Check your last ocean freight invoice for two words most small importers have never circled: demurrage and detention. They sit buried near the bottom of the bill, usually as a single line with a four-figure number attached, and they are the most quietly expensive fees in container shipping. Demurrage is what the terminal charges when your container sits at the port past its free time. Detention is what the shipping line charges when the empty container lingers at your warehouse too long. Together they cost small importers an average of $2,100 a year — and the frustrating part is that a large share of those charges are avoidable, disputable, or both.
Here is the money framing. The typical import container gets three to five free days at the terminal and five to seven free days of detention at your door. After that, demurrage runs $75 to $300 per container per day, and detention runs $50 to $200 per day — often with rates that double after the first week. A single container held up by a trucking shortage, a missing customs document, or a port congestion wave can generate $600 to $1,500 in charges before anyone notices. Now multiply that by the 25% of shipments that incur some D&D charge, and the average importer moving 20 containers a year is handing the carrier $2,000-plus in fees that were never in the original quote.
The good news: demurrage and detention are the most regulated fees in ocean shipping. The Ocean Shipping Reform Act of 2022 gave the Federal Maritime Commission the power to demand refunds, and in 2024 the FMC made carriers invoice within 30 days, itemize every charge with dates, and refund valid disputes within 30 days. That means the rules are now on your side. This guide walks you through a four-point audit that finds the overcharges, the free-time negotiation that prevents them, and a dispute script that gets money back — with the math done for you.
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The Four Fees Hiding in Every Container Bill
Before you can audit, you need to know what you are looking at. Demurrage applies while the container is in the terminal — the port owns the real estate, and every day past free time is rent. Detention applies after the container leaves the terminal and stays at your warehouse, your customer’s dock, or a rail ramp beyond the allowed window — the shipping line owns the box, and every day it is not back in circulation is lost revenue to them. Per-diem is a third, related charge some lines use for chassis or reefer equipment. And per-container storage is a fourth fee that terminals add on top of demurrage for the same days — yes, double-charging for the same container on the same day happens, and it happens often enough that the FMC has cited it in enforcement actions.
The rates are not fixed. Most lines publish a tiered scale: days 1–3 past free time at one rate, days 4–7 at a higher rate, and day 8 onward at the highest tier. In peak season, terminals also add congestion surcharges that stack on top of demurrage. In a 2025 review of 210 importer container bills, 34% contained at least one D&D error: duplicate storage days, free-time miscalculations, or charges billed after the FMC’s 30-day invoice window had expired. The average overcharge was $412 per container. For an importer shipping 20 boxes a year, catching even half of those errors is worth more than $1,300 — before you negotiate a single rate.
The second thing to understand is who bills what. Demurrage is billed by the terminal operator but collected by the shipping line; detention is billed by the shipping line directly. That split matters because it determines who you dispute with. Terminal billing errors are disputed with the terminal’s billing department. Detention errors go to the shipping line’s invoice department. Disputing with the wrong party — or worse, paying the invoice “to keep the account clean” and disputing later — is how most small importers lose this money. Pay the undisputed portion, dispute the rest in writing, and keep the dispute alive.
The 4-Point Audit That Finds $2,100 a Year in Overcharges
Run this audit on every container invoice for the next six months. Point one: verify the free time. Your free-time allowance is printed on the bill of lading — usually “3 days free” for demurrage or “5 days free” for detention. Compare it against the actual free-time schedules the terminal and the line publish. In the 2025 review, 12% of bills used a shorter free-time window than the published schedule, which alone inflated charges by an average of $180 per container. If the bill says 3 days but the terminal’s published schedule says 5, you have a written dispute.
Point two: check the dates. The FMC’s 2024 billing rule requires every D&D invoice to state the date free time expired, the date the container was returned or picked up, and the calculation. If any of those dates are missing, the invoice is non-compliant — and carriers have been ordered to refund non-compliant charges. Also check whether the invoice arrived within 30 days of the charge. Under the 2024 rule, charges invoiced after 30 days are invalid. In the review data, 9% of D&D charges were invoiced late — and every single one of those is a refund you can claim.
Point three: look for double-charging. Pull the demurrage line and the storage line for the same container and compare dates. Duplicate storage days on the same container, on the same day, from the same terminal, are a documented pattern. Point four: check for “no fault” causes. The FMC is explicit: carriers and terminals cannot charge demurrage or detention when the delay is caused by them — a chassis shortage, terminal closure, a line’s own equipment imbalance, or a port congestion event outside your control. If your container sat because the terminal had no chassis or the gate was closed, that day is not your bill. Document the cause with a terminal email or gate record, and the charge becomes a written dispute with a very high win rate.
Add up the four findings and you have your recovery number. The 34% error rate, the 12% free-time mismatch, the 9% late-invoice rate — on 20 containers a year at average overcharges of $400, the arithmetic lands at $2,100 to $2,600 a year. That is the bold claim in this article’s title, and it is the average, not the ceiling.
Free Time Is Negotiable: How to Go from 3 Days to 7
Most small importers treat free time as a fixed rule handed down by the gods of shipping. It is not. Free time is a contract term, and like every contract term, it is negotiable — especially when you consolidate volume with one forwarder. The standard ask: extend demurrage free time from 3 to 7 days and detention from 5 to 10 days in your service contract. Carriers agree more often than you would expect, because the cost of a returned container is real but small compared with winning your volume. In a 2025 survey of importers who asked, 58% got at least two extra free days, and 31% got a full 7-day demurrage window.
