Pass-through cost

Pass-through cost is a third-party charge a vendor bills to you at cost or at a stated markup. Learn how unverified pass-through terms create margin drift.

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Pass-through cost

Pass-through cost is a charge a vendor incurs from a third party, such as a carrier fuel surcharge, a subcontractor fee, or a licensing fee, and bills to you under a contract clause that names what qualifies and what markup, if any, applies. The term matters because a pass-through clause creates a specific verification obligation: the vendor is claiming to relay someone else's charge, not setting its own price.

That distinction is where margin drift is the gap between what a vendor contract says and what the invoice actually charges. Every pass-through line item is a small claim about a third party's invoice, and a pass-through clause shifts the verification burden onto the buyer rather than the vendor. AP review typically compares the invoice to the purchase order and the contract's rate card, and neither document carries the third-party source for a pass-through item, so a charge can be marked up, duplicated, or invented entirely and still clear a standard match.

What changes this is treating pass-through terms as their own contract clause with its own audit trail: requesting backup documentation on pass-through line items and confirming any markup matches what the contract states.

1. What is a pass-through cost?

A pass-through cost is a charge a vendor incurs from a third party, such as a carrier, subcontractor, or utility, and bills to you at cost or at cost plus a markup the contract specifies. The vendor did not set the price; it is relaying someone else's charge under a right the contract grants it. The clause should name which charges qualify, the markup allowed, and the documentation the vendor must provide to support the amount billed.

The contrast that matters is with a fee the vendor prices itself under its own rate card. A pass-through item's price originates outside the vendor relationship entirely, in a third party's own invoice or tariff.

2. How is a pass-through cost different from a surcharge?

A surcharge is a fee the vendor sets under its own published rate schedule, applied uniformly to qualifying invoices. A pass-through cost originates outside the vendor, from a carrier's fuel index, a subcontractor's invoice, or a utility bill, and the vendor's only contractual right is to recover it, not to price it. Confusing the two matters because the audit method differs: a surcharge is checked against the vendor's own schedule, a pass-through cost against a third-party source document.

Freight invoices often blend both types on one line, which is why the source distinction has to be checked rather than assumed. Accessorial charge creep is a related but separate failure mode worth reading on its own terms.

3. How do you verify a pass-through charge is legitimate?

Request the underlying document the charge is based on: the carrier's fuel surcharge table, the subcontractor's invoice, or the published tariff. The contract clause should state the source and any permitted markup. A pass-through line item with no attached or referenceable source document is an unverified claim, not a confirmed charge, regardless of how routine it looks on the invoice.

Where a markup is allowed, confirm it applies to the correct base amount and is not compounded on an already-marked-up figure.

Without the source document, an at-cost claim and an invented one look identical on the invoice face.

4. Where do pass-through costs create the most audit risk?

Pass-through terms create risk wherever a vendor routinely relies on a third party: freight invoices carry fuel and accessorial pass-throughs, contract labor invoices carry payroll tax and benefits pass-throughs, and IT and professional services invoices carry licensing and travel pass-throughs. Each category needs its own source document check, because the third party and the applicable rate differ by category.

A standard three-way match checks the invoice against the purchase order and receipt. It does not test whether a pass-through line item's source document supports the amount billed, because that document sits outside the ERP entirely.

  • Freight and labor: Freight pass-throughs trace to carrier fuel indices and accessorial tariffs. Contract labor pass-throughs trace to payroll tax rates and benefits schedules set by the staffing vendor's own cost structure.
  • Services and utilities: Professional services pass-throughs commonly cover third-party software licenses and travel. Utilities and energy contracts pass through regulatory and transmission charges set by a separate provider.
  • Freight and 3PL: This category concentrates fuel and accessorial pass-throughs on nearly every invoice, making source documentation the single highest-value check available.

For the wider pattern this sits inside, start with the margin drift guide.

5. Frequently Asked Questions (People Also Ask)

What is a pass-through cost in a vendor contract?

A pass-through cost is a charge the vendor incurs from a third party, such as a carrier fuel surcharge or a subcontractor fee, and bills to you at cost or at cost plus a stated markup. The contract names which charges qualify and what markup, if any, applies.

Is a pass-through cost the same as a surcharge?

No. A surcharge is a fee the vendor sets itself, under its own rate schedule. A pass-through cost originates outside the vendor, from a carrier, subcontractor, or utility, and the vendor's contract right is only to recover it, not to price it.

How do you verify a pass-through charge is legitimate?

Ask for the underlying third-party invoice or published tariff the charge is based on. The contract clause should state the source and the markup, if any. Without that backup document, the line item is a claim, not a verified charge.

Can a vendor mark up a pass-through cost?

Only if the contract says so. Some agreements allow a stated handling fee or percentage markup on pass-through items; many allow none. The clause language controls, not the vendor's invoice format.

Where do pass-through costs most often appear?

