Primary-source baseline captured on 16 July 2026. Carrier acceptance, customs treatment, rates and schedules can change by shipment; recheck the linked authority and the accepting provider before cargo release.
Demurrage in container shipping is a carrier charge generally associated with keeping import or export equipment inside a marine terminal, port or depot beyond the applicable free time. It is not the same as detention, which generally concerns equipment outside those facilities, or terminal storage, which can be charged by a different party. The actual clock, calendar days, exclusions, rate tiers, payer and dispute process come from the carrier tariff, service contract, terminal rules and local law. Buyers should identify the exact event that starts and stops the clock and preserve availability, release, pickup and invoice evidence.
Demurrage trigger, clock, owner and evidence matrix
Use this matrix when cargo approaches arrival or an invoice is received. It converts the word demurrage into testable events and records.
Information-gain asset: Define demurrage in one quotable paragraph, then add trigger, owner, operational consequence, evidence, exception and related-decision modules that dictionary pages omit.
| Control point | Question | Operational owner | Evidence |
|---|---|---|---|
| Free-time start | Which event starts the calendar? | Carrier and terminal | Tariff and availability timestamp |
| Cargo release | Are customs and carrier holds cleared? | Importer and broker | Release references |
| Pickup | Was equipment collected before expiry? | Trucker and consignee | Gate-out and appointment record |
| Invoice | Do dates, rate tier and equipment match? | Contracting party | Invoice and calculation sheet |
| Dispute | What process and deadline apply? | Named claims owner | Written submission and acknowledgement |
Define demurrage by location and event, not by delay alone
A delayed container does not automatically create one universal demurrage charge. The equipment location and tariff clock determine the label.
Maersk’s published terms distinguish demurrage for equipment inside a terminal, port or depot from detention outside those facilities. Other carriers can use combined detention and demurrage products or local terminology. Start every review with the named carrier, equipment, location, import or export direction, applicable tariff or contract, free-time provision and the event definitions in force for the shipment date.
For imports, possible events include discharge, availability, customs or carrier release, last free day and gate-out. For exports, receiving windows, cutoff changes and rolled sailings can matter. Never infer the start date from the invoice heading alone. Reconstruct the physical and documentary timeline, then test the billed calendar against the governing terms and any legal requirements that apply to the location and contracting parties.
- Carrier and equipment number
- Import or export movement
- Facility and availability event
- Applicable free-time rule
- Start, stop and excluded-day treatment
Separate demurrage, detention and terminal storage
The three charges can appear around the same delay but compensate different parties for different resources and periods.
Demurrage usually concerns carrier equipment remaining inside the relevant facility after free time. Detention usually concerns carrier equipment kept outside until return. Terminal storage can concern space occupied at the terminal and may be billed by the terminal operator. Chassis, reefer monitoring, electricity, congestion, appointment, pre-pull and yard charges can be additional. Ask each biller to name the service, clock and tariff instead of grouping every delay cost under demurrage.
One container can move from a demurrage period to a detention period after gate-out, while terminal storage may overlap under another schedule. A combined product may calculate differently. Build a timeline with one row per charge and prohibit duplicate billing for the same contractual service unless the documents explain why separate parties and resources are involved. This distinction is essential when allocating responsibility among importer, broker, carrier, terminal and trucker.
| Charge | Typical location or resource | Common stop event | Proof to request |
|---|---|---|---|
| Demurrage | Carrier equipment inside facility | Gate-out or stated event | Availability, free time and gate record |
| Detention | Carrier equipment outside facility | Empty return or stated event | Gate-out and return receipt |
| Terminal storage | Terminal space or handling | Removal or terminal-defined event | Terminal tariff and inventory record |
| Other accessorial | Chassis, reefer, yard or appointment | Service-specific | Order, usage and rate evidence |
Calculate the clock from the governing tariff and shipment facts
Free days and rate tiers are date-sensitive commercial terms. A generic online calculator cannot identify the correct rule without the shipment documents.
Collect the service contract or quotation, carrier tariff, local free-time schedule, equipment type, discharge or receiving event, availability notice, holds, last free day, gate-out and any approved extension. Determine whether days are calendar, working or facility-operating days and whether holidays, weekends, strikes, weather or carrier-caused unavailability receive special treatment. Record the version and effective date of every rule used.
Recalculate each billed day and rate tier. Match container number, bill of lading, terminal, currency and tax treatment. If the container could not be collected, document why: customs hold, carrier hold, missing delivery order, terminal closure, no appointment, chassis shortage or truck failure. The fact of delay does not automatically decide who pays; responsibility follows the contract, conduct, legal framework and evidence for the actual event.
- Tariff or service-contract version
- Equipment and bill references
- Availability and last-free-day evidence
- Hold and appointment history
- Daily tiers, currency and tax
- Approved waiver or extension
Apply the current U.S. billing-rule boundary correctly
U.S. demurrage and detention invoice reviews should reflect both the 2024 FMC rule and the later court decision, not an outdated summary.
The FMC stated that its final detention and demurrage billing rule took full effect on 28 May 2024 and includes invoice-content, timing and dispute-process requirements. Review the current regulation and official guidance for the actual invoice. Preserve the invoice receipt date, required data fields, dispute submission, supporting evidence and response because a general reference to the rule is not a substitute for applying its elements.
