Supplier Price Increases: How to Spot Them Early
Nobody sends a letter announcing that your butter has gone up. Price rises arrive one invoice at a time, in amounts too small to argue about, spread across a year so they never look like a pattern. By the time you notice, you have been selling at the wrong price for months. This guide covers why increases hide so well, the pack-size trick that disguises a rise as a flat price, a worked example of what 6% on one ingredient really costs, and how to build a quarterly review that takes an hour.
Why price rises go unnoticed
Supplier price increases almost never arrive as an announcement. They arrive one invoice at a time, in the middle of a delivery, on a day when you are already behind. Nobody sends a letter saying "we are putting your butter up 6%" — the number on the docket is simply different from the number on the last docket, and the last docket is in a box under the desk.
Three things make them genuinely hard to spot. The comparison is against a figure you cannot see. To know that flour went up you would have to remember what it cost last month, per unit, for the same pack. Almost nobody does. Individual rises look trivial. Ten pence on a bag of sugar is not worth a phone call, which is precisely why it works: a supplier can move several lines by small amounts and no single change is large enough to trigger a reaction. Rises are staggered. Butter in March, flour in May, packaging in July. Each one lands in a different week and none of them feels like a pattern.
The result is a slow, invisible erosion. Your recipe costs are still the ones you calculated when you set your prices, so your margin looks fine on paper while the money in the bank quietly stops matching it. This is margin drift, and it is almost always discovered months late, usually when someone finally recosts a recipe and gets a shock.
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The pack-size trick
The most effective price increase is the one that does not change the price. A supplier holds a line at £4.20 — genuinely, honestly, the invoice says £4.20 exactly as it did last quarter — but the pack has gone from 500g to 450g.
Per pack, nothing has happened. Per 100g, the price has moved from 84.0p to 93.3p. That is an 11.1% increase hiding inside a price that did not change. If you compare invoices line by line, you will never see it. If you compare cost per 100g, it is unmissable.
This is why the unit of comparison matters more than the frequency of comparison. Someone checking invoices weekly but comparing per pack will miss a pack-size change entirely. Someone checking quarterly but comparing per 100g will catch it the first time it appears. The same applies to case sizes that drop from 12 to 10, to bottles that go from 1 litre to 900ml, and to any product where the headline price is the thing you have been trained to look at.
Pack size is the most common disguise but it is not the only one. Watch also for a delivery charge that appears on a previously free account, a minimum order value that rises so you carry more stock than you need, an early-settlement discount that quietly stops being applied, and a "standard" line being substituted for the branded one you actually specified. None of these change the unit price and all of them change what you pay per gram of usable ingredient.
What a 6% rise on one ingredient actually costs
Abstract percentages are easy to shrug at, so here is a worked example. Take a bakery buying butter at £6.50/kg. The supplier raises it 6%, to £6.89/kg — an increase of 39p per kilogram, which sounds like nothing. Below is what that single change does across a modest product range. (These are illustrative figures, not survey data; use your own volumes to get your own answer.)
Just over £24 a week, from one ingredient, moving by an amount no one would query. Annualised, that is roughly £1,250 of margin gone, with no change to your prices, your recipes or your sales. Nothing on your P&L will say "butter" — it will just say that ingredients cost a bit more than they used to.
Now consider that a bakery of this size might buy forty or fifty distinct ingredients. If a handful of them move by similar amounts in the same year — which is entirely ordinary — the effect is several thousand pounds and two or three percentage points of gross margin. That is the difference between a good year and a flat one, accumulated in increments of less than a penny.
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How to review suppliers quarterly
You do not need a procurement function. You need one repeatable hour, four times a year, done the same way each time so the comparisons are valid.
- Pull the per-unit price for every ingredient, not the per-pack price. Per 100g or per kg for solids, per 100ml or per litre for liquids. This is the step that makes everything else work; skip it and you are auditing packaging, not price.
- Compare against the same date last quarter. Not against your last order, which may have been a promotional price or a different pack.
- Rank by percentage movement, not by pence. A 14% rise on a £3 spice matters more to your future than a 2% rise on a £40 sack, because the 14% supplier has shown you what they are willing to do.
- Roll it up by supplier. One line moving is noise. One supplier moving eight lines by an average of 9% while another moved two by 1% is a decision waiting to be made.
- Recost the ten recipes that carry your volume. Not all of them — the ten that actually pay the rent.
- Write down what you will do before the next review. Renegotiate, re-tender, substitute, reformulate or reprice. A review with no decision at the end is a hobby.
The reason this works quarterly rather than annually is that a year is long enough for two or three rises to compound on the same ingredient, and long enough that you can no longer tell which one you were reacting to. It is also short enough to stay in living memory: in April you can still remember whether January's flour was a promotional price, and by December you cannot. Put the four dates in the diary now, and treat the hour as non-negotiable in the way you treat a delivery slot.
What FoodCore records so you do not have to
Supplier price history sits on the Growth plan (£40/month inc. VAT, or £400/year) and on Core (£65/month inc. VAT, or £650/year), alongside the cost calculator, stock control, production runs and the orders diary. Essentials (£25/month inc. VAT, or £250/year) covers recipes, ingredients, allergens, labels, shelf life and date labels, bulk editing, customer records and shopping lists. All three start with a 7-day free trial and no card is required.
