Gross margin math behind every hanger

Initial markup (IMU): the difference between your first ticketed retail price and the landed cost, expressed as a percentage of retail. This is the margin you *plan* to earn if everything sells at full price.

Realized margin: what you *actually* earn after markdowns, promotions, and returns. This is almost always lower than IMU. The gap between the two is where fashion profits live or die.

One more distinction. Gross marginGross marginGross margin is the share of revenue left after subtracting the direct cost of producing goods or services, expressed as a percentage of revenue.View full definition → is expressed as a percentage. Contribution dollars are the actual dollars left after cost of goods. Executives obsess over margin percentage, but the bank account cares about dollars. Both matter, and they can move in opposite directions.

Building the $120 sweater from the bottom up

Let us construct a realistic (illustrative) cost stack for a mid-tier retail sweater. These figures are representative, not any specific brand.

| Line item | Cost |

|---|---|

| Factory (FOB) price | $18.00 |

| Ocean freight and insurance | $1.50 |

| Duty (import tax) | $2.80 |

| InboundInboundA strategy that attracts prospects organically via valuable content (blog, SEO, social) rather than interrupting them.View full definition → handling | $0.70 |

| Landed cost | $23.00 |

FOB means "free on board," the price at the factory's port before shipping. Apparel duties in many markets run in the mid-teens as a percentage of the factory price, so a few dollars of duty on an $18 sweater is normal. (For current United States duty rates by product, the USITC Harmonized Tariff Schedule is the free official reference.)

So the true cost to have this sweater sitting in the store is about $23.

The initial markup

The retailer tickets it at $120.

Initial markup in dollars: $120 minus $23 = $97.

Initial markup as a percentage of retail: 97 / 120 = about 81%.

That sounds enormous, and to a newcomer it looks like pure greed. It is not. That 81% has to absorb rent, store staff, marketing, e-commerce shipping, the sweaters that never sell, theft (called "shrink"), and the discounts we are about to apply. IMU is the *cushion*, not the profit.

A common industry rule of thumb is the "keystone" markup: double the cost. This sweater is marked up far more than keystone because apparel expects heavy discounting later. The high IMU is planned insurance against markdowns.

Scenario A: it sells at full price

Sweater sells for $120.

• Revenue: $120.00
• Landed cost: $23.00
• Gross margin dollars: $97.00
• Gross margin percent: 81%

This is the dream. Every full-price unit throws off $97 in contribution to cover overhead and profit.

Scenario B: the 40%-off sale

Now the same sweater goes on promotion at 40% off.

Selling price: $120 minus 40% = $72.

• Revenue: $72.00
• Landed cost: $23.00 (this does not change; the cost is already sunk)
• Gross margin dollars: $49.00
• Gross margin percent: 68%

Here is the counterintuitive part. The *price* dropped 40%, but the *margin percentage* only fell from 81% to 68%. Retailers point to this and say discounting is not so scary.

But look at the dollars. Contribution fell from $97 to $49. That is a 49% collapse in profit dollars from a 40% price cut. The percentage math hides the damage. The dollar math reveals it.

Why the dollar drop is bigger than the price drop

Because landed cost is fixed. When you cut $48 off the price, all $48 comes straight out of your margin, not out of your cost. The cost floor does not move, so the discount lands entirely on profit.

This is the single most important idea in retail finance: discounts are subtracted from contribution dollars, not shared with your supplier.

The break-even units problem

Here is where merchandisers earn their keep. How many discounted sweaters must you sell to match the profit of one full-price sweater?

Full-price contribution: $97

Promo contribution: $49

$97 / $49 = about 2 units.

You must sell roughly two sweaters at 40% off to make the same profit as one at full price. If the promotion does not at least double unit velocity, you lost money by running it.

Now push the discount deeper, to 60% off (common at end of season):

Selling price: $120 minus 60% = $48

Contribution: $48 minus $23 = $25

$97 / $25 = about 4 units. You now need four discounted sales to equal one full-price sale.

And at 70% off:

Selling price: $36

Contribution: $36 minus $23 = $13

You are still above cost, so you are not losing money on the unit itself, but the contribution is now so thin that a single return (with its shipping and restocking cost) can wipe out the profit entirely.

🎬 [VIDEO: "How Retail Markups and Markdowns Actually Work" — youtube.com — a clear walkthrough of retail margin math and the markdown cascade]

The full markdown cascade

Real garments rarely sell at one price. They move through a cascade over a season:

1. Full price ($120) for the first few weeks, capturing fashion-forward customers.

2. Promotional ($72, 40% off) once demand cools.

3. Clearance ($48, 60% off) at season end.

4. Liquidation (below cost) for the final stragglers, if needed, just to free up warehouse space and cash.

The realized margin for the *style* is the blended result of all units across all price points. A style might launch with an 81% IMU and finish the season at a realized margin of 50% or lower once the cascade is done. That gap is the number CFOs watch, often called markdown erosion.

This is why terms like sell-through (the percent of units sold at full price before markdowns start) are treated as sacred. A style with high full-price sell-through protects its margin. A style that needs deep discounting to move destroys it.

Why brands still discount if it is this damaging

If discounts hammer profit, why does every fashion retailer run them? Three financial reasons.

Cash conversion. Unsold inventory is dead cash sitting on a shelf. A 60%-off sweater that sells today converts inventory back into cash you can reinvest in next season's buy. Cash flow can matter more than margin on aged goods.

Carrying cost. Holding inventory costs money: warehouse space, insurance, capital tied up, and the risk it becomes even more unsellable. Every week a sweater sits, it gets less valuable. Marking down fast can beat marking down slowly.

Traffic and basket. A discounted item can pull a customer into the store or site, where they buy full-price items too. The loss leader logic. This only works if you actually track the full basket, not just the discounted unit.

The discipline is knowing *which* logic applies. Discounting fresh, in-season product that would have sold at full price is pure margin destruction. Discounting aged product to recover cash is smart. The math is identical; the timing is everything.

A quick way to pressure-test any promotion

Before approving a markdown, run this back-of-envelope check:

1. Contribution at full price = retail minus landed cost.

2. Contribution at promo price = promo retail minus landed cost.

3. Break-even multiple = full-price contribution / promo contribution.

4. Ask: will the promotion realistically lift unit sales by that multiple?

If the honest answer is no, the promotion is subsidizing customers who would have paid full price anyway.

For deeper grounding in these mechanics, the Investopedia guide to gross margin is a solid free primer on the percentage-versus-dollars distinction.

Key Takeaways

• Landed cost is the real cost floor: factory price plus freight, duty, and handling. On a $120 sweater it might be around $23, and it never moves when you discount.
• Percentage margin hides dollar damage. A 40% price cut dropped this sweater's margin percentage only 13 points but slashed contribution dollars by nearly half.
• Discounts come entirely out of contribution, not out of supplier cost. That is why deep markdowns are so financially dangerous.
• Run the break-even multiple before any promotion: full-price contribution divided by promo contribution tells you how many discounted units equal one full-price sale.
• Timing decides whether a markdown is smart or wasteful. Discounting aged inventory recovers cash; discounting fresh product just gives away margin you would have earned anyway.