Should your next promotion be a BOGO or a straight price cut?
A buy-one-get-one and a straight price cut can move roughly the same total volume for roughly the same total spend. Shoppers react to them very differently. Retailers feel about them very differently. And in several markets, regulators have started restricting multi-buy formats on whole categories. This guide walks you through the choice before your next promotional planning cycle, with the money worked out on what you are actually paid for a pack.
You have a promotional slot to fill. Your retailer wants a big number on the shelf. Your brand team wants a controlled mechanic. Your Profit and Loss (P&L) wants the cheapest option. You have two main ways to give shoppers a deal on your hero pack: a buy-one-get-one (BOGO, sometimes called half-price multi-buy), or a straight percentage price cut for the promo window. This guide walks you through the choice before you commit the slot.
Same money in, very different outcomes
Your shopper pays for one pack and takes two home. Effective per-pack price is half the shelf price during the promo window.
- What happens to your sales
- Big stock-up effect in-store. On hero SKUs a BOGO often lifts sales to 2.5 to 4 times baseline during the promo (plan with your own category's past events). But much of that volume is future purchases pulled forward, so baseline sales can dip for several weeks after the promo ends while shoppers eat from the extra pack they stocked up.
- What shoppers notice
- Very visible. A 'free pack' message is the loudest promo format on the shelf. Plays well on digital ads and in-store signage. Brand recall during the promo is usually above any other mechanic.
- How easy it is to undo
- Trivially reversible. The promo runs for one to three weeks, then ends. No residual reference-price damage because the shopper remembers the normal shelf price.
- What your retailer does
- Loves the flash, dislikes the logistics. Double the inventory on the shelf for two weeks, halved margin rate during that period. Modern retailers including Tesco, Sainsbury's, and Aldi have progressively moved away from BOGOs in favor of simpler pricing since the mid-2010s.
- What it does to your profit
- Every promoted pack goes at half price, and you fund the free one. On most packs that is more than the pack earns you: in the worked example below, each promoted pack loses about $0.67. So a BOGO has to earn its place through the new shoppers and visibility it brings, rarely through the margin on the promoted packs.
Use BOGO when your category supports stock-up behavior (shelf-stable biscuits, canned goods, detergent, soft drinks, pet food), when you want a short sharp visibility hit, when the Stock Keeping Unit (SKU) has enough margin cushion (roughly 35 percent or more), when your market has no regulatory restriction on multi-buys, and when your retailer still rewards flash promotions with premium display.
You fund a cut of a specific percentage off the shelf price for the duration of the promo, and the retailer sets the promoted price. One pack costs less. Your shopper buys at something closer to a normal basket size.
- What happens to your sales
- Smaller stock-up spike. A 20 percent cut often lifts sales to somewhere around 1.4 to 2.2 times baseline (again, plan with your own past events). Less pantry loading by shoppers, less baseline erosion in the weeks after the promo ends.
- What shoppers notice
- Price-conscious shoppers notice straight away. Less dramatic on the shelf than BOGO, but digital shelf tags and loyalty-app notifications carry the message well. Usually produces better new-shopper acquisition per pound of promo spend than BOGO does.
- How easy it is to undo
- Reversible but carries a small reference-price risk. The longer the cut runs, the more it anchors the shopper to the lower number. A four-week window is usually fine; eight weeks or more starts to feel like a permanent cut.
- What your retailer does
- Simpler logistics. Most modern grocers prefer this format because it is less operationally intensive and gives them flexibility on promo duration. Fits cleanly inside the 'simpler pricing' strategies Tesco, Sainsbury's, and Morrisons have adopted since 2014.
- What it does to your profit
- Margin hit is proportional and predictable. In the worked example below, funding a 20 percent cut takes your profit per pack from $1.48 to $0.62, still positive on every sale, which holds as long as the cut you fund is smaller than what the pack earns you. Easier for Finance to model, easier for trade marketing to budget.
Use a straight cut when your category cannot be stocked up (fresh, short shelf life, or products shoppers do not want extras of), when you want controlled margin exposure, when you want the promo to run longer than two weeks, when your retailer operates in a market where BOGOs are regulated, or when your retailer has moved to a simpler-pricing strategy and rewards proportional cuts over flash.
5 questions to ask before you decide
Is this a stock-up-able category?
BOGO only works if shoppers can use or store the extra pack. For shelf-stable staples (biscuits, canned goods, detergent, soft drinks, pet food), BOGO drives real stock-up behavior. For fresh, chilled, or short-shelf-life products, the extra pack often goes to waste and the promo just trains shoppers to wait for the next deal. For categories where shoppers only buy one pack at a time (suncream, premium cosmetics, specialist medicines), BOGO produces almost no uplift beyond what a normal price cut would. Answer this question first, before any other. If the answer is no, stop walking the tree and use a straight cut.