Every price change is recorded automatically. You do not have to remember to log anything or keep old invoices. When an ingredient price changes, the previous value and the date are kept, so the history builds itself as you work. That is the whole point — a price history you have to maintain by hand is one you will stop maintaining by March.
Biggest movers over any date range. Choose a period — last quarter, last year, since you set your prices — and see which ingredients moved most in that window. This turns "everything feels more expensive" into a short, specific list you can act on in an afternoon.
A per-supplier league table. Individual ingredients are ranked, and so are suppliers, by percentage movement across the lines you buy from them. This is the view that answers the question worth asking: not "did butter go up" but "is this supplier drifting?" A merchant whose whole basket has moved 9% while a comparable merchant moved 1.5% is a re-tender conversation, and you now have the figures to open it with.
Comparison done per 100g. Because prices are normalised to a consistent unit rather than compared per pack, a pack-size change shows up as the price rise it really is. The 500g-to-450g switch described above appears as an 11.1% increase, not as a flat line.
What to do once you have found one
Ask. The single most under-used response is a short email quoting the old per-unit price, the new one, and the percentage. Suppliers expect this from large accounts and are often surprised by it from small ones. Sometimes the rise is a national cost pass-through and the answer is no; sometimes it is a margin adjustment applied to accounts that were not paying attention.
Re-tender the basket, not the item. Getting a better price on one line is a small win. Moving a whole category is a real one, and the league table tells you which supplier's basket is worth quoting out.
Substitute where quality allows, and only where it does. A cheaper flour that changes your crumb is not a saving. A cheaper packaging supplier usually is. Be honest about which is which, and remember that any ingredient change means checking allergen data and updating labels before the product goes on sale.
Reprice deliberately. If cost has genuinely moved and cannot be absorbed, raise the price on purpose rather than letting the margin absorb it by default. A planned 20p rise on a scone is a decision. An unplanned 2.4-point margin loss is an accident.
One caveat worth stating plainly: software records what changed and shows you where it moved. It does not negotiate, does not tell you whether a rise is justified, and does not know your relationship with the merchant. It removes the excuse of not knowing — the judgement is still yours.
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Frequently asked questions
Why do supplier price increases go unnoticed?
Because they arrive one invoice at a time rather than as an announcement. Spotting a rise requires remembering what the same item cost per unit last month, which almost nobody does. Individual increases are also small enough not to be worth a phone call, and they are staggered across the year — butter in March, flour in May, packaging in July — so no single change looks like a pattern. The cumulative effect only shows up when someone finally recosts a recipe.
What is the pack-size trick and how do I spot it?
It is when a supplier holds the headline price but shrinks the pack. A line stays at £4.20 while the pack moves from 500g to 450g: per pack nothing has changed, but per 100g the price has gone from 84.0p to 93.3p — an 11.1% increase. The only reliable way to spot it is to compare per 100g, per kg or per litre rather than per pack. Anyone comparing invoice line to invoice line will miss it completely.
How often should I review supplier prices?
Quarterly is enough for most small food businesses, provided the review is done the same way each time. Compare per-unit prices against the same point in the previous quarter, rank by percentage movement rather than pence, roll the movements up by supplier, and recost the ten recipes that carry your volume. Reviewing more often adds little if the comparison is per pack; reviewing quarterly on a per-100g basis catches almost everything that matters.
How much does a 6% ingredient rise actually cost me?
More than the percentage suggests, because it applies to every unit you make. In a worked example on this page, butter rising 6% from £6.50/kg to £6.89/kg adds just over £24 a week across five products — roughly £1,250 a year from one ingredient, with no change to recipes, prices or sales. These are illustrative figures, so run them on your own volumes. The point is that increases too small to query are not too small to matter.
How does FoodCore track supplier price history?
Every ingredient price change is recorded automatically, with the previous value and the date, so the history builds itself as you work rather than needing to be maintained. You can then see the biggest movers over any date range you choose, and a per-supplier league table ranking suppliers by percentage movement across the lines you buy from them. Comparisons are made per 100g, so a pack-size change appears as the price rise it really is.
Which FoodCore plan includes supplier price history?
Supplier price history is on the Growth plan at £40/month inc. VAT (£400/year) and on Core at £65/month inc. VAT (£650/year), together with the cost calculator, stock control, production runs and the orders and collections diary. Essentials at £25/month inc. VAT (£250/year) covers recipes, ingredients, allergens, labels, shelf life and date labels, bulk editing, customer records and shopping lists. All plans include a 7-day free trial with no card required.
What should I do when I find a price increase?
Start by asking: a short email quoting the old per-unit price, the new one and the percentage is under-used and sometimes effective. Then consider re-tendering the whole basket from that supplier rather than haggling over one line, substituting where quality genuinely allows, and repricing deliberately if the cost cannot be absorbed. If you change an ingredient, check the allergen data and update labels before the product goes on sale.
Further resources
FoodCore is kitchen management software built for small UK food businesses. We handle recipe costing, Natasha's Law labels, allergen matrices, stock control and production planning.
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