Discount leakage: the deal that looks fine at invoice and bleeds at pocket

Decide course — make the call

• Track: Sales & Revenue
• Difficulty: Beginner · 4/8
• Read time: ~20 min, then you make the call
• The concept: discount leakage & pocket margin
• Scored decision — one defensible answer, reasoning shown. You pick the call; every wrong option shows what it costs you. This is a Decide course: you make a judgment, you don’t run code, and it is not a certification.
• ▶ Interactive model — a calculator on this page turns your own numbers into the decision, so you can stress-test the call yourself.

1. Before you start

A list price is the number on the price sheet. The pocket price is what you actually keep after every discount, rebate, allowance, and cost you agreed to along the way. Sell a case listed at $100, give a 20% channel discount and then a 2% early-payment discount, cover $3 of freight, and pay a $2 rebate, and you do not keep $100 — you keep about $73. That $73, not the $100 on the sheet and not the invoice figure in between, is the number that decides whether the deal made money.

The gap between list and pocket is discount leakage, and the margin measured on the pocket price is pocket margin. The trouble is that leakage arrives in small, separate pieces — a point here, a rebate there, freight you forgot you were paying — and each looks too small to argue about. Stacked, they routinely cut a deal’s real margin far below what the invoice shows.

Three honest statements before you start:

• This is a Decide course. You read a situation, learn the idea, and make a call. You do not write or run any code.
• The companies below, Kestrel Fasteners and Calderport Packaging, are composite — invented firms built from ordinary figures so the arithmetic is clean. No number is a claim about any real company.
• This is not a certification. It proves, to you, that you can defend a pricing call.

You need only arithmetic. The hard part is seeing the leaks the invoice hides.

2. The Situation

Kestrel Fasteners makes industrial bolts and anchors and sells them through distributors. A rep wants to hold a big distributor account by sweetening its terms, and points at the invoice: “we still clear a 31% margin on this line, there is room to give.” The finance lead is uneasy but cannot say why in the room. You have to make the call, and the invoice both of them are staring at is not the number that matters.

The deal can show a comfortable invoice margin and still earn almost nothing once every off-invoice discount is counted — and whether that is happening here turns on figures that never appear on the invoice at all.

3. What you’ll be able to do

After this course you will be able to:

• Build a price waterfall from list price down to pocket price, and read the pocket margin it leaves — not the invoice margin everyone quotes.
• Separate on-invoice discounts from off-invoice leakage, and explain why the second kind is the one that quietly does the damage.
• Decide whether a deal clears a pocket-margin floor, and name the single lever that would flip the call.
• Spot how a stack of “small” concessions compounds into large leakage, and choose which one to cut.

4. Prerequisites & time box

Prerequisites: arithmetic, and the idea of a margin (price minus cost, as a share of price). Helpful but not required: having seen a discount or rebate on a real invoice. No spreadsheet, no finance background.

Time box: about 20 minutes of reading (measured), plus your own thinking time on the call. That is under the 25-minute cap for a concept course.

Difficulty: 4 / 8 — a new-manager decision: a couple of interacting factors and one real judgment call, where the obvious answer is often the trap.

5. The case & where the numbers come from

Kestrel Fasteners is a composite manufacturer: its price sheet and discount structure are built from ordinary figures an industrial-components maker would recognise, chosen for clean arithmetic and not drawn from or claimed about any real firm. The definitions — list price, on-invoice and off-invoice discounts, rebates and allowances, gross and pocket margin — are standard and cited in section 11. The price-waterfall / pocket-price framing is the one set out by Michael Marn and Robert Rosiello (McKinsey) in their work on pricing; the concept is theirs, the numbers below are ours. Every dollar in the table is an in-course assumption; every later number is computed from these.

