Why online stores lose sales in Google before Black Friday — and it isn't the budget

Published: October 16, 2026 · 5 min read · By Septminor

When someone searches Google for a specific product, the first thing they often see is not websites but product cards: a photo, a name, a price and the store's name. These are Google Shopping ads. In November this is exactly where shoppers compare prices before Black Friday (November 27 this year) and Cyber Monday (November 30).

And this is exactly when many stores run into an unpleasant surprise: discounts are live on the site, the ad budget is set, yet some products simply stop showing. Nobody switched the ads off. Google did it on its own.

How a store loses impressions without noticing

Google doesn't take product information straight from your site. It uses a separate file listing all your products, prices and stock. That file is uploaded to Google Merchant Center, the account through which a store connects to Shopping ads. Google then regularly compares the file with what it sees on the site.

If the price on the site differs from the file, Google disapproves the product and it stops appearing in ads. Google itself warns that persistent price mismatches can lead to the whole store account being suspended. After a fix, Google rechecks the products, which takes from a few hours to a few days. For a sale that lasts one to four days, that can mean the product spends the best days of the year outside your ads.

Why it happens most often on Black Friday

In a normal month, store prices rarely change. Before Black Friday they change in bulk, often overnight and across hundreds of products at once. The site already shows the new prices while the file for Google updates a few hours later. Those few hours are enough for Google to spot the mismatch.

The second typical cause: a plugin or script adds the discount to the page after it has loaded. The shopper sees the discount, but Google, by its own explanation, reads the price from the page code and sees the old one. For Google that is the same mismatch.

The third: stock runs out. Ads keep sending people to a product that is gone, and you pay for clicks that can't become purchases.

One more detail many owners don't know: Google doesn't always show the struck-through old price and the sale badge. The discount has to be genuine — between 5% and 90% off the regular price that applied before the sale. Raising prices a week before the sale and then "cutting" them back won't work.

Automated campaigns spend faster in November

Many stores now advertise through Performance Max. It's a campaign that shows your ads across Search, YouTube, Gmail, Maps and Google's partner sites at once and decides by itself how to split the money. When everything is set up correctly, that's convenient.

But the automation learns from whatever Google counts as a sale. If sales are tracked wrongly — say, adding to cart counts as a purchase, or each order is counted twice — the campaign diligently looks for the wrong people. In a normal month that's just inefficient. In the week when every impression is the most expensive of the year, it eats the budget fast.

Signs your store is at risk

• Merchant Center has disapproved products and nobody can explain why.
• You've seen your Google ad with the old price after already changing it on the site.
• Sale prices get switched on manually the night before the sale.
• Discounts on the site are calculated by a separate plugin or module.
• The number of Google sales in reports doesn't match real orders.
• Nobody watches the ads at weekends or during the sale days themselves.

If you recognised two or three of these, part of your November Google sales risks going to competitors.

Why this isn't a one-button fix

It's several connected tasks. Making prices and stock on the site and in Google update in sync. Preparing sale prices according to Google's rules so products aren't disapproved and the discount shows in ads. Checking that Google sees every purchase correctly. Planning how and when prices change before the sale. And during the sale itself, checking disapproved products and spend daily, not on Monday after it's all over.

Mistakes here cost money exactly when demand peaks, and fixing them on the fly is too slow because of Google's rechecks. So the store is worth preparing now, in October or early November. Why ads should start early in the first place is covered in our article on getting ready for Black Friday 2026.

We set up Google Shopping and Merchant Center end to end: we create and configure Merchant Center, get the product file into shape so it doesn't trigger suspensions for policy mismatches, and run the campaigns. We've worked with stores selling phone parts, sportswear, gadgets and other products, and the approach works for any niche.

Sources: Google: mismatched product price, Google: sale price annotations, Google: about Performance Max campaigns.