How to audit your telecom bill

A telecom bill audit is a line-by-line review of what you're charged against what you agreed to pay and what you actually use. You can do a competent first pass in-house with the steps below. Telecom audit firms widely cite a Gartner estimate that up to 80 percent of invoices contain inaccuracies; the estimate is old, but billing has not gotten simpler since.

By Shane Stewart, Founder. Last updated: July 2026.

Get the right documents first

A summary bill is designed to be paid, not read. Ask your carrier for two things: fully itemized invoices for the last three months, and a CSR, the customer service record. The CSR is the carrier's own inventory of every line, circuit, feature, and add-on billing on your account. Most businesses have never seen theirs, and the first read is usually educational.

Step 1: match the billing to reality

Go line by line through the CSR and ask one question: does this thing still exist? Circuits at locations you've closed, lines with no usage in the call detail, features somebody added for a project that ended in 2021. Post-disconnection billing, where a cancelled service keeps invoicing anyway, is common enough that audit firms treat it as its own category. At multi-location companies, run this per site; that's where the orphaned services hide.

Step 2: separate taxes from fees dressed up as taxes

This is the part carriers count on you not doing. The FCC's own guide to reading a phone bill draws the line clearly.

Actual government charges: federal excise tax, state and local taxes, 911 fees, telecommunications relay service charges. These are what they are.

Everything else with an official-sounding name is a carrier charge. Access charges are, in the FCC's words, "not a government charge or tax," and carriers "are free to charge less, or even nothing at all." Universal Service Fund line items are a pass-through the FCC allows but does not require, and the carrier cannot collect more than its own contribution rate. Single-bill fees, administrative fees, and "regulatory recovery" fees are carrier revenue with formal names. The word regulatory in a fee's name does not make it a tax, and unlike taxes, these are often negotiable at renewal.

Step 3: look for cramming

Cramming is, per the FCC, "the illegal act of placing unauthorized charges on your wireline, wireless, or bundled services telephone bill." The agency has estimated it has harmed tens of millions of American households, and businesses are not exempt.

The FCC's truth-in-billing rules require carriers to describe each charge in plain language, identify the provider behind it, and put third-party charges in their own section of the bill with a separate subtotal. So look there. The classic pattern is small and vague: a recurring "service fee," "membership," or "voicemail" at one to three dollars that nobody ordered, multiplied across lines and months.

Step 4: check rates against your contract

Pull the contract and compare the billed rate to the contracted rate, service by service. The usual finds: promotional rates that quietly expired, escalator clauses doing their annual work, and services repriced at renewal without anyone noticing. This is the audit step that connects directly to timing, because rate problems get fixed in the renewal window and merely documented outside it. A renewal calendar keeps you ahead of that.

Step 5: dispute in writing and keep score

Open disputes with the carrier in writing, item by item, and log every ticket number. Speed matters here: contracts commonly limit how far back credits can reach, so an error found late is money already gone. When the same error recurs, fix the cause, not just the charge. If disconnections keep billing, start demanding written disconnect confirmations every time.

When to bring in help

A do-it-yourself pass catches the obvious, and for a company spending a few hundred dollars a month on telecom, it's probably all you need. Where outside help earns its keep is the layer underneath: benchmarking your rates against what the market actually pays, contract language, and carrier escalation paths that don't route through the customer service queue. That's the job of telecom expense management, and it's most of what shows up in our assessments.

Stackstone Advisory is an independent technology advisor. If you'd rather have this done for you, the Technology Spend Assessment is free and covers exactly this ground. Book a discovery call or start with the assessment checklist.