Demystifying Port Surcharges, Demurrage & Detention

One of the largest sources of friction and margin erosion in global freight operations is unexpected accessorial fees. Many commercial shippers confuse demurrage, detention, and port storage, resulting in severe tariff penalties that easily dwarf baseline ocean freight costs.

1. The Clock on Free Time Days

Every ocean carrier booking specifies a defined "free time" period—typically ranging from 3 to 14 calendar days depending on whether the cargo is standard dry van (20DV/40HC) or special equipment (reefers or flat-racks). Once free time expires, daily tariffs compound rapidly on an ascending tiered scale.

Proactive shippers negotiate extended combined demurrage/detention (D&D) periods upfront during contract placement, particularly on trade lanes with congested border clearance checkpoints.

2. Terminal Handling Charges (THC) & Bunker Adjustment Factors (BAF)

Beyond container usage penalties, baseline ocean freight quotes are shaped by auxiliary port items:

• Origin & Destination THC: Covers the physical lifting, yard transfer, and gantry crane operations required to move containers between terminal stacks and the vessel hold.
• Bunker Adjustment Factor (BAF): Floating quarterly surcharge that hedges maritime fuel cost fluctuations (VLSFO / MGO compliance).
• ISPS & Port Security Surcharges: Regulatory compliance fees levied for international vessel and port facility security verification.

3. Practical Mitigation Strategies

To safeguard your supply chain budget, RAIVEGA applies four operational controls:

• Pre-clearing customs entries prior to container vessel berthing.
• Securing confirmed empty return container drop-off appointment slots at destination depots.
• Deploying digital milestone triggers that alert consignees 72 hours and 24 hours before free-time expiration.
• Auditing line invoices against agreed rate cards to catch wrongful demurrage billing.