--- title: "Margin Leak: Definition and the Five Patterns | MarginFix" description: "A margin leak is a recurring, usually invisible loss of marketing margin. What counts as one, how big a typical leak is across 74 audits, the five patterns." url: https://marginfix.ai/glossary/margin-leak/ lastmod: 2026-10-08 --- Your number See this page in your own figures: industry, spend and the estimated leak. [Run the estimator →](/estimator/) [Home](/) › [Glossary](/glossary/) › Margin leak Glossary · The audit # Margin leak A recurring, usually invisible loss of marketing margin, whether wasted paid spend, mispriced offers or retention drop off, that a healthy looking blended metric conceals. - Reviewed Oct 2026 - 2 min read - Part of the 14 term glossary - Median finding $58k a year across 74 audits 01 ## What Margin leak means A margin leak is a recurring loss of marketing margin that the usual reports do not show: paid spend that buys customers you already had, an offer priced below its true landed cost, a discount habit that trains buyers to wait, a retention drop off that new trial spend papers over. Each one repeats every month, and each one is invisible in a blended dashboard that reads green. The word leak is deliberate. A leak is not a one time mistake; it is a structural flow of money out of the margin, sized in dollars a year, that continues until someone measures it and closes it. The audit's job is to find the leaks, put an annual figure on each, and rank them. 02 ## The Margin leak formula and a worked example The formula and an illustration; the corpus line is the audited figure behind it. Margin leak = **recurring annual loss** an audited fix would stop Worked example *Illustration, not a client figure* A $3,000,000 revenue business leaking 18% of a $600,000 marketing budget is losing $108,000 a year while every blended report reads green. Across the 74 audits a median 18.7% of marketing spend was leaking, inside an 11% to 28% band. 03 ## Why Margin leak matters in an audit Across the 74 published audits, a median 18.7% of marketing spend was leaking, inside an 11% to 28% band, which works out to 1% to 3% of revenue. The five patterns the audits find most often are non incremental paid spend (68% of audits), attribution inflation (54%), mispriced offers (47%), retention leaks (41%) and discount habits (33%). A leak is sized, not described. For each finding the audit states the annual figure, the evidence behind it and the fix, so a reader can rank the list by value. The median highlight finding across the corpus is worth $58k a year, and the findings library ranks all 74. Most leaks are nobody's fault. They sit between teams, between an agency's reporting and the finance ledger, or inside a pricing decision made two years ago. That is why they survive: everyone is looking at a report that was never designed to show them. 04 ## Margin leak in the audited cases Published cases where Margin leak was at the center of the finding, each with the audited annual figure. - /cases/scaling-spend-was-hiding-a-134k-annual-margin-leak/DTC / Ecommerce ### Scaling spend was hiding a $134k annual margin leak - +$134k a year, findings in 6 days. - Read the case → - /cases/free-shipping-was-quietly-deleting-the-margin-on-every-third/DTC / Ecommerce ### Free shipping was quietly deleting the margin on every third order - +$47k a year, findings in 5 days. - Read the case → - /cases/bestsellers-were-priced-below-their-true-landed-cost/DTC / Ecommerce ### Bestsellers were priced below their true landed cost - +$59k a year, findings in 6 days. - Read the case → - /cases/rising-freight-never-reached-the-price-list/Manufacturing ### Rising freight never reached the price list - +$72k a year, findings in 7 days. - Read the case → - /cases/volume-rebates-were-paid-on-orders-that-never-hit-the-tier/Manufacturing ### Volume rebates were paid on orders that never hit the tier - −$118k a year, findings in 7 days. - Read the case → - /cases/returns-processing-cost-was-missing-from-channel-economics/Retail ### Returns processing cost was missing from channel economics - −$69k a year, findings in 7 days. - Read the case → - /cases/payment-fees-varied-by-tender-and-went-unmanaged/Retail ### Payment fees