Technology Expense Management
Telecom Expense Management ROI: What an Audit Actually Returns
Key Takeaways
Gartner-reported research puts billing inaccuracies in up to 80 percent of telecom invoices, and audits typically find errors worth 7 to 12 percent of invoice value. ObsidianX audits typically identify 15 to 30 percent in total savings across errors, unused services, and above-market rates. The audit costs nothing upfront, takes 2 to 3 hours of your team's time to start, and a clean result is a cheap bill of health.
Written for CFOs and IT directors weighing two fair objections: we are too busy, and it probably will not find much. Here is the published data, what audits really find, and where the ranges come from.
The real cost of unaudited technology bills
Start with the published numbers, because they are less flattering to carriers than anything we would say ourselves. Gartner-reported research has found billing inaccuracies in up to 80 percent of telecom invoices: rate mismatches, duplicate charges, and billing that continues after disconnection. Treat that figure as the frequency of errors, not their size. The more conservative and more useful measure is value: industry audits consistently find that 7 to 12 percent of invoice value is errors, overcharges, or non-contracted services.
Errors are only half the leak. Industry studies also find that 20 to 30 percent of a typical telecom inventory is unused or underutilized services that keep billing every month: lines for closed offices, circuits for departed tenants, seats for former employees. Add contract drift, where 54 percent of expired promotional rates never revert to contracted pricing (industry-reported), and the cumulative waste in never-audited estates runs 12 to 18 percent of annual spend before anyone makes a single negotiation call.
None of this requires villainy to explain. Carrier billing systems are old, mergers stack systems on systems, and the burden of catching mistakes sits entirely on the customer. The bills are complicated because complexity favors the biller.
With a structured TEM audit vs without
| Dimension | With a structured TEM audit | Without |
|---|---|---|
| Monthly spend accuracy | Every line item validated against contract and inventory | Invoices paid as rendered; errors persist by default |
| Contract compliance | Billed rates checked against contracted rates each cycle | Rate drift goes unnoticed until someone stumbles on it |
| Recovery of past overcharges | Disputes filed with 6 to 24 month lookbacks where contracts allow | Historical overpayments quietly expire |
| Vendor consolidation opportunity | Overlaps identified and priced; invoices consolidated where it helps | Each site and acquisition keeps its own patchwork |
| IT and finance time on telecom admin | 2 to 3 hours to launch, then the audit team carries the work | Recurring hours lost to invoice questions nobody owns |
| Exposure to auto-renewal traps | Renewal calendar tracked; notice windows worked 60 to 90 days out | Contracts renew silently at whatever the current rate is |
| Ongoing rate competitiveness | Benchmarked against live pricing from 250+ suppliers | Rates reflect the market on the day you last signed |
What actually gets found in real audits
Published TEM provider data breaks program savings into roughly 45 percent from eliminating services that serve no purpose, 35 percent from rate-compliance corrections, and 20 percent from optimization. Here is what those categories look like on real invoices:
| Finding category | What it looks like | Typical scale |
|---|---|---|
| Billing errors and duplicates | The same circuit billed twice after a system migration; one documented case ran $8,200 a month for seven months | 5 to 10 percent of audit findings |
| Orphaned and unused services | Cancelled lines still billing, circuits at closed sites, zero-use mobile lines | 15 to 25 percent of findings; 3 to 7 percent of enterprise lines |
| Rate plan and tier mismatches | Usage crossed a volume tier but billing never rerated; 42 percent of volume agreements show tier errors (industry-reported) | Recurring monthly overcharge until corrected |
| Contract non-compliance | Negotiated rates never loaded after renewal; expired promos never reverted (54 percent fail to revert, industry-reported) | 12 to 20 percent of findings; can hit hundreds of lines at once |
| Tax and jurisdiction errors | Services taxed for the wrong state, city, or regulatory regime | 10 to 15 percent of findings |
| Consolidation opportunities | Overlapping vendors and circuits doing work one contract could cover | Case dependent; often the largest single line item |
For calibration, even Tangoe, the largest TEM software vendor, publishes that invoice auditing alone identifies 5 to 10 percent in first-year savings across the $15 billion of IT spend it manages. Invoice errors are the floor. The larger numbers come when you add unused-service cleanup, contract renegotiation, and consolidation, which is why full-program results land so much higher than audit-only results.
Why doing it yourself usually stalls
No knock on internal teams. A capable analyst with protected time and current market data can absolutely find real savings, and some do. In practice, most internal efforts stall for structural reasons rather than skill reasons:
- Carrier records take patience to extract. Service inventories and contract terms require signed Letters of Agency and follow-up; carriers have little incentive to make the process fast.
- Every carrier bills differently. Cross-referencing five vendors' invoice formats against contracts is specialist work that does not compress into spare hours.
- Benchmarks go stale. Knowing a rate is high requires knowing what the market charges this quarter, which means live pricing across many suppliers, not the rate card from your last signing.
