Carmack Amendment: The Law Behind Interstate Cargo Claims
The Carmack Amendment (49 U.S.C. 14706) is the federal law governing carrier liability for loss or damage to freight moving in interstate commerce. It makes the originating carrier liable with five narrow defenses, requires claims in writing (generally within nine months per the bill of lading — verify current law), generally preempts state-law claims, and allows released-rate liability limits by written agreement. This is informational only, not legal advice.
You hear the name tossed around every time a cargo claim gets denied, but few drivers or owner-operators could explain what the Carmack Amendment actually does. It is the federal statute — 49 U.S.C. 14706 — that sets the ground rules for who is liable when freight moving in interstate commerce is lost or damaged. If you haul interstate, this law is the playing field your cargo claims are decided on.
The Carmack Amendment was originally aimed at railroads in 1906 and later extended to motor carriers. Its core idea is simple: the carrier receiving freight for interstate movement is liable for loss or damage to that freight, with a few defined defenses. That sounds like strong protection for the cargo owner, and in one sense it is — but the statute also gives carriers powerful tools to limit their exposure, including released rates, timely-filing requirements, and short suit windows.
This guide is informational only and is not legal advice. Cargo-claim disputes turn on specific facts, contract language, and current law — if real money is at stake, talk to a transportation attorney before you act. What follows is the framework you need to understand what your shipper is claiming, what your defenses are, and where your motor truck cargo policy fits in.
What the Carmack Amendment Actually Says
The Carmack Amendment makes the carrier liable for 'actual loss or injury to the property' when that property moves in interstate or foreign commerce. Liability attaches to the carrier that receives the property for transportation — usually the originating carrier — and extends through the movement even if another carrier physically damaged the freight. That means a shipper can file against the carrier it tendered the freight to, and that carrier can then seek recovery from whichever connecting carrier actually caused the damage.
The liability standard is close to strict liability: the shipper must show the freight was delivered to the carrier in good condition, that it arrived damaged (or did not arrive), and the dollar amount of the loss. Once that prima facie case is made, the burden shifts to the carrier to prove it was not negligent and that the loss was caused by one of the recognized exceptions — act of God, public enemy, act of the shipper, public authority, or the inherent vice of the goods.
Two things the Carmack Amendment does not do: it does not apply to purely intrastate moves (those are governed by state law), and it does not decide who pays — it decides who the shipper can hold liable and under what rules. Your contract, your bill of lading terms, and your cargo insurance still decide how the money actually moves.
The Written-Claim Requirement
Under Carmack, a shipper or cargo owner cannot simply call you and say the freight was damaged. The claim must be made in writing, it must identify the shipment with enough detail that the carrier can investigate (bill of lading number, date, origin and destination), and it must assert liability and demand a specified or determinable amount of money. A phone call, a text message, or a vague complaint about 'some damage' does not satisfy the requirement.
Most bills of lading also set a deadline for filing that written claim. The generally cited period is nine months from the date of delivery — this comes from the uniform bill of lading terms that most carriers use, not from the statute itself, so verify current law and read your specific bill of lading and contracts. Miss the deadline and the claim can be denied on timeliness alone, regardless of merit.
As a carrier, the lesson runs both ways. When someone asserts damage against you, check immediately whether a proper written claim was filed within the stated period. When you are the one who will seek recovery — for example, against a connecting carrier or under your own claim — file your written claim early and in proper form. Claims handlers reject sloppy filings without a second thought.
Carrier Defenses Under Carmack
The statute recognizes five classic defenses: act of God (a true natural catastrophe beyond the carrier's control), act of the public enemy, act of the shipper, act of public authority, and the inherent nature or vice of the goods. Notice what is not on the list: 'the shipper loaded it wrong' is only a defense if you can tie it to the shipper's act, and 'I didn't know' is never a defense.
The act-of-the-shipper defense is the one most litigated in trucking. It covers improper packing by the shipper, inaccurate descriptions of the freight, and shipper-loaded trailers where the carrier had no reasonable opportunity to inspect. But the defense has a trap: if the damage was plainly visible or the carrier accepted the freight knowing of a defect, courts often hold the carrier accepted the risk. Your pre-trip inspection and your notation of exceptions on the bill of lading at pickup are your evidence — or your absence of evidence.
Inherent vice covers freight that damages itself: produce that ripens and spoils on a normal transit, chemicals that react, goods with a latent defect. For reefer carriers this defense overlaps constantly with temperature claims — and it is exactly why continuous temperature logs matter so much, because they are what separate 'the product was bad' from 'your trailer was too warm.'
