Revenue growth shows that more product is leaving your building. It doesn’t prove the line is paying for the building.
Call the control point a line-card margin audit. It reads each growing line as a chain: the price the customer actually pays, the cost that actually lands, the supplier funding that qualifies, the stock commitment that turns, and the cash clocks on both sides.
Gross margin is an opening pool, not a finish line. Receiving, storage, picking, packing, delivery, sales coverage, credit, collections, returns, branch occupancy, and systems all need funding. A line can raise your revenue, produce a respectable gross-margin percentage, and make the bank balance worse.
The Headline
Separate three different results before you celebrate any of them.
- Revenue is the sell-through value. It answers whether more product shipped or billed.
- Contribution starts with realized selling price less the costs assigned to the sale. It answers what the line leaves to fund the operating system.
- Cash depends on inventory, supplier payment, customer collection, freight settlement, and rebate receipt. It answers whether the line can keep buying its own next order.
Published distributor results show why a single margin benchmark is useless. Avnet reported a 10.7% gross margin and a 2.3% operating margin for fiscal 2025. Wesco reported cost of goods sold equal to 78.9% of sales, implying a 21.1% gross margin before SG&A. Fastenal reported a 45.0% gross margin and a 20.2% operating margin for 2025.
Those differences reflect mix and operating system, not one company being better at arithmetic.
A line-card change can move your reported rate without anyone cutting a price. Avnet attributed part of its gross-margin decline to a geographic shift toward lower-margin Asian sales, and Fastenal says larger contract and Onsite customers typically produce higher volume at lower gross margins.
A sales increase alongside a falling gross-margin rate is a question about mix.
The Cost Record
Build one line-level record from three linked views:
- Landed cost records supplier cost and the policy treatment of inbound freight, rebates, price protection, inventory write-downs, and other assigned adjustments.
- Market evidence normalizes alternatives for quantity, quality, geography, service level, payment terms, included work, and date.
- Realized price retains list price, discount, concession received, approving authority, expiry, and final net price.
Don’t assume a supplier rebate is margin simply because purchasing expects it. Wesco recorded volume-rebate income equal to 1.4% of 2025 net sales and a $264.0 million rebate receivable at year-end, recorded as a reduction of cost of goods sold.
A rebate can be material, conditional, receivable rather than cash, and documentation-dependent.
Record the tier, eligible SKUs, purchase period, mix condition, claim evidence, expected receipt date, and eligibility after returns or price changes. Buy only to cross a rebate tier and you add stock your customers never absorb.
The Line-Card View
Use a common row layout so you can see price, supplier promise, and cash commitment together.
| Line or SKU group | Sell price | Supplier cost and freight | Rebate condition | Turns and stock state | Payment terms | Margin dollars and cash exposure |
|---|---|---|---|---|---|---|
| Fast-growing anchor line | Realized price, discounts, and expiry | Invoice cost; inbound-freight treatment | Tier, eligible purchases, claim evidence, receipt date | SKU-location turns; safety stock; immobile stock | Supplier due date; customer clearing behavior | Gross-margin dollars; inventory and receivables funded |
| Accessory or consumable | Realized price and attached-order logic | Landed cost and price protection | Mix, status, and exclusions | Replenishment cycles; emergency-freight risk | Supplier and customer clocks | Contribution after fulfillment; cash interval |
| Project or special-order line | Quote price and stated scope | Supplier quote, freight, and cost changes | Contractual eligibility | Customer-specific stock; cancellation exposure | Deposit, supplier term, and collection date | Margin by order; unrecovered stock exposure |
| Direct-ship line | Customer price and service responsibility | Supplier cost; drop-ship charges | Eligibility and claims owner | No warehouse touch; inventory-control boundary | Supplier payment and customer receipt | Margin after service and credit exposure |
Physical stock, owned inventory, committed quantity, and available-to-promise are separate quantities.
A product can sit in your warehouse without being your stock, and an accepted order can commit inventory before shipment changes physical on-hand.
That distinction is tedious right up until a fast-growing line gets allocated twice, or a consignment balance gets counted as owned working capital.
The Cash Clock
Turns show how often the same inventory investment earns you margin.
A 30% margin item sold once can produce less annual gross profit per warehouse dollar than a 12% item replenished six times. That comparison is an invented line-card example, not a target. Faster turns reduce exposure to price decline, design changes, spoilage, and cancellations. But stock cuts can damage fill rate and add emergency freight.
