Why Your LTL Costs Rose While Your Volume Didn’t

The Short Version

• Shipment count and freight spend stopped moving together. The TD Cowen/AFS Freight Index puts LTL cost per shipment more than 40% above January 2018 levels continuously since Q2 2022, while weight per shipment fell 20% over the same interval.
• Six mechanisms can raise an LTL invoice with no change in what you shipped: how your freight is classified, the annual rate increase, shipment density, accessorial growth, correction fees, and fuel surcharge tables.
• They stack, they arrive on one invoice with no breakdown, and only one of the six is something most shippers actively manage.
• “Volume was flat” usually means shipment count or units sold. Carriers price on density and cube. Those three can move in opposite directions in the same year.
• For shippers moving into big-box retail, one execution failure often bills twice: a carrier accessorial and a retailer chargeback, booked to two different departments.
• An unattributed increase is an unnegotiable increase, and it becomes permanent the moment it is absorbed into next year’s baseline.

Five Numbers that Settle the Argument

If your team can produce all five, you know what happened to your freight spend. If two or more come back as estimates, the increase is currently unattributed.

Your cost per shipment, this year versus last. Total LTL spend divided by shipment count, both years. This single ratio separates a volume story from a pricing story.

Your average density, this year versus last. Total weight divided by total cubic feet. Under density-based classification this is a price input, not a warehouse statistic.

Your reclassification and reweigh rate. Corrected shipments as a percentage of total, plus the average dollar difference per correction. Fees are the small half; the rate difference is the large half.

Your accessorial share of spend, by charge code. Not “accessorials” as one line. Detention behaves nothing like a liftgate fee, and they have different fixes.

The rate increase you actually paid. Not the percentage the carrier announced. The realized change on your top 20 lanes.

Why “Flat Volume” and “Flat Cost” Stopped Matching

Freight spend is two numbers multiplied together: how many shipments you moved, and what each one cost. When a shipper says volume was flat, they almost always mean the first. Every mechanism below lives in the second.

Rates set records while demand fell. This could be attributed to carriers having resisted the urge to “buy” freight volume via pricing concessions which held price through network efficiency and revenue management rather than responding to demand.

For a shipper, the practical consequence is that the historical relationship between your volume and your spend no longer forecasts anything. The same freight costs more.

The Six Mechanisms

Ranked by how much damage they typically do to a flat-volume program.

1. Your freight is classified differently than it was

How does freight classification affect LTL cost?

Freight class sets the rate you pay per hundredweight. Two shipments of identical weight moving the same lane can price very differently because they carry different classes. Classification is a price input you declare at tender, and the rules governing it are written by a third party rather than by you or your carrier.

Those rules change on a docket cycle, and the current cycle moved classification away from commodity descriptions and toward density. The National Motor Freight Traffic Association’s Docket 2025-1 took effect July 19, 2025, consolidating roughly 2,000 commodity listings and replacing the previous 11-tier density scale with a 13-subprovision scale that added classes 50 and 55 at the dense end. Docket 2025-2 took effect December 6, 2025, and Docket 2026-1 took effect May 23, 2026.

The direction of travel matters more than any individual docket. Under a density scale, denser freight gets cheaper and lighter freight gets more expensive. Every revision in this cycle has pushed further that way, so a shipper moving bulky, light product should expect classification to keep working against them rather than settle.

Three ways your class changes without you changing anything:

The third is more common than the industry expected. Transport Topics reported that shippers lack the latest education as it relates to LTL on bill of lading completion and freight description. Roughly 15% of a carrier’s bills of lading are still handwritten.

2. The rate increase you were quoted is not the rate increase you paid

What is an LTL general rate increase?

A general rate increase is an annual, carrier-wide percentage adjustment to base rates in a carrier’s tariff. Announced GRIs across LTL carriers have run in the mid-single digits in recent cycles. Old Dominion’s, as a documented example, was 4.9% applied to its 559, 670, and 550 tariffs effective November 3, 2025.

