Container Demurrage and Detention Fees: How to Avoid Them at US Ports (2026)

# Container Demurrage and Detention Fees: How to Avoid Them at US Ports (2026)

Demurrage and detention charges are the single largest avoidable line item on most ocean freight invoices. A single 40-foot container sitting an extra five days at a US port can rack up $1,000 to $2,500 in demurrage on top of the base ocean rate — and detention charges, which run while the empty container sits at your warehouse, can stack on top of that at another $75 to $300 per day. Across a typical import program of 50 to 200 containers per year, unmanaged D&D is routinely $40,000 to $250,000 of pure margin leakage.

This guide breaks down how demurrage and detention actually work in 2026, the current per-diem rate ladders at the major US ports, the Federal Maritime Commission rules that let you dispute unjustified charges, and a concrete checklist of operational moves that keep D&D off your ledger. If you are importing through the Port of Charleston, LA/Long Beach, NY/NJ, Savannah, or any East or Gulf Coast port, the mechanics are the same — the free-time tiers and per-diem numbers just vary.

Demurrage vs. Detention: The Difference That Determines Who You Fight

Importers routinely use the terms interchangeably, and that is the first mistake, because demurrage and detention are billed by different parties, governed by different contracts, and contested through different channels.

Demurrage is the charge you pay when a full container sits at the marine terminal longer than the allotted free time. The clock starts when the vessel is discharged and the container is available for pickup. The charging party is the ocean carrier (who leases or operates the terminal space), but the rate schedule is usually set by the marine terminal operator. Demurrage ends the moment the container leaves the terminal gate on a chassis.

Detention is the charge you pay when the container sits outside the terminal — typically at your warehouse, a customs exam site, or a transload facility — longer than the allotted free time. The clock starts when the container leaves the terminal gate and ends when the empty is returned to the carrier's designated yard. The charging party is always the ocean carrier. Because the container is off-terminal, detention rates are set in your service contract with the carrier, not by any terminal.

Per diem is often used as a synonym for detention, but technically refers to any daily container-use charge. Most carriers refer to detention as per diem on the invoice. Chassis use is a separate per-diem charge billed by the chassis pool (typically TRAC, FlexiVan, DCLI, or Consolidated Chassis Management) and runs independently of both demurrage and detention.

If you have a $3,400 D&D charge on an invoice, the first question to answer is: how much of this is demurrage (inside the terminal), how much is detention (outside the terminal), and how much is chassis per diem? Each line is contested differently.

How Free Time Works in 2026

Free time is the number of days the container can sit without accruing charges. It is set by the carrier's tariff or your service contract and varies by port, direction, and container type.

Typical 2026 free-time allowances for US import containers:

- Port of Los Angeles / Long Beach: 3 to 5 calendar days of demurrage free time (4 is the most common default for non-contract shippers); 5 to 7 days of detention free time - Port of New York / New Jersey: 5 calendar days of demurrage free time (most terminals); 5 to 7 days of detention free time - Port of Savannah (GPA): 5 calendar days of demurrage free time for most accounts; 7 days of detention free time - Port of Charleston (SCPA): 5 calendar days of demurrage free time at Wando Welch and the Hugh K. Leatherman terminal; 7 days of detention free time on most contracts - Port of Houston: 4 calendar days of demurrage free time; 5 days of detention free time - Port of Seattle / Tacoma: 4 calendar days of demurrage free time; 5 days of detention free time

Weekends and federal holidays count against free time at most terminals, although some West Coast terminals pause the clock on Sundays and holidays. If the terminal is physically closed (for example, an ILA strike day or a severe weather closure), the FMC's Interpretive Rule 49 CFR § 545.5 generally requires the carrier to not charge demurrage for those days. Always confirm your terminal's closure-day policy in writing before disputing a charge.

Contracted volume shippers routinely negotiate extended free time — 7 days of demurrage and 10 days of detention is common for mid-sized importers moving 50+ containers annually, and larger importers can negotiate 10 and 14 days. If you ship through your beneficial cargo owner (BCO) contract rather than a freight forwarder's NVOCC tariff, request extended free time as a line item in your next contract cycle. It is almost always granted at some level.

Current 2026 Per-Diem Rate Tiers

Both demurrage and detention use escalating per-diem tiers: the daily rate increases as the container stays longer. This escalation is deliberate, because the carrier wants to push containers out of their yard and back into rotation as quickly as possible. The tier structure is also why a single week of neglect can produce a four-figure invoice.

Representative 2026 demurrage rates at major US ports (dry container, per day, per container):

- Days 1–4 past free time: $175 to $225 per day - Days 5–10 past free time: $300 to $400 per day - Days 11–20 past free time: $500 to $650 per day - Days 21+ past free time: $750 to $1,100 per day, plus risk of general order (GO) warehouse removal

A container that sits 10 days past free time typically incurs roughly: 4 days × $200 + 6 days × $350 = $800 + $2,100 = $2,900 in demurrage.

