Simple, Site-Wide, Stacked: The Only BFCM Offer Framework You Need (and the Margin Math Behind It)

"We spent three weeks building a tiered offer with five thresholds, and on Black Friday morning the data told us shoppers were comparison-shopping us in about four seconds." A founder said that to me on a call last year, half laughing, half furious. They'd out-thought themselves. The brand down the road ran "30% off everything" on a single banner and ate their lunch.

That line has stuck with me, because it's the whole BFCM offer problem in one sentence. Founders treat the offer like a maths puzzle to be optimised. Shoppers treat it like a yes-or-no glance. When those two things collide on the busiest shopping day of the year, the glance wins every time.

So here's the framework I'd give any Shopify brand heading into the back half of the year. It's three words. Simple, site-wide, stacked. Then I'll add the part most people leave out, which is the margin lens that decides which version you can actually afford, and the creative and timing plan that makes it land.

1. Simple

The first rule is the one founders fight hardest, and it's the most important. Reduce the mental calories it takes someone to understand your offer.

A shopper hits your site during BFCM with twelve other tabs open. Your wife, my wife, everyone's cart is full of half-decided purchases from a dozen brands at once. The question in their head isn't "let me model the optimal basket". It's "is this a good deal, yes or no". If they can't answer that in a glance, they close the tab.

"30% off everything" answers it instantly. "Spend A$120, get A$25 off, plus a free gift over A$150, plus an extra 10% if you buy three or more" does not. The second one might technically be a better deal for some baskets. Doesn't matter. You've made the shopper do arithmetic to find out, and they won't.

Here's my take: the cleverness you're tempted to build in is almost always for your benefit, not theirs. You want the offer to feel sophisticated. They want it to be obvious. Every layer you add is a tax on conversion. Build away from simple only for a real reason, and let the default be the version a shopper understands without thinking.

2. Site-Wide

The second S is the natural partner of the first. A site-wide offer is the easiest possible thing to digest, because there's nothing to check. Whatever you pick up is in the deal. No "selected lines", no exclusions to squint at, no working out whether the thing in your cart qualifies.

That simplicity is exactly why a flat sitewide percentage tends to beat a category-by-category patchwork. The patchwork makes the shopper do your merchandising for you, and they resent it.

But, and this is where the margin lens comes in, sitewide isn't free. This is the part the "just run 30% off everything" crowd skips. A flat sitewide discount comes straight out of your margin on every single unit, including the products that were already thin. So before you commit to it, you need to answer one question honestly: can your blended margin actually take it?

Here's how I'd think it through. Say you're a homewares brand with a roughly 70% gross margin. A 30% sitewide discount is comfortably affordable, because even after the cut you're still selling at a healthy margin and the volume more than makes up for it. Now say you're a brand carrying a 45% blended margin across your range. Take 30% off sitewide and on your lower-margin lines you're close to selling at cost, or under it once you load in shipping and the cheaper CPMs you're paying to acquire the sale. That's not a promotion, that's a donation.

So the rule isn't "always go sitewide". The rule is: go sitewide with a flat percentage when your margin can genuinely absorb it. When it can't, you don't abandon simple, you change the mechanic.

3. Stacked

The third S is where the strategy lives, and where you solve the margin problem without breaking the first two rules. "Stacked" means the offer builds across the BFCM window rather than sitting flat for five days.

The structure I like: Black Friday is your splashiest, widest offer, the one that speaks to the largest possible market. Cyber Monday is your highest dollar-value offer, the one that delivers the most actual savings and pulls a bigger basket. Same brand, building urgency, two different shapes for two different shoppers.

A clean worked version. Black Friday you run 30% off sitewide, the offer everyone understands and that captures the broadest audience. Then Cyber Monday you shift to a buy-two-get-one-free, or a higher threshold gift, or a BOGO on your hero range. The average order value climbs, because the shopper has to check out with more to get the bigger value, and that's the point. You're getting at a different pocket of the market. Most Black Friday shoppers want one or two things at 30% off. The Cyber Monday shopper is willing to load up the cart for a deal that's worth it.

This is also how the margin-conscious brand wins. If a flat 30% sitewide is too rich for your blended margin, you lead with a threshold or a gift-with-purchase instead of a straight percentage. A free gift over A$150 protects your margin far better than 30% off everything, because the gift has a fixed cost you control while the order value goes up. A "buy two, get one free" on a high-margin hero line is effectively a 33% discount but only on the products that can take it, not your whole catalogue. Same shopper-facing simplicity, very different damage to your P&L.

The mistake to avoid is over-stacking. I've watched brands run a twelve-days-of-deals structure, a new offer every day, a new campaign launched and an old one paused each morning. They become nightmares to follow and to manage. The sweet spot is two or three clear moves with connective tissue between them, not a dozen. Build to Cyber Monday. Don't bury it under fifteen smaller things.

The creative plan: one offer, many angles

Here's the bit that quietly does a lot of the work. One offer does not mean one ad.

The temptation, once someone hasn't bitten in three days, is to change the offer. Resist that. Change the angle instead. The same 30% off can be sold through your hero product, through a gifting angle, through a "treat yourself" angle, through ten different products. The offer is the constant. The creative is the variable.

If someone has seen "30% off, product A" three times and ignored it, the answer usually isn't a different discount, it's a different doorway in. Maybe product B speaks to them. Maybe the gifting framing lands where the self-purchase framing didn't. A diverse creative toolkit pointed at one simple offer reaches far more of the market than one ad shouting one discount.

So plan for volume of angles, not volume of offers. Make twice as many ads as you think you need, all carrying the same simple message through different products, hooks and audiences. That's where the back half of November gets won.

The timing nobody plans for: the early-November window

Last thing, and it's a margin point disguised as a timing point. The cheapest CPMs of the season are not on Black Friday. They're in early November, before the feed gets crowded and every brand on earth piles into the auction.

Conversion rates are highest over the Cyber weekend, true, but so is the cost to be seen. The smart move is to start warming earlier, when impressions are cheap, so you're not paying peak prices to introduce yourself to a cold audience on the most expensive day of the year. People don't wait for Black Friday the way they used to. A real chunk of shoppers start in early November, and you want something in front of them while the feed is quiet and the CPMs are low. Use the cheap window to build the audience. Use the weekend to harvest it.

Run it yourself

So that's the whole thing. Simple so the shopper says yes in a glance. Site-wide when your margin can take it, a threshold or gift when it can't. Stacked so Black Friday grabs the widest market and Cyber Monday pulls the biggest baskets. One offer carried through many creative angles, warmed early while impressions are cheap.

If you do one thing with this before the season, it's this: take your current BFCM plan and read it the way a distracted shopper would, in four seconds, with twelve tabs open. If you can't tell whether it's a good deal in that glance, it's too clever. Strip a layer off, run your blended margin against the discount to check you can actually afford the version you've picked, and let the creative do the rest. Curious what you land on. If you've got an offer you're not sure about, I'm always happy to hear what you're planning and tell you straight whether it passes the four-second test.