Google Ads not converting, despite spend continuing, comes down to one of seven causes in the vast majority of Australian SMB accounts. Here they are, in order of frequency.
1. Broken or Misconfigured Conversion Tracking
This is the most common cause. 70% of Australian SMB accounts have broken or misconfigured conversion tracking. The problem is that broken tracking does not produce an error. It produces plausible-looking data that is wrong.
What it looks like
CPA appears stable but has no relationship to actual customer acquisition. Conversion counts are inconsistent with sales data. GA4 shows different numbers to Google Ads for the same period.
How to diagnose
Check Goals → Conversions → Summary. Look at: conversion action type (is it a purchase or lead — or a micro-conversion like page view?), counting method (One vs Many), and primary vs secondary classification. Compare the Google Ads conversion count for the past 30 days against your actual sales or lead records for the same period.
How to fix
Identify whether the issue is the conversion action type, counting method, or the tag itself. Tag misfires require a technical fix. Misconfigured action type or counting method can be corrected in Google Ads settings without a developer. Assessment window: tracking fixes improve data quality immediately, but bid algorithm re-calibration takes 3–4 weeks.
A full independent Google Ads audit checks tracking integrity as the first structural foundation — broken conversion tracking caps the overall account grade at 30 until resolved. The dedicated conversion tracking audit covers the 6 criteria checked and the integrity score that determines whether the cap applies.
2. Wrong Bid Strategy for Current Data Volume
Target CPA and Target ROAS require conversion history to function. Without enough data, the algorithm cannot learn.
What it looks like
CPA is highly volatile — good week, terrible week, good week. Impression share fluctuates. Some days the campaign spends its full budget; others, spend is very low.
How to diagnose
Check campaign conversion volume for the past 30 days. Target CPA requires at least 30 conversions in the period. Below this threshold, the algorithm is learning from insufficient signal.
How to fix
For campaigns below the threshold, move to Maximise Conversions while building conversion volume. Return to Target CPA once the threshold is met. Assessment window: bid strategy changes require a minimum 21-day assessment window.
3. No Negative Keywords — Spend Going to the Wrong Searches
What it looks like
High click volume, low conversion rate. Cost-per-click is competitive but the CPA is significantly above benchmark.
How to diagnose
In Google Ads, go to Keywords → Search terms. Filter for the past 90 days. Sort by cost, descending. Work through the top 50 search terms and classify each by intent: Transactional, Commercial, Informational, Navigational. If more than 20% of spend is on Informational or Navigational terms, negative keyword addition will have a measurable impact on CPA.
How to fix
Add the highest-spend Informational and Navigational terms as negatives. Start with exact match for confirmed irrelevant terms, then phrase match for patterns ('how to', 'DIY', 'free', 'apprentice'). Assessment window: measurable within 7 days.
4. Landing Page Mismatch — Traffic Going to the Wrong Page
What it looks like
Acceptable CTR but low conversion rate. High bounce rate. The most common cause: the primary landing page is the homepage.
How to diagnose
In Google Ads, check the landing pages column for each campaign. If the primary URL is your homepage for non-branded campaigns, a mismatch is the likely cause.
How to fix
Identify a more relevant landing page or create one. The page should state the offer in the headline, match the search intent explicitly, and have a clear and immediate call to action. Assessment window: measurable within 7–14 days.
5. Ad Relevance and Quality Score Problems
What it looks like
Impression share is low despite competitive bids. CPC is higher than expected. RSA asset ratings show 'Poor' across ad groups.
How to diagnose
Check the Ads column for RSA asset ratings. Check the Keywords tab for Quality Score — broken into expected CTR, ad relevance, and landing page experience. A score of 5 or below on ad relevance suggests the ad copy is not closely matched to the keyword.
How to fix
Ensure the target keyword appears in at least two headlines of each RSA. Create ad groups around tighter keyword themes. Assessment window: Quality Score changes are measured over 7–14 days.
6. Brand and Generic Keywords Mixed — Data Distortion
What it looks like
An account-level CPA that appears acceptable, but individual campaign performance varies wildly. The brand campaign converts at $12 CPA and the generic campaign at $85 CPA — but the blended figure reports $40 CPA.
How to fix
Create a dedicated brand campaign with exact match on brand terms. Exclude brand terms from generic campaigns using negative exact match. This produces an accurate picture of both and allows each to be optimised independently. Assessment window: measurable within 14–21 days.
7. Insufficient Data — Account Too New or Spend Too Low
What it looks like
Performance is inconsistent in ways that don't correlate with any identifiable change. The account is in 'Learning' status. Week-to-week variation is high.
How to fix
Increase budget temporarily to accelerate the learning phase. Or move to Maximise Clicks while building conversion volume. Avoid significant campaign changes during the learning phase — each change resets the learning period. Assessment window: campaigns with 5+ conversions per week typically exit learning within 2–3 weeks.
Google Ads Low Conversions Fix — Summary Checklist
- Conversion tracking: confirmed active, correct type, correct counting method, primary actions only.
- Bid strategy: matched to conversion volume. Smart Bidding only above threshold.
- Search terms: negative keywords applied. Irrelevance rate below 20% of spend.
- Landing pages: campaign-specific pages used. Homepage not the default for non-branded campaigns.
- Ad quality: RSAs rated Good or Excellent. Keywords present in headlines.
- Brand separation: branded and generic campaigns separated.
- Data volume: conversion volume meets Smart Bidding threshold. Learning phase monitored.
viaCMO detects 5 of these 7 causes automatically in the free 25-point health check — read-only access, no credit card, results in 60 seconds.