The pros and cons of FAK, freight all kinds, come down to one number: the share of your shipping weight that classes above the FAK class you were given. Above the break-even, FAK saves you money and simplifies your billing. Below it, you are paying a premium to rate your cheap freight as if it were expensive freight, and the simplification is costing you real dollars every load.
Most FAK explainers stop at “it simplifies classification and usually saves money.” That is half true and it is the half that sells. The other half: an FAK at a class higher than most of what you ship is a rate increase with a friendly name, and the exclusions written under the FAK clause are where the savings quietly leave.
This post gives you the break-even calculation, both directions of the outcome, and the contract terms that decide which one you get.
What FAK actually is
An FAK agreement is a contractual override of classification. Instead of rating each shipment at its own NMFC class, you and the carrier agree that a defined set of your commodities will be rated at a single stated class, regardless of what the NMFC says each item is.
Note the word contractual. FAK is not an NMFC provision and it does not change your freight’s class. Under the NMFC, class is determined by density, handling, stowability and liability, and that determination is unchanged by your pricing agreement. What FAK changes is the class the carrier will bill at, for the freight described in the agreement, for the term of the agreement. Everything outside that description reverts to actual class.
The carrier’s willingness to offer one is not charity. It buys the carrier predictability, reduced inspection cost, and usually a volume commitment. It buys you a simpler bill and, sometimes, a lower one.
The break-even, worked
FAK is worth it when your blended actual-class cost exceeds your FAK cost. That is the entire test, and you can run it on a spreadsheet of last year’s shipments.
The numbers below are illustrative, chosen to make the arithmetic legible. Use your own rates.
Say a lane prices at these rates per hundredweight:
| Class | Illustrative rate per cwt |
|---|---|
| 50 | $28.00 |
| 70 | $35.00 |
| 100 | $48.00 |
You are offered FAK 70 covering classes 50 through 100. Take a representative 100 hundredweight of freight, 10,000 pounds, and run two mixes.
Mix A, 60 cwt of class 100 and 40 cwt of class 50.
- At actual class: (60 x $48.00) + (40 x $28.00) = $2,880 + $1,120 = $4,000
- At FAK 70: 100 x $35.00 = $3,500
- FAK saves $500, which is 12.5 percent.
Mix B, 40 cwt of class 100 and 60 cwt of class 50.
- At actual class: (40 x $48.00) + (60 x $28.00) = $1,920 + $1,680 = $3,600
- At FAK 70: 100 x $35.00 = $3,500
- FAK saves $100, which is 2.8 percent.
The break-even. With only two classes in play, blended cost is $28.00 plus $20.00 for every unit of weight share sitting at class 100. Setting that equal to the $35.00 FAK rate gives a class-100 weight share of 35 percent. Above 35 percent of your weight at class 100, FAK wins on this lane. Below it, FAK loses, and at exactly 35 percent you are paying the same money for a simpler invoice.
That threshold is the number to carry into the negotiation. It is not a rule of thumb, it is a calculation off your own volumes, and the two inputs that move it are your mix and the FAK class you are offered. Push the FAK class down one step and the break-even share drops with it.
Do it on weight, not on shipment count
The single most common error in FAK evaluation: running the mix on how many shipments were class 100 rather than how many pounds were.
LTL is priced per hundredweight. A hundred small class-100 shipments and ten large class-50 shipments can look like a 91 percent class-100 mix by count and a 30 percent class-100 mix by weight. Those two readings point at opposite decisions.
Pull twelve months of shipment-level detail, one row per shipment with actual class, billed weight and lane. Total the weight by class. That distribution, not your intuition about what you ship, is what you model.
Two refinements worth making once the basic model runs:
Model by lane, not in aggregate. Class mix varies by destination if your product lines serve different customers. An FAK that wins nationally can lose on your two heaviest lanes, and lane-level FAK is a normal thing to negotiate.
Model against the discount you would otherwise have. FAK does not exist in isolation. It sits inside a pricing structure that usually includes a discount off base tariff rates, and carriers trade one against the other. An FAK 70 at a 60 percent discount and actual class rating at a 70 percent discount are different deals, and comparing the classes alone tells you nothing. Compare landed cost per shipment under both structures on the same twelve months of freight. Everything else is theater.
When FAK saves you money
Your mix is genuinely high-class by weight. The clean case. If most of your poundage rates above the FAK class, you are converting expensive freight to a mid-class rate and the savings are structural.
Your product line is wide and mixed. A shipper moving forty SKUs across six classes spends real labor on classification, and gets it wrong sometimes. FAK collapses that to one number on the BOL.
Your reclass exposure is chronic. This is the underrated benefit. If a meaningful share of your shipments come back reclassed, an FAK covering the range removes the argument entirely for freight inside the description. That is not just money, it is the elimination of a recurring dispute workflow. If reclass charges are a monthly event for you, price that labor into the FAK evaluation, and in the meantime run the process in disputing a reclassification charge and the carrier’s dimensioner reading.
Your class is unstable. After NMFTA Docket 2025-1, issued January 30, 2025 and effective July 19, 2025, more items rate off one standard density scale where handling, stowability and liability are not concerns. If your packaging, palletization or product density varies batch to batch, your class now varies with it. An FAK converts a moving target into a fixed one, and that stability has value beyond the rate itself.