- Findings need leverage to become savings. A spreadsheet of overcharges converts to refunds and lower rates only when the carrier believes you have a credible alternative. Competitive bids create that belief.
- Disputes have documentation standards. Carriers accept disputes in specific formats with specific evidence, and incomplete submissions quietly die in queues.
- The time never materializes. Enterprises that run TEM software platforms typically staff 2 to 3 people on this work. Teams asked to do it alongside day jobs usually audit one carrier, find something small, and stop.
A simple ROI framing
| Monthly technology spend | Conservative (15 percent) | Moderate (25 percent) | Higher-end (35 percent) |
|---|---|---|---|
| $10,000 | $18,000 per year | $30,000 per year | $42,000 per year |
| $25,000 | $45,000 per year | $75,000 per year | $105,000 per year |
| $50,000 | $90,000 per year | $150,000 per year | $210,000 per year |
| $100,000 | $180,000 per year | $300,000 per year | $420,000 per year |
Read this honestly. ObsidianX audits typically find 15 to 30 percent, so the first two columns reflect our real-world range. The 35 percent column is an industry-reported upper bound that shows up in never-audited, acquisition-grown estates with legacy circuits, and you should treat it as a ceiling, not a promise. Recently renegotiated, well-managed estates can land below 15 percent, and a clean audit is itself a useful result: independent confirmation before your next renewal that your spend is tight. Historical refund recoveries, where found, are additive to these ranges.
The free assessment answers one question: is your spend level and estate condition worth a full audit? Two to three hours of your team's time to gather invoices, and you get a straight answer either way.
How ObsidianX approaches TEM
ObsidianX runs a human-led, vendor-neutral TEM practice with engineering support. Analysts and engineers do the audit; we do not sell a software platform, and there is nothing to license or staff. Where findings exist, we help you capture them: we file the carrier disputes, run the competitive renegotiation against live pricing from 250+ suppliers, and manage consolidation where it genuinely helps. Engagements run as a one-time project or ongoing monitoring, whichever fits, and the model costs nothing upfront: we are compensated by suppliers at the same pricing you would pay going direct, so the findings report is yours regardless.
The verified results we publish are deliberately specific: HomeBoy Industries' 10-site consolidation returned $18,113.76 a year on a network that came out more resilient, and the Museum of Latin American Art cut $475.11 a month while doubling bandwidth. Real names, real invoices, real numbers.
The full Technology Expense Management pillar guideRun your numbers in the savings calculatorHomeBoy Industries case studyMOLAA case study
Frequently Asked Questions
The questions CFOs and IT directors actually ask before commissioning a TEM audit, answered plainly.
What does a TEM audit cost?
With ObsidianX, nothing upfront: we are compensated by suppliers at the same pricing you would pay going direct, and the findings report is yours regardless. Elsewhere in the industry, expect $1 to $5 per line per month for software platforms, $2 to $15 per line for managed services, or contingency fees of 20 to 50 percent of recovered savings.
How long does a telecom expense audit take?
The initial assessment takes 1 to 2 weeks once we have your invoices. Capturing the findings, including disputes, renegotiation, and service changes, typically runs 30 to 60 days. Full program ROI develops over 6 to 12 months as contracts come up for renewal (industry-reported).
How much of my team's time will this take?
About 2 to 3 hours to start: gathering 2 to 3 recent months of invoices per carrier, locating contracts, and signing Letters of Agency so carriers release records to us. After that, the audit team carries the work and comes back to you with findings and decisions, not tasks.
What data do you need to begin?
Recent invoices from each carrier and vendor, your current contracts and amendments, and a signed Letter of Agency per carrier. If invoices are scattered, that is normal; helping reconstruct the inventory is part of the audit, not a prerequisite for it.
Do you charge contingency fees or fixed fees?
Neither. Many TEM firms charge 20 to 50 percent of recovered savings or a fixed per-line fee. ObsidianX is supplier-compensated at direct-equivalent pricing, so you pay nothing upfront and keep 100 percent of the savings and refunds the audit produces.
How is this different from TEM software like Tangoe or Calero?
A platform processes invoices and flags anomalies, and your team does the disputing and negotiating, which is why platform customers typically staff 2 to 3 people on it. ObsidianX is the team: we do the analysis and the execution. If you already run a platform, we work alongside it and turn its flags into captured dollars.
What if the audit finds nothing?
Then you have something most companies never get: independent, line-item confirmation that your technology spend is clean, benchmarked against live market pricing, before your next renewal negotiation. Given the audit costs nothing upfront, a clean bill of health is the cheapest outcome on the table.
Will auditing and disputing charges damage our carrier relationship?
No. Billing disputes and rate reviews are contractual rights that carriers process through standard channels every day, and account teams expect them from well-run customers. In our experience the relationship usually improves, because the account finally has accurate inventory and a customer who reads the bill.
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