Wasted ad spend in B2B SaaS
About a third. Two audits published in 2026 found average waste of 34.0% across 104 B2B SaaS Google Ads accounts and 32.0% across 56 LinkedIn Ads accounts. The spread matters more than the average. The quarter of Google Ads accounts with the least waste lost 13.2%, and the quarter with the most lost 49.8%, on the same platform with the same tools.
About a third: 34.0% on Google Ads and 32.0% on LinkedIn Ads in two 2026 audits.
13.2%. The best-run quarter of Google Ads accounts wastes that much, on the same platform.
Healthy lead counts. 78% of form fills in audited accounts never became an SQL.
On Google, add negative keywords and store the click ID. On LinkedIn, add audience exclusions.
How much ad spend do B2B SaaS companies waste?
Between 32% and 34% on average in the two audits, with a wide range around it. The table sets them side by side.
| Google Ads | LinkedIn Ads | |
|---|---|---|
| Accounts audited | 104 | 56 |
| Spend analyzed | $78.0M | $9.4M |
| Average waste | 34.0% | 32.0% |
| Total wasted | $26.5M | $3.0M |
| Wasted per account | About $255K a year | About $53.6K |
| Quarter with the least waste | 13.2% | 13.5% |
| Quarter with the most waste | 49.8% | 52.4% |
| Main cause | Missing measurement | Loose audience targeting |
The Google Ads audit covers calendar year 2025. The LinkedIn audit states no calendar period. This site calls the low-waste group the best-run quarter because the Google Ads report describes it that way: daily search-term audits, offline conversions live and the click ID stored in the CRM. The LinkedIn report sums up the difference in one line: "Google waste is largely a measurement problem, while LinkedIn waste is a targeting problem." The full breakdown is in how much ad spend B2B SaaS companies waste.
What counts as wasted spend?
Spend that did not lead to a qualified buyer. The Google Ads report counts spend as wasted when it goes to search queries that never convert, or to form fills that never become a sales-qualified lead (SQL) within 90 days.
That is a judgment, and another analyst could draw the line elsewhere. It is also a stricter test than the ad platform applies. A platform reports a form fill as a conversion. The audit asks what happened to it next, and 78% of form fills in the audited Google Ads accounts never became an SQL.
Zero waste is not a realistic goal. Some spend always goes on finding new queries and audiences, and some of that will not pay.
What does the waste cost in dollars?
It scales with the budget. The table applies the two Google Ads waste rates to four monthly budgets. These figures are arithmetic on the audit's rates and not results from the audit.
| Monthly ad spend | Wasted at the 34.0% average | Wasted at the best-quarter 13.2% | Difference per month |
|---|---|---|---|
| $10,000 | $3,400 | $1,320 | $2,080 |
| $30,000 | $10,200 | $3,960 | $6,240 |
| $75,000 | $25,500 | $9,900 | $15,600 |
| $150,000 | $51,000 | $19,800 | $31,200 |
The last column is the prize. It is budget a company can put back to work without spending more. How that changes a budget plan is on the budget and channel mix page.
How can an account be checked for the main causes?
By looking in six places. Each check maps to a cause the audits ranked, with its share of all waste on that channel.
| Where to look | What to check | Cause it reveals | Share of waste |
|---|---|---|---|
| Google Ads search terms report | Irrelevant queries matched by broad keywords | Broad match without negative keywords | 31% |
| Google Ads conversion settings | Whether any CRM stage is imported as a conversion | Performance Max without offline conversions | 25% |
| A recent lead record in the CRM | Whether it carries a Google click ID | No click ID stored in the CRM | 11% |
| Google Ads bid strategies | Which conversion each strategy is trained on | Smart Bidding trained on form fills | 9% |
| LinkedIn demographics report, by job function | Functions that never buy | Non-buying job functions | 30% |
| LinkedIn demographics report, by seniority and company size | Junior levels and small firms | Seniority mislabeling and company-size leakage | 22% and 15% |
The Google Ads shares are of Google Ads waste and the LinkedIn shares are of LinkedIn waste. The two sets cannot be added together.
Three more Google Ads causes complete that audit's list: what the report calls "default 7-day click attribution" at 15%, mixed brand, competitor and generic campaigns at 5%, and location leakage at 4%. Google Ads Help gives 30 days as the default click-through conversion window, so the window is worth checking in each account.
What should be fixed first?