Freight and 3PL invoices carry fuel and accessorial pass-throughs. Contract labor invoices carry payroll tax and benefits pass-throughs. IT and professional services invoices carry licensing and travel pass-throughs.

What happens if a pass-through clause does not name a markup?

Silence is usually read as at-cost, meaning no markup is permitted. An invoice that adds a percentage on top of a pass-through item with no stated markup clause is charging outside the contract's terms.

Does three-way matching catch a mispriced pass-through charge?

Three-way matching checks the invoice against the purchase order and receipt. It does not test whether a pass-through line item's amount matches the third-party source document, because that document sits outside the ERP.

Is a pass-through cost the same issue as a missed credit memo?

No. A missed credit memo involves a refund or adjustment the vendor owed and never issued. A pass-through cost issue involves the original charge being unverified or marked up beyond what the contract allows.

1. What is a pass-through cost?

A pass-through cost is a charge a vendor incurs from a third party, such as a carrier, subcontractor, or utility, and bills to you at cost or at cost plus a markup the contract specifies. The vendor did not set the price; it is relaying someone else's charge under a right the contract grants it. The clause should name which charges qualify, the markup allowed, and the documentation the vendor must provide to support the amount billed. The contrast that matters is with a fee the vendor prices itself under its own rate card. A pass-through item's price originates outside the vendor relationship entirely, in a third party's own invoice or tariff.

2. How is a pass-through cost different from a surcharge?

A surcharge is a fee the vendor sets under its own published rate schedule, applied uniformly to qualifying invoices. A pass-through cost originates outside the vendor, from a carrier's fuel index, a subcontractor's invoice, or a utility bill, and the vendor's only contractual right is to recover it, not to price it. Confusing the two matters because the audit method differs: a surcharge is checked against the vendor's own schedule, a pass-through cost against a third-party source document. Freight invoices often blend both types on one line, which is why the source distinction has to be checked rather than assumed. [Accessorial charge creep](/glossary/accessorial-charge-creep) is a related but separate failure mode worth reading on its own terms.

3. How do you verify a pass-through charge is legitimate?

Request the underlying document the charge is based on: the carrier's fuel surcharge table, the subcontractor's invoice, or the published tariff. The contract clause should state the source and any permitted markup. A pass-through line item with no attached or referenceable source document is an unverified claim, not a confirmed charge, regardless of how routine it looks on the invoice. Where a markup is allowed, confirm it applies to the correct base amount and is not compounded on an already-marked-up figure. Without the source document, an at-cost claim and an invented one look identical on the invoice face.

4. Where do pass-through costs create the most audit risk?

Pass-through terms create risk wherever a vendor routinely relies on a third party: freight invoices carry fuel and accessorial pass-throughs, contract labor invoices carry payroll tax and benefits pass-throughs, and IT and professional services invoices carry licensing and travel pass-throughs. Each category needs its own source document check, because the third party and the applicable rate differ by category. A standard three-way match checks the invoice against the purchase order and receipt. It does not test whether a pass-through line item's source document supports the amount billed, because that document sits outside the ERP entirely. - Freight and labor: Freight pass-throughs trace to carrier fuel indices and accessorial tariffs. Contract labor pass-throughs trace to payroll tax rates and benefits schedules set by the staffing vendor's own cost structure. - Services and utilities: Professional services pass-throughs commonly cover third-party software licenses and travel. Utilities and energy contracts pass through regulatory and transmission charges set by a separate provider. - [Freight and 3PL](/glossary/freight-and-3pl-audit): This category concentrates fuel and accessorial pass-throughs on nearly every invoice, making source documentation the single highest-value check available. For the wider pattern this sits inside, start with the [margin drift](/insights/margin-drift-spend-leakage-guide) guide.

Questions & Answers

What is a pass-through cost in a vendor contract?

A pass-through cost is a charge the vendor incurs from a third party, such as a carrier fuel surcharge or a subcontractor fee, and bills to you at cost or at cost plus a stated markup. The contract names which charges qualify and what markup, if any, applies.

Is a pass-through cost the same as a surcharge?

No. A surcharge is a fee the vendor sets itself, under its own rate schedule. A pass-through cost originates outside the vendor, from a carrier, subcontractor, or utility, and the vendor's contract right is only to recover it, not to price it.

How do you verify a pass-through charge is legitimate?

Ask for the underlying third-party invoice or published tariff the charge is based on. The contract clause should state the source and the markup, if any. Without that backup document, the line item is a claim, not a verified charge.

Can a vendor mark up a pass-through cost?

Only if the contract says so. Some agreements allow a stated handling fee or percentage markup on pass-through items; many allow none. The clause language controls, not the vendor's invoice format.

Where do pass-through costs most often appear?

Freight and 3PL invoices carry fuel and accessorial pass-throughs. Contract labor invoices carry payroll tax and benefits pass-throughs. IT and professional services invoices carry licensing and travel pass-throughs.

Margin Drift Resources