Freight payment works as a documented sequence: the carrier delivers the load, the consignee signs for it, the carrier bills within federal deadlines, the shipper audits the invoice against the rate agreement, and funds move once discrepancies are resolved. Federal regulations set the outer limits at each step, including a seven-business-day window for the carrier to present its bill, a credit period capped at 30 calendar days, and a 180-day cutoff for either side to dispute the charges. Miss those deadlines and you lose leverage, money, or both.
The Documents That Start the Clock
Two documents drive almost every freight payment. The bill of lading is issued at origin and functions as both a receipt and a contract of carriage; federal law under 49 U.S. Code Chapter 801 governs these documents for interstate and international shipments.1Office of the Law Revision Counsel. 49 USC Chapter 801 – Bills of Lading The proof of delivery is signed by the consignee at destination and confirms receipt of the goods.
The signed POD is what triggers the payment cycle. Without it, carriers face delays or outright denial. Before payment moves, the two documents get cross-referenced. If the bill of lading shows 40 pallets and the POD notes 38 with two damaged, that gap has to be reconciled before the invoice clears.
What Belongs on the Invoice
A freight invoice missing key data will stall in accounts payable. Every invoice needs the Standard Carrier Alpha Code, the two-to-four-letter identifier assigned to the transportation company.2U.S. Customs and Border Protection. What is Standard Carrier Alpha Code? It also needs origin and destination zip codes so the payor can verify mileage, and the contract or rate agreement number that ties the invoice to the pricing the parties negotiated.
For less-than-truckload shipments, the National Motor Freight Classification code has to match the actual commodity.3NMFTA. NMFC A mismatch means the carrier either overbills or underbills, and both create problems later.
Accessorial Charges
Beyond the base rate, most invoices carry accessorial charges for services outside standard pickup and delivery. Common ones include detention when a truck waits past its free time, liftgate fees, residential delivery surcharges, lumper fees for third-party warehouse labor, and fuel surcharges tied to diesel prices. Every accessorial should trace back to the rate agreement or a published tariff, with clearly defined free-time allowances and minimum charges. If the contract doesn’t authorize a charge, flag it during the audit. Accessorials are among the most common sources of billing disputes, and shippers lose money when they don’t read the fine print.
Federal Billing and Credit Deadlines
Under 49 CFR 377.205, a carrier must present its freight bill within seven business days. For prepaid shipments, the clock starts at pickup. For collect shipments, it starts at delivery. Every bill must state the credit time limit, any service charges for late payment, and any discount terms.4eCFR. 49 CFR 377.205 – Presentation of Freight Bills
Once the bill is presented, the default credit period is 15 calendar days, weekends and holidays included. Carriers can publish a different period in their tariffs, but federal rules cap it at 30 calendar days.5eCFR. 49 CFR 377.203 – Extension of Credit to Shippers Missing that window can trigger the late-payment penalties spelled out in the carrier’s tariff.
The 180-Day Window to Contest Charges
Both sides face a hard 180-day deadline for billing disputes. A carrier that wants to collect additional charges beyond the original invoice must issue a supplemental bill within 180 days of the original. A shipper that wants to contest an original or supplemental bill must do so within 180 days of receiving it. Miss that window and the right to dispute the amount is gone.6Office of the Law Revision Counsel. 49 USC 13710 – Additional Billing and Collecting Practices This deadline is one of the most overlooked in freight payment.
The Audit Before Payment
The audit is where the invoice, the bill of lading, and the rate agreement get compared side by side. Auditors verify that the invoiced weight matches what was documented at pickup, that the freight class matches the actual commodity, and that every accessorial was authorized under the contract. If the invoiced rate exceeds the contracted rate, it gets adjusted before funds release.
Duplicate billing is another frequent catch. A carrier might submit the same shipment twice, or a corrected invoice might come through without the original being canceled. Audits also flag math errors, incorrect fuel surcharge calculations, and mileage discrepancies between the zip codes on the bill and the rate used for pricing.