Item (per case)	Figure
List price	$100.00
On-invoice: standard distributor discount	$15.00
On-invoice: order-volume discount	$6.00
On-invoice: quarterly promotion	$4.00
Off-invoice: early-payment (cash) discount	$1.50
Off-invoice: annual volume rebate	$3.00
Off-invoice: co-op advertising allowance	$2.25
Off-invoice: freight we pay	$2.00
Off-invoice: payment-terms carrying cost	$1.25
Cost of goods sold (COGS) per case	$52.00
Kestrel’s pocket-margin floor	$12.00 / case

6. The Concepts

The price waterfall

A price waterfall starts at the list price and subtracts, step by step, every discount and cost a deal carries, until what is left is the money you actually pocket. Kestrel’s case, one step at a time:

• Start at the list price: $100.00.
• Subtract the on-invoice discounts — the ones printed on the invoice itself: the $15 distributor discount, the $6 order-volume discount, and the $4 quarterly promotion. That is $25 off, leaving the invoice price: $100 − $15 − $6 − $4 = $75.00.
• Subtract the off-invoice items — the ones that never show on that invoice: $1.50 early-payment discount, $3.00 annual rebate, $2.25 co-op advertising allowance, $2.00 freight, and $1.25 in payment-terms carrying cost. That is another $10.00, leaving the pocket price: $75.00 − $10.00 = $65.00.

So the water falls from $100 list → $75 invoice → $65 pocket. Total leakage from list to pocket is $100 − $65 = $35 a case, and only $25 of it is on the invoice anyone looks at.

On-invoice versus off-invoice discounts

The split matters more than any single number. On-invoice discounts are subtracted before the invoice prints, so the invoice price ($75) already shows them; anyone reading the invoice sees that the customer paid less than list. Off-invoice items — rebates paid quarterly, allowances credited later, freight buried in logistics, the cost of waiting 60 days to be paid — land in different ledgers, at different times, often owned by different people. Nobody sees them lined up against the deal.

That is exactly why off-invoice leakage does the quiet damage. Kestrel’s finance lead quotes the invoice margin: invoice price minus COGS, $75 − $52 = $23, or $23 ÷ $75 = 30.7% — the “31%” the rep pointed at. But $10 of off-invoice cost is still to come. The invoice margin is a real number measured against the wrong price. The deal has not earned 31%; that is only what it looks like before the below-the-line items are counted.

Pocket price and pocket margin

The pocket price is what survives the whole waterfall — here $65.00. The pocket margin is the margin measured on it: pocket price minus COGS, $65 − $52 = $13.00 a case, or $13 ÷ $65 = 20.0%. That is the number that decides the deal.

Set it beside the others and the leak is obvious:

• Margin on list ($100): $48, or 48%.
• Margin on invoice ($75): $23, or 30.7% — what the rep quoted.
• Margin on pocket ($65): $13, or 20.0% — what Kestrel keeps.

Kestrel’s floor for this line is $12 a case. At $13 the deal clears the floor — but only just, and the rep wants to give more. Add a single further concession — say a 2-point bump to the co-op allowance, $2.25 → $4.25 — and off-invoice leakage rises from $10.00 to $12.00, the pocket price falls to $63.00, and pocket margin drops to $63 − $52 = $11.00, below the $12 floor. Same list price, same “we still clear 31% on the invoice,” opposite call — and the fact that flips it is a $2 line the invoice never shows.

(An interactive calculator sits here — enter the list price, each on-invoice and off-invoice discount, the cost, and the floor, and it returns the invoice price, the pocket price, the pocket margin, and whether the deal clears the floor. Change one off-invoice line and watch the decision flip.)

How small discounts compound into leakage

No single item on Kestrel’s waterfall looks worth a fight. The early-payment discount is 2% of invoice. The rebate is $3. Co-op is $2.25. Freight is “just shipping.” Each one, alone, is a rounding error against a $100 list price. The point of the waterfall is that they do not act alone — they stack. Five off-invoice items of $1.25 to $3.00 each add to $10.00, which is $10 ÷ $75 = 13.3% of the invoice price. That single stack is what pulls the deal from a 30.7% invoice margin down to a 20.0% pocket margin — it erases a third of the margin the invoice showed.

This is why leakage is a pocket-margin problem, not a “one bad discount” problem. You will rarely find one concession that sank a deal; you find a dozen small ones that nobody added up. The fix is not to ban discounts — some earn their keep by winning volume — but to price and judge every deal at the pocket line, so the stack is visible before you agree to the next point. When a deal comes in under the floor, the move is to find the one or two off-invoice items you can cut with the least damage to the relationship, not to shave the headline price further.

7. Your Call

You have seen how the waterfall, the on-invoice/off-invoice split, and pocket margin decide Kestrel’s call. Now a different one lands on your desk.

