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. Industry meta-analyses of packaged-goods promotions find most buy-one-get-ones deliver promotional Return on Investment (ROI) between minus 10 and plus 10 percent once pulled-forward baseline is netted out, while straight cuts typically come in meaningfully above that range.
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. A 2.5 to 4 times baseline uplift is typical on hero SKUs during the promo. But most of that volume is future purchases pulled forward. Baseline typically dips 10 to 20 percent for 4 to 8 weeks after the promo ends because shoppers are eating 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 favour of simpler pricing since the mid-2010s.
- What it does to your profit
- Margin on the promoted packs drops to roughly zero. A 42 percent margin pack effectively becomes zero margin for every second pack sold under the BOGO, once funding split is accounted for. Works only if enough of the uplift is truly incremental rather than pulled-forward baseline.
Use BOGO when your category supports stock-up behaviour (shelf-stable biscuits, frozen, 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 cut the shelf price by a specific percentage for the duration of the promo. 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 1.4 to 2.2 times baseline uplift is typical for a 20 percent cut. 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. A 20 percent cut on a 42 percent margin pack drops margin to about 27 percent. You still keep positive margin on every sale. 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, frozen, detergent, soft drinks, pet food), BOGO drives real stock-up behaviour. 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.
How much of the uplift will be truly incremental rather than pulled-forward baseline?
This is the question that kills most BOGOs when the math is done honestly. Industry meta-analyses find that 60 to 80 percent of BOGO uplift on hero SKUs is shoppers who would have bought anyway, just buying earlier or buying more. Only 20 to 40 percent is truly incremental (new shoppers, new usage occasions, trade-up from private label). A straight cut typically delivers 40 to 60 percent truly incremental because the smaller stock-up signal produces less pantry loading. If your incrementality is below 40 percent on BOGO in your category, the math rarely works.
Is your SKU margin high enough to absorb a near-zero-margin second unit?
On a 42 percent contribution margin SKU, a BOGO drops the effective per-pack contribution to roughly zero once the manufacturer share of the 'free' pack is netted. On a thinner 25 percent margin SKU, BOGO takes you into negative margin territory on every second unit sold. Run the math on both options at your real cost and contribution. 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 sells at $4.29 with a 42 percent contribution margin (per-pack cost $2.49, contribution $1.80). 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, effective per-pack price $2.145 for the shopper, or a 4-week 20 percent price cut, shelf price $3.43.
- 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 more than 40 percent of the uplift to be truly incremental (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 pulled-forward baseline, only 35 percent is truly incremental. 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: the SKU's 42 percent contribution margin is comfortably above the 35 percent floor, so the margin question would have passed. Incrementality is what killed the BOGO on paper, not margin.
- 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 BOGO option, two weeks of promo at 3 times baseline produces 6,000 packs sold versus a 2,000-pack baseline over the same window. The effective per-pack price the shopper pays is $2.145, which is below your $2.49 unit cost. Once funding splits with the retailer are accounted for, the manufacturer's contribution per promoted pack lands close to zero on average, and meaningfully negative if the split favours the retailer. The promo-window contribution comes out roughly break-even at best. Then you pay the hangover: shoppers who stocked up reduce their baseline purchases by about 15 percent for the following 6 weeks, which costs you roughly 900 packs of baseline volume at $1.80 contribution each, or about $1,600 in lost margin. Net incremental profit from the BOGO lands at a small loss to modest break-even. Promotional ROI, measured as incremental Gross Profit divided by promotional investment, ends up between minus 5 and plus 5 percent. This matches industry meta-analyses of BOGO outcomes in mainstream packaged-goods categories.¹
Now the straight 20 percent cut. Four weeks of promo at 1.8 times baseline produces 7,200 packs versus a 4,000-pack baseline. Your shelf price is $3.43, your unit cost is still $2.49, so contribution per pack is $0.94, lower than the full-price $1.80 but still positive on every sale. Incremental volume versus the no-promo counterfactual is 3,200 packs, and roughly 50 percent of that (1,600 packs) is truly new rather than pulled forward. Contribution on the incremental units is about $1,500. The hangover is much smaller because shoppers did not load their pantries: a 5 percent baseline dip for 4 weeks, roughly 200 packs at $1.80, or $360 in lost baseline margin. Net incremental profit lands around $1,100 to $1,500. By the standard definition of promotional ROI (incremental gross profit divided by the margin given up on promoted packs over baseline), the straight cut lands comfortably in positive territory, in the range published industry studies identify as the top quartile of FMCG promotional outcomes.¹
The cut wins on incremental profit. The cut wins on promotional ROI. The cut wins on shopper understanding (no mental gymnastics about pack-pair math). The cut wins 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 programme it called 'Simpler, Long-Term Pricing'. One of the first moves under the programme 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 (incrementality) 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 OptimisationPromo ROI CalculatorModel both options against your baseline velocity, your cost, and your incrementality assumption. 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 incremental volume 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 1Free previewPromo ROI FundamentalsThe single number that tells you whether a trade promotion is making you money or destroying it.
- Trade Promotion Optimization · Lesson 2Free previewSource of VolumeWhere your promo sales actually come from: new shoppers, more usage, switching from rivals, or stockpiling.
- Trade Promotion Optimization · Lesson 3Sign up to unlockBaseline vs. IncrementalTelling apart the sales you would have made anyway from the sales the promo actually added.
- Trade Promotion Optimization · Lesson 4Sign up to unlockPromo Performance GridSorting every promo into BEST, GOOD, REVIEW, or STOP. The four-box scorecard every trade plan should clear.
- Trade Promotion Optimization · Lesson 5Sign up to unlockPromo MechanicsChoosing between price cuts, multibuys, displays, and features. Which one fits which goal, and which to retire.
- Trade Promotion Optimization · Lesson 6Sign up to unlockCustomer Value AssessmentA profitability lens on your top retailers, so you can see where promo investment earns its return.
- Trade Promotion Optimization · Lesson 7Sign up to unlock13-Lever TPO OptimizationThe full set of 13 things you can change on a promo plan before signing the year-end deal.
- Trade Promotion Optimization · Lesson 8Sign up to unlockPromo Calendar OptimizationSpacing, depth, and rhythm. The promo calendar as the operating system for your trade plan.
- Pricing · Lesson 1Free previewPrice Elasticity of DemandHow much your sales drop when you raise the price. The single most useful number in pricing.
- Pricing · Lesson 2Free previewBreak-Even Sales AnalysisHow much volume you can lose on a price rise before it starts costing you money.
- Pricing · Lesson 3Sign up to unlockPrice ThresholdsWhy round numbers like $2.00 and $5.00 act as price barriers, and how to price around them.
- Pricing · Lesson 4Sign up to unlockWillingness to PayWhat your shoppers actually think your product is worth, and how much room you have to charge more.
- Pricing · Lesson 5Sign up to unlockBrand Power and Pricing HeadroomHow much extra you can charge thanks to your brand, and how to keep that premium without losing it.
- Pricing · Lesson 6Sign up to unlockCross-Price ElasticityWhen you raise the price on one product, what happens to your other products and to the rest of the category.
- Pricing · Lesson 7Sign up to unlockCompetitive PositioningWhere your product sits on the price-versus-value map, and where it should move to next.
- Pricing · Lesson 8Sign up to unlockParabola AnalysisFinding the exact price point that gives you the most profit, not just the most sales or the highest margin.
- Pricing · Lesson 9Sign up to unlockPricing 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, incrementality) 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 incrementality 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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