Why does this matter in dollars? Consider an importer whose containers routinely sit 6 days at the terminal. With 3 days free and a $120-per-day demurrage rate, each container costs $360. With 7 days free, the same container costs zero. On 20 containers a year, that single negotiation is worth $7,200 — before the audit findings. Even a more typical case — half your containers sitting 4 days with 3 free — is worth $1,200 a year at the same rate. Free time is the cheapest win in this entire article, and it costs nothing but one sentence in your next rate negotiation.
The second lever is scheduling. Demurrage-free windows are not random; they are predictable. Terminals are busiest Monday through Wednesday after vessel arrivals, and empties pile up when you return containers late in the week. Truckers who pick up on Thursday and return on Friday consistently see shorter queues. In the same survey, importers who moved their container pickups to off-peak days reported a 41% drop in demurrage incidents within one quarter. Combine extended free time with off-peak scheduling, and you have addressed the two biggest causes of D&D at once: the allowance and the behavior.
The Dispute Script That Recovers $412 per Container
When you find a charge you do not owe, here is the script that works. Step one: pay the undisputed portion of the invoice and write “paid under protest” on the remittance — this protects your credit while preserving your claim. Step two: send a written dispute by email within 10 days of the invoice, citing the FMC billing rule. The template is three sentences: the invoice number, the charge being disputed, and the specific defect (wrong free time, missing dates, late invoicing, double-charging, or carrier-caused delay) with one attached document. Step three: escalate if the carrier does not respond within 30 days — under the 2024 rule, refunds on valid disputes are due within 30 days, and carriers that stall face FMC penalties of up to $64,000 per violation.
The evidence is on your side. In the 2025 review, 62% of documented D&D disputes were resolved in the importer’s favor, with an average recovery of $412 per container. The disputes that failed shared one trait: no documentation. The disputes that won had a single piece of paper — a terminal gate record, a chassis-availability email, a published free-time schedule, or the bill of lading itself. You do not need a logistics lawyer; you need the document that matches the defect you are claiming.
The escalation path matters too. If the carrier’s billing department stonewalls, the FMC has a formal complaint process with an online filing portal, and the agency has been aggressive since 2022 — it has ordered refunds, imposed penalties, and rewritten the billing rules. The mere mention of an FMC complaint is usually enough to get a second review from a carrier that knows the rule is now on your side. And because the FMC allows you to recover the full amount plus interest in many cases, the dispute is not a cost center — it is a revenue line.
How to Prevent the Next Demurrage Bill Before It Happens
The audit finds money; prevention keeps it. The first preventive habit is a container calendar. The moment a vessel sails, put three dates on your calendar: the free-time expiry date (from the bill of lading), the scheduled pickup date, and the return-by date. When pickup slips past the free-time date, you get an early-warning email from your forwarder — not a surprise invoice two months later. In the 2025 survey, importers who tracked container windows reported 47% fewer D&D incidents in six months.
The second habit is a chassis and gate check. Most carrier-caused delays — the ones you cannot be charged for — start with a chassis shortage or a closed gate. Before you schedule a pickup, ask the terminal for chassis availability and gate hours in writing. If the terminal says no chassis until Friday, you have the documentation that protects you from Friday’s demurrage charge. The FMC has repeatedly ruled that importers cannot be charged for days when the terminal could not deliver the equipment.
The third habit is the one that compounds everything else: put D&D recovery into your monthly logistics review. Ten minutes per invoice, the four-point checklist from earlier in this guide, and a running spreadsheet of disputes filed and refunds received. In the review data, importers who ran a monthly D&D check recovered an average of $2,300 in their first year — and 68% of them reported that their carriers’ error rates dropped after the first two disputes, because billing departments learn which accounts check their math. The money engine works best when it runs on a schedule.
Frequently Asked Questions
Q: What is the difference between demurrage and detention?
A: Demurrage is charged while your container is still at the terminal past its free time — the port charges rent for the space. Detention is charged after the container leaves the terminal and stays at your warehouse or a rail ramp past its return window — the shipping line charges for the equipment being out of circulation. They are billed by different parties, so disputes go to different departments.
Q: How much can I actually recover from demurrage and detention overcharges?
A: In a 2025 review of 210 importer container bills, 34% contained D&D errors averaging $412 per container, and 62% of documented disputes were won. On 20 containers a year, that is $2,100 to $2,600 in recoverable charges — before you negotiate longer free time, which can be worth thousands more.
Q: Can I be charged demurrage when the delay is the carrier’s fault?
A: No. The FMC is explicit that carriers and terminals cannot charge demurrage or detention for delays they cause — chassis shortages, terminal closures, equipment imbalances, or congestion events outside your control. Document the cause with a terminal email or gate record, and the charge is disputable with a high win rate.
Q: What did the 2024 FMC billing rule change?
A: The FMC’s 2024 rule requires carriers to invoice demurrage and detention within 30 days of the charge, itemize every charge with the free-time expiry date and calculation, and refund valid disputes within 30 days. Charges invoiced late or missing the required dates are non-compliant and refundable — and carriers face penalties of up to $64,000 per violation.
Q: How do I negotiate more free time with my shipping line?
A: Ask for it in your service contract: extend demurrage free time from 3 to 7 days and detention from 5 to 10 days when you consolidate volume with one forwarder. In a 2025 survey, 58% of importers who asked got at least two extra free days — and going from 3 to 7 free days on 20 containers a year is worth roughly $7,200 at typical rates.
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