In November 2019, Zhou Min, a documentation supervisor at an auto-parts exporter in Beilun, Ningbo, took a call from a liner agency. Three 40-foot high cubes shipped to Karachi in late September had been sitting in the terminal for 26 days. The storage and container detention charges came to USD 18,700. The customs value of all three containers was USD 71,000. Zhou Min spread the bill of lading, the customs declaration and the certificate of origin across the meeting table that afternoon and found the problem in ten minutes: the B/L described the cargo as "Auto Spare Parts" while the customs declaration broke it down to a specific tariff line, "Brake Pads". The wording did not match. The customs broker at the destination refused to release, the consignee would not lift the boxes, and the carrier kept the meter running at USD 80 to 120 per container per day. The shipment lost money, and the loss wiped out the entire gross margin. The expensive part of demurrage is never the dollars on the invoice. It is the twenty-odd days when information is stuck and nobody wants to move first.
What follows is the field version: how the two charges differ, how to negotiate free time, how to pre-audit documents, how the daily rate climbs, how to ask for a waiver once the charges already exist, and who actually pays under FOB and CIF.
Demurrage vs Detention: One Line Decides Everything
The single biggest cause of disputes in this business is that both words get translated into one local term meaning "overstay fee". There is only one dividing line: has the container left the terminal?
- Demurrage: the container is still inside the terminal or depot beyond the free storage days granted by the carrier. It is occupying terminal yard space.
- Detention: the container has been picked up, possibly already stripped, but the empty has not been returned to the carrier's designated depot within the agreed days. It is occupying the carrier's equipment pool.
The switch happens at two events: gate-out and empty return. On the import side, Demurrage runs first; once the box is gated out, Demurrage stops and Detention starts. On the export side the order reverses: storage at origin follows Demurrage logic, and Detention is counted at destination after discharge.
That distinction decides who you call. Demurrage involves both the terminal and the carrier, and the terminal operations desk is usually the key counterparty; Detention is purely a carrier matter, and the equipment control department owns it. Email the wrong desk ten times and nobody answers. To work out which phase you are in, compare the gate-out timestamp on the equipment interchange receipt with the timestamp on your empty-return booking confirmation.
On liability, Demurrage normally sits with the consignee or its forwarder, because the act of collection belongs to the consignee. Detention depends on who controls the box; contract wording commonly pins the overstay charge "from the date of equipment pick-up to the date of empty return" to the buyer. Never use one generic phrase for both in a contract. Once a dispute starts, each side reads the clause its own way and the only resolution left is litigation.
Free Time Is Negotiated, Not Granted
Free time is not a fixed standard. It is an outcome of the booking negotiation. Baseline allowances on most trades sit in this range: 5 to 7 free days at the terminal and 4 to 7 free days for equipment use. Established trades such as North Europe, the US West Coast, Japan and Korea are usually more generous; Africa, the East Coast of South America and parts of the Middle East are tighter. In peak season, which means the August-to-October US and Europe restocking push and the pre-Spring-Festival rush, the base allowance is often cut to 3 or 4 days.
There are three ways to push free time up, and all of them work before the cargo sails.
- Ask at booking, not after loading. Free time is a tariff term. It can be written into the booking confirmation or the rate agreement (FAK or NAC quotation) as "7 days free demurrage, 7 days free detention". A shipper moving several hundred containers a year routinely gets 10 to 14 days.
- Get it in writing. Send an email stating "please extend free time to X days at POL and POD" and keep the reply from sales or customer service. A verbal yes disappears at the destination port.
- Apply for destination free time separately. A concession at origin does not automatically extend to the destination. If the consignee clears slowly, have them apply directly to the local carrier agency, which is usually faster than an application routed back through China.
Complaining about shorter free time in peak season gets you nowhere. Space is tight, the carrier needs equipment to keep turning, and the allowance narrows on its own. The answer is to book three to four weeks earlier and get the free-time terms into the confirmation. If your buyer is a supermarket chain or a distributor, have them confirm an expected collection date at the purchase-order stage and submit the paperwork for an extension together with the booking.
One detail gets missed constantly: are free days calendar days or working days? Ports in the Middle East and parts of Africa close on Friday and Saturday. Counted in working days, you get meaningfully more real time; counted in calendar days, their weekend burns your money as fast as any other day. Settle this in the order negotiation and write it into the agreement.
The Four Usual Triggers, From Paperwork to a Stalled Port
Containers rarely sit in the yard because the owner decided not to collect them. They sit because something blocked them. Across the files we handle, the causes cluster into four groups.
Document mismatches. The description, package count, gross and net weight or container number on the bill of lading does not match the customs declaration or the certificate of origin (CO, Form A, RCEP certificate). Zhou Min's shipment was a description problem. Another frequent failure is a consignee name spelled differently from the name registered with the destination customs authority, or a B/L clause that contradicts another document under a letter of credit, which makes the bank refuse the documents, the buyer hold payment and the broker hold the boxes.
