Demurrage and Detention: A Forwarder's Guide

The nine largest ocean carriers serving U.S. trades collected $15.4 billion in demurrage and detention charges between April 2020 and March 2025, according to the Federal Maritime Commission. For freight forwarders caught between carriers and shippers, that number represents one of the largest controllable cost categories in the business — and one of the least systematically managed.

Demurrage and detention charges aren’t new. But the combination of shrinking free time, stricter carrier enforcement, and recurring port congestion has turned them from an occasional nuisance into a structural margin threat that every forwarder needs a system to handle.

Why Demurrage and Detention Costs Keep Climbing

D&D charges hit an inflection point during the pandemic-era congestion crisis and never fully retreated. FMC data shows that D&D amounts collected were 85% higher at their peak in Q4 2024 compared to Q2 2020. While Q1 2025 saw a 24% quarter-over-quarter decline in billings, the structural drivers haven’t disappeared.

Three forces keep pushing costs up:

Shrinking free time. Carriers have systematically reduced the free time included in standard tariffs. At major Asian ports — Shanghai, Shenzhen, Singapore, Busan — standard container free time runs 3–5 days before demurrage kicks in. A decade ago, 7–10 days was common on many trade lanes.
Faster-escalating rate tiers. Most carriers now use tiered D&D rate structures where charges jump sharply after each threshold. Days 1–3 might cost $100/container, days 4–7 jump to $200, and beyond day 7 you’re looking at $300+ per day. The jump from one tier to the next can double your exposure overnight.
Stricter enforcement. Carriers that once routinely waived D&D charges for good customers have tightened their grip. D&D revenue has become a line item that carrier finance teams actively manage — not an afterthought they write off.

The result: even a minor disruption — a customs hold, a late truck, a client who doesn’t pick up — triggers charges that compound fast.

The Real Cost of D&D Beyond the Invoice

The D&D charge itself is just the visible part. For forwarders, the real cost is the operational disruption it creates:

Tied-up containers block new bookings. Every container sitting past its free time is one you can’t rotate into the next shipment. In LCL and NVOCC operations where container turnover speed matters, this directly reduces throughput.
Customer disputes burn time and trust. When D&D charges get passed to the shipper, the conversation rarely goes smoothly. Who was responsible for the delay? Could it have been avoided? These disputes eat your ops team’s time and erode client relationships.
Margin erosion stays hidden. Unlike surcharges — which are visible at quoting — D&D often surfaces after the shipment is already invoiced. The forwarder absorbs it or goes through the awkward process of billing retroactively. Either way, the margin you quoted is not the margin you realize.
Cash flow timing. Carriers debit D&D from your account before you’ve collected from the shipper. On a high-volume lane where containers routinely go past free time, this creates a cash flow gap that compounds month over month.

An illustrative example: A mid-size forwarder handling 400 containers per month with an average of 1.5 excess days at $175/day pays roughly $105,000/month in avoidable D&D — $1.26 million annually. That number can exceed net profit on many trade lanes.

How Do Free Time Allowances Work?

Free time is the period after a container arrives at the terminal (for demurrage) or is picked up from the terminal (for detention) during which no charges accrue. Once free time expires, the meter starts running.

The challenge for forwarders is that free time varies across four dimensions:

Carrier. Maersk, MSC, Hapag-Lloyd, and CMA CGM all set different free time policies. There’s no industry standard.
Port and terminal. The same carrier may offer different free time at different ports. Singapore’s terminals operate under different conditions than Rotterdam’s or Santos’s.
Trade lane and direction. Inbound vs. outbound, import vs. export, FCL vs. LCL — each combination may carry different free time terms.
Contractual agreement. Named account customers can negotiate extended free time as part of their service contract. But that extension has to be tracked per customer, per carrier, per trade lane.

This four-layer variability is why most forwarders struggle with D&D management. Determining the correct free time for any given container requires knowing the carrier, the port, the direction, and the customer’s contractual terms — then comparing that against actual container dwell time in real time.

Without a system that handles these cascading lookups, the typical forwarder discovers they’ve exceeded free time after the charge has already hit.

Five Practices That Reduce D&D Exposure

1. Track free time per container, not per shipment

D&D charges accrue per container. A single FCL shipment has one container to track. A consolidation might have cargo spread across five. Each container has its own free time clock — track them individually.

2. Set alerts before free time expires, not after

The most expensive D&D charges are the ones you didn’t see coming. Trigger alerts at 24 and 48 hours before free time expires. At that point, you can still coordinate pickup, push a customs clearance, or request a carrier extension.

3. Negotiate free time in every carrier contract

Free time is negotiable. When reviewing carrier contracts, don’t just negotiate the ocean rate — negotiate the D&D terms. An extra 2 days of free time on a high-volume lane can save more money than a $50/TEU rate reduction.

