Why charging a margin % — not a markup % — protects your profit at every price point, regardless of vendor discount.
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Download PDF Guide ↓Most interior designers were taught to price procurement the same way: get the vendor cost, apply a markup percentage, and charge that to the client. It feels logical. The vendor gives you a number, you add a percentage on top, done.
But here's what that method actually does: it hands control of your profit margin to the vendor. Every time a trade discount is low, every time vendor pricing shifts, every time freight adds cost — your margin moves with it. Silently.
The fix isn't chasing better trade discounts. It's changing the math you use to calculate your selling price in the first place.
"Markup puts the vendor in control of your profit. Margin puts your financial architecture in control of your profit."
Markup and margin are used interchangeably — and that's exactly where the damage starts. They are not the same calculation. They produce different selling prices, different profit dollars, and a meaningfully different picture of your firm's financial health.
The vendor's cost anchors your price. Your margin floats with every pricing change they make.
Your target margin anchors your price. Your profit holds regardless of what the vendor charges you.
At 30–50% — exactly where design procurement operates — the difference between markup and margin isn't cosmetic. It's thousands of dollars per project that disappear without a trace.
| Markup % | Actual margin earned | Think you keep (per k) | Actually keep (per k) | Gap |
|---|---|---|---|---|
| 10% | 9.1% | 00 | 1 | − |
| 20% | 16.7% | 00 | 67 | −3 |
| 30% | 23.1% | 00 | 31 | −9 |
| 40% | 28.6% | 00 | 86 | −14 |
| 50% | 33.3% | 00 | 33 | −67 |
| 100% | 50.0% | ,000 | 00 | −00 |
A designer charging 40% markup believes she's keeping 40 cents on every dollar. She's keeping 28.6 cents. The highlighted rows are where most designers operate.
When you know vendor cost and want a selling price that produces a specific margin, the formula inverts. You solve for the price at which cost is the right proportion of revenue.
Your margin target anchors the calculation. The vendor's cost is an input — not the anchor.
A designer sources a sofa. Vendor cost: ,400. Target: 40% gross margin on procurement.
A 40% markup on a 00 item and a ,000 item both produce only 28.6% margin — but the dollar gap from your target grows with every larger purchase. Margin holds at target regardless of cost basis.
Overhead, labor cost, and profitability targets are all percentages of revenue. Procurement margin should match that framework — or you can't read the firm's full financial picture consistently.
When freight shifts or discounts fluctuate, markup locks you into a narrower profit band tied to vendor pricing. Margin reprices cleanly because the anchor is your selling price, which you control.
Low trade discounts stop being a threat. A 15% discount just sets your cost input. Your selling price comes from your margin target — not from what the vendor decided to offer this season.
Enter any vendor cost, your percentage target, and your actual project budget. Toggle between markup and margin to see exactly what each method produces and what you're leaving behind.
Trade discounts will always vary. Some lines offer 40% to the trade; others offer 15%. None of that needs to determine your profit margin. When your selling price is derived from a margin target — not a markup applied to vendor cost — your profitability becomes a function of your financial standards.
The formula is simple. The discipline is the practice. Apply it to every procurement item, on every project, and your margin stops being a variable that drifts with vendor pricing and starts being a standard you hold.
"A low trade discount isn't a pricing problem. It's a cost input. Your margin target determines your selling price — not the vendor."