Demurrage and Detention Explained: The Complete Guide for Logistics Teams

TL;DR: Demurrage accrues when a container sits inside the terminal past free time. Detention accrues when you hold the carrier's equipment outside the terminal. The shipper or consignee on the bill of lading typically faces liability for both. Rates vary by carrier, port, and container type. Maersk's 2026 U.S. import demurrage tariff (excluding Newark, Miami, Port Everglades, and Philadelphia) charges dry containers $300 to $395 per day from day five, after four free days. Its detention tariff charges $210 to $290 per day after four free working days. Track dwell in real time rather than waiting for carrier milestones, and dispute charges with timestamped gate records and location data that contradict the invoice.

Carriers and terminal operators must issue demurrage and detention invoices within 30 calendar days of when the charges were last incurred. By the time you see the bill, the evidence you need to dispute it has scattered across carrier portals, terminal systems, and email threads. The Federal Maritime Commission (FMC) now requires carriers to include specific data on every invoice, and under the Ocean Shipping Reform Act of 2022 (OSRA 2022), the billing party must show the charge is reasonable. Your disputes still depend on your own records of when the container actually moved and who controlled it during the delay. This guide explains the difference between the two charges, who pays, what they cost in 2026, and how to use independent tracking data to catch dwell before free time runs out.

Key Differences in Demurrage and Detention

Demurrage and detention both penalize delay, but they apply to different physical states of the container and follow different liability rules. Confusing them leads to misallocated costs and failed disputes.

Defining Demurrage for Logistics Teams

The terminal operator or ocean carrier charges demurrage when your cargo remains inside marine terminal facilities after free time expires. Under the FMC's detention and demurrage rules, this charge covers the terminal space your container occupies from discharge until gate-out. Your liability depends on your contractual relationship with the party billing the charge and on the nature of the delay. Charges that accrue while circumstances beyond your control, such as government holds or terminal closures, prevent pickup are open to dispute under the FMC's reasonableness standard. Free time varies by carrier tariff and port. For example, Maersk's 2026 U.S. import tariffs allow four working days for dry containers.

Defining Carrier Detention Costs

Carriers charge detention when you hold their equipment outside the terminal beyond free time. Per FMC guidance, you incur this charge from the moment you pick up the full container until you return the empty to the designated depot or port. The ocean carrier bills this as an equipment rental fee for the container while it sits in your custody. Free time after pickup is set by the carrier tariff and varies by carrier and port. For example, Maersk's 2026 U.S. import detention tariff allows four working days before daily charges begin, counting any day a gate is open for container pickup, Monday through Saturday.

Detention vs. Demurrage: The Key Difference

The distinction determines which party you dispute with when the invoice arrives. Demurrage involves terminal space, while detention involves equipment custody. You can incur both when a container sits at the port past free time, then sits at your warehouse before empty return.

The rates above come from Maersk's 2026 U.S. import demurrage tariff (excluding Newark, Miami, Port Everglades, and Philadelphia) and its 2026 U.S. import detention tariff for dry containers, not industry-wide figures. Other carriers, ports, and container types charge different amounts. Source: Maersk's 2026 U.S. import demurrage tariff, Maersk's 2026 U.S. import detention tariff, and FMC detention and demurrage guidance.

Identifying Liable Parties for Detention Fees

Liability follows the bill of lading (BOL), but FMC rules and contract terms determine which specific party faces the charge.

Liability for Demurrage and Detention

Carriers hold the shipper or consignee listed on the BOL primarily liable for demurrage and detention charges. Carriers must also include the certification statement that the FMC's 2024 rule requires on each invoice. Separately, if they cannot prove the container was available for pickup, you can challenge the charge.

Managing Multimodal Handoff Charges

Charges accrue at handoffs where custody is unclear, such as when a container sits at a rail yard while the ocean carrier and drayage provider dispute equipment control. Under 46 CFR Part 541, carriers must include specific invoice information and the required certification statement. A terminal operator may bill you directly even if you contracted with the ocean carrier. In September 2025, the U.S. Court of Appeals for the D.C. Circuit set aside the section of the FMC rule that limited who could receive a demurrage or detention invoice, as summarized by the FMC. The rest of the rule remains in effect, so whether a direct invoice is valid now depends on the contractual relationships in your transaction. Document the custody chain with gate-in and gate-out timestamps to establish who controlled the container during the delay.

