32% of B2B SaaS LinkedIn ad budgets are wasted on audiences that can't buy, GrowthSpree audit finds

B2B SaaS companies are losing nearly one-third of their LinkedIn ad budgets to people who will never sign a contract. GrowthSpree, a paid media and ABM agency that has managed more than $60 million in ad spend across 300-plus companies, published its 2026 B2B SaaS LinkedIn Ads Waste Report on July 16, finding a 32% average waste rate across 56 audited accounts representing $9.4 million in total spend. Of that, $3 million reached audiences with no realistic path to becoming customers, according to the report.

The figure translates to approximately $53,600 in wasted spend per account. More striking is the range: the best-managed quartile of accounts wastes just 13.5% of budget, while the worst wastes 52.4%. That fourfold gap between top and bottom performers points directly at management decisions, not platform limitations.

Where the money goes and why

GrowthSpree's audit identified three root causes that together account for 67% of all waste. Non-ICP job-function targeting is the largest single drain, responsible for $903,000 of the $3 million lost. Seniority mislabeling accounts for another $662,000, and company-size leakage into firms with fewer than 50 employees adds $452,000 more. All three trace to the same structural issue: LinkedIn's default audience configuration casts far too wide a net, and the platform charges full price for every impression delivered outside an advertiser's target profile.

Sales and business development representatives are the largest non-ICP category in job-function spend. That is a telling detail: these are LinkedIn's most active users and among the easiest to reach, but they rarely hold purchasing authority in B2B SaaS. The report found that only 22% of job-function spend currently reaches actual ICP roles, against a recommended target of 60% or more. Decision-makers are receiving less than 33 cents of every dollar allocated to reach them.

Vertical and stage benchmarks operators can use

Waste rates differ materially by vertical and funding stage, giving marketing and demand-gen leaders a concrete benchmark for where their own accounts should land. HR Tech accounts waste the most at 37%, while DevTools accounts perform best at 28%, according to the report. Stage matters even more: Series A accounts average 40% waste, roughly double the 28% seen at growth-equity-stage companies. The correlation suggests that targeting discipline improves as organizations build dedicated demand-gen functions and institutional knowledge around audience exclusions.

The report also draws a comparison between LinkedIn and Google Ads that reframes how performance teams should think about channel efficiency. Google Ads waste, per GrowthSpree's analysis, hides in measurement. LinkedIn Ads waste hides in targeting. That distinction has real implications for attribution and budget allocation: a LinkedIn account reporting strong ROAS may be measuring against a base that already excludes poor-fit spend, or it may be reporting inflated efficiency because waste has not been isolated.

The 90-day recovery framework

GrowthSpree's report closes with a remediation sequence built on one organizing principle: exclusions first, bid adjustments second, budget increases last. Applied retroactively across the full 56-account dataset, the framework cut the average waste rate from 32% to 11.8%, recovered $1.9 million of the $3 million identified as wasted, and lifted decision-maker budget share from 33% to 61%. The agency notes the framework was developed to prove out a baseline before any incremental spend is added.

The sequencing matters operationally. Many paid media teams default to adjusting bids or increasing spend when pipeline targets slip. The GrowthSpree data suggests that approach amplifies waste rather than correcting it: more budget flowing through the same misconfigured targeting simply loses more money faster. Fixing audience exclusions first shrinks the denominator of wasted impressions, which then makes bid and budget decisions meaningful.

GrowthSpree reported that LinkedIn delivers a 121% return on ad spend against Google's 67% in their dataset, but the agency is careful to note that figure only materializes once budget is concentrated on decision-makers. The full report is available free and ungated at GrowthSpree's website.

What this means for your team

• Audit your LinkedIn account's job-function exclusion lists before the next budget cycle. Sales and BD reps showing up as top-reached segments is a red flag, not a targeting success.
• Benchmark your waste rate against the vertical figures in the report: HR Tech at 37%, the overall average at 32%, and DevTools at 28%. Accounts above 40% are likely in the worst-performing quartile.
• Sequence any remediation as exclusions first, then bids, then incremental spend. Adding budget before fixing targeting compounds the waste problem rather than solving it.
• Check decision-maker budget share, not just ROAS. A target of 60% or more of spend reaching actual ICP roles is the threshold GrowthSpree identifies as necessary for LinkedIn's channel efficiency to materialize.