When FAK costs you money
Your mix is low-class by weight. The mirror image, and the most common way shippers lose on FAK. If the bulk of your poundage rates below the FAK class, every load pays an uplift. It is invisible on the invoice, because nothing on a bill shows you what the shipment would have cost at actual class.
The mix shifts after you sign. You modeled on last year. Then a dense product line grows, or you win a customer who buys the heavy SKU. FAK contracts run a year or more, and nothing recalculates automatically. Rerun the break-even quarterly against actual shipped weight. This is a fifteen-minute job and it is the difference between an FAK that pays and one that quietly stops paying in month seven.
The description is narrow and your freight drifts outside it. Freight outside the FAK description rates at actual class. If the agreement names a commodity list and you add SKUs, those SKUs are not covered, and nobody will tell you.
FAK is traded against a worse discount. The carrier gives you the FAK and takes back discount points. Landed cost is flat or worse and the deal looks like a win because the class number moved.
FAK becomes a reason to stop measuring. The quiet cost. Once class stops mattering on the BOL, shippers stop maintaining dimensions and weights. Then the FAK expires, or a shipment falls outside the description, and there is no accurate classification data left in the system to fall back on. Keep measuring regardless.
The clauses that decide the outcome
Read these five before you sign. They matter more than the class number.
| Clause | What to look for | Why it decides the outcome |
|---|---|---|
| Commodity description | Named SKUs, an NMFC range, or “all commodities shipped by shipper” | Narrow descriptions mean drift outside coverage. Broad ones are worth more than a step of class |
| Class range covered | The floor and ceiling classes the FAK applies to | Freight above the ceiling rates at actual class, which is often the exact freight you signed for |
| Exclusions | Hazmat, high-value, oversized, temperature-controlled, low-density | Exclusions are normal and reasonable, but they carve directly into your modeled savings |
| Minimum charge and weight break structure | Whether minimums and breaks change under FAK | An FAK class with a higher minimum charge can lose money on small shipments while winning on large ones |
| Reweigh and reclass authority | Whether the carrier retains inspection rights, and for what | FAK caps class disputes. It does not cap weight disputes |
That last row is the one shippers misread most. FAK does not protect you from a reweigh. Class and weight are separate rating inputs, and an FAK agreement fixes only the class. A carrier can still scale your shipment, correct the weight, rerate at the FAK class on the corrected weight, and charge a reweigh fee on top. Reweigh and reclassification are separate line items in the standard accessorial taxonomy for exactly that reason. Your declared weights still have to be right, which is the subject of auditing a reweigh charge and what the carrier must show you.
Auditing invoices under an FAK
An FAK simplifies rating and complicates auditing, because the correct class on your invoice is now defined by a contract rather than by a published standard. Your audit has to reference the agreement.
What to check on every invoice under an FAK:
- The billed class equals the FAK class. Carriers rate off systems that get updated by people. Freight billed at actual class when FAK applies is a straightforward overcharge, and it is common in the first two months after signing and again after any pricing amendment.
- The commodity is inside the FAK description. If it is not, actual class is correct and your dispute is unfounded. Know before you send it.
- The rate per hundredweight matches the FAK class rate on that lane, including the discount, in the correct order of operations.
- The weight is your weight. FAK does nothing here.
- Minimum charge applied correctly where the shipment is small enough to hit it.
- No reclass line. A reclass charge on freight covered by an FAK is either a system error or a coverage argument, and either way it needs an explanation before it gets paid.
Points one and two together are why the FAK agreement itself has to sit in your audit file next to the pricing sheet. An invoice audit that cannot see the contract cannot evaluate the class, which is the same structural problem as an invoice that does not match the rate confirmation, one level up.
The decision checklist
- Pull twelve months of shipment detail: actual class, billed weight, lane, and charges.
- Total weight by class. By weight, not by shipment count.
- Compute your blended cost at actual class using current rates.
- Compute the same freight at the proposed FAK class and rate.
- Find the break-even weight share, so you know how far your mix can move before the deal flips.
- Compare landed cost against the alternative structure, including any discount you would trade away.
- Read the commodity description, class range, and exclusions, and rerun the model with excluded freight priced at actual class.
- Confirm the minimum charge and weight break structure under FAK.
- Add the value of eliminated reclass disputes, using your own count of reclass charges from step one.
- Set a quarterly recheck against actual shipped mix, and a calendar reminder ninety days before renewal.
Step ten is the one that gets skipped, and it is where FAK deals go bad. The agreement does not fail on the day you sign it. It fails eight months later when your mix has drifted and nobody re-ran the numbers, which is exactly the class of slow leak that an ongoing audit exists to catch. If you are weighing whether that audit is worth buying or building, the pricing models freight audit is sold under is the honest comparison, and the deadlines that constrain any recovery you find are in the freight billing deadlines reference.
FAK is a good tool and a bad default. Run the arithmetic on your own freight, both directions, before you decide which one you have.
Sources
- NMFTA, NMFC changes 2025: how carriers can prepare (NMFTA)
- NMFTA, A guide to the NMFC changes coming in 2025 (NMFTA)
- Top 20 accessorial charges, practitioner taxonomy (Zipline Logistics)