When importing a roll forming machine, the biggest financial risk at port is often not duty, freight, or VAT.
It is demurrage and detention.
Five to seven extra days at port can add thousands in unexpected costs — especially for heavy industrial equipment.
This guide explains:
What demurrage really is
What detention really is
Free time explained
Who pays under different Incoterms
How to prevent charges
A practical 7-day rescue plan if your shipment is stuck
Demurrage is a charge applied by the shipping line when a container remains at the port terminal beyond the allowed free time.
It applies before the container leaves the port.
In simple terms:
Container arrives
Free time starts
If not collected in time → demurrage begins
Demurrage is charged per day and increases progressively in many ports.
Detention is charged when the container has left the port but is not returned to the designated depot within the allowed time.
It applies after the container leaves the port.
In simple terms:
Container picked up
Free time starts
If not returned in time → detention begins
For roll forming machines, unloading delays often trigger detention.
Port storage is different again.
It is charged by the terminal operator (not the shipping line) when the container stays in the yard beyond free days.
In many cases, you can face:
Demurrage
Port storage
At the same time.
Free time is the number of days allowed without charges.
It varies by:
Port
Shipping line
Contract
Season
Incoterm
Typical free time ranges:
3–7 days at port
3–10 days for container return
Always confirm free time before shipment arrives.
Roll forming lines are:
Heavy
Complex
Sometimes inspected
Sometimes require special trucking
Sometimes require crane scheduling
If customs clearance or unloading is delayed, charges escalate quickly.
Responsibility depends on Incoterm.
Buyer typically responsible.
Seller handles transport to site, but buyer may still face customs delays.
Seller usually responsible.
Always confirm in contract who pays.
Charges often increase per day.
Example structure:
Days 1–5: Free
Days 6–10: $150/day
Days 11–15: $250/day
After day 15: $400/day
Heavy machinery delays can quickly exceed $3,000–$5,000.
Customs entry not filed in advance
Incorrect paperwork
HS code disputes
VAT payment delays
Importer registration issues
Inspection holds
No truck booked
Factory not ready to receive
Crane not scheduled
Container cannot access site
Most of these are preventable.
✔ Submit customs documents before vessel arrival
✔ Confirm HS classification early
✔ Arrange VAT/duty payment in advance
✔ Pre-book trucking
✔ Pre-book crane
✔ Confirm factory access
✔ Confirm unloading equipment
✔ Track vessel ETA daily
✔ Confirm container return location
Preparation is everything.
Before vessel arrival:
5–7 days prior:
Send documents to broker
Confirm duty estimate
Confirm payment method
2–3 days prior:
Confirm trucking availability
Confirm unloading crew
Arrival day:
Confirm customs entry submitted
If your container is approaching free time expiry, act immediately.
Determine:
Customs issue?
Payment issue?
Inspection delay?
Trucking delay?
Call broker and forwarder directly.
Contact customs supervisor if needed
Provide any additional documents immediately
Confirm inspection schedule
Speed matters.
If duty/VAT unpaid:
Arrange immediate transfer
Use urgent bank channel
Provide proof of payment to broker
Even if clearance pending:
Secure trucking slot
Prepare factory access
Confirm crane availability
Be ready to collect immediately after release.
If delay caused by:
Port congestion
Customs hold beyond your control
Forwarder may request free time extension.
Not guaranteed — but sometimes possible.
If inspection ongoing:
Request partial release if possible
Confirm earliest pickup window
Confirm container return depot
Once cleared:
Collect same day if possible
Unload promptly
Return container immediately
Do not wait another day.
After unloading:
Confirm exact return depot location
Confirm return hours
Remove all packaging debris
Sweep container clean
Remove nails and screws
Photograph container condition
Rejected container returns cause extra charges.
Vessel arrival earlier than expected
Public holiday delays
Weekend limited operations
Incorrect consignee name
Bank transfer delays
Import license issues
Monitor shipment closely.
Add contingency of:
$1,000–$3,000 buffer
Especially for:
First-time imports
Used machinery
Oversized lines
High-congestion ports
Better to budget for it than panic later.
Demurrage and detention are:
Time-based penalties
Predictable
Avoidable with preparation
They are often the largest unexpected cost in machinery imports.
Control paperwork
Control timing
Control unloading
And you control demurrage.
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