A Parcel Invoice Audit You Don't Have to Run Yourself.

We review your UPS and FedEx invoices line by line against your shipping data and your carrier agreement, and put a dollar figure on what you are owed. You send invoice data once.

No upfront costs. We'll tell you exactly what you can recover before we talk price.

What the audit finds | What you get | Who it is for | Who runs it | Questions

See your savings. No obligation, no carrier disruption.

If ShipSigma identifies savings and you engage, the fee structure is performance-based: ShipSigma is paid from savings delivered, not from a flat retainer.

The Charges That Do Not Look Wrong on the Invoice

A parcel invoice audit compares what the carrier billed against what actually shipped. The gaps fall into repeatable categories.

Dimensional weight billed on dimensions the package did not have
Duplicate charges against the same tracking number
Accessorials that did not apply, including residential and address correction
Service levels billed above what the shipment actually used
Fuel surcharge applied to the wrong base
Billing that deviates from the rates and discounts in your agreement
Charges the carrier corrected after the fact, including its own audit fee
Late deliveries eligible for a credit under the service terms in force at the time

None of these appear as an error on the invoice. Finding them means rebuilding every charge from your own shipment data and comparing it against what the carrier billed.

What One Audit Found

Over 60% of air packages could have shipped ground, with no delay in arrival.

The parcel invoice audit was a lifesaver for us. The team at ShipSigma monitored the weekly audit and noticed that instead of shipping air, over 60% of our packages could have traveled ground with no delay in arrival. They saved us more money than we had ever saved in our manual audit process.

Julie F., Chief Financial Officer, Industry Leading Retailer

A Wrong Charge Is Only Wrong Until the Window Closes

Correction runs on the carrier's terms and the carrier's timetable. FedEx requires a request for invoice adjustment on an overcharge within 180 days of the invoice date for U.S. shipments, and within 60 days for international shipments (FedEx Service Guide, 2026).

Both carriers reserve broad rights to adjust charges after the fact. UPS's Tariff and Terms and Conditions of Service, Section 52, states that UPS may bill on the shipping characteristics you submitted whether or not it audited the shipment, and that an audit fee may be assessed when a shipping charge is corrected.

Knowing whether a charge was right means rebuilding it from your own shipment data, and doing that before the window closes.

How the Audit Works

Step 1

You share your shipping invoice data, exported from your carrier portal.

Step 2

ShipSigma reviews your invoices at the line-item level for billing errors, misapplied surcharges and service-selection mistakes. Most reviews complete within days.

Step 3

You get a savings figure built from your own data, before any agreement or commitment.

Who Runs the Audit

ShipSigma is an audit and cost analysis team, not a software platform you have to operate yourself. Small parcel is the core of the work, and freight is covered too. Founded in 2018, the team draws on 250+ years of combined experience inside the major carriers' pricing, finance and business development functions.

The audit runs on your own shipping data, modeled against ShipSigma's own data set built from parcel and LTL shipments. You are not shown an industry average. You are shown what your own invoices contain, at the line-item level.

Get Your Free Analysis

What You're Committing To

The analysis is no-cost and no-obligation. ShipSigma does not contact your carrier, renegotiate anything, or make any changes to your shipping operations. The analysis tells you what's available.

You decide what to do with that information.

If ShipSigma identifies savings and you engage, the fee structure is performance-based: ShipSigma is paid from savings delivered, not from a flat retainer. ShipSigma's savings guarantee is quantified from your own analysis.

See What Your Carrier Hasn't Shown You

Questions Buyers Ask

Is this a one-time audit or an ongoing service?

Ongoing. ShipSigma reviews your invoices each week against your shipment data and your carrier agreement. The first analysis shows what is recoverable before you commit to anything.

How far back can you go?

Recovery is bounded by the carrier's own adjustment windows. FedEx requires a request for invoice adjustment on an overcharge within 180 days of the invoice date for U.S. shipments, and within 60 days for international shipments. Reviewing invoices every week keeps findings inside those windows.

What does the audit cost?

Nothing upfront. ShipSigma is paid from savings delivered, not from a flat retainer. If the audit finds nothing, there is no fee.

Do you contact my carrier?

No. ShipSigma does not contact your carrier, renegotiate anything, or change your shipping operations. You decide what to do with the findings.

What do you need from me to start?

Shipping invoice data, exported from your carrier portal. Most analyses complete within days of receiving it.

Do I have to change carriers or service levels?

No. The work is built around no operational change, without changing carriers or service levels.