Drayage Charges and Billing Responsibility

Drayage providers face detention exposure when they cannot return empties due to port congestion or lack of appointments. The FMC's 2020 Interpretive Rule says detention charged when empty containers cannot be returned is likely to be found unreasonable, absent extenuating circumstances. Under OSRA 2022 and FMC rules, the carrier must establish that its charges are reasonable, not the trucker or third-party logistics provider (3PL). If your drayage provider cannot return the empty, the dispute is stronger with their timestamped records of appointment attempts and gate closures. Without them, the carrier has room to defend the per diem charge.

Standard Fee Structures for Detention and Demurrage

Carriers structure fees to escalate sharply after free time expires, which compounds your cost when you delay decisions.

Daily Demurrage and Detention Rates

Published 2026 carrier tariffs use tiered pricing that escalates the longer a container stays out. Maersk's 2026 U.S. import detention tariff allows four working days free, then charges $210 per day for days 5 to 8, $260 per day for days 9 to 12, and $290 per day from day 13. At Maersk, operating reefer detention runs about twice the dry rate ($430 per day in the first tier vs. $210 for dry) and starts after three free days instead of four.

Third-Party Rail and Chassis Costs

Rail dwell and chassis rentals create additional exposure beyond ocean carrier invoices. At the Ports of Los Angeles and Long Beach, rail dwell reached 7.19 days in September 2026. These third-party costs often arrive as separate invoices from the ocean carrier's detention bill.

Calculating Cumulative Fee Growth

Fees do not grow linearly. Carriers apply tiered rates where each day falls into a specific price band. Here is how charges accumulate for a single 40-foot dry container under Maersk's demurrage rates, counted in days after discharge: days 1 to 4 are free, then $300 per day for days 5 to 8. Then, $345 per day for days 9 to 13, and $395 per day from day 14.

On day 14, the cumulative charge reaches $3,320 because each day is priced by the tier band it falls into: days 5 to 8 at $300 each, days 9 to 13 at $345 each, and day 14 at $395. This compounding structure makes early intervention critical.

Managing Allowed Dwell and Grace Periods

Free time is your main buffer against these charges. Managing it requires knowing exactly when the clock starts and what events can pause or extend it.

Free Time Benchmarks per Shipment Type

Free time varies by equipment type, carrier, and port, and carriers count it differently. Maersk's 2026 U.S. import tariffs allow four working days for dry container detention and demurrage, counting any day a gate is open for pickup, Monday through Saturday. Maersk allows three days for operating reefer detention. The clock start time is carrier-specific. Under Maersk's tariff, demurrage free time starts at 0800 on the first business day after discharge, except at Los Angeles and Long Beach (LA/LB), where it starts at 3:00 am the day after discharge. Chassis rental fees apply per day after the provider's grace period, which depends on the provider and pool agreement.

Identifying Detention and Demurrage Triggers

Triggers include customs exams, appointment unavailability, and chassis shortages. Government holds and exams sit outside your control, so you can dispute resulting charges when you document that the container could not be retrieved. You can also dispute terminal closures, strikes, or carrier-caused delays on a case-by-case basis. The trigger point is usually the "available for pickup" notification. If the carrier cannot prove container accessibility when claimed, you can challenge subsequent charges.

Handling Charges During Port Closures

When ports close for weather, labor action, or security incidents, free time does not always stop. Some carrier tariffs, including Maersk's, exclude full-day facility closures from free time. Check yours. Where a tariff has no such exclusion, the FMC's 2020 Interpretive Rule says detention charged when empty containers cannot be returned is likely to be found unreasonable, absent extenuating circumstances, but you must document the closure with timestamps and official port announcements. Under 46 CFR 541.8, carriers must give you at least 30 calendar days from the invoice date to request mitigation, refund, or waiver. Attach evidence that the gate was closed or appointments were unavailable during the disputed period.