Incomplete clearance files. Destination countries that require an import permit or a pre-shipment conformity certificate, such as SONCAP for Nigeria, SABER for Saudi Arabia, PVoC for Kenya, stall for a day for every missing document. Perishables carry a second risk: if inspection drags, the cargo itself is ruined.
A slow consignee. The buyer is waiting on a letter of credit, on funding, on a downstream payment, or is simply stalling in the hope the seller will discount. This spikes when the buyer's cash flow is under pressure.
No one collecting, and events outside the port. The consignee is insolvent or has gone silent, or the destination is hit by a strike, congestion, a terminal system failure or extreme weather. When the terminal jams, the carrier still bills by the day and does not care whose fault it is.
Of the four, the first two are within the shipper's control. The last two can only be hedged with contract terms and insurance.
How the Charges Are Built: Tiers and Why Waiting Costs More
Carrier pricing almost always follows a free period plus tiered rates structure rather than a flat line. Tiering means the first overstay days are cheap and the rate climbs from there, with many contracts setting three bands at 30, 60 and 90 days. The design intent is blunt: get the box back.
On magnitudes, and stripped of any specific carrier's tariff: a 20-foot container might bill at USD 30 to 50 per day for the first five days past free time, then move to USD 80 to 110 per day in the second band, and continue rising past a month. A 40-foot high cube typically runs 30 to 60 percent above the 20-foot rate. The practical consequence is that the first ten days and the last ten days of a 30-day overstay cost wildly different amounts. Zhou Min's three high cubes billed USD 18,700 over 26 days, roughly USD 240 per container per day, because they had already crossed two bands.
Three more charges get overlooked:
- Terminal storage and Demurrage are separate invoices. Store rent is billed by the terminal; Demurrage is billed by the carrier. At some ports the terminal charge is the larger number.
- Detention is banded by equipment type. Dry boxes are cheapest. Reefers, open-tops and flat racks are scarce, and the rate can multiply.
- Truck waiting time and container damage. A truck waiting at the factory gate for a day is money, and a hole punched by a forklift is a repair invoice.
To get real numbers, the only reliable route is to ask for the applicable tariff sheet and have your agent spell out the daily rate, the band thresholds, and the exact trigger for the free period: does it start at vessel arrival, at completion of discharge, or at the free-time start date? The trigger is one of the most contested points in the whole process and can move the clock by two or three days.
Prevention: Move Every Action Ahead of Loading
The best way to handle demurrage is to stop it happening. Four actions, ranked by payoff:
Lock free time at booking. Put it in the booking confirmation and the rate agreement, apply separately at destination, and negotiate longer terms if you move volume. This costs nothing and returns the most.
Pre-audit the documents. Three days before loading, run a cross-check across the draft bill of lading, the customs declaration, the packing list, the invoice, the certificate of origin and the letter of credit. Compare six fields line by line: description, HS code, package count, weight, consignee name and address, container number. Have the customer sign and return the B/L confirmation draft and keep the email on file.
Put a collection deadline in the sales contract. Add: "the buyer shall complete collection within X working days of arrival; storage, demurrage and detention arising from the buyer's delay shall be borne by the buyer." X is usually 5 to 7 working days, and the clause should state how the arrival notice is served. This clause is the handle for every later dispute.
Does insurance cover it? Ordinary marine cargo cover under the ICC (A), (B) or (C) clauses does not cover demurrage or detention. It responds to physical loss of or damage to the cargo. To hedge these charges you need a specific delay or demurrage extension, or credit insurance covering the receivable risk when a buyer fails to collect. Check the deductible and the exclusions first. Many extensions exclude "buyer's own cause", which makes the cover worthless for exactly the scenario you were worried about. On small orders the premium can also outweigh the exposure, so run the arithmetic.
Charges Already Raised: How to Make a Waiver Request Land
An invoice in hand does not mean you owe all of it. Carriers do grant waivers where the reason is defensible. The two variables that matter are evidence and timing.
Ask immediately. Submit as soon as the charge notice arrives, not when the invoice falls due. While the charge is still live in the carrier's system there is room; once it moves to collections or legal, that room shrinks fast.
Evidence that it was not your fault. Typical bundles include: a port authority or terminal notice of strike, congestion or system failure; a destination customs inspection order or a record of delayed release; the email trail with the consignee's broker; the signed B/L confirmation showing documents were agreed before loading; the customs examination attendance slip. The dates on the evidence have to line up with the charge period.
Your leverage. There are four cards: volume, meaning next year's two or three hundred containers and a request to help on this one; proof that part of the delay came from the terminal or the carrier, for example slow discharge, slow release or a system outage; a clean record paired with a written commitment to tighten procedures; and gate-out timestamps showing shared responsibility. Put those into one short opening paragraph. It works far better than a long account of hardship.
Get the outcome in writing. The amount waived, the payment deadline and how the balance is settled should be confirmed by email from the account manager. If you agree an instalment plan, put that in writing too. Never accept a verbal "pay first, we refund later". Getting money back is ten times harder than never paying it.
