Beverage margin usually leaks through unreviewed price changes, inconsistent pours, spoiled glasses, unrecorded drinks, invoice and POS errors, stock differences, sales-mix shifts and supplier-driven buying. A short monthly routine will surface most of them.
If beverage profit is lower than the sales suggest it should be, the cause is rarely one big mistake. It is usually several small leaks that each look harmless.
Here are eight places to look. Not every venue will have all of them, and most venues will have a few.
1. Prices that did not follow costs
A supplier raises a price. The invoice is paid, the stock goes on the shelf and the menu price stays the same, because changing it feels like a job for later. Repeat that a few times across a list and the margin has moved without anyone deciding it should.
Check: compare current invoice costs with the costs your menu prices were built on, wine by wine for your best sellers.
2. Pours that vary
A glass has a defined size, but a busy shift pours by feel. Even small, consistent over-pouring adds up across a month.
Worked example (illustrative figures). Suppose a $24 bottle is sold by the glass at $18 for a 150ml pour. At exactly 150ml, a 750ml bottle gives five glasses: $90 of sales, so product cost is about 26.7%. If the real pour drifts to 175ml, the same bottle gives about 4.3 glasses: roughly $77 of sales, and product cost rises to about 31%. The menu has not changed, but the margin has.
Check: weigh or measure a few real pours across different team members and shifts.
3. Open bottles that run out of life
By-the-glass wine is more exposed than bottle sales. A bottle that sits open for too long ends up discarded, and the cost of that wine is borne by the venue. Slow-selling glass wines are the usual culprits.
Check: note how often an open bottle is thrown away, and which wines it is.
4. Drinks that leave without being rung up
Staff drinks, tastings, comps and mistakes are all normal. The problem is when they are not recorded, because the stock goes down and the sales do not go up.
Check: see whether you have a simple, consistent way to record comps and tastings, so the difference between used and sold can be explained.
5. Invoice and POS errors
A wine entered at the wrong cost, a menu item linked to the wrong product, a price keyed incorrectly. These are easy to make and easy to miss, especially when there is no regular check.
Check: pick your top sellers and confirm the cost on file and the product linked in the POS are right.
6. Stock counts that do not reconcile
If the stock you should have, based on purchases and sales, differs from what is on the shelf, something is missing from your records. Sometimes it is a counting error. Sometimes it is one of the leaks above.
Check: count regularly and investigate differences rather than adjusting them away.
7. A sales mix that quietly shifted
Overall cost percentage can move simply because guests are buying different things. More premium bottles, fewer glasses, a popular new wine with a different margin: each changes the blended result without any individual price changing.
Check: look at what sold, not just the total, and ask whether the mix is moving in a way you want. See what your beverage sales reports should tell you.
8. Buying that follows the offer
A special deal on a case, a minimum order that is bigger than you need, or a supplier promotion can lead to stock the list did not call for. A discount on a wine that does not sell is not a saving.
Check: before accepting an offer, ask what role the wine plays on the list and how quickly it will realistically sell.
A simple monthly routine
You do not need a complex system. Once a month, set aside a short, protected slot to:
- Compare beverage sales and product cost, by category.
- Review gross profit in dollars as well as percentage.
- Check cost changes against menu prices for your top sellers.
- Count stock and investigate differences.
- Note open bottles discarded and any unrecorded drinks.
- Write down one decision and who will do it.
The decision matters most. A review that does not lead to action does not protect margin.
Common questions
How often should I check these?
A short monthly review catches most problems early. Pours and wastage are worth a closer look whenever you change your by-the-glass range or have new team members.
Do I need special software?
Not to begin. A spreadsheet and a consistent routine go a long way. Better data from your POS and stock system helps, but the habit matters more than the tool.
What if the numbers still do not add up?
That is a useful finding. A structured outside review can help trace where the difference sits and rank what to fix first.
Related service
Prices that protect margin without pushing guests away.
Gross profit, pricing structure and by-the-glass economics, read clearly.
See where your beverage program has room to earn more.
A concise written diagnosis with a commercial scorecard, priority findings and quick wins.
Talk through your venueThis article is general information for hospitality operators, not financial, legal or tax advice. Figures and examples are illustrative, and the right approach depends on the venue.