Initial Markup (IMU) Formula
How apparel merchandisers calculate initial markup, illustrative IMU ranges by channel, and why it shapes the margin the rest of the season can keep.
What Initial Markup measures
Initial markup is the margin baked in before the first sale. It is the percentage of the retail price that represents gross margin at full price — the starting point for every dollar of margin the season can ever deliver.
IMU % = (Retail Price − Cost) ÷ Retail Price × 100IMU is expressed as a percentage of retail, not cost. A $32 cost / $88 retail item carries a 63.6% IMU, not a 175% markup. Both numbers are correct in their own frame; the one that governs planning is the retail-basis percentage. How the IMU target is set from the reduction plan, and how the price ladder and landed cost behind it change by category, is the subject of markup and pricing by vertical.
Worked apparel example
A DTC brand is pricing a cotton tee at $88 retail with a $32 landed cost (FOB plus freight, duty, and inbound).
IMU % = ($88 − $32) ÷ $88 = 63.6%
That 63.6% is the margin reservoir for the entire life of that SKU. Every markdown, every promotional discount, every allowance drains from it. If markdowns run at an illustrative 15% of net sales, net revenue per unit falls to $88 ÷ 1.15 = $76.52 and the final margin (MMU) lands at ($76.52 − $32) ÷ $76.52 = 58.2% — before returns, allowances, or cost overages take their share.
IMU of 63.6% gives you room for markdowns and still protects margin. Check it against the IMU target you set for the channel.
Illustrative planning ranges
Illustrative reference points, not a published benchmark — set targets from your own history.
Channel matters more than category here. Wholesale IMU is structurally lower because the retail partner takes their own margin. Luxury IMU is structurally higher because a low-markdown model protects brand equity. DTC falls in the middle but must carry return and shipping cost against the same IMU.
Failure modes we see
IMU treated as a styling decision, not a planning input. A designer picks a $78 ticket because it fits the brand story. The cost comes in at $34. The planner inherits a 56.4% IMU that will not survive the markdown season, and nobody flagged it until the product is already committed.
Specific patterns:
- Landed cost understated. IMU computed off FOB, not landed. Freight, duty, insurance, and agent commission all sit on top of FOB, so FOB-based IMU overstates the margin — in the illustrative 20%-uplift case in the FAQ below, 69.7% at FOB against 63.6% landed.
- Target IMU missing from the line plan. Without a target IMU per category, margin drifts style by style and nobody notices until hindsight.
- Single-channel IMU. One ticket priced for both DTC and wholesale takes an IMU hit on wholesale or leaves money on the table in DTC.
How RetailNorthstar handles IMU
In a connected system, every style carries a target IMU by channel from the moment it enters the line plan. Landed cost, ticket price, and IMU are linked — change any one and the other two update. If projected IMU drops below the category target, the style is flagged before the buy is committed.
IMU is the first decision that shapes the entire P&L for a season. Tight IMU + heavy markdown = margin collapse. Healthy IMU + disciplined markdown = plan delivered. See Maintained Markup for the full-cycle margin formula and Markdown % for the drain calculation.
Related formulas
- Maintained Markup — final margin after markdowns and allowances
- Markdown % — the drain on IMU
- Sell-Through Rate — the velocity that determines whether IMU survives
See RetailNorthstar link landed cost, ticket price, IMU target, and sell-through into one live margin view.
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Frequently asked about Initial Markup % (IMU)
What is the IMU formula?
IMU % = (Retail Price − Cost) ÷ Retail Price × 100. IMU is expressed as a percentage of retail price, not cost. A $32 cost / $88 retail item carries a 63.6% IMU.
What is a healthy IMU for apparel?
As illustrative reference points, not a published benchmark: DTC 55–65%+; wholesale 50–58%+ (capped by retail-partner margin demands); luxury 70%+; mid-market 55–62%. Set your own target from your markdown history. Category matters inside channel — the more markdown risk a fashion item carries, the more IMU it needs to absorb it.
Should IMU include freight and duty?
Yes. Landed cost — FOB plus freight, duty, insurance, agent commission, and inbound handling — is the correct input, because all of it comes out of the margin. Computing IMU off FOB alone overstates it. Illustratively, on the $88 retail / $32 landed tee on this page, a 20% uplift from FOB to landed puts FOB at $32 ÷ 1.20 = $26.67: IMU at FOB is ($88 − $26.67) ÷ $88 = 69.7%, against 63.6% at landed cost — about 6 points of margin the style will not deliver.
How is IMU different from MMU?
IMU is the planned margin at the original retail price — before any markdowns. MMU is the maintained margin after markdowns, allowances, and returns. The gap between them is the story of the season.