In September 2025, the D.C. Circuit set aside only 46 CFR 541.4, the section specifying who invoices could be sent to. The FMC reported that the remainder of the rule was unaffected. Therefore, do not repeat the vacated billed-party limitation as current law. Identify the contracting and invoiced parties from the active legal text, contract and facts, and obtain qualified advice where liability or regulatory compliance is disputed.
| U.S. review item | Evidence | Boundary | Action |
|---|---|---|---|
| Invoice timing | Receipt and issue dates | Apply active rule text | Record dates immediately |
| Invoice contents | Required shipment and charge data | Do not rely on a summary | Check each field |
| Dispute process | Submission and response log | Contract deadlines can also matter | Use shortest safe deadline |
| Billed party | Contract and current law | Section 541.4 was vacated | Do not cite the set-aside restriction |
Prevent demurrage with a release-critical-path log
Prevention depends on named owners and deadlines across documents, customs, carrier release, terminal access and trucking.
Before arrival, confirm original or electronic bill release, destination charges, importer and broker readiness, product permits, customs data, delivery order and payment authority. Obtain the estimated discharge, availability method and free-time rule. Reserve trucking and receiving capacity provisionally, then update the appointment when the terminal makes cargo available. Set escalation thresholds before the last free day rather than on it.
During the release window, maintain a time-stamped log of each hold, responsible party, promised resolution and next deadline. Share one status version with carrier, terminal, broker, trucker and consignee. After gate-out, retain the interchange receipt and transfer the file to the detention owner for empty return. If a charge occurs, the same log supports calculation, responsibility allocation, waiver requests and a timely dispute.
- Bill and carrier-release owner
- Customs and permit owner
- Terminal availability monitor
- Truck and appointment owner
- Last-free-day escalation
- Gate-out evidence and detention handoff
Worked demurrage example: import container with two holds
A container is discharged on Monday, but the importer sees a customs hold and a separate carrier documentation hold before the stated last free day.
- The team obtains the carrier tariff, terminal availability record, hold timestamps and the formal last free day instead of counting from vessel arrival.
- The broker resolves customs while the consignee clears the carrier hold; each release reference is logged with time and owner.
- The trucker records failed appointment attempts and completes gate-out when both releases and a slot are available.
- When an invoice arrives, the importer checks billed dates, tiers and required data against the event log and files any dispute within the active deadline.
The buyer can distinguish a valid terminal clock from unverified delay days and can allocate prevention and dispute work using evidence.
Failure controls before cargo release
Use this table as a stop-release check. A responsible owner should resolve each trigger against the same cargo and document version before the shipment moves to the next handoff.
| Failure trigger | Operational consequence | Required control |
|---|---|---|
| Demurrage is counted from vessel arrival by default | The calculation can use the wrong start event | Use the applicable tariff and availability evidence |
| Storage and detention are grouped into one charge | Different resources and billers cannot be audited | Build one timeline row per charge |
| The last free day has no named owner | Holds and appointments are escalated too late | Assign a release-critical-path owner before arrival |
| An old summary repeats vacated 46 CFR 541.4 | The invoice review relies on a set-aside billed-party rule | Use current FMC and court materials |
| The invoice is disputed without event evidence | The carrier cannot verify the requested adjustment | Submit a dated calculation and supporting records |
Quote-ready data handoff
Send the inputs together and label estimates. This gives the forwarder, carrier, broker and consignee one controlled starting version instead of a price request assembled from conflicting messages.
- Carrier, bill of lading and container number
- Import or export direction and facility
- Applicable tariff or service contract
- Discharge, availability or receiving event
- Free-time calculation and last free day
- Customs, carrier and terminal hold history
- Appointments, gate attempts and gate-out time
- Invoice date, billed tiers and currency
- Contracting and invoiced parties
- Dispute process, deadline and supporting evidence
Primary sources and verification boundary
These sources support the document, customs or dangerous-goods distinctions used in this guide. They do not replace a product-specific ruling, licensed customs advice or carrier acceptance for the actual shipment.
- U.S. Federal Maritime Commission – Demurrage and detention billing requirements: The FMC states that its detention and demurrage billing rule took effect on 28 May 2024, including invoice content, timing and dispute-process requirements.
- U.S. Federal Maritime Commission – 2025 court decision on demurrage and detention billing: The FMC reports that the D.C. Circuit set aside only 46 CFR 541.4, the section specifying who could receive an invoice, so current reviews must not repeat the vacated billed-party rule as active law.
- Maersk – Detention and demurrage terms: Maersk distinguishes demurrage inside a terminal, port or depot from detention outside those facilities and defines free time and combined treatment, while local tariffs control actual clocks and rates.
Related Sendwin resources and next actions
Use the links below to move from the reference answer into a live shipment decision. Each anchor identifies the destination topic so the relationship remains useful to buyers and search systems.
Place demurrage beside related records in the shipping documents hub.
Connect container charges to the ocean freight FCL and LCL guide.
Review related operational terms in the freight glossary.
Check physical equipment planning with the container loading calculator.
Send the free-time and release assumptions in a shipment quotation request.
Continue the shipping document workflow with the TEU.
Frequently asked questions
The short answers below preserve the responsibility boundary. Confirm the actual cargo, date, lane, importer and accepting provider before relying on a general answer for release.
What is demurrage in shipping?
Container demurrage generally concerns carrier equipment remaining inside a terminal, port or depot beyond applicable free time. The carrier’s active terms and local rules define the actual clock and charge.
What is the difference between demurrage and detention?
Demurrage generally concerns equipment inside the facility; detention generally concerns equipment outside after pickup. Combined products and local terminology can differ, so check the governing tariff.
Who pays container demurrage?
The answer depends on the service contract, tariff, invoiced and contracting parties, applicable law and cause of the delay. Commercial responsibility should be allocated using the actual records, not a universal rule.
Can demurrage be disputed?
A charge can be reviewed through the applicable carrier and legal dispute process. Submit the calculation, event timeline and supporting records within the shortest relevant deadline; success is not guaranteed.
Ready to test the plan against final cargo data? Request a shipment-specific freight quotation.