Savannah freight accessorial charges to watch

Executive Summary

Savannah's freight bills carry a layer of port-driven charges that an inland manufacturing site never sees: chassis rental, container detention, and per-diem on a container held past its free days. Each has a separate trigger, a separate contract or tariff line, and a separate clock, and the invoice rarely shows the clock. The mechanism that produces drift here is the same one that produces it everywhere: a charge with a condition attached, billed as if the condition were always met.

Fuel is the second Savannah-specific pressure point. The US EIA and BLS both show large year-over-year movement in the inputs that feed a fuel surcharge table, so a surcharge schedule set months ago is now working against a materially different cost base, in either direction. A schedule that has not been re-checked against current published figures is a schedule that may be over- or undercharging on every load.

Third, Savannah's carrier mix runs through drayage providers and rail ramps that inland lanes do not use, which multiplies the accessorial types on a single invoice and multiplies the number of tariff documents an AP reviewer would need to hold open to check any one of them.

1. What is different about freight billing in Savannah?

Savannah is a container port market, so its freight invoices carry charges an inland manufacturing lane never generates: chassis rental, container detention, and per-diem tied to how long a container sits before it is returned. Each charge has its own contract or tariff reference and its own clock that starts at a different event than the pickup date on the bill of lading, which is what makes the invoice line alone insufficient to validate the charge.

An inland freight invoice is mostly linehaul plus a fuel surcharge plus a handful of standard accessorials: liftgate, residential, redelivery. A Savannah drayage invoice adds a layer tied to the container itself, not the shipment.

Chassis rental accrues by the day the chassis is attached to the container, whether or not the container is moving. Detention accrues once a container sits at a facility past its free time, and per-diem accrues once the empty container is not returned to the port or rail ramp by the line's cutoff. None of these clocks appear on the invoice as a start and stop date; they appear as a single line item with a dollar figure.

A rate card only covers linehaul and standard accessorials in most freight contracts. Chassis and detention terms often live in a separate drayage agreement or the ocean carrier's own tariff, which is why they are the charges most likely to be paid without a matching reference document on file.

2. How does the current fuel cost environment affect a Savannah surcharge table?

The US EIA and BLS diesel and fuel indices both show sharp year-over-year movement as of mid-2026, which means a fuel surcharge schedule negotiated even a few months earlier is now calculated against an input cost that has moved materially. A surcharge table that has not been re-benchmarked against a current published index is charging, or crediting, against a number that no longer reflects the market it was built for.

The BLS Producer Price Index for gasoline, series WPU0571, read September 6, 2026, put the July 2026 index at 302.759, up 37.1% year over year. The BLS Producer Price Index for truck transportation of freight, series WPU3012, read the same date, put the July 2026 index at 170.984, up 10.9% year over year. The BLS industry index for general freight trucking, long-distance truckload, series PCU484121484121, read the same date, put July 2026 at 195.575, up 8.1% year over year.

These three series move independently. A surcharge table indexed to a stale diesel reference, rather than a current published one, drifts from actual input cost in whichever direction the underlying index has moved since the table was set.

For Savannah specifically, this matters more than in an inland lane because drayage moves are short-haul and fuel-surcharge-sensitive on a per-mile basis, so a stale index has more relative effect on a drayage leg than on a long linehaul move where fuel is a smaller share of total cost.

3. Which container-related charges need their own reference document?

Detention, per-diem, and chassis rental each need a document beyond the freight rate card: a facility appointment log, a rail ramp release notice, or the drayage carrier's own chassis tariff. Without one of these, an AP reviewer has no way to confirm the invoice's stated number of days against the actual date the container arrived, was released, or was returned, and the charge is effectively unverifiable from the invoice alone.

Each container charge runs on its own clock, set by a different party than the one issuing the invoice, which is why a single rate card cannot validate all three.

Detention needs the facility's gate-in and gate-out timestamps to confirm the free-time window was actually exceeded, not assumed. Per-diem needs the steamship line's empty-return cutoff and the terminal receipt showing when the empty container was actually dropped. Chassis rental needs the chassis provider's own daily rate and pool agreement, since this fee often runs on a separate account from the drayage carrier's invoice.

The fuel surcharge itself needs the index and formula stated in the contract, checked against a current published figure rather than the carrier's own stated adjustment.

Without the matching document, each of these charges is arithmetically unverifiable, whatever the invoice states.

• Detention: Needs the facility's gate-in and gate-out timestamps to confirm the free-time window was actually exceeded, not assumed.
• Per-diem: Needs the steamship line's empty-return cutoff and the terminal receipt showing when the empty container was actually dropped.
• Chassis rental: Needs the chassis provider's own daily rate and the pool agreement, since this fee often runs on a separate account from the drayage carrier's invoice.
• Fuel surcharge: Needs the index and formula stated in the contract, checked against a current published figure rather than the carrier's own stated adjustment.

4. Can a rate card audit catch drayage-specific overbilling?

A standard rate card audit checks linehaul rates and named accessorials against a contract, but chassis and detention terms frequently sit outside that rate card entirely, in a separate drayage agreement or a carrier tariff referenced only by name. A rate card audit that does not pull those separate documents will pass a detention or chassis charge as valid simply because no contradicting line exists in the document it checked against.