Does your market or retailer currently restrict multi-buy promotions?
Regulation has shifted under this decision since the early 2020s. In the United Kingdom, government rules under The Food (Promotion and Placement) (England) Regulations 2021 restrict volume-price promotions on products classed as high in fat, salt, or sugar. Implementation has been phased over several years. Ireland, France, and parts of Scandinavia have followed with similar or stricter rules on selected categories. Several large grocers now also internally restrict BOGOs on own-label-heavy categories even where regulation allows them. If your SKU falls under a regulated category or your top retailer has a BOGO-free corporate policy, a straight cut is your only realistic option.
What share of the uplift will be genuinely new (the net share of uplift) rather than future purchases pulled forward?
This is the question that kills most BOGOs when the math is done properly. The net share of uplift is net incremental volume divided by the uplift: of the extra units above normal sales, the share that was genuinely new. On a hero SKU, much of a BOGO's uplift tends to come from shoppers who would have bought anyway, just buying earlier or buying more, and only part of it is genuinely new (new shoppers, new usage occasions, trade-up from private label). A straight cut usually keeps more of its uplift as new volume, because the smaller stock-up signal produces less pantry loading. Your own category's past events are the place to read both numbers. If your net share of uplift on BOGO is below 40 percent in your category, the math rarely works.
Is your SKU margin high enough to absorb a near-zero-margin second unit?
Do this sum on the money you are paid, never on the shelf price. Take a pack that earns you about half of what you are paid outside promotions, as in the worked example below: if you fund the whole free pack, every BOGO pack loses money, because half the shelf price is more than the pack earns you. On a thinner pack the loss per pack is bigger still. Run the math on both options at your real cost and contribution, and on the funding you are actually putting in. If your margin is below roughly 35 percent on the promoted SKU, a straight cut almost always produces better promotional ROI.
Does your top 3 retailer mix still reward flash promotions with premium display?
Some retailers reward brands that bring big visible promo events, with in-store flash, bold signage, end-of-aisle displays, and feature-ad participation. These retailers still prefer BOGOs and will give you premium visibility in exchange. Others have moved to simpler pricing strategies and reward brands that support their everyday-low-price story with proportional cuts. Ask your key account manager which bucket each of your top three retailers falls into. Size your answer to the retailer, not to the brand.
Walk these 5 questions in order
A YES on any question takes you straight to the verdict on the right. A NO sends you down to the next question. Order matters. Earlier questions carry more weight than later ones.
Worked exampleOne concrete scenario, walked through the tree
One concrete scenario, walked through the tree
Same biscuit brand used in the earlier two playbooks. Your 300g hero pack sits on the shelf at $4.29. To judge a promotion, start from what you are paid for a pack outside promotions: after the retailer's share and your everyday trade terms (about 7.5 percent of your invoice price, leaving out your promotion budget, which is the money this decision spends), that is about $2.98 (the $2.59 on the other pages also had the promotion budget taken off). It costs $1.50 to make and deliver, so a normal pack earns you $1.48. Baseline velocity at your top retailer is roughly 1,000 packs a week. You have a promotional slot to fill next quarter. The retailer is flexible on format but wants a commitment by end of week. Your two options are a 2‑week BOGO, where the shopper pays $4.29 for two packs ($2.145 each), or a 4‑week 20 percent price cut, which puts the pack at about $3.43 if the retailer passes your funding through in full. In both cases you fund an allowance equal to the whole shopper discount on every pack sold on deal, so the retailer keeps its usual cash margin; the deal price itself is the retailer's call.
- Node 1YESIs this a stock-up-able category (shelf-stable, multi-pack friendly)?
Biscuits are a classic shelf-stable stock-up category. Shoppers will happily take the extra pack home and eat from it over the following weeks. Move to Q2.
- Node 2YESDoes regulation and retailer policy allow BOGOs on your SKU?
Assume your SKU is not in a regulated high-fat-sugar-salt class in your market and your top retailer allows multi-buy formats. Move to Q3.
- Node 3NODo you expect a net share of uplift above 40 percent, meaning more than 40 percent of the extra units genuinely new (new shoppers or new occasions)?
This is where the decision flips. Based on your category's historical promo data, roughly 65 percent of BOGO uplift on the hero pack is future purchases pulled forward, so only 35 percent is genuinely new, a net share of uplift of 35 percent. That is below the 40 percent threshold. **Stop walking the tree. Use a straight price cut.**
- Node 4Not reachedIs your promoted SKU margin at or above 35 percent?