If the delay was genuinely the buyer's doing but the consignee refuses to pay at destination, run both tracks at once: apply to the carrier for a waiver to shrink the base, and issue a claim against the buyer under the contract for the rest. The two do not conflict.
Who Pays: FOB, CIF and the Wording That Settles It
The governing principle is one sentence: whoever caused it pays. Applying that to Incoterms is where it gets messy.
- FOB. The buyer books and pays the freight, so destination Demurrage and Detention sit with the buyer in principle. The exposure appears when the buyer nominates a forwarder but the seller books directly with the carrier: the seller negotiated the free time, so the allocation of blame depends entirely on the contract. Many disputes live in exactly this grey zone, where the booking sits with one party and the document instructions come from the other.
- CIF and CFR. The seller pays freight and arranges carriage, but the physical act of collection at destination still belongs to the buyer. Demurrage therefore remains a buyer cost, yet the carrier will chase the booking party, which is the seller. To pass the charge back, the seller needs the contract clause and a clean endorsement chain on the bill of lading.
- EXW and DDP. Under DDP the seller carries destination charges and clearance, so the overstay risk is almost entirely the seller's. Price it into the quotation.
Keep the contract clause short and give it teeth: "Upon arrival at destination, the buyer shall complete collection and return the empty container within the carrier's free time or within 7 working days of the arrival notice. Storage, demurrage, detention and other ancillary charges arising from the buyer's failure to collect on time, to return the empty on time or to provide clearance documents in time shall be borne by the buyer and may be deducted directly from any unpaid balance." A set-off right is worth far more than a claim after the fact. If payment runs under a letter of credit, check that the clause does not clash with the B/L terms or the bank will find the discrepancy.
Case Review: How Two Charges Ate an Entire Gross Margin
Back to Zhou Min's file. The numbers tell the story better than any argument.
Three 40-foot high cubes, customs value USD 71,000. At the industry-typical gross margin of 12 to 15 percent, the whole order carried USD 8,500 to 10,600 of gross profit. Twenty-six days of overstay at destination produced a combined storage and detention invoice of USD 18,700, roughly twice the gross profit. The final negotiation waived USD 4,200, leaving USD 14,500 to pay. The order lost money, somewhere around USD 4,000, before counting two months of chasing and email traffic.
Trace the chain and three links failed. First, no one cross-checked the description between the draft bill of lading and the customs declaration before loading; the documentation clerk copied the generic name off the customer's purchase order. Second, free time was never specifically applied for at booking, so destination granted only 5 free storage days. Third, the buyer took 9 days at destination to confirm a customs broker, citing internal approval. The seller could control the first two. The third is exactly what a contract clause is for.
The fixes came afterwards. Description standards went into the documentation SOP, and the B/L draft now requires dual sign-off against the customs declaration. Bookings now carry a standard request for 7 free demurrage days and 7 free detention days. The sales contract template gained the 7-working-day collection deadline and the set-off clause. All three changes cost a few hours of labour. What they protect is the entire margin on every future order.
Demurrage and detention are not really a logistics cost problem. They are a document and information flow problem. During the twenty-odd days a container sits in the yard, the shipper, the forwarder, the carrier, the terminal and the broker are all waiting for someone else to move first. Whoever nails the description before loading, locks free time at booking and writes liability into the contract never has to wait.
Frequently Asked Questions
What is the core difference between demurrage and detention?
Whether the container has left the terminal. Demurrage applies while the box is still inside the terminal or depot past its free storage days, occupying yard space. Detention applies once the box has been picked up but the empty is not returned to the carrier within the agreed days, occupying the carrier's equipment pool. On imports demurrage runs first, stops at gate-out, and detention starts.
How do you negotiate free time, and why does it shrink in peak season?
Request it at booking and get it written into the booking confirmation or the rate agreement. Typical baselines are 5 to 7 free storage days and 4 to 7 free equipment days, with volume shippers negotiating 10 to 14. In peak season space and equipment are tight, the carrier protects container turnaround and the base allowance is cut to 3 or 4 days. Book three to four weeks earlier and lock the terms in writing.
If the charges have already been raised, how do we ask for a waiver?
Submit as soon as the charge notice arrives, not when the invoice falls due. Attach evidence that the delay was not caused by you: a port strike or congestion notice, a destination customs inspection order, the broker email trail, or the signed bill of lading confirmation showing documents were agreed before loading. Leverage comes from volume, shared fault by the terminal or carrier, and a clean record with a written commitment on process. Always get the waived amount and payment deadline confirmed by email.
Under FOB and CIF, who actually pays destination demurrage?
Whoever caused it. Under FOB the buyer books and pays freight, so destination demurrage and detention fall to the buyer in principle. Under CIF or CFR the seller books and pays freight, so the carrier may chase the seller first and the seller must recover from the buyer using contract wording and the endorsement chain. Write the collection deadline, the allocation of charges and a right of set-off against unpaid balances into the contract.