A GRI is a weighted average across a carrier’s entire rate structure, and it is not distributed evenly. Carriers apply more to lanes and weight breaks where they hold pricing power and less where they do not, so a mid-single-digit announcement can land as 2% on one lane and 9% on another. If your freight concentrates in the lanes a carrier wants to reprice, your realized increase exceeds the headline.

Calculate the realized increase per lane on your top 20 by spend. The gap between announced and realized is the most straightforward item on this list to raise in a negotiation, because the carrier’s own tariff documents it.

3. Your freight got lighter, so your cost per pound rose

This is where the AFS divergence becomes a shipper problem rather than an industry statistic. Weight per shipment fell 20% across the AFS book while cost per shipment stayed 40% above baseline.

Lighter shipments at constant cube means lower density. Under density-based classification, lower density means a higher class, and a higher class means a higher rate per hundredweight. You pay more per pound to move less weight. Bulky palletized product such as appliances, cased goods with protective packaging, and anything shipped with void fill sits closest to the tier boundaries, where a small density change moves the class.

The causes are usually internal and rarely visible to transportation:

None of these register as a freight decision. All of them change your freight price. Track total weight divided by total cubic feet as a monthly operating metric, alongside cost per shipment.

4. Accessorials grew faster than linehaul, and the rules moved

What are accessorial charges?

Accessorial charges are fees a carrier adds beyond the base rate for anything outside standard dock-to-dock service: liftgate, residential and limited-access delivery, inside delivery, redelivery, appointment scheduling, detention, and excessive length. They are billed after the shipment moves and are excluded from rate quotes by definition.

AFS Logistics’ analysis of roughly $1.2 billion in annual LTL spend found accessorials averaged 6.1% of total LTL spend across 2016-2021, rising to 8.7% in 2023. For shippers with heavy service requirements and no mitigation program, they can reach 20%.

The governing document is the carrier’s rules tariff, and it has grown. AFS notes rules tariffs that once ran one or two pages now run at least 70. Carriers revise them on their own schedule, and a revision can change a fee you never negotiated and were never notified about. Individual charges move sharply: AFS logged excessive-length charges (over 16 feet) reaching $4,900 per shipment at the high end, a $4,400 increase from early 2023.

Two features make accessorials specifically dangerous to a flat-volume budget. Exposure scales with shipment count rather than weight, so splitting the same freight across more shipments multiplies it. And almost nobody reads the rules tariff, which means the fee schedule you are billed against is not the one you think you agreed to.

Retail freight compounds this. Routing guide requirements dictate appointment windows, delivery method, labelling and must-arrive-by dates, and a single violation usually produces two charges from one root cause: an appointment or redelivery accessorial from the carrier, and a retailer chargeback deducted from your invoice. The chargeback frequently books to sales deductions rather than transportation, so the freight budget never sees a cost its own execution caused.

5. Correction fees became enforcement

What is the difference between reclassification and reweigh?

A reclassification charge applies when the freight class on the bill of lading does not match what the carrier determines the freight is. A reweigh charge applies when scale weight differs from declared weight beyond carrier tolerance, commonly 200 pounds or 5%, whichever is smaller. Both carry a fee plus the rate difference between what you were billed and what the corrected figure produces. The rate difference is usually much larger than the fee.

Density-based classification made these charges systematic rather than occasional. When class depended on a commodity description, verifying it meant interpreting a listing. When class depends on density, verifying it means measuring a pallet, which terminal dimensioners do automatically, at scale, on freight that is already stopped. Retailers check the same pallets at receiving against their own specifications for height, overhang and labelling, so a pallet built wrong can draw a reweigh from the carrier and a compliance deduction from the retailer.

Correction volume tracks shipment count. A data-quality problem that produced a tolerable number of corrections at 800 shipments a month produces a budget problem at 1,100, from the same underlying cause.

Getting class, dimensions, and declared weight right at tender is the cheapest freight cost reduction available to any shipper. It requires no negotiation and no carrier concession, only accurate dimensions in the shipment record before tender, which is the capability many mid-market operations have not built.