Q3 produced the verdict. For completeness: a normal pack earns you about half of what you are paid for it, comfortably above the 35 percent floor, so the margin question would have passed. Passing it does not make the BOGO pay: at half price, every promoted pack still loses money when you fund the free pack. The net share of uplift is what decided it here.
- Node 5Not reachedDoes your top 3 retailer mix still reward flash promotions with premium display?
Not reached. For completeness: the retailer in this example has been moving away from flash promotions since 2014, so Q5 would have pushed toward the cut even in a parallel world where Q3 and Q4 both passed.
The verdict: use the 4‑week 20 percent price cut. Run the numbers side by side, on the money you are paid.
On the BOGO option, two weeks of promo at 3 times baseline sells 6,000 packs against a 2,000‑pack baseline, so 4,000 extra packs. At a net share of uplift of 35 percent (this example's assumption; read yours from past events), only about 1,400 of them are genuinely new, worth about $2,070 at the $1.48 a normal pack earns you. The rest are shoppers buying earlier or buying more, and you will see much of that as a dip in sales over the following weeks. Against that, you fund the free pack on every one of the 6,000 packs sold on the deal: $2.145 each, about $12,870. The BOGO leaves you about $10,800 worse off than running no promotion. If the retailer instead keeps its 25 percent of the deal price, you fund three‑quarters of the cut and the loss shrinks to about $7,590, still a loss.
Now the straight 20 percent cut. Four weeks of promo at 1.8 times baseline sells 7,200 packs against a 4,000‑pack baseline, so 3,200 extra. Roughly half of them (1,600 packs) are genuinely new, a net share of uplift of about 50 percent (again this example's assumption), worth about $2,360. Funding the cut costs you $0.86 on each of the 7,200 promoted packs, about $6,180, so each promoted pack still earns you $0.62, lower than the normal $1.48 but positive on every sale. The cut leaves you about $3,820 worse off than no promotion, or about $2,270 if the retailer keeps its 25 percent of the deal price.
So neither option pays for itself on your own money, and the cut loses far less: about $3,820 against about $10,800. Most of the cost in both is the discount on packs that were not genuinely new, and the BOGO's discount is two and a half times deeper. A promotion that loses money has to earn its place some other way, by winning new shoppers, holding your display space or answering a competitor, so name that job before you book the slot and pick the mechanic that does it for the least money. Here that is the cut. It also wins on shopper understanding (no mental gymnastics about pack‑pair math) and on retailer fit with modern grocery pricing strategies. Save the BOGO slot for a different situation where the flash mechanic does work the margin math alone cannot, such as a new‑product launch trial or a hero‑SKU visibility play in a category where you genuinely need to interrupt the shopper.
Tesco 2014: the year a retailer made BOGOs unfashionable
In September 2014, Tesco announced its biggest change of direction in twenty years. Under new Chief Executive Dave Lewis, the United Kingdom's largest grocer launched a program it called 'Simpler, Long‑Term Pricing'. One of the first moves under the program was to significantly reduce the frequency of buy‑one‑get‑one‑free and deep multi‑buy promotions on food.
The reasoning was direct. Tesco's own shopper data, and research from its commercial team, showed that the BOGO‑heavy promo calendar was training shoppers to wait for deals, eroding trust in the everyday shelf price, and producing lower average basket size than a simpler everyday‑low‑price model. Lewis's early public communications framed the change as restoring shopper trust rather than cutting costs.
Share briefly dipped as shoppers adjusted. Some BOGO‑addicted shoppers migrated temporarily to Asda and Sainsbury's. Basket size then stabilised at higher levels because shoppers bought what they actually needed instead of what was on multi‑buy. Profit per transaction improved. By 2016, Tesco's underlying operating margin had started to recover from its 2014 low.
Other UK grocers followed. Sainsbury's announced a similar 'simpler pricing' move in 2016 under Mike Coupe, cutting BOGO‑style offers and moving to targeted digital promotions. Morrisons followed. By 2018, BOGO had gone from the default UK promotional mechanic to a selectively‑used format.
Regulation then formalised the shift. The Food (Promotion and Placement) (England) Regulations 2021 restricted volume‑price promotions on products classed as high in fat, salt, or sugar. Implementation has been phased across the first half of the decade. Ireland, France, and Norway have introduced similar or stricter rules on selected categories. BOGO, as a default promotional mechanic for packaged goods in Europe, is in steady retreat.
The Tesco pivot is the clearest signal any commercial team should need that BOGO is not a reflex default in 2026. A mainstream retailer, with access to more promo-level data than any single brand has, concluded that BOGOs were destroying its own Profit and Loss. The math has not changed since. Where BOGO still wins is in very specific situations: true stock-up-able categories, high-margin Stock Keeping Units, markets without regulatory restrictions, and retailers that still reward flash with premium display. Everywhere else, the straight cut wins on shopper understanding, baseline protection, and absolute profit. Question 3 (net share of uplift) and Question 4 (margin) in this guide are the two that catch most of the BOGO ideas before they reach the retailer.