Representative 2026 detention rates (per day, per container, after free time):

- Days 1–5 past free time: $75 to $125 per day - Days 6–10 past free time: $150 to $225 per day - Days 11+ past free time: $275 to $375 per day

Reefer (refrigerated) container D&D runs 3 to 4x these dry rates, and overweight or hazardous containers typically add a 25% to 50% surcharge per day. If you are importing reefer cargo and miss your free-time window by even three days, the per-diem bill alone can exceed the ocean freight rate on the container.

Chassis per diem is billed separately by the chassis pool and typically runs $25 to $45 per day after free time. On West Coast ports using the PierPass/Peel-Off model, chassis per diem can compound with street-dwell incentive programs, so it is worth pulling chassis invoices separately from carrier invoices to understand where the charges are landing.

Why D&D Charges Spike: The Six Operational Failures

D&D bills do not come from nothing. In almost every case, the underlying cause is one of six operational failures. Fix the root cause and the charge goes away.

1. Customs clearance delay. The single largest D&D driver is an entry held up in customs — missing or incorrect HTS classification, undervaluation flag, missing PGA filing (FDA, USDA, EPA), or a random exam. Containers held for a CBP exam at the Centralized Examination Station (CES) can burn 5 to 14 days of free time before release. The April 2026 CBP CAPE refund filings and other entry-type adjustments have pushed some clearance lanes to multi-day queues.

2. Missing documentation. Bill of lading release errors are a leading cause of demurrage. If the carrier has not released the telex or surrendered original bills of lading before vessel discharge, your drayage carrier cannot pick up the container — full stop. See our bill of lading guide for the release-sequence errors that most often stall cargo at the pier.

3. Drayage carrier capacity. In peak weeks at LA/Long Beach, Savannah, and Charleston, drayage carriers often cannot place a truck on a container within free time. Trucker appointments at terminals can book out 3 to 5 days in advance in tight weeks, and the PierPass and TIS appointment systems at several terminals penalize last-minute changes with flip fees on top of demurrage.

4. Warehouse receiving capacity. If your receiving dock is full, the drayage carrier cannot deliver the container, which puts you into detention. This is the most common cause of detention in inbound programs that are demand-spiky or seasonally peaked (consumer electronics pre-holiday, apparel pre-Q1, outdoor goods pre-spring).

5. Chassis shortages. Chassis pool imbalances continue to be a structural issue at LA/Long Beach and increasingly at Savannah and Houston. A container sitting on the dock without a chassis accrues demurrage — even when the drayage carrier is ready to roll.

6. Empty return restrictions. After you unload, you still need to return the empty container to a designated depot within the detention window. Carriers frequently restrict empty returns to specific days or specific depots, and when those depots are closed for capacity, the detention clock keeps running. This is the most common source of "I unloaded on time, why am I being charged detention?" disputes.

FMC Rules That Protect You: The 2022 OSRA and the 2024 Billing Rule

Two federal rules give importers meaningful leverage against unjustified D&D charges. Most importers and customs brokers are unaware of how specifically these rules define a valid invoice.

Ocean Shipping Reform Act of 2022 (OSRA-22). Codified at 46 U.S.C. § 41104(a)(15), this statute made it an unfair practice for ocean carriers to assess D&D charges that do not satisfy the FMC's "reasonableness" standard. The test: D&D charges must incentivize the movement of cargo, not punish the shipper for conditions the shipper cannot control. Charges assessed for days when the terminal is closed, the empty return depot is full, or there is no chassis available can be contested under OSRA-22.

FMC Final Rule on Demurrage and Detention Billing (49 CFR § 541, effective May 28, 2024). This rule sets strict requirements for what must appear on a D&D invoice, including:

- The specific container number, vessel name, and bill of lading number - The free-time start and end dates - The specific per-diem rate applied for each day - A clear statement of the contract or tariff that sets the rate - The name and contact information of the billing party, distinct from the carrier

Crucially, the rule gives the billed party 30 days from the invoice date to dispute the charge, and requires the carrier to respond to the dispute within 30 days with either a resolution or a detailed written justification. Charges that do not meet the invoice-content requirements are not legally enforceable. If your D&D invoice is missing any of the required data elements, you have a strong basis to withhold payment pending correction.

In practice: roughly 15% to 30% of D&D invoices do not fully comply with the billing rule on first issuance, particularly on the free-time start date and the rate-tier documentation. Before paying any D&D invoice over $500, run it through the rule's content checklist.

Nine Operational Moves That Prevent D&D Charges

The FMC rules help you after the fact. Operational discipline keeps you out of the invoice cycle in the first place. The following moves are ordered by the size of the D&D savings they typically produce on a mid-sized import program.

