order | Qty | Rate | Amount |
|---|---|---|---|---|
| Pick and pack, first item | #10482 | 1 | 3.25 | 3.25 |
| Additional item | #10482 | 3 | 0.85 | 2.55 |
| Order #10482 had 2 items, and your rate card says $0.65 each. Should be $1.30. Over by $1.25 | ||||
| Pick and pack, first item | #10477 | 1 | 3.25 | 3.25 |
| Order #10477 was cancelled on Sep 3, before it shipped. Over by $3.25 | ||||
| Pallet storage | 46 | 18.00 | 828.00 | |
| Your contract bills the month's average, which was 38 pallets. Over by $144.00 | ||||
What to ask your 3PL for
A summary invoice cannot be checked. Ask for a line-item export with every invoice, ideally as a CSV file, with these fields:
- Invoice number and billing period
- Charge type, matching the fee names on your rate card
- Date of the activity
- Order number, matching your Shopify order number
- SKU and quantity
- Unit of measure
- Rate applied and extended amount (quantity times rate)
- For shipping: tracking number, carrier, service, billed weight, carrier cost and markup
- For storage: the count behind the charge and the dates it was measured
- For manual charges: who entered it and a short reason
Also ask for the rate card version the system used for the period. Extensiv notes that WMS platforms can keep a history of rate card versions, which helps when you dispute a charge. If the 3PL's client portal lets you download this yourself, check the export matches the invoice total before you rely on it. Our 3PL invoice audit checklist lists what to check once you have the file.
3PL billing software
On the warehouse side, billing is usually a module of the WMS or a tool connected to it. Vendors such as Extensiv describe billing built into the WMS that captures activity and applies each client's rates automatically. Automation removes some keying errors, but it applies whatever rates were entered, so an out-of-date rate table produces wrong invoices just as reliably.
On the brand side, most teams check invoices in a spreadsheet: match each line to the rate card, match order lines to Shopify, and recalculate quantity times rate. Our guide on how to audit a 3PL invoice sets out the steps.
Have your invoices checked
3PL Checker does that check for you. The free audit compares every line of your 3PL invoices with your signed rate card and your Shopify orders, a person reviews each finding, and you get the evidence and a ready-to-send credit request.
Questions
What is 3PL billing?
It is how a third-party warehouse turns the work it does for you (receiving, storage, picking, packing, shipping and extra services) into invoices, by applying the rates in your rate card to the activity recorded in its systems.
What is the warehouse billing process?
The 3PL loads your rate card into its billing system, records each billable activity as it happens, measures storage, adds manual charges, runs billing for the period, reviews the invoice and sends it with supporting detail.
What is 3PL billing software?
Software, often a module of the warehouse management system (WMS), that stores each client's rates, applies them to recorded activity and produces invoices. Brands use spreadsheets or audit services on the other side to check those invoices.
What is a 3PL invoice?
A bill from your warehouse listing charges for a period, usually grouped by storage, receiving, fulfillment, packaging, shipping and other services. A useful invoice can be traced back to line-item detail for every charge.