Calderport Packaging makes corrugated shipping boxes and sells bundles to regional distributors — a different company from Kestrel’s fastener shop. One bundle lists at $120. Its on-invoice discounts are a $18 distributor discount, a $6 volume discount, and a $6 promotion. Its off-invoice items are a $1.80 early-payment discount, a $3.60 annual rebate, a $2.70 co-op advertising allowance, $3.00 of freight, and $0.90 of payment-terms carrying cost. COGS is $66 a bundle, and Calderport’s pocket-margin floor is $14 a bundle. There is a wrinkle: the $2.70 co-op allowance is locked by a signed marketing agreement and cannot be touched this year. Rather than a plain accept/reject, your job is to say whether the deal clears the floor and, if not, which single lever to cut to get it there.

How this differs from the taught case (the transfer): this is a different company and sector — a corrugated-packaging maker, not Kestrel’s fastener manufacturing; the figures are different, so the arithmetic must be redone, not recalled; it adds a new constraint — one discount is contractually locked and off-limits; and it is a different kind of decision — you choose which lever to cut to clear the floor, not just read one deal’s margin. The core concept is the same: list-to-pocket leakage and pocket margin decide the call.

8. Self-check

Before you write the memo, make sure you can say each of these in one line:

• Why is the “31% invoice margin” the wrong number to judge Kestrel’s deal on?
• What is the difference between an on-invoice discount and an off-invoice one, and why does the second kind do the quiet damage?
• How do you turn a stack of small discounts into a single pocket-margin number, and what is the one lever that would move it across the floor?

If any is fuzzy, reread section 6 — the waterfall, the on-invoice/off-invoice split, pocket margin, and the compounding stack are the whole course.

9. Stretch

Push the decision further on your own:

• Back at Kestrel: the rep says the extra co-op point will win 20% more volume on the line. At a $65 pocket price and $52 COGS, how much extra volume is needed to make the sub-floor $11 pocket margin worth it — and is “make it up on volume” the right frame, or a way to avoid the pocket number? (The genuinely harder one: compare total pocket contribution before and after, not margin per case.)
• If Calderport could move its 60-day payment terms to 30 days, cutting the $0.90 carrying cost in half, does that change which lever you would cut first? What is the new pocket margin?
• Write the one sentence you would say to a rep who insists “the invoice margin looks fine, we have room to give.”

10. Ship it — your decision memo

Write a one-page memo to Calderport’s sales director. State the call (the deal does not clear the $14 pocket-margin floor at a $12 pocket margin; shift the $3 freight to the customer to reach $15, since the $2.70 co-op allowance is contractually locked). Show the waterfall in three lines: $120 list → $90 invoice → $78 pocket, with pocket margin $78 − $66 = $12. Name what you rejected (judging the deal on the 26.7% invoice margin; cutting the locked co-op; shaving the headline price) and why. Name the one thing that would change your mind (a floor met another way, or volume large enough to carry a sub-floor margin — measured as pocket contribution, not per-case margin). Keep it to a single page a director grasps in two minutes. This memo is your own argued claim — not a credential.

11. Sources

Kestrel Fasteners and Calderport Packaging, and every dollar figure attached to them, are composite and illustrative — constructed for clean teaching arithmetic, not drawn from or claimed about any real company. The concept definitions and the price-waterfall framing used to reason about them are standard; references below.

Concept / claim	Source (publisher)	URL	Accessed
List price (the published price before discounts)	Wikipedia — List price	https://en.wikipedia.org/wiki/List_price	2026-07-20
On-invoice / off-invoice discounts, cash discounts, allowances, co-op	Wikipedia — Discounts and allowances	https://en.wikipedia.org/wiki/Discounts_and_allowances	2026-07-20
Rebate as an off-invoice, after-the-fact payment	Wikipedia — Rebate	https://en.wikipedia.org/wiki/Rebate	2026-07-20
Gross margin = price − cost, as a share of price	Wikipedia — Gross margin	https://en.wikipedia.org/wiki/Gross_margin	2026-07-20
Cost of goods sold (COGS)	Wikipedia — Cost of goods sold	https://en.wikipedia.org/wiki/Cost_of_goods_sold	2026-07-20

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Finished this call? Continue the Sales & Revenue track:

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