# When Google Ads Cannot See Your Sales, It Bids Blind

> Smart bidding learns from the conversions you feed it. When that signal breaks or is inflated, Google bids confidently in the wrong direction.

Canonical: https://thegrowthproject.com/blog/when-ads-cant-see-sales/

## Results

- **2 months** that one account recorded no sales in Google Ads while spend carried on
- **2.5–3×** daily impressions within two days of sales recording again
- **~15%** overstatement of sale value from sending GST and shipping
- **¼** of the conversion value Google saw came from phone calls

_From one ecommerce store; the same patterns turn up across the accounts we review._

**Field note, a pattern across ecommerce accounts.** Smart bidding is a learning system. It watches which clicks turn into sales and bids more for clicks like those. Feed it the wrong numbers and it learns the wrong lesson, with complete confidence. None of the problems below show up as an error in Google Ads.

## What we keep finding

**A purchase action that stopped recording.** A site update, a new plugin or a change to consent settings breaks the tag, and the account's main conversion goes quiet. Spend carries on. The bidding system, now working from no sales at all, keeps chasing a target it can't see. The fix is boring and essential: after any change to the site, checkout or tracking, check that conversions are still arriving within 48 hours.

**Consent settings built for another country.** European privacy rules need a consent banner. Copying those defaults onto an Australian site with no banner means the "denied" setting never flips, and ad conversions are quietly dropped. Settings should match where your customers are.

**Phone calls counted as sales.** A "calls from ads" action marked as a primary goal, with a high value per call, can end up as a large share of reported conversion value. Google then optimises for phone calls you can't tie to a sale.

**Revenue that isn't revenue.** Conversion values sent with GST and shipping included overstate what each sale is worth to you, sometimes by 15% or more. It looks like a better return than you are getting.

**An aggressive target too early.** Return-on-spend targets need a few dozen conversions before they mean anything. Set one on a thin signal and the campaign throttles itself.

## What we do about it

- Confirm one primary purchase goal is recording, and make everything else secondary.
- Send conversion values without GST and shipping, so reported return matches real money.
- Set consent defaults by region.
- Hold bid targets loose until there is enough data, and change them in small steps.

Bad tracking costs twice: once in wasted spend, and again in good campaigns starved of budget because they look worse than they are. That's why tracking is the first thing we check in a [Google Ads audit](/growth/google-ads-audit/), why we built a [tracking kit](/growth/conversion-tracking/), and why our [growth page](/growth/) argues for joining ad data with your real sales.