Run these before you commit
- Trade Promotion OptimizationPromo ROI CalculatorModel both options against your baseline velocity, your cost, and your net share of uplift assumption (the share of the extra units you expect to be genuinely new). The tool returns promotional ROI for each option side by side so the margin math is not a judgement call.Open the tool
- PricingPrice Elasticity CalculatorProject the uplift a straight percentage cut would deliver at your SKU's specific price sensitivity. Use the output as the input to the promo ROI calculator for Option B.Open the tool
- PricingBreak-Even CalculatorFor each option, see how much volume you need to make back the margin sacrificed. If the required uplift is above what your category has ever delivered, the option fails before it starts.Open the tool
The lessons behind this guide
- Trade Promotion Optimization · Lesson 1Part of the coursePromo ROI FundamentalsThe single number that tells you whether a trade promotion is making you money or destroying it.
- Trade Promotion Optimization · Lesson 2Part of the courseSource of VolumeWhere your promo sales actually come from: new shoppers, more usage, switching from rivals, or stockpiling.
- Trade Promotion Optimization · Lesson 3Part of the courseBaseline vs. IncrementalTelling apart the sales you would have made anyway from the sales the promo actually added.
- Trade Promotion Optimization · Lesson 4Part of the coursePromo Performance GridSorting every promo into scale it, hold it, fix it, or cut it. The four-box verdict every trade plan should clear.
- Trade Promotion Optimization · Lesson 5Part of the coursePromo MechanicsChoosing between price cuts, multibuys, displays, and features. Which one fits which goal, and which to retire.
- Trade Promotion Optimization · Lesson 6Part of the coursePromo Investment AllocationSplitting a fixed promotion pot across retail customers, so the last dollar spent at each one earns about the same.
- Trade Promotion Optimization · Lesson 7Part of the coursePromo OptimizationThe ten things you can change on a promo plan before signing the year-end deal.
- Trade Promotion Optimization · Lesson 8Part of the coursePromo Calendar OptimizationSpacing, depth, and rhythm. The promo calendar as the operating system for your trade plan.
- Pricing · Lesson 1Part of the coursePrice Elasticity of DemandHow much your sales drop when you raise the price. The single most useful number in pricing.
- Pricing · Lesson 2Part of the courseBreak-Even Sales AnalysisHow much volume you can lose on a price rise before it starts costing you money.
- Pricing · Lesson 3Part of the coursePrice ThresholdsWhy round numbers like $2.00 and $5.00 act as price barriers, and how to price around them.
- Pricing · Lesson 4Part of the courseWillingness to PayWhat your shoppers actually think your product is worth, and how much room you have to charge more.
- Pricing · Lesson 5Part of the courseBrand Strength and PricingHow much extra you can charge thanks to your brand, and how to keep that premium without losing it.
- Pricing · Lesson 6Part of the courseCross-Price ElasticityWhen you raise the price on one product, what happens to your other products and to the rest of the category.
- Pricing · Lesson 7Part of the courseCompetitive PositioningWhere your product sits on the price-versus-value map, and where it should move to next.
- Pricing · Lesson 8Part of the courseParabola AnalysisFinding the exact price point that gives you the most profit, not just the most sales or the highest margin.
- Pricing · Lesson 9Part of the coursePricing War GamingThinking through how your competitors will react before you change your price, so you do not get caught out.
How often, and what should make you re-decide
Re-walk this guide once a year, and again whenever your market's promo regulation or your top retailer's promo framework changes. Three of the five questions (regulation, retailer mix, net share of uplift) can shift inside a single year.
- Your market or one of your top retailers announces a policy change on multi-buy promotions (a government rule, a retailer simpler-pricing initiative, an own-label BOGO ban). Re-check Q2 immediately.
- Your SKU's contribution margin changes by more than 3 percentage points up or down. Re-check Q4, since the 35 percent floor may have crossed.
- Baseline forecasting for the SKU shows persistent post-promo baseline erosion above 5 percent for more than two cycles. Re-check Q3, since your true net share of uplift is lower than assumed.
- A top 3 retailer cuts its allocated promo display slots by more than 20 percent. Re-check Q5, since the flash premium may no longer exist.
- A new multi-buy mechanic enters your category from a rival brand (for example buy-2-get-3rd-half-price, or a loyalty-card-exclusive bundle). Re-walk the whole guide, since the competitive context just changed.
See the full Trade Promotion Optimization and Strategic Pricing course
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