When to Mark Down: The Timing Decision That Decides Your Season

The most expensive guess in retail

Every season, every buyer faces the same question on hundreds of SKUs: is this selling fast enough at full price, or do I need to discount it to move it before it's worthless? Get the timing right and you protect margin while clearing stock. Get it wrong in either direction and it costs you real money.

Mark down too early and you've thrown away margin on inventory that would have sold at full price anyway — the classic "I panicked in week three" mistake. Mark down too late and you're sitting on seasonal stock nobody wants, eventually clearing it at 70% off or eating it entirely. Markdown timing is one of the most consequential decisions in retail, and most stores make it on gut feel.

It doesn't have to be a guess. A few simple metrics turn it into a decision you can defend.

Sell-through is your north star

Sell-through rate is the percentage of received inventory you've sold in a given period:

Sell-through = units sold ÷ units received (over a window)

If you bought 200 units and sold 60 in the first four weeks, that's 30% sell-through. The question is whether 30% in four weeks is good or bad — and the answer depends on how long you have to sell the rest.

For seasonal goods, set a target sell-through curve up front. For example: 25% by week 4, 50% by week 8, 75% by week 12, with the rest cleared by season end. Then compare actual sell-through against the curve. Tracking ahead of the curve? Hold full price; you might even raise it. Tracking behind? That's your early-warning signal to act before it's too late.

Weeks-of-cover tells you how long you've got

Weeks-of-cover translates your current stock and recent sales rate into a runway:

Weeks of cover = current on-hand ÷ average weekly units sold

If you have 140 units left and you're selling 10 a week, you have 14 weeks of cover. Now line that up against how many weeks remain in the product's selling window. Fourteen weeks of cover with eight weeks left in the season means you will not sell through at the current rate — and that gap is exactly what a markdown is supposed to close.

The earlier you spot a cover-versus-calendar gap, the smaller the markdown you need. A 15% reduction in week 6 often moves the same stock that would require 40% in week 11. Acting early is cheaper than acting deep.

A practical markdown ladder

Rather than one dramatic clearance, use a ladder of smaller, escalating reductions tied to your sell-through checkpoints:

• First markdown (early, modest): When sell-through falls behind the curve by a meaningful margin, take a small reduction — enough to nudge velocity without trashing margin.
• Second markdown (mid-season): If the first didn't close the cover gap, go deeper.
• Final clearance (end of window): Whatever's left moves at whatever it takes, because carrying it costs you shelf space, cash, and attention into the next season.

Each step is a decision informed by the same two numbers — sell-through versus curve, and weeks-of-cover versus calendar — not by panic or by waiting too long.

Let the data set floors, not feelings

The hardest part of markdowns isn't the math; it's the discipline to act when the numbers say to, and to stop discounting at a floor when emotion says go lower. Set a price floor at cost plus your minimum acceptable margin, and don't breach it until true end-of-season clearance, when carrying cost makes any recovery better than none. A floor protects you from the spiral of chasing a sale all the way to a loss on items that simply needed more time or a better placement.

What markdowns can't fix

A markdown moves stock, but it doesn't fix the reason the stock didn't sell. Before you discount, ask whether the problem is price at all:

• Bad placement or merchandising — sometimes a slow item just needs a better spot, a fresh photo, or a bundle, not a price cut.
• Wrong product entirely — if it's a buying mistake, mark it down and learn from it, but don't repeat the buy.
• A demand shift you can read — if a category is cooling across your whole catalog, that's a seasonality signal for next year's buy, recorded now while it's fresh.

Use the markdown to clear, and use the reason to buy better next time. The merchants who win season after season aren't the best at discounting; they're the best at not needing to.

The takeaway

Markdown timing is a measurable decision, not a gut call. Set a sell-through curve before the season starts, watch actual sell-through against it, and use weeks-of-cover versus the calendar to catch shortfalls early. Act with a ladder of small, escalating reductions rather than one panicked clearance, hold a margin floor until true end-of-season, and feed every markdown's root cause back into your next buy. Do that and you'll protect margin on the winners and clear the losers before they become dead weight.