varied by tender and went unmanaged - +$38k a year, findings in 5 days. - Read the case → - /cases/a-surcharge-lag-was-never-passed-into-customer-contracts/Manufacturing ### A surcharge lag was never passed into customer contracts - +$79k a year, findings in 7 days. - Read the case → 05 ## Related terms and guides ### Related terms - [Wasted ad spend](/glossary/wasted-ad-spend/) Media budget producing no incremental margin. - [Non incremental spend](/glossary/non-incremental-spend/) Ad budget that buys conversions you would have won without it, classically branded search against customers already intending to purchase. - [Attribution inflation](/glossary/attribution-inflation/) When several platforms each claim the same sale, so attributed revenue adds up to more than 100% of actual revenue. - [Blended ROAS](/glossary/blended-roas/) Return on ad spend measured across every channel at once. - [MER](/glossary/mer/) Total revenue divided by total marketing spend, a blended, platform independent efficiency measure. - [Contribution margin](/glossary/#contribution-margin) Revenue minus every variable cost per order or unit: cost of goods, shipping, payment fees, returns. - [Take rate](/glossary/#take-rate) The percentage a marketplace keeps from each transaction. - [Dunning](/glossary/#dunning) The process of retrying failed recurring payments. - [LTV:CAC](/glossary/#ltv-cac) Lifetime value to customer acquisition cost, a headline health metric that misleads when LTV is built on revenue instead of contribution margin. ### Guides that use this term - [The five leak patterns](/margin-leaks/) Each pattern in depth: what it is, how it hides and how an audit finds it. - [Where SMB marketing budgets leak](/insights/where-smb-marketing-budgets-leak/) The narrative behind the figures: why most audits carry three leaks at once. - [What good looks like by spend band](/insights/smb-marketing-spend-benchmarks/) Leak share and the median finding from $10k to $250k a month. - [All 74 findings, ranked](/findings/) Every published leak by annual value, $58k median. - [Audit or in house review](/compare/marketing-audit-vs-in-house-review/) Which leaks your own team can close, and which need an outside read. - [Audit or consultant](/compare/marketing-audit-vs-consultant/) Cost, speed and what you walk away with, side by side. - [What an audit costs](/marketing-audit-cost/) The 2026 market ranges with sources, against the fixed fee tiers. 06 ## Questions about Margin leak ### What is a margin leak in marketing? A margin leak is a recurring loss of marketing margin that blended reporting hides: wasted paid spend, a mispriced offer, a discount habit or a retention drop off. It is sized in dollars a year and it continues until it is measured and closed. ### How big is a typical margin leak? Across the 74 published audits a median 18.7% of marketing spend was leaking, inside an 11% to 28% band, or 1% to 3% of revenue. The median highlight finding is worth $58k a year. ### How do you find a margin leak? By reconciling what the platforms report to what the ledger shows, then testing the gap: holdouts for paid spend, landed cost per order for pricing, cohort retention against trial spend. The five patterns page walks through each test. [Read the five leak patterns →](/margin-leaks/) ## Know the term. Now measure it in your own numbers. Margin leak, measured against your own accounts in 5 to 7 working days. $10k to $50k of findings, or your money back. [Book the audit](/book/) [Back to the glossary](/glossary/) Fixed fee. No retainer. NDA first. Go deeper ## Go deeper - [All 14 terms The full glossary: every term with a formula and a worked example.](/glossary/) - [All 74 findings Ranked by annual value, $58k median, each one a real case.](/findings/) - [The benchmark Where 74 SMB marketing budgets leaked, by share of spend and by industry.](/benchmark/) - [Margin leaks The five leak patterns in depth: what each one is and how an audit finds it.](/margin-leaks/) - [Marketing audit checklist Thirty checks across paid media, attribution, pricing, retention and reporting.](/marketing-audit-checklist/) - [What an audit costs The 2026 market ranges with sources, against the fixed fee tiers.](/marketing-audit-cost/)