How to Avoid Demurrage Charges

Prevention requires shifting from reactive status checks to proactive dwell management. You need to know a container is sitting before free time expires, not after the invoice generates.

Sync Pickup Windows with Port Capacity

Port congestion creates artificial detention risk when truckers cannot secure appointments. At Los Angeles and Long Beach, truck dwell was 3.18 days in September 2026 while rail dwell reached 7.19 days. Sync drayage capacity with real-time port conditions rather than static schedules. When rail dwell runs six days or longer, schedule trucker pre-bookings around the container's expected availability for pickup rather than a fixed number of days after discharge.

Avoid Demurrage via Active Monitoring

Carrier-reported milestones show where a container was at its last scan. A tracker on the container reports on preconfigured transmission schedules, whatever the carrier's feed says. Geofence alerts notify you when a container enters or leaves a port, rail yard, or facility. Tive's global cellular, WiFi, and GPS trackers transmit independently of carrier reporting, so you see that a container has sat for 48 hours while the carrier's last milestone still shows "discharged." This gap between carrier-reported status and ground-truth location is where demurrage charges can build unnoticed.

Coordinate Chassis, Warehouse, and Trucker Availability

Detention can stem from warehouse congestion as well as port delays. A container you pick up on day two of free time may sit at your facility for 10 days waiting for dock space. Coordinate drayage with warehouse labor schedules, and use lane and carrier scorecards to identify which facilities consistently hold containers beyond free time. Tive's patented bi-directional connectivity enables you to adjust tracker settings in transit, increasing reporting frequency as the container approaches the return deadline.

Pinpoint Delays at Transfer Points

Multimodal shipments can lose visibility at handoffs such as port to rail, rail to truck, and carrier to carrier, where demurrage risk can build. Independent tracking data shows whether the delay occurred at the terminal (demurrage liability) or after pickup (detention liability), which determines which invoice you dispute and which party you pursue for recovery.

How to Successfully Challenge Detention Bills

Disputes fail when evidence is scattered or stale. Successful challenges require contemporaneous records that contradict the carrier's timeline.

When to Challenge Carrier Invoices

Challenge any invoice that lacks the FMC-required data elements, including container numbers, date ranges, and the required certification statement. Failure to include required information removes your obligation to pay. Also challenge charges that accrue during documented port closures, equipment shortages, or appointment unavailability. The FMC's 2020 Interpretive Rule supports challenges when detention serves no incentivizing purpose because the equipment could not be returned.

Documents Needed for Fee Reversals

Assemble the invoice, BOL, availability notice, gate-out and empty return records, appointment logs, and written refusals to accept equipment. Identify which days you dispute and why. Reed Smith's analysis of the FMC rule explains the billing requirements carriers must meet. Timestamped location data from independent trackers gives you strong evidence of when the container actually moved versus when the carrier claims it moved. For an example of tracker data settling a dispute, E.T.H. Cargo, a pharmaceutical 3PL, used continuous condition records from cold chain monitoring to disprove a damage claim and to confirm a cooling failure that a ground handler had denied. That story involved condition data, not dwell timestamps, but it shows how independent records resolve a disagreement over what happened.

Expected Duration for Claim Reviews

Under 46 CFR 541.8, carriers must give you at least 30 calendar days from the invoice date to request mitigation, refund, or waiver. Carriers must attempt to resolve disputes within 30 calendar days of receipt. If the carrier rejects the claim, you can file a charge complaint with the FMC, though resolution timeframes vary. Keep all original documents.

Criteria for Escalating Disputes

Escalate to the FMC when the carrier fails to respond within the 30-calendar-day window, rejects your claim without addressing evidence, or bills you without a contractual basis for the charge. Also escalate when the invoice lacks the required certification statement. Your complaint is stronger when the carrier cannot prove container availability, or when the invoice lacks required data elements.

Use Live Alerts to Avoid Port Dwell Charges

Real-time alerts help turn demurrage and detention from unavoidable costs into manageable exceptions. The key is setting geofences and dwell thresholds that trigger action before fees accrue.

