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ZBI Business Control Library

Gross Margin

Gross Margin: plain-English definition, formula, worked example, how to interpret the result, peer-based benchmark guidance, common mistakes, and management actions in the ZBI Business Control Library.

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What is Gross Margin?

Gross margin is what remains of revenue after you pay for the product or material that left the building—before payroll, rent, and the owner's draw. It is not net profit and it is not contribution margin on a single SKU unless your COGS definition matches that SKU view. At MetalPro d.o.o. in Osijek, EUR 500,000 revenue against EUR 320,000 COGS is 36% gross margin. I watch it every month because price lists and purchase contracts move at different speeds; when gross margin slips while revenue holds, procurement or mix shifted before overhead ever appears in the conversation.

Why Gross Margin matters

A two-point gross margin drop on EUR 500,000 revenue is EUR 10,000 gone before you pay anyone's salary—finance cannot cost-cut that back in the admin line. Sales sees it as discount creep on key accounts; production sees it as scrap and rework on the same routings that quoted higher margin last quarter. Customers feel it later when you defer tooling maintenance or stretch delivery to protect what is left. Banks rarely covenant on gross margin, but owners and commercial directors should—because it is the first place channel mix, steel index moves, and rebate programmes show up in euros, not in narrative.

Formula and variables

Gross Margin % = (Revenue − COGS) / Revenue × 100

Revenue — net sales in the period after returns and trade discounts; match your P&L.

COGS — direct material, direct labour in COGS, and manufacturing burden you capitalise in product cost—not SG&A.

Excel: =IFERROR((B2-B3)/B2*100,0) — B2 revenue, B3 COGS.

Real business example

MetalPro d.o.o., a EUR 6M steel fabrication shop in Osijek, closes Q1: revenue EUR 500,000; COGS EUR 320,000 including sheet metal, subcontract welding, and consumables capitalised in WIP. Gross margin = (500,000 − 320,000) / 500,000 × 100 = 36%. Q1 prior year was 38%—the bridge shows EUR 8,000 of index-linked material increase and EUR 2,000 of mix shift toward lower-margin structural brackets. The commercial director holds list prices but flags three accounts where net realisation fell below 32% for two months running.

How to interpret the result

Gross margin is a blend of price, cost, and mix—split the bridge before reacting to the headline.

  • Define COGS the same way every month; moving freight or warranty between COGS and SG&A distorts trend.
  • Compare to the margin assumed in your standard cost and quote model—not only to last year.
  • Segment by product family or customer tier; a flat 36% can hide a crisis in one line.
  • Pair with inventory and scrap reports when margin falls on stable list prices.

Benchmark context

Metal fabricators in the EUR 3–10M band often run 30–42% gross margin depending on custom work versus catalogue product—peer averages are useless without matching COGS definition. Benchmark against your trailing twelve months and against the margin baked into open quotes. A sustained drop of two points over two quarters usually precedes net margin pressure within one reporting cycle.

Red flags

  • Gross margin down three consecutive months on flat revenue—structural cost or price issue, not noise.
  • Headline margin stable but A-class SKU margin down 4+ points—mix masking deterioration.
  • Purchase price variance favourable while gross margin falls—check discounting and returns.
  • Standard cost frozen 18+ months while material index moved 15%—quotes misstate reality.
  • Gross margin above plan but cash tight—investigate WIP build and unbilled project revenue.

Common mistakes

  • Comparing gross margin to a peer that capitalises freight in SG&A while you include it in COGS.
  • Reacting to one month without separating volume/mix from purchase price variance.
  • Using revenue net of VAT in the numerator but gross purchases in COGS.
  • Ignoring rebate accruals until year-end—margin looks fine until the true-up hits.
  • Treating scrap write-offs as overhead when they belong in COGS for operational control.

What should management do next?

  • Publish a monthly gross margin bridge: price, mix, purchase variance, scrap, and other.
  • Review accounts below floor margin with commercial and finance in the same meeting.
  • Reconcile standard cost assumptions to actual COGS each quarter.
  • Tie procurement savings targets to gross margin, not only to purchase price on paper.
  • Escalate any SKU family below breakeven contribution for two months to pricing or exit.

Related templates & software

FAQ

36% gross margin—should MetalPro raise prices or push procurement?

Run the bridge first. If purchase variance drove the drop, renegotiate index clauses; if net price fell, fix discount governance before blaming material.

How do I separate mix effect from true margin erosion?

Hold mix constant at prior-period weights on current costs, then hold costs constant at prior prices on current mix. Finance and ops should agree the bridge format once.

Does gross margin include labour in COGS for a job shop?

Only direct shop labour capitalised in WIP and released with the job. Engineering and supervision in SG&A stay out unless your policy puts them in product cost consistently.

When should gross margin trigger a customer renegotiation?

When net realisation on a key account sits below your documented floor for two closes, or when you ship at negative contribution to hold volume.

Who owns the monthly gross margin review?

Commercial owns price and mix; procurement or ops owns material and scrap. CFO publishes one number with the bridge—split ownership without a joint review produces arguments, not fixes.

Summary

Gross margin shows what product economics leave before overhead. Define COGS consistently, bridge the monthly move, and act on price, cost, and mix—not on the headline alone.

Reviewed by ZBI Business Control Library · Last updated 2026-06-15