--- title: "A billing config gap left usage overages uncharged" description: "Metered overages above plan limits were never billed because of a misconfigured usage rule. Marketing & margin audit: $70k/yr in margin identified." url: https://marginfix.ai/cases/a-billing-config-gap-left-usage-overages-uncharged/ lastmod: 2026-10-24 --- A billing config gap left usage overages uncharged. [Request an audit →](/book/) B2B SaaS · Usage based # A billing config gap left usage overages uncharged. This marketing & margin audit surfaced **$70k in annual margin** in a B2B SaaS business, evidenced, senior reviewed, and delivered in 6 days. $3–8M annual revenue Usage based Focus: Usage billing +$70k margin recovered / yr +8% captured usage revenue 6 days to findings Billable usage actually invoiced Before audit 92% → After fix 99% ## The business A usage based SaaS business charged customers for consumption above their plan limits, with overages calculated and billed automatically by its metering system. Because the billing ran automatically and revenue kept growing, the accuracy of the metering configuration was assumed rather than checked, and nobody reconciled billed usage against what customers were actually consuming. ## What triggered the audit Revenue per account looked lower than the consumption data suggested it should be, a gap that points at the billing layer rather than the product. The audit reconciled metered usage against what customers were actually invoiced, testing whether every unit of billable overage was genuinely being captured and charged. ## What the audit found The metering system was underbilling because of a configuration gap nobody had caught. A misconfigured usage rule meant a whole category of billable overage was being recorded for product analytics but never passed through to invoicing, so customers were consuming above their limits and simply not being charged for a portion of it. Because the billing ran automatically and total revenue kept rising, the shortfall was invisible. There was no error and no complaint, just quietly uncollected revenue on usage the customers themselves fully expected to pay for. The longer it ran, the more it compounded across a growing base. Reconciled against actual consumption, the uncaptured overage came to roughly $70k a year of revenue the company had genuinely earned but never billed. ◉ How we produced this finding Behind the usage billing finding is forensic reconciliation: MarginFix compared what was contracted, delivered, billed and paid until the leak was traced to the exact line, then had a named senior auditor verify it against the client’s own records before it was shared. Data sources: Contracts, invoices, billing records and delivery or fulfillment logs, reconciled against each other, so the exact gap behind usage billing is traced to the specific line driving it rather than estimated from the top down. Key frameworks: Line by line ledger and contract reconciliation, unit economics and cost to serve analysis, framed by Forrester Total Economic Impact (TEI) for evidenced business value, cost and risk. Human validation gate: Every reconciled figure is checked against your own records and signed off by a named senior auditor before it ships. Nothing is reported without a human tracing it to source. Verified against Subscription billing Product usage events CRM stage history Finance P&L The margin recovered / yr was measured like for like over a matched period, reconciled to recognized revenue in the ledger, and signed off by a named senior auditor before publication. Client identity redacted to protect their commercial position. WORKING PAPER ████████ Usage based Representative Redacted Revenue line Usage invoiced Base subscriptions 100% Add on modules 99% Metered overages 92% margin recovered / yr +$69,850 Recurring, recovered every year the fix holds, not a one off. Working paper: billable usage actually invoiced traced line by line and reconciled to recognized revenue in the ledger over a matched period. Line items representative and redacted; the recovered figure is the reconciled audit finding. ## What we changed ✓ Fixed the metering configuration so every category of billable overage flows correctly from consumption through to the customer invoice, with nothing recorded for analytics but never charged. ✓ Reconciled historical usage against billing to size the gap precisely and correct the underlying rule at its source rather than patching symptoms. ✓ Introduced a monthly usage to billing reconciliation, so any future metering drift is caught within the period before it compounds across the base. ✓ Added alerting on all billable usage categories, so a configuration change can never silently switch off revenue again. ## The result The outcomes were measured for three months after a 90 day implementation period. The published chart shows billable usage invoiced rising from 92% to 99%, a 7 percentage point increase. The annual figure describes earned usage that had gone unbilled; future capture after the configuration fix is a separate outcome. $70k a year of earned but unbilled revenue recovered, an annual figure equal to 12× the $5,950 Audit + Sprint fee, with no price change and no customer pushback, since it was usage they expected to pay for. For any usage based business, the risk is quiet: automatic billing looks healthy while a config gap leaks revenue with zero visible error. If you’ve never reconciled metered usage to invoices, you may be undercharging a growing base every month. A fixed fee audit reconciles it in days and closes the gap for good. From kickoff to signed off findings: 6 days. ![Portrait photograph of Alex Pop](/assets/team/alex-pop.jpg) Reviewed & signed off by: Alex Pop Senior Auditor · MarginFix · 10+ years of auditing experience ✓ Anonymized to protect the client · senior reviewed findings · Audit completed between 2024 and 2026, contracted through Cristian Bragau's practice before the MarginFix name existed · Published in the MarginFix library July 21, 2026 · Last reviewed October 24, 2026 ## What the client said B2B SAAS $70k a year found in 6 days Billable usage actually invoiced: **92% → 99%** “I expected a slide deck. Alex reconciled metered usage against invoices and found a whole category of overages recorded for analytics but never billed. A config fix, no price change, and customers expected to pay for it anyway.” **Head of Growth · B2B SaaS · Usage based** Written approval Under NDA 6 days to findings ![Portrait photograph of Alex Pop](/assets/team/alex-pop.jpg) **Alex Pop** Senior Auditor · signed this audit off [Request an audit →](/book/) [Prefer to talk it through first? Talk to an auditor →](/book/call/) ## More B2B SaaS findings [Partner referral fees were paid on deals sales had sourced directly, −$47k/yr](/cases/partner-referral-fees-were-paid-on-deals-sales-had-sourced-d/) [Paid was subsidizing a channel sales already owned, $41k/yr](/cases/paid-was-subsidising-a-channel-sales-already-owned/) [The cheapest leads were the most expensive customers, $68k/yr](/cases/the-cheapest-leads-were-the-most-expensive-customers/) [Content spend had no path to revenue, −$36k/yr](/cases/content-spend-had-no-path-to-revenue/) [A $1.2M ad budget hid a 40% wasted impression rate, −$74k/yr](/cases/a-1-2m-ad-budget-hid-a-40-wasted-impression-rate/) [Free tier support cost more than the plan earned, +$52k/yr](/cases/free-tier-support-cost-more-than-the-plan-earned/) [The benchmark: what audits recover across 74 cases →](/benchmark/) [All case studies](/case-studies/) [Model a B2B SaaS budget in the wasted ad spend calculator →](/estimator/saas/)