Detention and Demurrage Management Goes Digital: How AI Is Recovering Billions in Hidden Freight Costs for Shippers

Every shipper who moves ocean freight knows the frustration. A container arrives at port, clears customs a day late, and suddenly there's a $300-per-day charge on the invoice that nobody budgeted for. Multiply that across hundreds or thousands of containers annually, and you're looking at a cost category that quietly bleeds millions from supply chain budgets.

Detention and demurrage (D&D) charges are the shipping industry's most expensive blind spot. According to Federal Maritime Commission (FMC) data, the nine largest ocean carriers collected roughly $15.4 billion in D&D charges between 2020 and early 2025. That's not a rounding error—it's a structural cost crisis that most shippers still manage with spreadsheets and reactive dispute processes.

But that's changing. A new generation of AI-powered D&D management platforms is giving shippers the visibility and automation they need to fight back.

The Scale of the Problem: Why D&D Charges Keep Growing

To understand why detention and demurrage costs spiral out of control, you need to understand how the charges work—and why they're so difficult to manage.

Demurrage is charged when a full import container sits inside a port terminal beyond its allotted free time, typically 3 to 5 days depending on the carrier and port. Detention kicks in when a shipper holds the carrier's empty container outside the terminal too long after unloading. Both charges accrue daily, and rates have climbed steadily—Maersk's January 2026 tariff updates reflect per diem increases across U.S. import and export lanes.

The charges themselves aren't unreasonable in theory. They exist to incentivize cargo movement and keep containers flowing through the global supply chain. The problem is how they're applied in practice:

• Fragmented free-time rules. Every carrier, port, and terminal has different free-time allowances, calculation methods, and billing cycles. A shipper moving containers through five ports on three carriers faces fifteen different rule sets.
• Unclear billing responsibility. The FMC's 2024 billing requirements rule attempted to clarify who should receive D&D invoices, but as FreightWaves reported, the D.C. Circuit Court struck down a key provision in September 2025—leaving billing responsibility in a gray zone for many shipments.
• Cascading delays outside shipper control. Port congestion, customs holds, chassis shortages, and terminal appointment backlogs all contribute to dwell time that shippers can't always prevent but still get billed for.

The result: shippers pay charges they shouldn't owe, miss dispute windows they didn't know existed, and lack the data to prevent recurring D&D exposure.

Why Traditional Freight Audit Doesn't Solve D&D

Many shippers assume their freight audit and payment (FAP) process catches D&D overcharges. It doesn't—at least not effectively.

Traditional freight audit excels at catching rate discrepancies, duplicate invoices, and accessorial mischarges on transportation invoices. But D&D management is a fundamentally different problem. It requires real-time container tracking to know when free time starts and stops, carrier tariff databases that update as rates change, and automated dispute workflows with carrier-specific deadlines and documentation requirements.

By the time a D&D charge shows up on a freight invoice, the dispute window has often already closed. Carriers typically require disputes within 30 days of invoice receipt, and some terminals impose even shorter windows. A monthly freight audit cycle running 45 to 60 days behind simply can't move fast enough.

How AI Is Transforming D&D Management

The new wave of D&D management technology tackles the problem at every stage—before, during, and after charges accrue.

Predictive Port Dwell Analytics

AI models trained on historical port performance data, vessel schedule reliability, and terminal throughput metrics can now predict D&D risk before cargo arrives. If a vessel is running three days late into a congested port, the system can flag containers likely to exceed free time and trigger pre-arrival interventions—rescheduling drayage appointments, filing for free-time extensions, or arranging alternative pickup locations.

This predictive layer is where the real savings happen. Preventing a $300-per-day charge for even one day across 500 containers means $150,000 recovered before a single invoice is generated.

Real-Time Free-Time Monitoring

Modern D&D platforms maintain live connections to terminal operating systems, carrier APIs, and port community systems to track exactly where every container sits relative to its free-time clock. When a container hits 80% of its allotted free time, automated alerts trigger the logistics team or, increasingly, initiate autonomous drayage dispatch without human intervention.

This continuous monitoring eliminates the information gap that causes most avoidable D&D charges. Shippers don't miss deadlines because they didn't know the clock was ticking.

Automated Dispute Filing and Resolution

When charges do accrue, AI-powered systems can automatically evaluate whether each charge is valid by cross-referencing carrier tariffs, terminal records, and shipment events. If the system identifies an overcharge—a container billed for demurrage during a period when the terminal gate was closed, for example—it generates a dispute package with supporting documentation and files it within the carrier's required timeframe.

Industry benchmarks suggest that 20% to 30% of D&D invoices contain disputable charges, but most shippers only contest a fraction of them because the manual effort required per dispute exceeds the charge amount. Automation flips that equation entirely.

The Regulatory Landscape: FMC and OSRA 2022

The regulatory environment is pushing the industry toward greater D&D transparency, even if progress is uneven.

The Ocean Shipping Reform Act of 2022 (OSRA 2022) mandated minimum billing information requirements for D&D invoices and directed the FMC to define reasonable billing practices. The FMC's 2024 final rule established new standards for how carriers and marine terminal operators must bill for D&D, including requirements around invoice timing, content, and the principle that charges should only apply to parties who had the ability to mitigate the delay.

While the September 2025 court decision created some regulatory uncertainty, the direction is clear: the era of opaque, unchallengeable D&D billing is ending. Shippers who invest in digital D&D management now will be best positioned to leverage these regulatory protections—because you can only exercise your rights under OSRA 2022 if you have the data to support your disputes.

Building a D&D Prevention Strategy

Technology alone doesn't solve the D&D problem. The most effective shippers combine digital tools with operational discipline:

1. Map your free-time exposure. Audit every carrier contract and terminal agreement to build a centralized database of free-time allowances, per diem rates, and dispute deadlines across your entire network.

2. Integrate drayage and terminal operations. D&D charges often result from disconnected processes—ocean freight booked by procurement, drayage managed by a separate team, and terminal appointments handled by yet another group. Tight integration between these functions eliminates handoff delays.

3. Negotiate free-time proactively. Many shippers don't realize that free-time allowances are negotiable, especially for high-volume accounts. Use your D&D data to identify ports and carriers where additional free days would have the greatest cost impact.

4. Establish pre-arrival workflows. Don't wait for the vessel to berth. Begin customs clearance, drayage scheduling, and warehouse receiving coordination while the container is still on the water.

How CXTMS Container Visibility Prevents Avoidable D&D Charges

CXTMS provides end-to-end container visibility that transforms D&D from a reactive cost center into a managed, predictable expense. Our platform integrates carrier tracking data, terminal status feeds, and customs clearance milestones into a single dashboard that monitors free-time utilization across your entire import and export portfolio.

When containers approach free-time thresholds, CXTMS triggers automated alerts and workflow actions—from drayage dispatch notifications to carrier extension requests—ensuring your team acts before charges accrue rather than disputing them after the fact.

Combined with CXTMS freight audit capabilities, shippers gain both prevention and recovery: stopping avoidable charges upstream while catching billing errors downstream.

Ready to take control of your detention and demurrage costs? Request a CXTMS demo today and see how real-time container visibility can eliminate your most frustrating hidden freight expense.