Why your freight costs rise even though rates were locked

1. The short answer

Your freight rates can be locked in an annual tender and your freight costs can still rise — because the awarded rate is only the price of the lanes that are actually used at that rate. Tender leakage is the gap between the tendered rate and what you really pay once volume drifts to non-awarded lanes, carriers decline loads, spot freight fills gaps, and accessorials and fuel surcharges accumulate. The rate held; the cost leaked around it.

2. What tender leakage actually is

An annual freight tender awards a rate per lane to a carrier at an assumed volume. Reality then diverges from the assumption in several ways, each of which quietly raises the effective cost:

• Load rejection — the awarded carrier declines when capacity is tight, and the load goes to the next carrier at a higher rate, or to spot.
• Volume drift — production and demand move volume onto lanes that were lightly tendered or not tendered at all.
• Spot exposure — gaps are filled at the prevailing spot rate, which is volatile and usually higher.
• Accessorials & surcharges — detention, redelivery, fuel and mode-specific surcharges land on the invoice, outside the headline rate.

None of these breaks the tender. Each one leaks cost past it.

3. Where the money hides — SKU × lane × month

Leakage is invisible at the aggregate. Total freight spend can look on-budget while specific SKU × lane × month cells run far over — and those cells are where the intervention is. A useful diagnostic asks, per cell: what share of volume actually moved at the awarded rate, and what did the rest cost?

Illustrative pattern. The lesson holds: a handful of cells — often peak-season cold-chain lanes and newly ramped SKUs — carry most of the leakage. Find those, and you have found the freight budget's tail risk.

4. Why invoices are a lagging indicator

By the time freight invoices reconcile, the exposure is history — the loads have moved, the spot rates were paid, the quarter is closing. Invoice reconciliation tells you what leaked; it cannot stop it. That is the structural problem: the only signal most teams have arrives after the money is already spent.

5. What a leading indicator looks like

A leading indicator scores tail-risk per lane before the exposure lands — combining awarded-volume coverage, historical rejection rates, demand volatility per temperature class, and current spot-rate pressure. It surfaces the small set of lanes most likely to leak next quarter and recommends a targeted mini-tender for them before invoices reconcile.

This is what Synlogica Terminus Transport (Terminus M1) does: it measures leakage across SKU × lane × month, scores lanes by tail-risk, and produces a governed recommendation — with the input-data lineage so the number is auditable. The full method is in the tender-leakage white paper.

6. FAQ

If our rates are locked, how can freight cost rise?

Because the locked rate only applies to volume that actually moves at that rate. Rejected loads, off-contract lanes, spot fill and surcharges all raise the effective cost without touching the tendered rate.

Why not just tender more lanes?

Over-tendering ties up volume commitments and carrier goodwill on lanes that may not need it, and still can't cover volatility. Targeted mini-tenders on the specific high-leakage lanes are usually cheaper than re-tendering everything — the trick is knowing which lanes those are before the quarter.

How is leakage measured defensibly?

By reconstructing actual cost per SKU × lane × month against the awarded rate, with the data lineage recorded, so procurement and finance can replay the number rather than argue over a gut estimate.

7. References

• Standard freight-procurement practice: annual RFP/tender award vs realized cost reconciliation.
• Market rate benchmarks: ICIS, Fastmarkets, Argus (fuel and accessorial baselines).
• EU GDP (2013/C 343/01), Chapter 9 — transportation controls for temperature-sensitive freight.