This is a scope problem, not a diligence problem. The rate card audit process described in the freight and 3PL invoice audit guide checks an invoice line against a negotiated rate table. That process works correctly for linehaul, standard accessorials, and named fuel surcharge formulas.

It does not, by itself, reach a chassis pool agreement or a steamship line's detention tariff, because those documents are not part of the freight rate card. They are separate contracts, sometimes held by a different vendor entirely from the one issuing the drayage invoice.

A complete Savannah freight audit therefore needs the rate card check plus a second pass that pulls the chassis and detention references specifically, and confirms each charge against its own document rather than assuming the rate card audit already covered it.

5. Does port congestion change what an accessorial audit should look for?

Congestion at a port terminal extends the time a container sits before pickup or return, which increases the raw count of detention and per-diem charges an invoice can generate, without changing whether any individual charge is billed correctly. The audit question stays the same regardless of congestion: did the stated free-time window actually run out, and does the invoice's day count match the terminal's own gate records.

Congestion changes volume, not method. When turnaround at a terminal slows, more containers cross the free-time threshold and more detention and per-diem lines appear on the monthly bill. That is a real cost increase tied to conditions outside the shipper's control.

What congestion does not do is change the audit question. A detention charge is either correctly calculated against the terminal's own gate-in and gate-out record, or it is not. A higher volume of these charges during a congested period makes checking each one more valuable, not less, because the dollar exposure per invoice goes up at the same time the charge count goes up.

An AP process built to spot-check occasional detention lines will fall behind during a congestion period specifically because volume rose. That is the point at which a full line-by-line review, rather than a sample, earns its cost.

6. Should a Savannah-based shipper renegotiate the fuel surcharge index?

Whether to renegotiate depends on which index the current contract references and how far that index has moved from a current published figure, not on a general sense that fuel costs are high. A contract tied to a diesel or gasoline index that has moved 37.1% year over year, per BLS series WPU0571 read September 6, 2026, is worth checking against the contract's stated formula before assuming the surcharge line is calculating correctly.

The decision is arithmetic, not sentiment. Pull the contract's stated fuel surcharge formula and the index it references. Compare that index's current published value to the value it held when the contract was signed or last adjusted.

If the referenced index has moved in line with the BLS series cited above, the surcharge is likely tracking correctly and renegotiation is not the issue, verification is. If the contract references a different or proprietary index that has not moved the same way, the surcharge may be systematically over- or undercharging relative to the shipper's actual fuel exposure.

This is worth doing per lane, not once for the whole freight spend, because Savannah drayage and any inland linehaul moves in the same freight budget can reference entirely different surcharge formulas with different sensitivity to the same underlying fuel cost movement.

For the wider pattern this sits inside, start with the margin drift guide.

7. Frequently Asked Questions (People Also Ask)

What accessorial charges are specific to Savannah freight that I would not see on an inland lane?

Chassis rental, container detention, and per-diem on a container held past its free-return window are specific to a port drayage move. These are billed against the container and the terminal or rail ramp's own clock, not against the shipment the way a standard accessorial like liftgate or redelivery is.

Where do detention and per-diem terms actually live if not in the freight rate card?

Usually in a separate drayage agreement or in the steamship line's own tariff, referenced by name rather than reproduced in the freight contract. That is why a rate card audit alone often does not catch an incorrect detention or per-diem charge.

How do I know if a fuel surcharge schedule is still accurate?

Check the index named in the contract's surcharge formula against a current published figure for that same index, and note the read date. The BLS Producer Price Index for gasoline (WPU0571) showed a 37.1% year-over-year move as of the July 2026 reading, read September 6, 2026, which shows how far a stale schedule can drift from present conditions.

Does a general freight and 3PL invoice audit already cover Savannah's port-specific charges?

It covers linehaul rates and standard named accessorials against the freight contract. It does not automatically reach chassis pool agreements or a steamship line's detention tariff, which sit outside the rate card and need their own document pull.

Why does port congestion increase freight audit workload even if nothing is billed incorrectly?

Congestion extends the time containers sit before pickup or return, which raises the number of detention and per-diem charges generated, independent of whether each one is calculated correctly. More charges at higher dollar exposure make full review more valuable during a congested period.

Is chassis rental billed by the drayage carrier or a separate vendor?

It depends on the arrangement, but chassis rental frequently runs through a separate chassis pool provider on its own account, even when the drayage carrier issues the primary invoice. Confirming which entity actually owns the chassis charge is a necessary first step before validating the rate.

What documents does an AP reviewer need on file to validate a detention charge?

The facility's gate-in and gate-out timestamps for the container, plus the contract or tariff stating the free-time window. Without both, the invoice's stated day count cannot be checked against what actually happened at the terminal.

Should I renegotiate my fuel surcharge contract because of current fuel prices?

Only after checking whether the index your contract references has moved in line with current published data. If it has, the surcharge is likely tracking correctly and the issue is verification, not the contract terms themselves.