An order can leave the warehouse correctly while the work behind it is billed incorrectly. Extra labeling may never reach the billing record, a revised client rate may not be applied, or storage charges may use an incomplete inventory snapshot.
For a 3PL, these gaps are easy to miss when warehouse activity, pricing agreements, and invoice preparation are checked separately. A WMS can provide supporting records, but the billing process still needs a way to identify missing or inconsistent charges.
This guide covers five checks to perform before client invoices are issued, including the records to compare and the discrepancies worth investigating.
What Is Revenue Leakage in a 3PL?
Revenue leakage occurs when services that should be billed under a client's agreement are omitted or undercharged. Examples include unbilled handling activities, an outdated rate, or a missed recurring charge.
This differs from higher operating costs. Extra picking time or rework can reduce margin even when the invoice is correct. Keeping these problems separate helps teams decide whether to investigate billing records, warehouse processes, or both.
A WMS-related billing gap may originate in activity capture, configuration, integrations, or manual review. Trace the discrepancy before deciding which system or procedure needs to change.
Five Checks for 3PL Revenue Leakage
1. Completed Activities Missing From Billing Records
Compare completed warehouse activities with the records used to calculate client charges. Include services that happen outside routine picking and packing, such as relabeling, kitting, repackaging, and returns inspection.
For each sampled activity, check the client, service type, quantity, completion date, and transaction reference. If no charge appears, establish whether the service is included in another fee, intentionally waived, or genuinely missing. The aim is accurate billing, not charging twice for the same work.
2. Rates That Do Not Match the Client Agreement
Select a sample of charges and compare the applied rate with the relevant rate card and effective date. Check the billing unit as well: a charge per carton should not be calculated using an item quantity.
Pay particular attention after a pricing change or a new service is introduced. Record which transactions are affected, then correct the configuration and review the resulting charges before approval.
3. Storage Charges Using the Wrong Basis
Identify how storage is calculated for each client. The agreement may use pallet positions, bins, volume, daily balances, or another defined measure.
Compare the source records and calculation period with that agreed basis. Investigate missing dates, incorrect units, and stock assigned to the wrong client or status. Do not assume every stored item attracts the same charge; exclusions and handling rules need to follow the client's agreement.
4. Recurring Fees or Minimums Applied Incorrectly
Review recurring services and minimum charges separately from transaction-based fees. Check whether each applicable charge appears in the correct billing period and whether any agreed waiver has been recorded.
Where a minimum applies, confirm which charges count toward it. Adding a full minimum on top of charges that should already count toward that minimum can overbill the client, while omitting the required difference can underbill them.
5. Adjustments Without a Clear Reason or Supporting Record
Review manually changed charges, discounts, credits, and waived services before invoice approval. Each change should identify the affected transaction, the reason, and the person who approved it.
Look for repeated adjustments to the same service or client. They may point to an incorrect rate, incomplete activity capture, or an unclear billing rule. Correcting the underlying cause reduces repeated work in later billing periods.
Example: Finding an Unbilled Labeling Activity
Suppose a client agreement includes a separate labeling service at $0.20 per unit. Warehouse records show 600 completed units during the billing period, but the billing record includes only 450.
The 150-unit difference represents a potential $30 undercharge. These figures are hypothetical and are not Fulfillor prices or industry benchmarks.
Before changing the invoice, check whether the remaining units were billed elsewhere, included in another service, waived, or recorded against a different period. If the difference is confirmed, correct the charge and investigate why those activities were omitted.
Keep the transaction references with the correction so another reviewer can follow the calculation.
How to Review Billing Discrepancies Before Approval
Start with a defined client and billing period. Bring together the applicable pricing agreement, completed activity records, storage calculations, and proposed invoice lines.
Record each discrepancy with its supporting reference, expected treatment, assigned reviewer, and resolution. Separate confirmed errors from items that still need clarification, and check both undercharges and overcharges.
For the wider process of connecting activity capture with pricing and invoice preparation, read our guide to automating 3PL client billing.
Make Each Charge Traceable
A useful billing review connects the agreed service, the completed work, and the calculated charge. When those records disagree, investigate the cause and record the resolution before approval.
Explore Fulfillor's 3PL billing software, or schedule a demo to review your activity capture, rate calculations, and invoice preparation requirements.