When a discrepancy surfaces, the auditor issues a short-pay notice or declination explaining the correction. Some companies run audits in-house; many outsource to third-party freight payment providers that process high volumes and spot patterns a small accounting team would miss.
How the Money Moves
Once the audit clears, funds move through one of several channels. Automated Clearing House transfers dominate high-volume operations because they’re fast and inexpensive; the median cost of an ACH payment runs between $0.26 and $0.50 per transaction for most businesses.7Nacha. ACH Costs are a Fraction of Check Costs for Businesses, AFP Survey Shows Paper checks still circulate with smaller carriers but introduce days of float. International shipments often move by wire through the SWIFT network. Larger shippers use third-party payment portals to approve disbursements in bulk instead of cutting individual payments.
When Carriers Factor Their Invoices
Carriers that can’t wait 15 to 30 days for payment often sell their invoices to a factoring company, which advances most of the value immediately and collects from the shipper or broker later. Factoring fees generally run between 1% and 5% of invoice value. Established fleets with high volume and creditworthy customers pay closer to 1% to 3%; new-authority carriers or those hauling for slow-paying brokers pay 3% to 5% or more. A lower headline rate isn’t always cheaper, because some agreements add reserve holdbacks, ACH fees, and minimum volume charges.
When a Broker Sits in the Middle
When a freight broker arranges transportation, the broker typically pays the carrier. If the broker defaults or goes insolvent, the carrier isn’t necessarily left holding the loss. Federal law requires every registered freight broker to maintain financial security of at least $75,000, regardless of how many offices or agents the broker operates.8Office of the Law Revision Counsel. 49 USC 13906 – Security of Motor Carriers, Motor Private Carriers, Brokers, and Freight Forwarders Brokers satisfy this by filing a BMC-84 surety bond or a BMC-85 trust fund with FMCSA.9eCFR. 49 CFR 387.307 – Property Broker Surety Bond or Trust Fund
In practice, that bond often gets divided among multiple claimants, so carriers rarely recover the full amount owed. Courts have also held shippers liable for carrier payment when the broker defaults, particularly under theories of unjust enrichment: if the shipper received the freight and the carrier never got paid, a court may decide it’s unfair for the shipper to keep the benefit for free. Shippers who skip basic broker vetting carry the most exposure.
Deadlines for Lawsuits and Cargo Claims
The 180-day contest deadline covers billing disputes with the carrier. Filing a civil action is a separate clock. Both carriers and shippers have 18 months from the date the claim accrues to sue on an overcharge or undercharge. For property shipments, that clock starts on the date of delivery or tender of delivery. A shipper that files an overcharge complaint with the Surface Transportation Board instead of going straight to court gets three years.10Office of the Law Revision Counsel. 49 USC 14705 – Limitation on Actions by and Against Carriers
Cargo loss and damage claims follow a separate track under the Carmack Amendment. A carrier cannot set a filing deadline shorter than nine months for the initial claim, and must allow at least two years from the date it issues a written denial to file a lawsuit.11Office of the Law Revision Counsel. 49 USC 14706 – Liability of Carriers Under Receipts and Bills of Lading The two-year clock doesn’t start until the carrier formally disallows part of the claim in writing with reasons. A vague settlement offer isn’t a denial, and neither is a letter from the carrier’s insurer unless it explicitly says the claim is disallowed and identifies the insurer as acting on behalf of the carrier.
How Long to Keep the Records
Under 49 CFR Part 379, motor carriers must retain bills of lading, shipping orders, and paid freight bills for at least one year.12eCFR. 49 CFR Part 379 – Preservation of Records That’s the regulatory floor for carriers, but treating one year as a company-wide standard creates obvious gaps: overcharge claims can be filed up to 18 months after delivery, and cargo damage lawsuits can be brought up to two years after a claim denial. Many shippers and third-party logistics providers retain freight payment records for at least three years as a practical matter. Digital archiving makes that inexpensive, and it’s far cheaper than reconstructing a shipment during litigation with no documentation.