Measurement on Google Ads and the audience on LinkedIn Ads. Both audits set out a 90-day order of work.
| Phase | Google Ads | LinkedIn Ads |
|---|---|---|
| Days 1 to 7 | Audit the account | Audit who the budget reached |
| Days 8 to 30 | Three shared negative keyword lists, click ID capture, offline conversions | Exclusions for non-buying functions, junior levels and small firms |
| Days 31 to 60 | Conversion values by deal size, then Target CPA and Target ROAS | Bids by seniority tier, dead campaigns and untargeted boosts paused |
| Days 61 to 90 | Performance Max rebuilt by deal-size tier, competitor campaigns split, locations refined | Retargeting funded, industry targeting fixed, offline conversions sent |
The first 30 days carry the most weight. In the Google Ads audit, negative keywords plus click ID capture cut irrelevant spend by about 60% in that period. The steps are in how to reduce wasted ad spend in B2B SaaS Google Ads and how to cut wasted LinkedIn Ads spend. The measurement work is on the conversion tracking and attribution page.
How much of the waste can be recovered?
On Google Ads, most of it. In that audit the 90-day fix took average waste from 34.0% to 11.0% and recovered about $17.9M of the $26.5M. Cost per SQL fell 62%, from $1,267 to $487. The report describes these as observed results across the dataset, not a guarantee for any single account.
The LinkedIn figure is a projection and not a result. The report models a fall from 32.0% to 11.8%, and a rise in the share of budget reaching decision-makers from 33% to 61%.
The two should not be quoted as if they were the same kind of evidence. One was measured. The other is a projection.
Which B2B SaaS companies waste the most?
Broad categories and younger companies, in the Google Ads audit. The report says waste "scales down with operational maturity, not budget size."
| Group | Accounts | Average waste |
|---|---|---|
| AI/ML SaaS | 21 | 39.5% |
| Horizontal SaaS | 29 | 36.0% |
| Fintech SaaS | 17 | 33.0% |
| Healthcare SaaS | 13 | 31.5% |
| Vertical SaaS | 24 | 28.0% |
| Series A | 16 | 42.0% |
| Series B | 34 | 38.0% |
| Series C | 39 | 33.5% |
| Growth equity | 15 | 30.5% |
On AI/ML, the report's explanation is that "broad hype terms pull students, job-seekers, and researchers rather than buyers." On LinkedIn, HR Tech wasted the most at 37%, followed by horizontal SaaS at 35%.
Vertical and stage are two views of the same 104 accounts. They overlap and cannot be added together.
What are the limits of this data?
Four limits apply to every number on this page.
- The samples are not random. Both audits cover accounts their publisher had access to. In the Google Ads audit, 88% of accounts were in the US and annual spend ran from $145K to $3.4M.
- Waste is a judgment. It depends on where the line is drawn between a useful click and a useless one.
- The breakdowns overlap. Cause, quartile, vertical and stage are different views of the same total.
- One recovery figure is modeled. The LinkedIn fall to 11.8% is a projection.
Frequently asked questions
Is a 34% waste rate normal for B2B SaaS Google Ads?
Yes, in the sense that it is the average across 104 audited accounts in the 2026 report. An account near 13% is run about as well as the top quarter. An account near 50% matches the bottom quarter, where the audit found four or more causes present at once.
Do bigger ad budgets waste less?
Not because of size. The Google Ads audit found that waste falls with company stage, from 42.0% at Series A to 30.5% at growth equity, and says it scales with operational maturity and not budget. A large budget with no CRM data wastes more dollars, not fewer.
Why does wasted ad spend go unnoticed?
Because the ad platform reports clicks and form fills, and both can look healthy while pipeline stays flat. In the Google Ads audit, 78% of form fills never reached SQL. Without CRM data flowing back, the account cannot tell a buyer from a non-buyer.
Is Google Ads or LinkedIn Ads more wasteful for B2B SaaS?
They are close: 34.0% and 32.0% in the two 2026 audits. The causes differ. Google Ads waste comes mostly from missing measurement, and LinkedIn Ads waste comes mostly from audience targeting. The fix on one channel does little for the other.
What is a realistic waste rate to aim for?
About 11% to 13% on Google Ads. The best-run quarter of audited accounts sat at 13.2%, and the audited accounts averaged 11.0% after a 90-day fix. Zero is not realistic, because some exploratory spend is always needed to find new queries and audiences.
How often should an account be checked for waste?
The search terms report deserves a look at least weekly. In the 2026 Google Ads audit, the top quarter of accounts was described as running daily search-term audits and the second quarter monthly reviews. That describes the groups. It does not prove the habit caused the lower waste.
Figures on this page come from published studies and platform documentation. Where the numbers come from
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