Released Rates and Limitation of Liability
Carmack permits carriers and shippers to agree in writing to limit the carrier's liability to a value the shipper declares — this is the 'released rate' concept. The shipper gets a lower freight rate in exchange for capping the carrier's exposure at the declared value. Courts enforce these agreements only when the shipper was given a fair opportunity to choose between the released rate and a higher rate with full liability — the choice has to be real, not buried in fine print.
For carriers, released-rate agreements are a risk-management tool, but they have to be set up before the loss, in writing, with clear evidence the shipper understood the choice. A rate confirmation that merely says 'carrier liability limited to $X per pound' without the required election language may not hold up. This is contract territory where the small print decides outcomes — get it reviewed by a transportation attorney before you rely on it.
Understand the relationship between released rates and your cargo insurance. If you agree to a released rate of $2.50 per pound and a 10,000-pound shipment is a total loss, your maximum liability to the shipper is $25,000 even if the freight was worth $80,000 — but your cargo policy's limit and deductible still govern what the insurer pays you. Shippers who under-declare value and then suffer a loss sometimes turn around and sue on other theories; Carmack generally preempts state-law claims for the same loss, which is why the release usually sticks.
Carmack Preemption: One Law for Interstate Claims
One of the Carmack Amendment's most important features is preemption: for interstate shipments, it generally displaces state-law claims arising from the loss or damage. A shipper cannot usually repackage a cargo claim as a state-law negligence or breach-of-contract suit to get around Carmack's limitations and time bars. Courts apply this preemption broadly.
Preemption cuts both ways. It protects carriers from unpredictable state-law damages, but it also means the shipper's recovery is channeled through the Carmack framework with its defenses and deadlines. Broker-related claims are a gray area that courts continue to litigate — whether a particular broker claim is preempted depends on the claim's nature and the jurisdiction, and this is another place where the 'not legal advice' warning earns its keep.
The practical point for you: when a cargo dispute starts, the first question is always whether the move was interstate. If it was, Carmack is the law, the bill of lading and contract terms fill in the details, and state small-claims theories usually go nowhere. Frame your response accordingly instead of arguing the wrong law.
Where Your Cargo Policy Meets Carmack
The Carmack Amendment decides whether you are liable to the shipper. Your motor truck cargo policy decides whether your insurer pays you for that liability. These are two separate questions, and confusing them causes real mistakes — like assuming 'the claim is under my cargo limit so it's fine' when the claim was never properly filed, or assuming 'Carmack protects me' when your policy excludes the commodity.
Carriers get in trouble in the gap between the two: claims denied by the insurer because of an exclusion (refrigeration breakdown without the endorsement, for example) while the shipper still holds the carrier liable under Carmack. You owe the shipper regardless of what your insurer does. That is why matching your policy to the freight you actually haul — endorsements, commodities, limits, deductibles — matters more than the headline premium.
For a walkthrough of how the claims process itself works once a loss happens, see our guide to the insurance claims process in trucking. And if you haul temperature-controlled freight, where Carmack's inherent-vice defense meets real money, read the reefer temperature claim guide before your next produce load.
Key takeaways
- Carmack governs interstate cargo liability — intrastate moves fall under state law.
- Claims must be in writing, identify the shipment, and demand a sum — generally within nine months per the BOL.
- Five defenses exist: act of God, public enemy, act of shipper, public authority, inherent vice.
- Released rates can cap liability but require a genuine written shipper election.
- Carmack generally preempts state-law claims for the same loss.
- Liability to the shipper and insurance reimbursement are two separate questions.
Questions carriers ask
Does the Carmack Amendment apply to intrastate shipments?
No — it governs interstate and foreign commerce. Purely intrastate moves fall under state law, which varies. If any leg of the movement crosses state lines, Carmack generally applies to the whole through movement.
What makes a cargo claim 'in writing' under Carmack?
A written communication that identifies the shipment (BOL number, dates, origin/destination), asserts the carrier is liable, and demands a specified or determinable sum. Emails and letters qualify; phone calls and vague complaints do not.
Can a shipper sue a carrier in state court to avoid Carmack limits?
Generally no — courts hold that Carmack preempts state-law claims for loss or damage to interstate freight. The claim proceeds under the Carmack framework with its defenses and time limits.
What is a released rate under the Carmack Amendment?
A written agreement where the shipper declares a value for the freight and accepts a lower rate in exchange for capping the carrier's liability at that declared value. Courts enforce it only when the shipper had a genuine choice between the released rate and full liability at a higher rate.
Is this article legal advice?
No. It is an informational overview of a federal statute. Cargo claims turn on specific facts, contracts, and current law — consult a transportation attorney before acting on a real dispute.
Does my cargo insurance decide whether I owe the shipper?
No. Carmack and your contracts decide liability to the shipper; your policy decides whether your insurer reimburses you. You can owe the shipper even when your insurer denies the claim.