4. Build D&D risk into your quoting

If a trade lane consistently runs past free time — because of congestion at the destination port, slow customs clearance, or unreliable inland transport — your quotes should reflect that risk. Either build a buffer into the margin or add a D&D clause to your terms of sale. We covered the broader gap between quoted and realized margins in a previous post.

5. Dispute systematically using FMC rule requirements

The FMC’s Final Rule on Detention and Demurrage Billing Practices, effective since May 28, 2024, requires carriers to include specific information on every D&D invoice — including the container number, dates, free time calculations, and the rate basis. Under the rule, if a D&D invoice is missing any required element, the billed party has no obligation to pay.

This is a powerful tool for forwarders who audit their D&D invoices systematically. Every invoice should be checked against the rule’s requirements before payment.

What the FMC’s Billing Rule Means for Forwarders

The Ocean Shipping Reform Act of 2022 directed the FMC to establish binding rules for D&D billing. The resulting Final Rule (46 CFR Part 541), effective May 28, 2024, changed the landscape for forwarders operating in U.S. trades.

What carriers must include on every D&D invoice:

Container number and the date range for each charge
Free time start and end dates, with calculation methodology
The rate or rate basis for each charge
Total amount due in a specified currency
Contact information for disputes

What forwarders should know:

30-day invoicing window. Carriers must issue D&D invoices within 30 calendar days of when the charge was incurred. Late invoices are challengeable.
Missing elements = no obligation to pay. If any required element is absent, you can withhold payment until the invoice is corrected.
Partial court vacatur (September 2025). The U.S. Court of Appeals set aside one provision — the restriction on who carriers can bill — but left all other billing-practice requirements intact.
U.S. trades only. This rule applies to carriers serving U.S. trades. Different jurisdictions have their own D&D frameworks. UNCTAD has published guidance on the global regulatory picture.

For forwarders who build a compliance check into their D&D review process, this rule is a direct cost-saving tool. For those who pay D&D invoices without auditing them, it changes nothing.

Frequently Asked Questions

What is the difference between demurrage and detention?

Demurrage is the charge for keeping a loaded container inside the port terminal beyond the allotted free time. Detention is the charge for keeping an empty container outside the terminal — typically at a warehouse or shipper’s facility — beyond the carrier’s allowed return window. Both are time-based charges that accrue daily once free time expires.

How much do demurrage and detention charges cost per container?

Rates vary by carrier, port, and container type. Typical structures start at $75–$150 per container per day and escalate to $200–$300+ in later tiers. Drewry has noted that D&D costs can exceed negotiated ocean freight rates in some cases, making them one of the most significant cost variables in container shipping.

Can I dispute a demurrage or detention invoice?

Yes. Under the FMC’s Final Rule effective since May 2024, every D&D invoice must contain specific information including free time calculations, rate basis, and container details. If any required element is missing, the billed party has no obligation to pay until the invoice is corrected. This applies to carriers operating in U.S. trades.

How long is free time before demurrage starts?

Standard free time ranges from 3 to 7 days depending on the carrier, port, and trade lane. Major Asian ports typically allow 3–5 days, while some European and Latin American ports offer 5–7 days. Free time can be negotiated as part of carrier service contracts — an often overlooked lever for high-volume forwarders.

Does the FMC demurrage rule apply outside the United States?

No. The FMC’s Final Rule on D&D billing (46 CFR Part 541) applies only to carriers serving U.S. trades. International D&D practices vary by jurisdiction. UNCTAD has published guidance on global D&D practices, and some national authorities are developing their own frameworks modeled on the FMC’s approach.

How Tier2 Cargo Tracks Demurrage and Detention

The four-layer variability in D&D — carrier, port, trade lane, and customer agreement — is built into Tier2 Cargo’s demurrage and detention module. The system uses a 4-level cascading lookup to determine the correct free time and tiered rate for any container: it checks customer-specific agreements first, then carrier-port-direction combinations, then carrier defaults, and finally system-level fallbacks.

When a container approaches its free time limit, the system flags it before charges accrue — not after. Because D&D tracking is integrated with the full shipment lifecycle from booking through settlement, the financial impact shows up in your margin calculation automatically. You don’t discover the D&D cost at month-end; you see it as it develops.

For forwarders handling tiered rate structures — where charges escalate from $100/day to $300/day across different time windows — Tier2 Cargo applies the correct tier automatically based on elapsed time. No spreadsheets, no manual rate lookups, no surprises.

See how Tier2 Cargo manages D&D or book a walkthrough.

The forwarders who control D&D costs aren’t the ones who negotiate the lowest ocean rates. They’re the ones who see the clock ticking before it costs them money — and have the systems to act on it before free time runs out.