Keep the clocks beside your turn measure. Wesco says customer payments are normally received within 60 days, and Avnet reported $4.44 billion of receivables at its fiscal year-end.
Those figures show why revenue and available cash move on different calendars. A line that turns promptly can still tie up cash when the supplier is paid before the customer clears, and a rebate can look healthy until its receivable clears.
The U.S. Census Bureau reported an inventories-to-sales ratio of 1.19 for merchant wholesalers in June 2026. Census values inventory at cost and sales at selling value, without adjusting for markup.
That makes it a directional industry signal, not inventory turns. Your own calculation needs item-level cost of sales and average owned inventory.
Stock placement trades your cash against service. Fastenal held roughly 54% of year-end 2025 inventory at customer-near selling locations and 46% at distribution and manufacturing locations.
Local stock supports responsiveness but can strand slow movers. Central stock aggregates demand but adds transport time and handling. Measure turns by SKU and by location.
The Escalation File
A supplier increase shouldn’t arrive as a sales emergency.
The line needs an escalation record before the notice: base price, base date, exact index or cost driver, component weights, adjustment frequency, data version, treatment of revisions, notice requirement, effective date, and customer pass-through timing.
The U.S. Bureau of Labor Statistics notes that monthly Producer Price Index observations can be revised for up to 4 months after first publication. An index clause has to specify which series moves which cost component, from which base period, on which interval, and how revisions are handled. Your customer record needs the corresponding contract clause, notice date, and effective date.
Without both records, an increase arrives as a surprise.
Price protection and stock rotation belong in your review. Arrow reported price-reduction protection covering roughly 56% of inventory and supplier-repurchase arrangements covering roughly 59% at the end of 2025.
Price protection compensates eligible channel inventory when an authorized reduction lowers recoverable value. Stock rotation is a contractual exchange of eligible saleable inventory, not a warranty return or a termination buyback.
Both depend on agreement conditions, product status, traceability, authorization, and claim timing.
Read the Line, Not the Headline
Revenue rises but the gross-margin rate falls → line mix or rebate treatment changed beneath the headline
Compare realized price, landed cost, freight policy, product mix, and rebate eligibility by line. A lower-margin contract, a discounted anchor, or a rebate that no longer qualifies can all create the same top-line picture.
Margin rate looks steady but cash is tight → turns and payment terms were excluded
Compare your average owned inventory, SKU-location turns, supplier due dates, customer clearing behavior, freight settlement, and rebate collection. Gross margin doesn’t finance the interval between those dates.
A supplier price increase lands as a surprise → escalation, effective date, and customer pass-through weren’t linked
Reconstruct the base date, driver, affected products, source version, notice, and the date each customer price can change. Don’t pass through an increase you can’t tie to its derivation.
Margin dollars rise but operating cash doesn’t → a rebate, return, write-down, or fulfillment cost sits outside the report being celebrated
Check where you classify inbound freight, outbound delivery, supplier funding, price protection, and inventory losses are classified. Wesco classified $335.4 million of 2025 shipping and handling cost in SG&A, which is exactly why gross margin can’t be mistaken for contribution after delivery.
A direct-ship line looks cheap to serve but customer ownership weakens → the channel function migrated without being priced
A supplier shipment can remove a warehouse touch while you remain principal, set customer terms, carry credit risk, and handle returns. The channel is bypassed only when order acceptance, inventory responsibility, credit, customer ownership, and demand data all move away together.
Monday
Choose your five fastest-growing lines and compare last quarter with this one.
- Pull realized sell price, discount record, landed cost, inbound-freight treatment, and gross-margin dollars for each line.
- Attach the rebate condition, purchase period, claim evidence, claim status, expected receipt, price-protection rights, and stock-rotation conditions.
- Calculate turns on owned inventory at SKU-location level, then place supplier payment, customer clearing, freight, and rebate dates on the same cash view.
For each supplier increase you receive, connect base date, driver, revision policy, notice, effective date, and customer pass-through. For each direct-ship line, name who accepts the order, controls the goods, bills the customer, carries the receivable, handles the return, and receives the reorder signal.
Revenue says a line is moving. Contribution says it is worth moving. Turns and terms say whether it can afford to keep moving.
Read the line, not the headline. Price the whole chain. Fund the clock before the next order arrives.