You shipped the same product on the same lane with the same carrier you always use. The invoice came back higher anyway.
For a lot of shippers, that has been the quiet surprise of the past year. Nothing about the product changed, yet the freight cost did, and the reason traces back to the largest overhaul of freight classification in a generation.
If you move less than truckload freight, this is the change that has been reshaping your rates whether or not anyone told you it was happening.
What actually changed with the NMFC
The National Motor Freight Classification is the system that decides how less than truckload freight gets categorized and priced. Every LTL shipment gets a class, and that class drives the base rate.
In July 2025, the National Motor Freight Traffic Association began rolling out an initiative it calls Classification Reimagined. The first phase, effective July 19, 2025, moved roughly 2,000 commodities off the old commodity based system and onto a density based one. A second docket followed in late 2025, and additional dockets are continuing through 2026. The long standing 11 class density scale was widened to 13 tiers.
In plain terms: classification used to lean heavily on what your item was. For most freight now, it leans on how dense it is, measured as weight per cubic foot.
Why density based classification hits your invoice
Density is calculated with a simple formula. Take the weight of the shipment and divide it by its cubic volume. For palletized freight, that means including the pallet height, which is exactly the kind of detail that quietly gets missed.
Here is why it matters. Freight class runs from 50 for the densest, heaviest goods up to 500 for the lightest and bulkiest, and each step up the scale carries a higher rate. Move a commodity from one class to the next and the cost of the same physical freight can shift by 20 to 35 percent. Across a full shipping profile the average change is smaller, often in the low single digits, but for specific commodities the swings are real and they land straight on your P&L.
The pattern is straightforward. Bulky, lightweight freight tends to move to a higher class and cost more. Dense, well packed freight can move to a lower class and cost less. Carriers are also applying height rules on non stackable freight, charging for the full vertical space a pallet consumes.
The hidden cost is reclassification
The rate change is the visible part. The expensive part is often what happens when your paperwork falls out of step with the new system.
If your bill of lading still carries an outdated class, carriers now have both the equipment and the motivation to catch it. Many have invested heavily in dimensioners and automated weighing, and they are scrutinizing bills of lading more closely than ever. A mismatch triggers reclassification, which brings accessorial charges and billing disputes long after you thought the freight was priced and done.
Who wins and who loses
This overhaul quietly rewards good packaging discipline. Shippers who pack dense and measure accurately can land in a lower class and pay less than before. Guess at your dimensions or ship a lot of empty space, and the cost moves the other way.
The system now pays you to know your freight precisely. Uncertainty defaults to a higher class, and a higher class means higher spend.
What to do about it now
The good news is that this is manageable, and the shippers who act early tend to come out ahead. A practical starting point:
- Audit your highest volume commodities first, especially anything you ship hundreds of times a year, using the NMFTA item lookup tool and the current disposition bulletin.
- Re measure and recalculate density for those items, and remember to add pallet height for palletized freight.
- Update the class codes in your TMS, WMS, and ERP, and refresh your bill of lading templates so the right data flows automatically.
- Revisit any freight of all kinds agreements to confirm they still reflect your real class distribution.
- Tie packaging to pricing. Denser, stackable packing is no longer just a warehouse preference. It is a line item.
Turn a pricing change into a cost advantage
For most shipping teams, auditing thousands of line items across dozens of commodities is not realistic on top of the day job. That is where an LTL partner who actually knows your freight becomes valuable.
The right partner audits your classifications against the new system and models the cost impact before it ever shows up on an invoice. Where smarter packaging can earn you a lower class, they find it, and they catch reclassification charges before those turn into billing disputes. In our own LTL work, that kind of hands-on attention has helped shippers cut damage and lower cost, turning freight that used to feel like a monthly guessing game into something predictable.
The bottom line
The NMFC overhaul is not finished. More dockets are coming, and classification will keep evolving. The shippers who treat freight class as a living part of their cost structure, rather than a setting they configured once and forgot, are the ones who will protect their margins as the rules keep shifting.
If you are not sure how the new classifications are affecting your freight spend, that is worth finding out before your next invoice finds out for you.
Connect with our amazing team at ShipNova today for an unparalleled experience.