Automated Alerts Before Fees Accrue

Configure geofence alerts at ports, rail yards, and customer facilities to notify you when a container enters a dwell-risk zone. Tive's Smart Route Deviation Alerts flag a shipment that leaves its planned path. Set geofence and prolonged-stop alerts that flag a container sitting before your free time runs out, so you still have time to reroute, rebook a dock, or escalate to the carrier. This replaces the manual load chasing that ISDB Logistik ended on Belgium-Kazakhstan routes, where the team was able to stop making daily check-in calls to 100 drivers.

Tracking Container Dwell at Ports

Monitor dwell time against your specific free time allowances, not generic port averages. Rail container dwell at LA/LB hit 7.19 days in September 2026 while truck dwell was 3.18 days. If you rely on port-wide averages, you will miss that your specific container has sat for four days on a three-day free time allowance. Independent tracking shows your specific container's position and movement history, which creates a timestamped record that either confirms the carrier's invoice or provides grounds for dispute.

Carrier Scorecards for Chronic Delays

Turn your tracking data into carrier scorecards that show which carriers consistently deliver late to specific ports or hold containers beyond free time. Infinity Global Xpress (IGX) used geofencing and route-deviation alerts to catch a misrouted load, and a major retailer now requires Tive tracking on all their shipments with IGX. These scorecards also survive staff changes and give you defensible data during contract negotiations. If your data shows that 15% of a carrier's containers exceed free time at a specific terminal, you can shift the conversation from individual disputes to systemic improvement.

Estimate the return on investment (ROI) of real-time visibility on your highest-risk lanes with the Tive ROI Calculator.

FAQs

What is the Difference Between Demurrage and Detention?

Demurrage is charged by the terminal or carrier for cargo sitting inside the port past free time. Detention is charged by the carrier for holding their equipment outside the port beyond the allowed days. Demurrage covers terminal space, while detention covers equipment use.

Who is Typically Liable for Demurrage and Detention Charges?

The shipper or consignee on the bill of lading typically faces liability for both charges.

How Much Do Demurrage and Detention Cost per Day in 2026?

Rates depend on the carrier, port, and container type. Maersk's 2026 U.S. import demurrage tariff (excluding Newark, Miami, Port Everglades, and Philadelphia) charges dry containers $300 per day for days 5 to 8, $345 for days 9 to 13, and $395 from day 14. Its 2026 U.S. import detention tariff charges dry containers $210 per day for days 5 to 8, $260 for days 9 to 12, and $290 from day 13. At Maersk, operating reefer detention runs about twice the dry rate ($430 per day in the first tier vs. $210 for dry) and starts after three free days instead of four.

How Long Do I Have to Dispute a Demurrage or Detention Charge?

Under 46 CFR 541.8, carriers must give you at least 30 calendar days from the invoice date to request mitigation, refund, or waiver. Carriers must attempt resolution within 30 calendar days. FMC charge complaints may follow if the carrier dispute fails.

Can Real-Time Tracking Reduce Demurrage Charges?

Yes, it can help reduce them. Independent tracking alerts you to dwell so you can act before free time expires, allowing you to arrange pickup or dispute availability. Timestamped location data also provides evidence to reverse incorrect charges.

Key Terms Glossary

Bill of Lading (BOL): The contract between shipper and carrier that determines liability for demurrage and detention charges. It lists the shipper and consignee, one of whom typically bears responsibility for fees.

Free Time: The number of days a container can sit at a terminal or remain in your possession before demurrage or detention charges apply. It varies by carrier tariff and port. Maersk's 2026 U.S. import tariffs allow four working days for dry containers.

Dwell Time: The total time a container remains at a specific location from arrival to departure. Rail dwell at the Ports of Los Angeles and Long Beach reached 7.19 days in September 2026.

Per Diem: A daily charge for equipment use, often used interchangeably with detention but specifically referring to the daily rental rate for containers or chassis.

Gate-Out: The moment your container leaves the terminal through the gate, stopping demurrage and potentially starting detention free time. Gate-out records are critical for disputes.

OSRA 2022: The Ocean Shipping Reform Act of 2022, which authorized FMC rulemaking on demurrage and detention billing practices and placed the burden of showing that charges are reasonable on the billing party.