1. Pre-file your customs entry before vessel arrival. Your customs broker can file entry 5 days before the vessel arrives at the first US port under the pre-filing window. Pre-filed entries that clear on arrival eliminate the clearance-day portion of the demurrage window entirely. Pair this with a clean ISF (Importer Security Filing, 10+2) submitted at least 24 hours before loading at origin — ISF violations are a leading cause of cargo being held.

2. Book drayage before vessel arrival, not after. Most importers wait for the carrier's arrival notice before booking drayage. At busy ports, this puts your appointment 2 to 4 days out. Book drayage when the vessel loads at origin and lock in an arrival-day or day-after pickup window.

3. Use a single drayage carrier with terminal account relationships. Single-source drayage carriers with a dedicated TIS (Terminal Information System) and PierPass account at your port typically clear containers 24 to 48 hours faster than a broker-rotated carrier pool. The volume discount you lose by not shopping every container is small compared to a single $1,500 demurrage event.

4. Route through a port with a nearby bonded warehouse or FTZ. Ports with bonded warehouses or foreign-trade zones within drayage range let you move the container off the terminal clock before customs clearance is complete, converting demurrage exposure into much cheaper bonded storage time. The Port of Charleston has several options in this category close to the terminal gates.

5. Monitor free-time expiration daily, not weekly. Set your TMS or spreadsheet to flag containers at day 2 of free time, day 4, and day 5 (the typical first-tier expiration). Many 3PL operators run this check once per week, which guarantees some slippage. A daily check at 8 a.m. prevents 80% of avoidable D&D events.

6. Negotiate extended free time in your next carrier contract. Extended free time is one of the cheapest concessions for carriers to give because most contracted cargo clears inside the base window anyway. A single service contract round that moves demurrage free time from 5 days to 7 days is typically worth $400 to $800 per avoided event on your exception containers.

7. Require empty-return slot booking at drayage dispatch. Instruct your drayage carrier to book the empty-return appointment at the same time they book the pickup. Skipping this step is the most common cause of detention charges on containers that were otherwise unloaded inside free time. Many carriers now release the empty-return slot only 24 to 48 hours in advance, which is too late if your dock is running behind.

8. Audit every D&D invoice within 30 days. Per the FMC 2024 rule, disputes must be filed within 30 days of invoice to reset the payment clock. Build a weekly audit routine: each Friday, review every D&D line item from the prior 7 days against the billing-rule content checklist, flag invoices with missing data, and submit the dispute before the 30-day clock runs. A disciplined auditor typically recovers 8% to 14% of gross D&D spend.

9. Transload at origin or near-port to break the free-time clock. If you are importing full container loads that could ship as loose cartons past customs clearance, transloading near the port converts the rest of the dwell time from container-attached (D&D) to pallet-attached (warehouse storage, which is 80% to 95% cheaper). This is the single largest lever for consumer-products importers with long inland moves. Our team at Cate Freight in Charleston runs transload programs for exactly this reason — see the warehouse cost estimator and request a quote on the homepage.

How D&D Fits into Landed Cost — and Why Your Duty Calculator Is Not Enough

D&D is the most commonly omitted line item in landed cost models, and it is also the line item with the widest per-shipment variance. A product with a calculated 48% landed cost (including Section 301, Section 232, and Section 122 tariffs) can see actual landed cost drift to 55% to 62% when D&D is included, depending on how tightly the import program is run.

The Landed Cost Calculator lets you model duties, freight, and fees, but D&D is best modeled as a risk reserve rather than a fixed cost: add a 2% to 5% contingency on the ocean freight portion of the landed cost, with the percentage depending on your historical D&D rate. A clean import program averages 1% to 2% of ocean freight in D&D; a chronically late program runs 8% to 12%.

For a complete methodology on bringing D&D into your landed cost model, see how to calculate landed cost.

The Bottom Line

Container demurrage and detention are the most controllable "uncontrollable" cost in ocean freight. Between pre-filed entries, booked-ahead drayage, disciplined free-time monitoring, FMC-backed invoice audits, and the right port geography, most importers can cut D&D spend by 40% to 70% within a single quarter of focused operational tightening. The importers who pay six-figure D&D invoices year after year are not paying them because the charges are unavoidable — they are paying them because no one at the company owns the ten-minute daily routine that prevents them.

If your program is bleeding D&D charges at the Port of Charleston, Savannah, or any East Coast port, and you are considering transload or bonded storage to break the free-time clock, our team at Cate Freight can run the math and stand up the operation inside 30 days. Use the warehouse cost estimator to benchmark, the duty & tariff calculator to model the full landed cost, and the homepage quote form for a direct conversation.

D&D is not the ocean carrier's problem. It is yours — and it is fixable.

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