6. Fuel surcharge tables, not fuel prices

Fuel surcharges are set by a carrier’s own published table, indexed to the DOE national average diesel price. The table is a carrier document, and carriers revise the brackets. A revised table produces a higher surcharge at an unchanged diesel price.

Pull the surcharge percentage you were billed and the DOE average for the same week, across 24 months. If the relationship drifted, the table changed. This is small relative to classification, and it is the easiest of the six to prove.

Why the Increase Has to be Attributed

Six mechanisms, one invoice, no breakdown. The practical consequence is that most shippers can describe an increase but not decompose it, and that has two costs.

An unattributed increase is unnegotiable. Carriers respond to documented incidence, lane by lane and charge code by charge code. They do not respond to the observation that rates went up. Every one of the six mechanisms has a different counterparty and a different argument, and you cannot make any of them from a total.

An unattributed increase becomes permanent. Absorbed into next year’s baseline, it stops being a variance and becomes the new normal, which is how a preventable data-quality problem turns into a structural cost line that nobody revisits.

The asymmetry worth noticing is that the general rate increase, the one mechanism most transportation teams actively manage, is one of six. The other five sit in classification, corrections, surcharge tables, and fee schedules that were never negotiated by anyone. It is also worth noticing who explains them. Most of what shippers read about classification changes and accessorial charges is published by the carriers and brokers who send the invoice. Separating the six requires charge-code-level invoice data that most shippers do not routinely capture, reviewed by someone whose interest is the shipper’s side of the invoice, which is what a freight bill audit produces.

What the Attribution Requires

The five numbers above come out of six calculations on one dataset. The calculations are simple. The dataset is where most mid-market shippers stop, because it means paid carrier invoices at the charge-code level, matched to shipment records that carry dimensions, and a class history per SKU across each docket date. Steps 1, 3 and 5 depend on data a rate-first freight operation does not usually keep. If your team cannot produce them, that is a finding in itself, and it explains the unattributed balance better than any of the six numbers would.

1. Pull 24 months of paid invoices, not quotes or accruals. Two peak seasons are required to separate a seasonal pattern from a step change. Quotes exclude every contingent charge by construction, which is what put the gap in the budget in the first place.
2. Calculate cost per shipment by month. If this line rose while shipment count stayed flat, the conversation is about price, and every question below is worth answering.
3. Calculate density by month. Total weight over total cubic feet. Look for a break, and check it against packaging changes, SKU mix shifts, and order-profile changes on the same timeline.
4. Isolate class changes across each docket effective date. Compare the class billed per SKU or shipment profile before and after each NMFC revision in the period. Separate shipments that moved up from those that moved down. The net is what you paid; the gross tells you where the exposure is.
5. Break out corrections and accessorials by charge code. Count corrected shipments, total the fees, and total the rate differences separately. Then split accessorials by code, because detention, redelivery, limited access, and excessive length have four different fixes.
6. Compute the realized rate increase per lane on your top 20 by spend. Compare to the announced percentage and take the gap to the carrier.

Anything left over is your unattributed balance. If it exceeds roughly 10%, the invoice data is not being validated against shipment records, and you are paying charges on the carrier’s word.

What to Do About Each Mechanism

The six causes take four different kinds of response and confusing them wastes the analysis.

Two need no carrier concession. Correcting class and capturing dimensions at tender removes the cause of two of the six mechanisms at once, without a negotiation. It does require dimensions in the shipment record, and a process for keeping class tables current, which is usually the gap rather than the willingness.

Consolidation is the underrated one. Accessorial and correction exposure scale with shipment count rather than weight, so combining four LTL moves into one volume LTL or truckload move reduces the linehaul and removes three independent opportunities for a fee. It routinely outperforms rate negotiation, and it never appears in a budget built rate-first.

The audit line is where most shippers have no mechanism at all. Validating a billed charge means confirming the event happened: that the address was residential, that the driver was held, that the pallet measured what the carrier says it measured. Most organizations have transportation negotiating rates and accounts payable paying invoices, with nobody reconciling the two against shipment records. The variance between them belongs to no one.

Frequently Asked Questions

Why did my LTL freight costs increase when my volume stayed the same?
Because LTL price per shipment rose independently of demand. Six mechanisms can raise the invoice with no change in what you shipped: how your freight is classified, the annual general rate increase, falling shipment density, accessorial growth under revised rules tariffs, reclassification and reweigh corrections, and fuel surcharge table revisions. Industry-wide, cost per shipment has held more than 40% above January 2018 levels while weight per shipment fell 20%.

How does freight classification affect what I pay?
Freight class sets your rate per hundredweight, so two shipments of identical weight on the same lane can price very differently. Classification rules are written by the National Motor Freight Traffic Association and revised on a docket cycle, which means your class can change without any change to your product or packaging.

What are the current NMFC changes?
Docket 2025-1 took effect July 19, 2025, moving classification toward density, consolidating about 2,000 commodity listings, and replacing the 11-tier density scale with 13 sub-provisions including new classes 50 and 55. Docket 2025-2 took effect December 6, 2025 and Docket 2026-1 took effect May 23, 2026. The cycle continues, so check the current docket rather than assuming your class table is still valid.

Do density-based classification changes make freight cheaper or more expensive?
It depends on density. Adding classes 50 and 55 at the dense end means heavy, compact freight can move to a lower class and a lower rate. Light, bulky freight moves the other way. Shippers whose density fell, through packaging changes, lighter SKU mix, or more partial pallets, pay more for the same items.

What is a reclassification charge and how do I avoid it?
A reclassification charge applies when the freight class on your bill of lading does not match what the carrier determines the freight is. It carries a fee plus the rate difference, and the rate difference is usually larger. Avoid it by capturing accurate dimensions and weight at tender and keeping class tables current. This requires no carrier negotiation and eliminates the cause of most corrections.

How much of an LTL cost increase is usually preventable?
Classification errors at tender, reweigh and reclass corrections, and billing discrepancies are data-quality and process failures rather than services you chose to buy. Rate increase incidence and fuel table changes are negotiable but not preventable. Density is a process problem with a one-to-two-quarter fix. The split between preventable and structural is specific to each program, which is what the 24-month decomposition establishes.

How do I reduce LTL freight costs without switching carriers?
Four levers, in order of speed. Correct class and capture dimensions at tender, which removes correction fees without any carrier negotiation. Consolidate shipments, since accessorial and correction exposure scales with shipment count. Audit invoices against shipment records to stop paying for events that did not occur. Then negotiate realized rate increase incidence lane by lane, using the carrier’s own tariff.

Why is my invoice higher than my quote?
A quote prices linehaul and fuel. Every other charge on a freight invoice is contingent, applying only if a condition is met at pickup, in transit, or at delivery. Accessorials, corrections, and compliance penalties cannot appear in a quote, so any budget built from quotes understates actual cost by construction.

Do retailer chargebacks count as freight cost?
They are freight cost under a different label. A missed appointment window, a late must-arrive-by date, or a labelling violation produces a retailer deduction from the invoice for the goods, and frequently a carrier accessorial for the same event. Most companies book the deduction to sales and the accessorial to transportation, so neither department sees the full cost of one execution failure. For a shipper moving into big-box retail, attributing an LTL cost increase means pulling chargeback data alongside carrier invoices.

What does a managed transportation provider do about this that a broker does not?
A broker prices and books the shipment. The six mechanisms above all happen after booking and arrive on the invoice, which a broker passes through. A managed transportation provider takes responsibility for execution through delivery and for reconciling what was billed against what happened, so class at tender, accessorial validation, correction disputes and rate-increase incidence each have an owner. For a mid-market shipper without a transportation analyst, that reconciliation is usually the function that does not exist internally.

Land-Link manages transportation for shippers who need the variance between the rate and the invoice to belong to someone. If your cost per shipment rose on flat volume and you cannot yet attribute it, that is the engagement. Book a managed transportation consult, or start with an FPI freight bill audit to establish what you are being billed.